org.apache.flink.runtime.operators

Class DataSourceTask<OT>

java.lang.Object

org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

org.apache.flink.runtime.operators.DataSourceTask<OT>

public class DataSourceTask<OT>
extends AbstractInvokable

DataSourceTask which is executed by a task manager. The task reads data and uses an InputFormat to create records from the input.

See Also:

InputFormat

Constructor Summary

Constructors

Constructor and Description
DataSourceTask(Environment environment) Create an Invokable task and set its environment.

Method Summary

Modifier and Type	Method and Description
void	cancel() This method is called when a task is canceled either as a result of a user abort or an execution failure.
DistributedRuntimeUDFContext	createRuntimeContext()
void	invoke() Starts the execution.

Methods inherited from class org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

abortCheckpointOnBarrier, getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, notifyCheckpointComplete, triggerCheckpoint, triggerCheckpointOnBarrier

Methods inherited from class java.lang.Object

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

Constructor Detail

DataSourceTask

public DataSourceTask(Environment environment)

Create an Invokable task and set its environment.

Parameters:

environment - The environment assigned to this invokable.

Method Detail

invoke

public void invoke()
            throws Exception

Description copied from class: AbstractInvokable

Starts the execution.

Must be overwritten by the concrete task implementation. This method is called by the task manager when the actual execution of the task starts.

All resources should be cleaned up when the method returns. Make sure to guard the code with try-finally blocks where necessary.

Specified by:

invoke in class AbstractInvokable

Throws:

Exception - Tasks may forward their exceptions for the TaskManager to handle through failure/recovery.

cancel

public void cancel()
            throws Exception

Description copied from class: AbstractInvokable

This method is called when a task is canceled either as a result of a user abort or an execution failure. It can be overwritten to respond to shut down the user code properly.

Overrides:

cancel in class AbstractInvokable

Throws:

Exception - thrown if any exception occurs during the execution of the user code

createRuntimeContext

public DistributedRuntimeUDFContext createRuntimeContext()