Pipeline Class

This class implements an analysis pipeline. A pipeline consists of a sequence of analysis steps, which can be added one by one. Each added step may or may not depend on one or more previous steps. The pipeline keeps track of the dependencies among these steps and will ensure that all dependencies are met on creation of the pipeline, that is, before the the pipeline is run. Once the pipeline is run, the output is stored in the pipeline along with each step and can be accessed later. Different pipelines can be bound together while preserving all dependencies within each pipeline.

Author

Roman Pahl

Public fields

name: string name of the pipeline
pipeline: data.table the pipeline where each row represents one step.

Methods

Public methods

Pipeline$new()
Pipeline$add()
Pipeline$append()
Pipeline$append_to_step_names()
Pipeline$collect_out()
Pipeline$discard_steps()
Pipeline$get_data()
Pipeline$get_depends()
Pipeline$get_depends_down()
Pipeline$get_depends_up()
Pipeline$get_graph()
Pipeline$get_out()
Pipeline$get_params()
Pipeline$get_params_at_step()
Pipeline$get_params_unique()
Pipeline$get_params_unique_json()
Pipeline$get_step()
Pipeline$get_step_names()
Pipeline$get_step_number()
Pipeline$has_step()
Pipeline$insert_after()
Pipeline$insert_before()
Pipeline$length()
Pipeline$lock_step()
Pipeline$pop_step()
Pipeline$pop_steps_after()
Pipeline$pop_steps_from()
Pipeline$print()
Pipeline$remove_step()
Pipeline$rename_step()
Pipeline$replace_step()
Pipeline$reset()
Pipeline$run()
Pipeline$run_step()
Pipeline$set_data()
Pipeline$set_data_split()
Pipeline$set_keep_out()
Pipeline$set_params()
Pipeline$set_params_at_step()
Pipeline$split()
Pipeline$unlock_step()
Pipeline$clone()

Method `new()`

constructor

Usage

Pipeline$new(name, data = NULL, logger = NULL)

Arguments

name

the name of the Pipeline

data

optional data used at the start of the pipeline. The data also can be set later using the set_data function.

logger

custom logger to be used for logging. If no logger is provided, the default logger is used, which should be sufficient for most use cases. If you do want to use your own custom log function, you need to provide a function that obeys the following form:

function(level, msg, ...) { your custom logging code here }

The level argument is a string and will be one of info, warn, or error. The msg argument is a string containing the message to be logged. The ... argument is a list of named parameters, which can be used to add additional information to the log message. Currently, this is only used to add the context in case of a step giving a warning or error.

Note that with the default logger, the log layout can be altered any time via set_log_layout().

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("myPipe", data = data.frame(x = 1:8))
p

# Passing custom logger
my_logger <- function(level, msg, ...) {
   cat(level, msg, "\n")
}
p <- Pipeline$new("myPipe", logger = my_logger)

Method `add()`

Add pipeline step

Usage

Pipeline$add(
  step,
  fun,
  params = list(),
  description = "",
  group = step,
  keepOut = FALSE
)

Arguments

step: string the name of the step. Each step name must be unique.
fun: function or name of the function to be applied at the step. Both existing and anonymous/lambda functions can be used. All function parameters must have default values. If a parameter is missing a default value in the function signature, alternatively, it can be set via the params argument (see Examples section with mean() function).
params: list list of parameters to set or overwrite parameters of the passed function.
description: string optional description of the step
group: string output collected after pipeline execution (see function collect_out) is grouped by the defined group names. By default, this is the name of the step, which comes in handy when the pipeline is copy-appended multiple times to keep the results of the same function/step grouped at one place.
keepOut: logical if FALSE (default) the output of the step is not collected when calling collect_out after the pipeline run. This option is used to only keep the results that matter and skip intermediate results that are not needed. See also function collect_out for more details.

Returns

returns the Pipeline object invisibly

Examples

# Add steps with lambda functions
p <- Pipeline$new("myPipe", data = 1)
p$add("s1", \(x = ~data) 2*x)  # use input data
p$add("s2", \(x = ~data, y = ~s1) x * y)
try(p$add("s2", \(z = 3) 3)) # error: step 's2' exists already
try(p$add("s3", \(z = ~foo) 3)) # dependency 'foo' not found
p

# Add step with existing function
p <- Pipeline$new("myPipe", data = c(1, 2, NA, 3, 4))
p$add("calc_mean", mean, params = list(x = ~data, na.rm = TRUE))
p$run()$get_out("calc_mean")

# Step description
p <- Pipeline$new("myPipe", data = 1:10)
p$add("s1", \(x = ~data) 2*x, description = "multiply by 2")
print(p)
print(p, verbose = TRUE) # print all columns

# Group output
p <- Pipeline$new("myPipe", data = data.frame(x = 1:5, y = 1:5))
p$add("prep_x", \(data = ~data) data$x, group = "prep")
p$add("prep_y", \(data = ~data) (data$y)^2, group = "prep")
p$add("sum", \(x = ~prep_x, y = ~prep_y) x + y)
p$run()$collect_out(all = TRUE)

Method `append()`

Append another pipeline When appending, pipeflow takes care of potential name clashes with respect to step names and dependencies, that is, if needed, it will automatically adapt step names and dependencies to make sure they are unique in the merged pipeline.

Usage

Pipeline$append(p, outAsIn = FALSE, tryAutofixNames = TRUE, sep = ".")

Arguments

p: Pipeline object to be appended.
outAsIn: logical if TRUE, output of first pipeline is used as input for the second pipeline.
tryAutofixNames: logical if TRUE, name clashes are tried to be automatically resolved by appending the 2nd pipeline's name. Only set to FALSE, if you know what you are doing.
sep: string separator used when auto-resolving step names

Returns

returns new combined Pipeline.

Examples

# Append pipeline
p1 <- Pipeline$new("pipe1")
p1$add("step1", \(x = 1) x)
p2 <- Pipeline$new("pipe2")
p2$add("step2", \(y = 1) y)
p1$append(p2)

# Append pipeline with potential name clashes
p3 <- Pipeline$new("pipe3")
p3$add("step1", \(z = 1) z)
p1$append(p2)$append(p3)

# Use output of first pipeline as input for second pipeline
p1 <- Pipeline$new("pipe1", data = 8)
p2 <- Pipeline$new("pipe2")
p1$add("square", \(x = ~data) x^2)
p2$add("log2", \(x = ~data) log2(x))

p12 <- p1$append(p2, outAsIn = TRUE)
p12$run()$get_out("log2")
p12

# Custom name separator
p1$append(p2, sep = "___")

Method `append_to_step_names()`

Appends string to all step names and takes care of updating step dependencies accordingly.

Usage

Pipeline$append_to_step_names(postfix, sep = ".")

Arguments

postfix: string to be appended to each step name.
sep: string separator between step name and postfix.

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe")
p$add("step1", \(x = 1) x)
p$add("step2", \(y = 1) y)
p$append_to_step_names("new")
p
p$append_to_step_names("foo", sep = "__")
p

Method `collect_out()`

Collect output afer pipeline run, by default, from all steps for which keepOut was set to TRUE. The output is grouped by the group names (see group parameter in function add), which by default are set identical to the step names.

Usage

Pipeline$collect_out(groupBy = "group", all = FALSE)

Arguments

groupBy: string column of pipeline by which to group the output.
all: logical if TRUE all output is collected regardless of the keepOut flag. This can be useful for debugging.

Returns

list containing the output, named after the groups, which, by default, are the steps.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("step1", \(x = ~data) x + 2)
p$add("step2", \(x = ~step1) x + 2, keepOut = TRUE)
p$run()
p$collect_out()
p$collect_out(all = TRUE) |> str()

# Grouped output
p <- Pipeline$new("pipe", data = 1:2)
p$add("step1", \(x = ~data) x + 2, group = "add")
p$add("step2", \(x = ~step1, y = 2) x + y, group = "add")
p$add("step3", \(x = ~data) x * 3, group = "mult")
p$add("step4", \(x = ~data, y = 2) x * y, group = "mult")
p
p$run()
p$collect_out(all = TRUE) |> str()

# Grouped by state
p$set_params(list(y = 5))
p
p$collect_out(groupBy = "state", all = TRUE) |> str()

Method `discard_steps()`

Discard all steps that match a given pattern.

Usage

Pipeline$discard_steps(pattern, recursive = FALSE, fixed = TRUE, ...)

Arguments

pattern: string containing a regular expression (or character string for fixed = TRUE) to be matched.
recursive: logical if TRUE the step is removed together with all its downstream dependencies.
fixed: logical If TRUE, pattern is a string to be matched as is. Overrides all conflicting arguments.
...: further arguments passed to grep().

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~add1) x + 2)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p

p$discard_steps("mult")
p

# Re-add steps
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p
# Discarding 'add1' does not work ...
try(p$discard_steps("add1"))

# ... unless we enforce to remove its downstream dependencies as well
p$discard_steps("add1", recursive = TRUE)   # this works
p

# Trying to discard non-existent steps is just ignored
p$discard_steps("non-existent")

Method `get_data()`

Get data

Usage

Pipeline$get_data()

Returns

the output defined in the data step, which by default is the first step of the pipeline

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$get_data()
p$set_data(3:4)
p$get_data()

Method `get_depends()`

Get all dependencies defined in the pipeline

Usage

Pipeline$get_depends()

Returns

named list of dependencies for each step

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$get_depends()

Method `get_depends_down()`

Get all downstream dependencies of given step, by default descending recursively.

Usage

Pipeline$get_depends_down(step, recursive = TRUE)

Arguments

step: string name of step
recursive: logical if TRUE, dependencies of dependencies are also returned.

Returns

list of downstream dependencies

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p$get_depends_down("add1")
p$get_depends_down("add1", recursive = FALSE)

Method `get_depends_up()`

Get all upstream dependencies of given step, by default descending recursively.

Usage

Pipeline$get_depends_up(step, recursive = TRUE)

Arguments

step: string name of step
recursive: logical if TRUE, dependencies of dependencies are also returned.

Returns

list of upstream dependencies

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p$get_depends_up("mult4")
p$get_depends_up("mult4", recursive = FALSE)

Method `get_graph()`

Visualize the pipeline as a graph.

Usage

Pipeline$get_graph(groups = NULL)

Arguments

groups: character if not NULL, only steps belonging to the given groups are considered.

Returns

two data frames, one for nodes and one for edges ready to be used with the visNetwork package.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p$add("mult1", \(x = ~add1, y = ~add2) x * y)
graph <- pipe_get_graph(p)
graph

if (require("visNetwork", quietly = TRUE)) {
    do.call(visNetwork, args = p$get_graph())
}

Method `get_out()`

Get output of given step

Usage

Pipeline$get_out(step)

Arguments

step: string name of step

Returns

the output at the given step.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$run()
p$get_out("add1")
p$get_out("add2")

Method `get_params()`

Set unbound function parameters defined in the pipeline where 'unbound' means parameters that are not linked to other steps. Trying #' to set parameters that don't exist in the pipeline is ignored, by default, with a warning.

Usage

Pipeline$get_params(ignoreHidden = TRUE)

Arguments

ignoreHidden: logical if TRUE, hidden parameters (i.e. all names starting with a dot) are ignored and thus not returned.

Returns

list of parameters, sorted and named by step. Steps with no parameters are filtered out.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("add3", \() 1 + 2)
p$get_params() |> str()
p$get_params(ignoreHidden = FALSE) |> str()

Method `get_params_at_step()`

Get all unbound (i.e. not referring to other steps) at given step name.

Usage

Pipeline$get_params_at_step(step, ignoreHidden = TRUE)

Arguments

step: string name of step
ignoreHidden: logical if TRUE, hidden parameters (i.e. all names starting with a dot) are ignored and thus not returned.

Returns

list of parameters defined at given step.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("add3", \() 1 + 2)
p$get_params_at_step("add2")
p$get_params_at_step("add2", ignoreHidden = FALSE)
p$get_params_at_step("add3")

Method `get_params_unique()`

Get all unbound (i.e. not referring to other steps) parameters defined in the pipeline, but only list each parameter once. The values of the parameters, will be the values of the first step where the parameter was defined. This is particularly useful after the parameters where set using the set_params function, which will set the same value for all steps.

Usage

Pipeline$get_params_unique(ignoreHidden = TRUE)

Arguments

ignoreHidden: logical if TRUE, hidden parameters (i.e. all names starting with a dot) are ignored and thus not returned.

Returns

list of unique parameters

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("mult1", \(x = 1, y = 2, .z = 3, b = ~add2) x * y * b)
p$get_params_unique()
p$get_params_unique(ignoreHidden = FALSE)

Method `get_params_unique_json()`

Get all unique function parameters in json format.

Usage

Pipeline$get_params_unique_json(ignoreHidden = TRUE)

Arguments

ignoreHidden: logical if TRUE, hidden parameters (i.e. all names starting with a dot) are ignored and thus not returned.

Returns

list flat unnamed json list of unique function parameters

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("mult1", \(x = 1, y = 2, .z = 3, b = ~add2) x * y * b)
p$get_params_unique_json()
p$get_params_unique_json(ignoreHidden = FALSE)

Method `get_step()`

Get step of pipeline

Usage

Pipeline$get_step(step)

Arguments

step: string name of step

Returns

data.table row containing the step.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, z = ~add1) x + y + z)
p$run()
add1 <- p$get_step("add1")
print(add1)
add1[["params"]]
add1[["fun"]]
try()
try(p$get_step("foo")) # error: step 'foo' does not exist

Method `get_step_names()`

Get step names of pipeline

Usage

Pipeline$get_step_names()

Returns

character vector of step names

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$get_step_names()

Method `get_step_number()`

Get step number

Usage

Pipeline$get_step_number(step)

Arguments

step: string name of step

Returns

the step number in the pipeline

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$get_step_number("f2")

Method `has_step()`

Check if pipeline has given step

Usage

Pipeline$has_step(step)

Arguments

step: string name of step

Returns

logical whether step exists

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$has_step("f2")
p$has_step("foo")

Method `insert_after()`

Insert step after a certain step

Usage

Pipeline$insert_after(afterStep, step, ...)

Arguments

afterStep: string name of step after which to insert
step: string name of step to insert
...: further arguments passed to add method of the pipeline

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = 1) x)
p$add("f2", \(x = ~f1) x)
p$insert_after("f1", "f3", \(x = ~f1) x)
p

Method `insert_before()`

Insert step before a certain step

Usage

Pipeline$insert_before(beforeStep, step, ...)

Arguments

beforeStep: string name of step before which to insert
step: string name of step to insert
...: further arguments passed to add method of the pipeline

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = 1) x)
p$add("f2", \(x = ~f1) x)
p$insert_before("f2", "f3", \(x = ~f1) x)
p

Method `length()`

Length of the pipeline aka number of pipeline steps.

Usage

Pipeline$length()

Returns

numeric length of pipeline.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$length()

Method `lock_step()`

Locking a step means that both its parameters and its output (given it has output) are locked such that neither setting new pipeline parameters nor future pipeline runs can change the current parameter and output content.

Usage

Pipeline$lock_step(step)

Arguments

step: string name of step

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = 1, data = ~data) x + data)
p$add("add2", \(x = 1, data = ~data) x + data)
p$run()
p$get_out("add1")
p$get_out("add2")
p$lock_step("add1")

p$set_data(3)
p$set_params(list(x = 3))
p$run()
p$get_out("add1")
p$get_out("add2")

Method `pop_step()`

Drop last step from the pipeline.

Usage

Pipeline$pop_step()

Returns

string the name of the step that was removed

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p
p$pop_step() # "f2"
p

Method `pop_steps_after()`

Drop all steps after the given step.

Usage

Pipeline$pop_steps_after(step)

Arguments

step: string name of step

Returns

character vector of steps that were removed.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$add("f3", \(z = 1) z)
p$pop_steps_after("f1")  # "f2", "f3"
p

Method `pop_steps_from()`

Drop all steps from and including the given step.

Usage

Pipeline$pop_steps_from(step)

Arguments

step: string name of step

Returns

character vector of steps that were removed.

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$add("f3", \(z = 1) z)
p$pop_steps_from("f2")  # "f2", "f3"
p

Method `print()`

Print the pipeline as a table.

Usage

Pipeline$print(verbose = FALSE)

Arguments

verbose: logical if TRUE, print all columns of the pipeline, otherwise only the most relevant columns are displayed.

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$print()

Method `remove_step()`

Remove certain step from the pipeline. If other steps depend on the step to be removed, an error is given and the removal is blocked, unless recursive was set to TRUE.

Usage

Pipeline$remove_step(step, recursive = FALSE)

Arguments

step: string the name of the step to be removed.
recursive: logical if TRUE the step is removed together with all its downstream dependencies.

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p$add("mult1", \(x = 1, y = ~add2) x * y)
p$remove_step("mult1")
p
try(p$remove_step("add1"))  # fails because "add2" depends on "add1"
p$remove_step("add1", recursive = TRUE)  # removes "add1" and "add2"
p

Method `rename_step()`

Safely rename a step in the pipeline. If new step name would result in a name clash, an error is given.

Usage

Pipeline$rename_step(from, to)

Arguments

from: string the name of the step to be renamed.
to: string the new name of the step.

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p
try(p$rename_step("add1", "add2"))  # fails because "add2" exists
p$rename_step("add1", "first_add")  # Ok
p

Method `replace_step()`

Replaces an existing pipeline step.

Usage

Pipeline$replace_step(
  step,
  fun,
  params = list(),
  description = "",
  group = step,
  keepOut = FALSE
)

Arguments

step: string the name of the step to be replaced. Step must exist.
fun: string or function operation to be applied at the step. Both existing and lambda/anonymous functions can be used.
params: list list of parameters to overwrite default parameters of existing functions.
description: string optional description of the step
group: string grouping information (by default the same as the name of the step. Any output collected later (see function collect_out by default is put together by these group names. This, for example, comes in handy when the pipeline is copy-appended multiple times to keep the results of the same function/step at one place.
keepOut: logical if FALSE the output of the function will be cleaned at the end of the whole pipeline execution. This option is used to only keep the results that matter.

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~data, y = 2) x + y)
p$add("mult", \(x = 1, y = 2) x * y, keepOut = TRUE)
p$run()$collect_out()
p$replace_step("mult", \(x = ~add1, y = ~add2) x * y, keepOut = TRUE)
p$run()$collect_out()
try(p$replace_step("foo", \(x = 1) x))   # step 'foo' does not exist

Method `reset()`

Resets the pipeline to the state before it was run. This means that all output is removed and the state of all steps is reset to 'New'.

Usage

Pipeline$reset()

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$run()
p
p$reset()
p

Method `run()`

Run all new and/or outdated pipeline steps.

Usage

Pipeline$run(
  force = FALSE,
  recursive = TRUE,
  cleanUnkept = FALSE,
  progress = NULL,
  showLog = TRUE
)

Arguments

force: logical if TRUE all steps are run regardless of whether they are outdated or not.
recursive: logical if TRUE and a step returns a new pipeline, the run of the current pipeline is aborted and the new pipeline is run recursively.
cleanUnkept: logical if TRUE all output that was not marked to be kept is removed after the pipeline run. This option can be useful if temporary results require a lot of memory.
progress: function this parameter can be used to provide a custom progress function of the form function(value, detail), which will show the progress of the pipeline run for each step, where value is the current step number and detail is the name of the step.
showLog: logical should the steps be logged during the pipeline run?

Returns

returns the Pipeline object invisibly

Examples

# Simple pipeline
p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~add1, z = 2) x + z)
p$add("final", \(x = ~add1, y = ~add2) x * y, keepOut = TRUE)
p$run()$collect_out()
p$set_params(list(z = 4))  # outdates steps add2 and final
p
p$run()$collect_out()
p$run(cleanUnkept = TRUE)  # clean up temporary results
p

# Recursive pipeline
p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("new_pipe", \(x = ~add1) {
    pp <- Pipeline$new("new_pipe", data = x)
    pp$add("add1", \(x = ~data) x + 1)
    pp$add("add2", \(x = ~add1) x + 2, keepOut = TRUE)
    }
)
p$run(recursive = TRUE)$collect_out()

# Run pipeline with progress bar
p <- Pipeline$new("pipe", data = 1)
p$add("first step", \() Sys.sleep(1))
p$add("second step", \() Sys.sleep(1))
p$add("last step", \() Sys.sleep(1))
pb <- txtProgressBar(min = 1, max = p$length(), style = 3)
fprogress <- function(value, detail) {
   setTxtProgressBar(pb, value)
}
p$run(progress = fprogress, showLog = FALSE)

Method `run_step()`

Run given pipeline step possibly together with upstream and downstream dependencies.

Usage

Pipeline$run_step(
  step,
  upstream = TRUE,
  downstream = FALSE,
  cleanUnkept = FALSE
)

Arguments

step: string name of step
upstream: logical if TRUE, run all dependent upstream steps first.
downstream: logical if TRUE, run all depdendent downstream afterwards.
cleanUnkept: logical if TRUE all output that was not marked to be kept is removed after the pipeline run. This option can be useful if temporary results require a lot of memory.

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~add1, z = 2) x + z)
p$add("mult", \(x = ~add1, y = ~add2) x * y)
p$run_step("add2")
p$run_step("add2", downstream = TRUE)
p$run_step("mult", upstream = TRUE)

Method `set_data()`

Set data in first step of pipeline.

Usage

Pipeline$set_data(data)

Arguments

data: initial data set

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y, keepOut = TRUE)
p$run()$collect_out()
p$set_data(3)
p$run()$collect_out()

Method `set_data_split()`

This function can be used to apply the pipeline repeatedly to various data sets. For this, the pipeline split-copies itself by the list of given data sets. Each sub-pipeline will have one of the data sets set as input data. The step names of the sub-pipelines will be the original step names plus the name of the data set.

Usage

Pipeline$set_data_split(
  dataList,
  toStep = character(),
  groupBySplit = TRUE,
  sep = "."
)

Arguments

dataList: list of data sets
toStep: string step name marking optional subset of the pipeline, at which the data split should be applied to.
groupBySplit: logical whether to set step groups according to data split.
sep: string separator to be used between step name and data set name when creating the new step names.

Returns

new combined Pipeline with each sub-pipeline having set one of the data sets.

Examples

# Split by three data sets
dataList <- list(a = 1, b = 2, c = 3)
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
p$set_data_split(dataList)
p
p$run()$collect_out() |> str()

# Don't group output by split
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
p$set_data_split(dataList, groupBySplit = FALSE)
p
p$run()$collect_out() |> str()

# Split up to certain step
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1)
p$add("mult", \(x = ~data, y = ~add1) x * y)
p$add("average_result", \(x = ~mult) mean(unlist(x)), keepOut = TRUE)
p
p$get_depends()[["average_result"]]

p$set_data_split(dataList, toStep = "mult")
p
p$get_depends()[["average_result"]]

p$run()$collect_out()

Method `set_keep_out()`

Change the keepOut flag at a given pipeline step, which determines whether the output of that step is collected when calling collect_out() after the pipeline was run.

Usage

Pipeline$set_keep_out(step, keepOut = TRUE)

Arguments

step: string name of step
keepOut: logical whether to keep output of step

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y, keepOut = TRUE)
p$add("add2", \(x = ~data, y = 2) x + y)
p$add("mult", \(x = ~add1, y = ~add2) x * y)
p$run()$collect_out()
p$set_keep_out("add1", keepOut = FALSE)
p$set_keep_out("mult", keepOut = TRUE)
p$collect_out()

Method `set_params()`

Set parameters in the pipeline. If a parameter occurs in several steps, the parameter is set commonly in all steps. Trying to set parameters that don't exist in the pipeline is ignored, by default, with a warning.

Usage

Pipeline$set_params(params, warnUndefined = TRUE)

Arguments

params: list of parameters to be set
warnUndefined: logical whether to give a warning when trying to set a parameter that is not defined in the pipeline.

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 2) x + y)
p$add("add2", \(x = ~data, y = 3) x + y)
p$add("mult", \(x = 4, z = 5) x * z)
p$get_params()
p$set_params(list(x = 3, y = 3))
p$get_params()
p$set_params(list(x = 5, z = 3))
p$get_params()
suppressWarnings(
    p$set_params(list(foo = 3)) # gives warning as 'foo' is undefined
)
p$set_params(list(foo = 3), warnUndefined = FALSE)

Method `set_params_at_step()`

Set unbound function parameters defined at given pipeline step where 'unbound' means parameters that are not linked to other steps.

Usage

Pipeline$set_params_at_step(step, params)

Arguments

step: string the name of the step
params: list of parameters to be set

Returns

returns the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 2, z = 3) x + y)
p$set_params_at_step("add1", list(y = 5, z = 6))
p$get_params()
try(p$set_params_at_step("add1", list(foo = 3))) # foo not defined

Method `split()`

Splits pipeline into its independent parts.

Usage

Pipeline$split()

Returns

list of Pipeline objects

Examples

# Example for two independent calculation paths
p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = ~data) x)
p$add("f2", \(x = 1) x)
p$add("f3", \(x = ~f1) x)
p$add("f4", \(x = ~f2) x)
p$split()

# Example of split by three data sets
dataList <- list(a = 1, b = 2, c = 3)
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
pipes <- p$set_data_split(dataList)$split()
pipes

Method `unlock_step()`

Unlock previously locked step. If step was not locked, the command is ignored.

Usage

Pipeline$unlock_step(step)

Arguments

step: string name of step

Returns

the Pipeline object invisibly

Examples

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = 1, data = ~data) x + data)
p$add("add2", \(x = 1, data = ~data) x + data)
p$lock_step("add1")
p$set_params(list(x = 3))
p$get_params()
p$unlock_step("add1")
p$set_params(list(x = 3))
p$get_params()

Method `clone()`

The objects of this class are cloneable with this method.

Usage

Pipeline$clone(deep = FALSE)

Arguments

deep: Whether to make a deep clone.

Examples


## ------------------------------------------------
## Method `Pipeline$new`
## ------------------------------------------------

p <- Pipeline$new("myPipe", data = data.frame(x = 1:8))
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New

# Passing custom logger
my_logger <- function(level, msg, ...) {
   cat(level, msg, "\n")
}
p <- Pipeline$new("myPipe", logger = my_logger)

## ------------------------------------------------
## Method `Pipeline$add`
## ------------------------------------------------

# Add steps with lambda functions
p <- Pipeline$new("myPipe", data = 1)
p$add("s1", \(x = ~data) 2*x)  # use input data
p$add("s2", \(x = ~data, y = ~s1) x * y)
try(p$add("s2", \(z = 3) 3)) # error: step 's2' exists already
#> Error : step 's2' already exists
try(p$add("s3", \(z = ~foo) 3)) # dependency 'foo' not found
#> Error : step 's3': dependency 'foo' not found
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     s1    data [NULL]   FALSE     s1    New
#> 3:     s2 data,s1 [NULL]   FALSE     s2    New

# Add step with existing function
p <- Pipeline$new("myPipe", data = c(1, 2, NA, 3, 4))
p$add("calc_mean", mean, params = list(x = ~data, na.rm = TRUE))
p$run()$get_out("calc_mean")
#> INFO  [2025-07-27 10:39:58.103] Start run of 'myPipe' pipeline:
#> INFO  [2025-07-27 10:39:58.132] Step 1/2 data
#> INFO  [2025-07-27 10:39:58.141] Step 2/2 calc_mean
#> INFO  [2025-07-27 10:39:58.165] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.166] Done.
#> [1] 2.5

# Step description
p <- Pipeline$new("myPipe", data = 1:10)
p$add("s1", \(x = ~data) 2*x, description = "multiply by 2")
print(p)
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     s1    data [NULL]   FALSE     s1    New
print(p, verbose = TRUE) # print all columns
#>      step           fun funcName    params depends    out keepOut  group
#>    <char>        <list>   <char>    <list>  <list> <list>  <lgcl> <char>
#> 1:   data <function[1]> function <list[0]>         [NULL]   FALSE   data
#> 2:     s1 <function[1]> function <list[1]>    data [NULL]   FALSE     s1
#>      description                time  state
#>           <char>              <POSc> <char>
#> 1:               2025-07-27 10:39:58    New
#> 2: multiply by 2 2025-07-27 10:39:58    New

# Group output
p <- Pipeline$new("myPipe", data = data.frame(x = 1:5, y = 1:5))
p$add("prep_x", \(data = ~data) data$x, group = "prep")
p$add("prep_y", \(data = ~data) (data$y)^2, group = "prep")
p$add("sum", \(x = ~prep_x, y = ~prep_y) x + y)
p$run()$collect_out(all = TRUE)
#> INFO  [2025-07-27 10:39:58.180] Start run of 'myPipe' pipeline:
#> INFO  [2025-07-27 10:39:58.181] Step 1/4 data
#> INFO  [2025-07-27 10:39:58.184] Step 2/4 prep_x
#> INFO  [2025-07-27 10:39:58.186] Step 3/4 prep_y
#> INFO  [2025-07-27 10:39:58.188] Step 4/4 sum
#> INFO  [2025-07-27 10:39:58.189] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.190] Done.
#> $data
#>   x y
#> 1 1 1
#> 2 2 2
#> 3 3 3
#> 4 4 4
#> 5 5 5
#> 
#> $prep
#> $prep$prep_x
#> [1] 1 2 3 4 5
#> 
#> $prep$prep_y
#> [1]  1  4  9 16 25
#> 
#> 
#> $sum
#> [1]  2  6 12 20 30
#> 

## ------------------------------------------------
## Method `Pipeline$append`
## ------------------------------------------------

# Append pipeline
p1 <- Pipeline$new("pipe1")
p1$add("step1", \(x = 1) x)
p2 <- Pipeline$new("pipe2")
p2$add("step2", \(y = 1) y)
p1$append(p2)
#>          step depends    out keepOut  group  state
#>        <char>  <list> <list>  <lgcl> <char> <char>
#> 1:       data         [NULL]   FALSE   data    New
#> 2:      step1         [NULL]   FALSE  step1    New
#> 3: data.pipe2         [NULL]   FALSE   data    New
#> 4:      step2         [NULL]   FALSE  step2    New

# Append pipeline with potential name clashes
p3 <- Pipeline$new("pipe3")
p3$add("step1", \(z = 1) z)
p1$append(p2)$append(p3)
#>           step depends    out keepOut  group  state
#>         <char>  <list> <list>  <lgcl> <char> <char>
#> 1:        data         [NULL]   FALSE   data    New
#> 2:       step1         [NULL]   FALSE  step1    New
#> 3:  data.pipe2         [NULL]   FALSE   data    New
#> 4:       step2         [NULL]   FALSE  step2    New
#> 5:  data.pipe3         [NULL]   FALSE   data    New
#> 6: step1.pipe3         [NULL]   FALSE  step1    New

# Use output of first pipeline as input for second pipeline
p1 <- Pipeline$new("pipe1", data = 8)
p2 <- Pipeline$new("pipe2")
p1$add("square", \(x = ~data) x^2)
p2$add("log2", \(x = ~data) log2(x))

p12 <- p1$append(p2, outAsIn = TRUE)
p12$run()$get_out("log2")
#> INFO  [2025-07-27 10:39:58.330] Start run of 'pipe1.pipe2' pipeline:
#> INFO  [2025-07-27 10:39:58.331] Step 1/4 data
#> INFO  [2025-07-27 10:39:58.333] Step 2/4 square
#> INFO  [2025-07-27 10:39:58.336] Step 3/4 data.pipe2
#> INFO  [2025-07-27 10:39:58.338] Step 4/4 log2
#> INFO  [2025-07-27 10:39:58.339] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.339] Done.
#> [1] 6
p12
#>          step    depends    out keepOut      group  state
#>        <char>     <list> <list>  <lgcl>     <char> <char>
#> 1:       data                 8   FALSE       data   Done
#> 2:     square       data     64   FALSE     square   Done
#> 3: data.pipe2     square     64   FALSE data.pipe2   Done
#> 4:       log2 data.pipe2      6   FALSE       log2   Done

# Custom name separator
p1$append(p2, sep = "___")
#>            step      depends    out keepOut  group  state
#>          <char>       <list> <list>  <lgcl> <char> <char>
#> 1:         data              [NULL]   FALSE   data    New
#> 2:       square         data [NULL]   FALSE square    New
#> 3: data___pipe2              [NULL]   FALSE   data    New
#> 4:         log2 data___pipe2 [NULL]   FALSE   log2    New

## ------------------------------------------------
## Method `Pipeline$append_to_step_names`
## ------------------------------------------------

p <- Pipeline$new("pipe")
p$add("step1", \(x = 1) x)
p$add("step2", \(y = 1) y)
p$append_to_step_names("new")
p
#>         step depends    out keepOut  group  state
#>       <char>  <list> <list>  <lgcl> <char> <char>
#> 1:  data.new         [NULL]   FALSE   data    New
#> 2: step1.new         [NULL]   FALSE  step1    New
#> 3: step2.new         [NULL]   FALSE  step2    New
p$append_to_step_names("foo", sep = "__")
p
#>              step depends    out keepOut  group  state
#>            <char>  <list> <list>  <lgcl> <char> <char>
#> 1:  data.new__foo         [NULL]   FALSE   data    New
#> 2: step1.new__foo         [NULL]   FALSE  step1    New
#> 3: step2.new__foo         [NULL]   FALSE  step2    New

## ------------------------------------------------
## Method `Pipeline$collect_out`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("step1", \(x = ~data) x + 2)
p$add("step2", \(x = ~step1) x + 2, keepOut = TRUE)
p$run()
#> INFO  [2025-07-27 10:39:58.361] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.362] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.364] Step 2/3 step1
#> INFO  [2025-07-27 10:39:58.366] Step 3/3 step2
#> INFO  [2025-07-27 10:39:58.368] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.368] Done.
p$collect_out()
#> $step2
#> [1] 5 6
#> 
p$collect_out(all = TRUE) |> str()
#> List of 3
#>  $ data : int [1:2] 1 2
#>  $ step1: num [1:2] 3 4
#>  $ step2: num [1:2] 5 6

# Grouped output
p <- Pipeline$new("pipe", data = 1:2)
p$add("step1", \(x = ~data) x + 2, group = "add")
p$add("step2", \(x = ~step1, y = 2) x + y, group = "add")
p$add("step3", \(x = ~data) x * 3, group = "mult")
p$add("step4", \(x = ~data, y = 2) x * y, group = "mult")
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:  step1    data [NULL]   FALSE    add    New
#> 3:  step2   step1 [NULL]   FALSE    add    New
#> 4:  step3    data [NULL]   FALSE   mult    New
#> 5:  step4    data [NULL]   FALSE   mult    New
p$run()
#> INFO  [2025-07-27 10:39:58.399] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.400] Step 1/5 data
#> INFO  [2025-07-27 10:39:58.403] Step 2/5 step1
#> INFO  [2025-07-27 10:39:58.405] Step 3/5 step2
#> INFO  [2025-07-27 10:39:58.407] Step 4/5 step3
#> INFO  [2025-07-27 10:39:58.408] Step 5/5 step4
#> INFO  [2025-07-27 10:39:58.410] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.410] Done.
p$collect_out(all = TRUE) |> str()
#> List of 3
#>  $ data: int [1:2] 1 2
#>  $ add :List of 2
#>   ..$ step1: num [1:2] 3 4
#>   ..$ step2: num [1:2] 5 6
#>  $ mult:List of 2
#>   ..$ step3: num [1:2] 3 6
#>   ..$ step4: num [1:2] 2 4

# Grouped by state
p$set_params(list(y = 5))
p
#>      step depends    out keepOut  group    state
#>    <char>  <list> <list>  <lgcl> <char>   <char>
#> 1:   data            1,2   FALSE   data     Done
#> 2:  step1    data    3,4   FALSE    add     Done
#> 3:  step2   step1    5,6   FALSE    add Outdated
#> 4:  step3    data    3,6   FALSE   mult     Done
#> 5:  step4    data    2,4   FALSE   mult Outdated
p$collect_out(groupBy = "state", all = TRUE) |> str()
#> List of 2
#>  $ Done    :List of 3
#>   ..$ data : int [1:2] 1 2
#>   ..$ step1: num [1:2] 3 4
#>   ..$ step3: num [1:2] 3 6
#>  $ Outdated:List of 2
#>   ..$ step2: num [1:2] 5 6
#>   ..$ step4: num [1:2] 2 4

## ------------------------------------------------
## Method `Pipeline$discard_steps`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~add1) x + 2)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:   add1    data [NULL]   FALSE   add1    New
#> 3:   add2    add1 [NULL]   FALSE   add2    New
#> 4:  mult3    add1 [NULL]   FALSE  mult3    New
#> 5:  mult4    add2 [NULL]   FALSE  mult4    New

p$discard_steps("mult")
#> step 'mult4' was removed
#> step 'mult3' was removed
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:   add1    data [NULL]   FALSE   add1    New
#> 3:   add2    add1 [NULL]   FALSE   add2    New

# Re-add steps
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:   add1    data [NULL]   FALSE   add1    New
#> 3:   add2    add1 [NULL]   FALSE   add2    New
#> 4:  mult3    add1 [NULL]   FALSE  mult3    New
#> 5:  mult4    add2 [NULL]   FALSE  mult4    New
# Discarding 'add1' does not work ...
try(p$discard_steps("add1"))
#> Error : cannot remove step 'add1' because the following steps depend on it: 'add2', 'mult3'

# ... unless we enforce to remove its downstream dependencies as well
p$discard_steps("add1", recursive = TRUE)   # this works
#> Removing step 'add1' and its downstream dependencies: 'add2', 'mult3', 'mult4'
#> step 'add1' was removed
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New

# Trying to discard non-existent steps is just ignored
p$discard_steps("non-existent")

## ------------------------------------------------
## Method `Pipeline$get_data`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$get_data()
#> [1] 1 2
p$set_data(3:4)
p$get_data()
#> [1] 3 4

## ------------------------------------------------
## Method `Pipeline$get_depends`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$get_depends()
#> $data
#> character(0)
#> 
#> $add1
#>      x 
#> "data" 
#> 
#> $add2
#>      x      y 
#> "data" "add1" 
#> 

## ------------------------------------------------
## Method `Pipeline$get_depends_down`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p$get_depends_down("add1")
#> [1] "add2"  "mult3" "mult4"
p$get_depends_down("add1", recursive = FALSE)
#> [1] "add2"  "mult3"

## ------------------------------------------------
## Method `Pipeline$get_depends_up`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$add("mult3", \(x = ~add1) x * 3)
p$add("mult4", \(x = ~add2) x * 4)
p$get_depends_up("mult4")
#> [1] "data" "add1" "add2"
p$get_depends_up("mult4", recursive = FALSE)
#> [1] "add2"

## ------------------------------------------------
## Method `Pipeline$get_graph`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p$add("mult1", \(x = ~add1, y = ~add2) x * y)
graph <- pipe_get_graph(p)
graph
#> $nodes
#>   id label group    shape     color   title
#> 1  1  data  data database lightblue <p></p>
#> 2  2  add1  add1      box lightblue <p></p>
#> 3  3  add2  add2      box lightblue <p></p>
#> 4  4 mult1 mult1      box lightblue <p></p>
#> 
#> $edges
#>         from to arrows
#> add1       1  2     to
#> add2       2  3     to
#> mult1.x    2  4     to
#> mult1.y    3  4     to
#> 

if (require("visNetwork", quietly = TRUE)) {
    do.call(visNetwork, args = p$get_graph())
}


## ------------------------------------------------
## Method `Pipeline$get_out`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(x = ~data) x + 1)
p$add("add2", \(x = ~data, y = ~add1) x + y)
p$run()
#> INFO  [2025-07-27 10:39:58.561] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.562] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.564] Step 2/3 add1
#> INFO  [2025-07-27 10:39:58.566] Step 3/3 add2
#> INFO  [2025-07-27 10:39:58.567] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.568] Done.
p$get_out("add1")
#> [1] 2 3
p$get_out("add2")
#> [1] 3 5

## ------------------------------------------------
## Method `Pipeline$get_params`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("add3", \() 1 + 2)
p$get_params() |> str()
#> List of 2
#>  $ add1:List of 1
#>   ..$ x: num 1
#>  $ add2:List of 2
#>   ..$ x: num 1
#>   ..$ y: num 2
p$get_params(ignoreHidden = FALSE) |> str()
#> List of 2
#>  $ add1:List of 1
#>   ..$ x: num 1
#>  $ add2:List of 3
#>   ..$ x : num 1
#>   ..$ y : num 2
#>   ..$ .z: num 3

## ------------------------------------------------
## Method `Pipeline$get_params_at_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("add3", \() 1 + 2)
p$get_params_at_step("add2")
#> $x
#> [1] 1
#> 
#> $y
#> [1] 2
#> 
p$get_params_at_step("add2", ignoreHidden = FALSE)
#> $x
#> [1] 1
#> 
#> $y
#> [1] 2
#> 
#> $.z
#> [1] 3
#> 
p$get_params_at_step("add3")
#> list()

## ------------------------------------------------
## Method `Pipeline$get_params_unique`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("mult1", \(x = 1, y = 2, .z = 3, b = ~add2) x * y * b)
p$get_params_unique()
#> $x
#> [1] 1
#> 
#> $y
#> [1] 2
#> 
p$get_params_unique(ignoreHidden = FALSE)
#> $x
#> [1] 1
#> 
#> $y
#> [1] 2
#> 
#> $.z
#> [1] 3
#> 

## ------------------------------------------------
## Method `Pipeline$get_params_unique_json`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, .z = 3) x + y + .z)
p$add("mult1", \(x = 1, y = 2, .z = 3, b = ~add2) x * y * b)
p$get_params_unique_json()
#> [
#>   {
#>     "name": "x",
#>     "value": 1
#>   },
#>   {
#>     "name": "y",
#>     "value": 2
#>   }
#> ] 
p$get_params_unique_json(ignoreHidden = FALSE)
#> [
#>   {
#>     "name": "x",
#>     "value": 1
#>   },
#>   {
#>     "name": "y",
#>     "value": 2
#>   },
#>   {
#>     "name": ".z",
#>     "value": 3
#>   }
#> ] 

## ------------------------------------------------
## Method `Pipeline$get_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = 2, z = ~add1) x + y + z)
p$run()
#> INFO  [2025-07-27 10:39:58.613] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.614] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.616] Step 2/3 add1
#> INFO  [2025-07-27 10:39:58.618] Step 3/3 add2
#> INFO  [2025-07-27 10:39:58.619] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.620] Done.
add1 <- p$get_step("add1")
print(add1)
#>      step           fun funcName    params depends    out keepOut  group
#>    <char>        <list>   <char>    <list>  <list> <list>  <lgcl> <char>
#> 1:   add1 <function[1]> function <list[2]>    data    2,3   FALSE   add1
#>    description                time  state
#>         <char>              <POSc> <char>
#> 1:             2025-07-27 10:39:58   Done
add1[["params"]]
#> [[1]]
#> [[1]]$data
#> ~data
#> <environment: 0x0000021756367378>
#> 
#> [[1]]$x
#> [1] 1
#> 
#> 
add1[["fun"]]
#> [[1]]
#> function (data = ~data, x = 1) 
#> x + data
#> <environment: 0x0000021758e224e0>
#> 
try()
#> Error in try() : argument "expr" is missing, with no default
try(p$get_step("foo")) # error: step 'foo' does not exist
#> Error : step 'foo' does not exist

## ------------------------------------------------
## Method `Pipeline$get_step_names`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$get_step_names()
#> [1] "data" "f1"   "f2"  

## ------------------------------------------------
## Method `Pipeline$get_step_number`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$get_step_number("f2")
#> [1] 3

## ------------------------------------------------
## Method `Pipeline$has_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$has_step("f2")
#> [1] TRUE
p$has_step("foo")
#> [1] FALSE

## ------------------------------------------------
## Method `Pipeline$insert_after`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = 1) x)
p$add("f2", \(x = ~f1) x)
p$insert_after("f1", "f3", \(x = ~f1) x)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New
#> 3:     f3      f1 [NULL]   FALSE     f3    New
#> 4:     f2      f1 [NULL]   FALSE     f2    New

## ------------------------------------------------
## Method `Pipeline$insert_before`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = 1) x)
p$add("f2", \(x = ~f1) x)
p$insert_before("f2", "f3", \(x = ~f1) x)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New
#> 3:     f3      f1 [NULL]   FALSE     f3    New
#> 4:     f2      f1 [NULL]   FALSE     f2    New

## ------------------------------------------------
## Method `Pipeline$length`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$length()
#> [1] 3

## ------------------------------------------------
## Method `Pipeline$lock_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = 1, data = ~data) x + data)
p$add("add2", \(x = 1, data = ~data) x + data)
p$run()
#> INFO  [2025-07-27 10:39:58.663] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.664] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.666] Step 2/3 add1
#> INFO  [2025-07-27 10:39:58.668] Step 3/3 add2
#> INFO  [2025-07-27 10:39:58.669] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.669] Done.
p$get_out("add1")
#> [1] 2
p$get_out("add2")
#> [1] 2
p$lock_step("add1")

p$set_data(3)
p$set_params(list(x = 3))
#> skipping setting parameters x at locked step 'add1'
p$run()
#> INFO  [2025-07-27 10:39:58.691] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.692] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.694] Step 2/3 add1 - skip 'locked' step
#> INFO  [2025-07-27 10:39:58.695] Step 3/3 add2
#> INFO  [2025-07-27 10:39:58.696] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.697] Done.
p$get_out("add1")
#> [1] 2
p$get_out("add2")
#> [1] 6

## ------------------------------------------------
## Method `Pipeline$pop_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New
#> 3:     f2         [NULL]   FALSE     f2    New
p$pop_step() # "f2"
#> [1] "f2"
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New

## ------------------------------------------------
## Method `Pipeline$pop_steps_after`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$add("f3", \(z = 1) z)
p$pop_steps_after("f1")  # "f2", "f3"
#> [1] "f2" "f3"
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New

## ------------------------------------------------
## Method `Pipeline$pop_steps_from`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$add("f3", \(z = 1) z)
p$pop_steps_from("f2")  # "f2", "f3"
#> [1] "f2" "f3"
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New

## ------------------------------------------------
## Method `Pipeline$print`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$print()
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New
#> 3:     f2         [NULL]   FALSE     f2    New

## ------------------------------------------------
## Method `Pipeline$remove_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p$add("mult1", \(x = 1, y = ~add2) x * y)
p$remove_step("mult1")
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:   add1    data [NULL]   FALSE   add1    New
#> 3:   add2    add1 [NULL]   FALSE   add2    New
try(p$remove_step("add1"))  # fails because "add2" depends on "add1"
#> Error : cannot remove step 'add1' because the following steps depend on it: 'add2'
p$remove_step("add1", recursive = TRUE)  # removes "add1" and "add2"
#> Removing step 'add1' and its downstream dependencies: 'add2'
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New

## ------------------------------------------------
## Method `Pipeline$rename_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("add1", \(data = ~data, x = 1) x + data)
p$add("add2", \(x = 1, y = ~add1) x + y)
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:   add1    data [NULL]   FALSE   add1    New
#> 3:   add2    add1 [NULL]   FALSE   add2    New
try(p$rename_step("add1", "add2"))  # fails because "add2" exists
#> Error : step 'add2' already exists
p$rename_step("add1", "first_add")  # Ok
p
#>         step   depends    out keepOut  group  state
#>       <char>    <list> <list>  <lgcl> <char> <char>
#> 1:      data           [NULL]   FALSE   data    New
#> 2: first_add      data [NULL]   FALSE   add1    New
#> 3:      add2 first_add [NULL]   FALSE   add2    New

## ------------------------------------------------
## Method `Pipeline$replace_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~data, y = 2) x + y)
p$add("mult", \(x = 1, y = 2) x * y, keepOut = TRUE)
p$run()$collect_out()
#> INFO  [2025-07-27 10:39:58.753] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.754] Step 1/4 data
#> INFO  [2025-07-27 10:39:58.759] Step 2/4 add1
#> INFO  [2025-07-27 10:39:58.761] Step 3/4 add2
#> INFO  [2025-07-27 10:39:58.763] Step 4/4 mult
#> INFO  [2025-07-27 10:39:58.764] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.765] Done.
#> $mult
#> [1] 2
#> 
p$replace_step("mult", \(x = ~add1, y = ~add2) x * y, keepOut = TRUE)
p$run()$collect_out()
#> INFO  [2025-07-27 10:39:58.768] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.768] Step 1/4 data - skip 'done' step
#> INFO  [2025-07-27 10:39:58.769] Step 2/4 add1 - skip 'done' step
#> INFO  [2025-07-27 10:39:58.770] Step 3/4 add2 - skip 'done' step
#> INFO  [2025-07-27 10:39:58.771] Step 4/4 mult
#> INFO  [2025-07-27 10:39:58.772] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.773] Done.
#> $mult
#> [1] 6
#> 
try(p$replace_step("foo", \(x = 1) x))   # step 'foo' does not exist
#> Error : step 'foo' does not exist

## ------------------------------------------------
## Method `Pipeline$reset`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1:2)
p$add("f1", \(x = 1) x)
p$add("f2", \(y = 1) y)
p$run()
#> INFO  [2025-07-27 10:39:58.790] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.791] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.792] Step 2/3 f1
#> INFO  [2025-07-27 10:39:58.794] Step 3/3 f2
#> INFO  [2025-07-27 10:39:58.795] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.795] Done.
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data            1,2   FALSE   data   Done
#> 2:     f1              1   FALSE     f1   Done
#> 3:     f2              1   FALSE     f2   Done
p$reset()
p
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1         [NULL]   FALSE     f1    New
#> 3:     f2         [NULL]   FALSE     f2    New

## ------------------------------------------------
## Method `Pipeline$run`
## ------------------------------------------------

# Simple pipeline
p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~add1, z = 2) x + z)
p$add("final", \(x = ~add1, y = ~add2) x * y, keepOut = TRUE)
p$run()$collect_out()
#> INFO  [2025-07-27 10:39:58.806] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.807] Step 1/4 data
#> INFO  [2025-07-27 10:39:58.810] Step 2/4 add1
#> INFO  [2025-07-27 10:39:58.812] Step 3/4 add2
#> INFO  [2025-07-27 10:39:58.814] Step 4/4 final
#> INFO  [2025-07-27 10:39:58.815] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.816] Done.
#> $final
#> [1] 8
#> 
p$set_params(list(z = 4))  # outdates steps add2 and final
p
#>      step   depends    out keepOut  group    state
#>    <char>    <list> <list>  <lgcl> <char>   <char>
#> 1:   data                1   FALSE   data     Done
#> 2:   add1      data      2   FALSE   add1     Done
#> 3:   add2      add1      4   FALSE   add2 Outdated
#> 4:  final add1,add2      8    TRUE  final Outdated
p$run()$collect_out()
#> INFO  [2025-07-27 10:39:58.823] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.824] Step 1/4 data - skip 'done' step
#> INFO  [2025-07-27 10:39:58.825] Step 2/4 add1 - skip 'done' step
#> INFO  [2025-07-27 10:39:58.826] Step 3/4 add2
#> INFO  [2025-07-27 10:39:58.828] Step 4/4 final
#> INFO  [2025-07-27 10:39:58.829] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.829] Done.
#> $final
#> [1] 12
#> 
p$run(cleanUnkept = TRUE)  # clean up temporary results
#> INFO  [2025-07-27 10:39:58.831] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.832] Step 1/4 data - skip 'done' step
#> INFO  [2025-07-27 10:39:58.833] Step 2/4 add1 - skip 'done' step
#> INFO  [2025-07-27 10:39:58.834] Step 3/4 add2 - skip 'done' step
#> INFO  [2025-07-27 10:39:58.834] Step 4/4 final - skip 'done' step
#> INFO  [2025-07-27 10:39:58.835] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.836] Clean temporary results.
#> INFO  [2025-07-27 10:39:58.836] Done.
p
#>      step   depends    out keepOut  group    state
#>    <char>    <list> <list>  <lgcl> <char>   <char>
#> 1:   data           [NULL]   FALSE   data Outdated
#> 2:   add1      data [NULL]   FALSE   add1 Outdated
#> 3:   add2      add1 [NULL]   FALSE   add2 Outdated
#> 4:  final add1,add2     12    TRUE  final     Done

# Recursive pipeline
p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("new_pipe", \(x = ~add1) {
    pp <- Pipeline$new("new_pipe", data = x)
    pp$add("add1", \(x = ~data) x + 1)
    pp$add("add2", \(x = ~add1) x + 2, keepOut = TRUE)
    }
)
p$run(recursive = TRUE)$collect_out()
#> INFO  [2025-07-27 10:39:58.843] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.844] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.847] Step 2/3 add1
#> INFO  [2025-07-27 10:39:58.849] Step 3/3 new_pipe
#> INFO  [2025-07-27 10:39:58.852] Abort pipeline execution and restart on new.
#> INFO  [2025-07-27 10:39:58.852] Start run of 'new_pipe' pipeline:
#> INFO  [2025-07-27 10:39:58.853] Step 1/3 data
#> INFO  [2025-07-27 10:39:58.855] Step 2/3 add1
#> INFO  [2025-07-27 10:39:58.857] Step 3/3 add2
#> INFO  [2025-07-27 10:39:58.858] Finished execution of steps.
#> INFO  [2025-07-27 10:39:58.859] Done.
#> $add2
#> [1] 5
#> 

# Run pipeline with progress bar
p <- Pipeline$new("pipe", data = 1)
p$add("first step", \() Sys.sleep(1))
p$add("second step", \() Sys.sleep(1))
p$add("last step", \() Sys.sleep(1))
pb <- txtProgressBar(min = 1, max = p$length(), style = 3)
fprogress <- function(value, detail) {
   setTxtProgressBar(pb, value)
}
p$run(progress = fprogress, showLog = FALSE)
#> 
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## ------------------------------------------------
## Method `Pipeline$run_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y)
p$add("add2", \(x = ~add1, z = 2) x + z)
p$add("mult", \(x = ~add1, y = ~add2) x * y)
p$run_step("add2")
#> INFO  [2025-07-27 10:40:01.949] Start step run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:01.950] Step 1/3 data (upstream)
#> INFO  [2025-07-27 10:40:01.952] Step 2/3 add1 (upstream)
#> INFO  [2025-07-27 10:40:01.954] Step 3/3 add2
#> INFO  [2025-07-27 10:40:01.956] Finished execution of steps.
#> INFO  [2025-07-27 10:40:01.956] Done.
p$run_step("add2", downstream = TRUE)
#> INFO  [2025-07-27 10:40:01.971] Start step run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:01.971] Step 1/4 data (upstream)
#> INFO  [2025-07-27 10:40:01.974] Step 2/4 add1 (upstream)
#> INFO  [2025-07-27 10:40:01.976] Step 3/4 add2
#> INFO  [2025-07-27 10:40:01.978] Step 4/4 mult (downstream)
#> INFO  [2025-07-27 10:40:01.979] Finished execution of steps.
#> INFO  [2025-07-27 10:40:01.979] Done.
p$run_step("mult", upstream = TRUE)
#> INFO  [2025-07-27 10:40:01.984] Start step run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:01.984] Step 1/4 data (upstream)
#> INFO  [2025-07-27 10:40:01.987] Step 2/4 add1 (upstream)
#> INFO  [2025-07-27 10:40:01.989] Step 3/4 add2 (upstream)
#> INFO  [2025-07-27 10:40:01.991] Step 4/4 mult
#> INFO  [2025-07-27 10:40:01.992] Finished execution of steps.
#> INFO  [2025-07-27 10:40:01.992] Done.

## ------------------------------------------------
## Method `Pipeline$set_data`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y, keepOut = TRUE)
p$run()$collect_out()
#> INFO  [2025-07-27 10:40:01.996] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:01.997] Step 1/2 data
#> INFO  [2025-07-27 10:40:01.999] Step 2/2 add1
#> INFO  [2025-07-27 10:40:02.000] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.001] Done.
#> $add1
#> [1] 2
#> 
p$set_data(3)
p$run()$collect_out()
#> INFO  [2025-07-27 10:40:02.004] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:02.005] Step 1/2 data
#> INFO  [2025-07-27 10:40:02.007] Step 2/2 add1
#> INFO  [2025-07-27 10:40:02.008] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.008] Done.
#> $add1
#> [1] 4
#> 

## ------------------------------------------------
## Method `Pipeline$set_data_split`
## ------------------------------------------------

# Split by three data sets
dataList <- list(a = 1, b = 2, c = 3)
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
p$set_data_split(dataList)
p
#>      step       depends    out keepOut  group    state
#>    <char>        <list> <list>  <lgcl> <char>   <char>
#> 1: data.a               [NULL]   FALSE      a      New
#> 2: add1.a        data.a [NULL]    TRUE      a Outdated
#> 3: mult.a data.a,add1.a [NULL]    TRUE      a Outdated
#> 4: data.b               [NULL]   FALSE      b      New
#> 5: add1.b        data.b [NULL]    TRUE      b Outdated
#> 6: mult.b data.b,add1.b [NULL]    TRUE      b Outdated
#> 7: data.c               [NULL]   FALSE      c      New
#> 8: add1.c        data.c [NULL]    TRUE      c Outdated
#> 9: mult.c data.c,add1.c [NULL]    TRUE      c Outdated
p$run()$collect_out() |> str()
#> INFO  [2025-07-27 10:40:02.032] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:02.033] Step 1/9 data.a
#> INFO  [2025-07-27 10:40:02.035] Step 2/9 add1.a
#> INFO  [2025-07-27 10:40:02.037] Step 3/9 mult.a
#> INFO  [2025-07-27 10:40:02.039] Step 4/9 data.b
#> INFO  [2025-07-27 10:40:02.041] Step 5/9 add1.b
#> INFO  [2025-07-27 10:40:02.043] Step 6/9 mult.b
#> INFO  [2025-07-27 10:40:02.045] Step 7/9 data.c
#> INFO  [2025-07-27 10:40:02.047] Step 8/9 add1.c
#> INFO  [2025-07-27 10:40:02.049] Step 9/9 mult.c
#> INFO  [2025-07-27 10:40:02.050] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.051] Done.
#> List of 3
#>  $ a:List of 2
#>   ..$ add1.a: num 2
#>   ..$ mult.a: num 2
#>  $ b:List of 2
#>   ..$ add1.b: num 3
#>   ..$ mult.b: num 6
#>  $ c:List of 2
#>   ..$ add1.c: num 4
#>   ..$ mult.c: num 12

# Don't group output by split
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
p$set_data_split(dataList, groupBySplit = FALSE)
p
#>      step       depends    out keepOut  group    state
#>    <char>        <list> <list>  <lgcl> <char>   <char>
#> 1: data.a               [NULL]   FALSE data.a      New
#> 2: add1.a        data.a [NULL]    TRUE add1.a Outdated
#> 3: mult.a data.a,add1.a [NULL]    TRUE mult.a Outdated
#> 4: data.b               [NULL]   FALSE data.b      New
#> 5: add1.b        data.b [NULL]    TRUE add1.b Outdated
#> 6: mult.b data.b,add1.b [NULL]    TRUE mult.b Outdated
#> 7: data.c               [NULL]   FALSE data.c      New
#> 8: add1.c        data.c [NULL]    TRUE add1.c Outdated
#> 9: mult.c data.c,add1.c [NULL]    TRUE mult.c Outdated
p$run()$collect_out() |> str()
#> INFO  [2025-07-27 10:40:02.078] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:02.079] Step 1/9 data.a
#> INFO  [2025-07-27 10:40:02.082] Step 2/9 add1.a
#> INFO  [2025-07-27 10:40:02.084] Step 3/9 mult.a
#> INFO  [2025-07-27 10:40:02.085] Step 4/9 data.b
#> INFO  [2025-07-27 10:40:02.088] Step 5/9 add1.b
#> INFO  [2025-07-27 10:40:02.089] Step 6/9 mult.b
#> INFO  [2025-07-27 10:40:02.091] Step 7/9 data.c
#> INFO  [2025-07-27 10:40:02.093] Step 8/9 add1.c
#> INFO  [2025-07-27 10:40:02.095] Step 9/9 mult.c
#> INFO  [2025-07-27 10:40:02.097] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.097] Done.
#> List of 6
#>  $ add1.a: num 2
#>  $ mult.a: num 2
#>  $ add1.b: num 3
#>  $ mult.b: num 6
#>  $ add1.c: num 4
#>  $ mult.c: num 12

# Split up to certain step
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1)
p$add("mult", \(x = ~data, y = ~add1) x * y)
p$add("average_result", \(x = ~mult) mean(unlist(x)), keepOut = TRUE)
p
#>              step   depends    out keepOut          group  state
#>            <char>    <list> <list>  <lgcl>         <char> <char>
#> 1:           data           [NULL]   FALSE           data    New
#> 2:           add1      data [NULL]   FALSE           add1    New
#> 3:           mult data,add1 [NULL]   FALSE           mult    New
#> 4: average_result      mult [NULL]    TRUE average_result    New
p$get_depends()[["average_result"]]
#>      x 
#> "mult" 

p$set_data_split(dataList, toStep = "mult")
p
#>               step       depends    out keepOut          group    state
#>             <char>        <list> <list>  <lgcl>         <char>   <char>
#>  1:         data.a               [NULL]   FALSE              a      New
#>  2:         add1.a        data.a [NULL]   FALSE              a Outdated
#>  3:         mult.a data.a,add1.a [NULL]   FALSE              a Outdated
#>  4:         data.b               [NULL]   FALSE              b      New
#>  5:         add1.b        data.b [NULL]   FALSE              b Outdated
#>  6:         mult.b data.b,add1.b [NULL]   FALSE              b Outdated
#>  7:         data.c               [NULL]   FALSE              c      New
#>  8:         add1.c        data.c [NULL]   FALSE              c Outdated
#>  9:         mult.c data.c,add1.c [NULL]   FALSE              c Outdated
#> 10: average_result     <list[1]> [NULL]    TRUE average_result      New
p$get_depends()[["average_result"]]
#> $x
#> [1] "mult.a" "mult.b" "mult.c"
#> 

p$run()$collect_out()
#> INFO  [2025-07-27 10:40:02.131] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:02.132] Step 1/10 data.a
#> INFO  [2025-07-27 10:40:02.137] Step 2/10 add1.a
#> INFO  [2025-07-27 10:40:02.139] Step 3/10 mult.a
#> INFO  [2025-07-27 10:40:02.141] Step 4/10 data.b
#> INFO  [2025-07-27 10:40:02.143] Step 5/10 add1.b
#> INFO  [2025-07-27 10:40:02.145] Step 6/10 mult.b
#> INFO  [2025-07-27 10:40:02.147] Step 7/10 data.c
#> INFO  [2025-07-27 10:40:02.149] Step 8/10 add1.c
#> INFO  [2025-07-27 10:40:02.152] Step 9/10 mult.c
#> INFO  [2025-07-27 10:40:02.154] Step 10/10 average_result
#> INFO  [2025-07-27 10:40:02.155] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.155] Done.
#> $average_result
#> [1] 6.666667
#> 

## ------------------------------------------------
## Method `Pipeline$set_keep_out`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 1) x + y, keepOut = TRUE)
p$add("add2", \(x = ~data, y = 2) x + y)
p$add("mult", \(x = ~add1, y = ~add2) x * y)
p$run()$collect_out()
#> INFO  [2025-07-27 10:40:02.162] Start run of 'pipe' pipeline:
#> INFO  [2025-07-27 10:40:02.163] Step 1/4 data
#> INFO  [2025-07-27 10:40:02.165] Step 2/4 add1
#> INFO  [2025-07-27 10:40:02.167] Step 3/4 add2
#> INFO  [2025-07-27 10:40:02.169] Step 4/4 mult
#> INFO  [2025-07-27 10:40:02.170] Finished execution of steps.
#> INFO  [2025-07-27 10:40:02.170] Done.
#> $add1
#> [1] 2
#> 
p$set_keep_out("add1", keepOut = FALSE)
p$set_keep_out("mult", keepOut = TRUE)
p$collect_out()
#> $mult
#> [1] 6
#> 

## ------------------------------------------------
## Method `Pipeline$set_params`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 2) x + y)
p$add("add2", \(x = ~data, y = 3) x + y)
p$add("mult", \(x = 4, z = 5) x * z)
p$get_params()
#> $add1
#> $add1$y
#> [1] 2
#> 
#> 
#> $add2
#> $add2$y
#> [1] 3
#> 
#> 
#> $mult
#> $mult$x
#> [1] 4
#> 
#> $mult$z
#> [1] 5
#> 
#> 
p$set_params(list(x = 3, y = 3))
p$get_params()
#> $add1
#> $add1$y
#> [1] 3
#> 
#> 
#> $add2
#> $add2$y
#> [1] 3
#> 
#> 
#> $mult
#> $mult$x
#> [1] 3
#> 
#> $mult$z
#> [1] 5
#> 
#> 
p$set_params(list(x = 5, z = 3))
p$get_params()
#> $add1
#> $add1$y
#> [1] 3
#> 
#> 
#> $add2
#> $add2$y
#> [1] 3
#> 
#> 
#> $mult
#> $mult$x
#> [1] 5
#> 
#> $mult$z
#> [1] 3
#> 
#> 
suppressWarnings(
    p$set_params(list(foo = 3)) # gives warning as 'foo' is undefined
)
p$set_params(list(foo = 3), warnUndefined = FALSE)

## ------------------------------------------------
## Method `Pipeline$set_params_at_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = ~data, y = 2, z = 3) x + y)
p$set_params_at_step("add1", list(y = 5, z = 6))
p$get_params()
#> $add1
#> $add1$y
#> [1] 5
#> 
#> $add1$z
#> [1] 6
#> 
#> 
try(p$set_params_at_step("add1", list(foo = 3))) # foo not defined
#> Error : Unable to set parameter(s) foo at step add1 - candidates are y, z

## ------------------------------------------------
## Method `Pipeline$split`
## ------------------------------------------------

# Example for two independent calculation paths
p <- Pipeline$new("pipe", data = 1)
p$add("f1", \(x = ~data) x)
p$add("f2", \(x = 1) x)
p$add("f3", \(x = ~f1) x)
p$add("f4", \(x = ~f2) x)
p$split()
#> [[1]]
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:   data         [NULL]   FALSE   data    New
#> 2:     f1    data [NULL]   FALSE     f1    New
#> 3:     f3      f1 [NULL]   FALSE     f3    New
#> 
#> [[2]]
#>      step depends    out keepOut  group  state
#>    <char>  <list> <list>  <lgcl> <char> <char>
#> 1:     f2         [NULL]   FALSE     f2    New
#> 2:     f4      f2 [NULL]   FALSE     f4    New
#> 

# Example of split by three data sets
dataList <- list(a = 1, b = 2, c = 3)
p <- Pipeline$new("pipe")
p$add("add1", \(x = ~data) x + 1, keepOut = TRUE)
p$add("mult", \(x = ~data, y = ~add1) x * y, keepOut = TRUE)
pipes <- p$set_data_split(dataList)$split()
pipes
#> [[1]]
#>      step       depends    out keepOut  group    state
#>    <char>        <list> <list>  <lgcl> <char>   <char>
#> 1: data.a               [NULL]   FALSE      a      New
#> 2: add1.a        data.a [NULL]    TRUE      a Outdated
#> 3: mult.a data.a,add1.a [NULL]    TRUE      a Outdated
#> 
#> [[2]]
#>      step       depends    out keepOut  group    state
#>    <char>        <list> <list>  <lgcl> <char>   <char>
#> 1: data.b               [NULL]   FALSE      b      New
#> 2: add1.b        data.b [NULL]    TRUE      b Outdated
#> 3: mult.b data.b,add1.b [NULL]    TRUE      b Outdated
#> 
#> [[3]]
#>      step       depends    out keepOut  group    state
#>    <char>        <list> <list>  <lgcl> <char>   <char>
#> 1: data.c               [NULL]   FALSE      c      New
#> 2: add1.c        data.c [NULL]    TRUE      c Outdated
#> 3: mult.c data.c,add1.c [NULL]    TRUE      c Outdated
#> 

## ------------------------------------------------
## Method `Pipeline$unlock_step`
## ------------------------------------------------

p <- Pipeline$new("pipe", data = 1)
p$add("add1", \(x = 1, data = ~data) x + data)
p$add("add2", \(x = 1, data = ~data) x + data)
p$lock_step("add1")
p$set_params(list(x = 3))
#> skipping setting parameters x at locked step 'add1'
p$get_params()
#> $add1
#> $add1$x
#> [1] 1
#> 
#> 
#> $add2
#> $add2$x
#> [1] 3
#> 
#> 
p$unlock_step("add1")
p$set_params(list(x = 3))
p$get_params()
#> $add1
#> $add1$x
#> [1] 3
#> 
#> 
#> $add2
#> $add2$x
#> [1] 3
#> 
#>

Author

Public fields

Methods

Public methods

Method new()

Usage

Arguments

Returns

Examples

Method add()

Usage

Arguments

Returns

Examples

Method append()

Usage

Arguments

Returns

Examples

Method append_to_step_names()

Usage

Arguments

Returns

Examples

Method collect_out()

Usage

Arguments

Returns

Examples

Method discard_steps()

Usage

Arguments

Returns

Examples

Method get_data()

Usage

Returns

Examples

Method get_depends()

Usage

Returns

Examples

Method get_depends_down()

Usage

Arguments

Returns

Examples

Method get_depends_up()

Usage

Arguments

Returns

Examples

Method get_graph()

Usage

Arguments

Returns

Examples

Method get_out()

Usage

Arguments

Returns

Examples

Method get_params()

Usage

Arguments

Returns

Examples

Method get_params_at_step()

Usage

Arguments

Returns

Examples

Method get_params_unique()

Usage

Arguments

Returns

Examples

Method get_params_unique_json()

Usage

Method `new()`

Method `add()`

Method `append()`

Method `append_to_step_names()`

Method `collect_out()`

Method `discard_steps()`

Method `get_data()`

Method `get_depends()`

Method `get_depends_down()`

Method `get_depends_up()`

Method `get_graph()`

Method `get_out()`

Method `get_params()`

Method `get_params_at_step()`

Method `get_params_unique()`

Method `get_params_unique_json()`

Method `get_step()`

Method `get_step_names()`

Method `get_step_number()`

Method `has_step()`

Method `insert_after()`

Method `insert_before()`

Method `length()`

Method `lock_step()`

Method `pop_step()`

Method `pop_steps_after()`

Method `pop_steps_from()`

Method `print()`

Method `remove_step()`

Method `rename_step()`