Package io.kestra.core.tasks.flows

Class Dag

java.lang.Object

io.kestra.core.models.tasks.Task

io.kestra.core.tasks.flows.Dag

All Implemented Interfaces:

FlowableTask<VoidOutput>

@Plugin(examples=@Example(title="Run a series of tasks for which the execution order is defined by their upstream dependencies.",code="tasks:\n  - task:\n      id: task1\n      type: io.kestra.core.tasks.log.Log\n      message: task 1\n  - task:\n      id: task2\n      type: io.kestra.core.tasks.log.Log\n      message: task 2\n    dependsOn:\n      - task1\n  - task:\n      id: task3\n      type: io.kestra.core.tasks.log.Log\n      message: task 3\n    dependsOn:\n      - task1\n  - task:\n      id: task4\n      type: io.kestra.core.tasks.log.Log\n      message: task 4\n    dependsOn:\n      - task2\n  - task:\n      id: task5\n      type: io.kestra.core.tasks.log.Log\n      message: task 5\n    dependsOn:\n      - task4\n      - task3\n"))
public class Dag
extends Task
implements FlowableTask<VoidOutput>

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Dag.DagTask

Field Summary

Fields

Modifier and Type	Field	Description
protected @Valid List<Task>	errors

Fields inherited from class io.kestra.core.models.tasks.Task

disabled, id, retry, timeout, type

Constructor Summary

Constructors

Constructor	Description
Dag()

Method Summary

Modifier and Type	Method	Description
List<Task>	allChildTasks()
List<ResolvedTask>	childTasks(RunContext runContext, TaskRun parentTaskRun)	Resolve child tasks of a flowable task.
ArrayList<String>	dagCheckCyclicDependencies(List<Dag.DagTask> taskDepends)
List<String>	dagCheckNotExistTask(List<Dag.DagTask> taskDepends)
List<NextTaskRun>	resolveNexts(RunContext runContext, Execution execution, TaskRun parentTaskRun)	Resolve next tasks to run for an execution.
GraphCluster	tasksTree(Execution execution, TaskRun taskRun, List<String> parentValues)	Create the topology representation of a flowable task.

Methods inherited from class io.kestra.core.models.tasks.Task

findById, findById, isFlowable, isSendToWorkerTask

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.kestra.core.models.tasks.FlowableTask

getErrors, outputs, resolveState

Field Details

errors

@Valid
@PluginProperty
protected @Valid List<Task> errors

Constructor Details

Dag

public Dag()

Method Details

tasksTree

public GraphCluster tasksTree(Execution execution,
 TaskRun taskRun,
 List<String> parentValues)
                       throws IllegalVariableEvaluationException

Description copied from interface: FlowableTask

Create the topology representation of a flowable task.

A flowable task always contains subtask to it returns a cluster that displays the subtasks.

Specified by:

tasksTree in interface FlowableTask<VoidOutput>

Throws:

IllegalVariableEvaluationException

allChildTasks

public List<Task> allChildTasks()

Specified by:

allChildTasks in interface FlowableTask<VoidOutput>

Returns:

all child tasks including errors

childTasks

public List<ResolvedTask> childTasks(RunContext runContext,
 TaskRun parentTaskRun)
                              throws IllegalVariableEvaluationException

Description copied from interface: FlowableTask

Resolve child tasks of a flowable task.

For a normal flowable, it should be the list of its tasks, for an iterative flowable (such as EachSequential, ForEachItem, ...), it should be the list of its tasks for all iterations.

Specified by:

childTasks in interface FlowableTask<VoidOutput>

Throws:

IllegalVariableEvaluationException

resolveNexts

public List<NextTaskRun> resolveNexts(RunContext runContext,
 Execution execution,
 TaskRun parentTaskRun)
                               throws IllegalVariableEvaluationException

Description copied from interface: FlowableTask

Resolve next tasks to run for an execution.

For a normal flowable, it should be the subsequent task, for a parallel flowable (such as Parallel, ForEachItem, ...), it should be a list of the next subsequent tasks of the size of the concurrency of the task.

Specified by:

resolveNexts in interface FlowableTask<VoidOutput>

Throws:

IllegalVariableEvaluationException

dagCheckNotExistTask

public List<String> dagCheckNotExistTask(List<Dag.DagTask> taskDepends)

dagCheckCyclicDependencies

public ArrayList<String> dagCheckCyclicDependencies(List<Dag.DagTask> taskDepends)