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 Nephele 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()

Method Summary

Methods

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.
void	invoke() Must be overwritten by the concrete task.
void	registerInputOutput() Must be overwritten by the concrete task to instantiate the required record reader and record writer.
void	setUserCodeClassLoader(ClassLoader cl) Sets the class-loader to be used to load the user code.

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

getCurrentNumberOfSubtasks, getEnvironment, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, setEnvironment, userThreadFinished, userThreadStarted

Methods inherited from class java.lang.Object

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

Constructor Detail

DataSourceTask

public DataSourceTask()

Method Detail

registerInputOutput

public void registerInputOutput()

Description copied from class: AbstractInvokable

Must be overwritten by the concrete task to instantiate the required record reader and record writer.

Specified by:

registerInputOutput in class AbstractInvokable

invoke

public void invoke()
            throws Exception

Description copied from class: AbstractInvokable

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

Specified by:

invoke in class AbstractInvokable

Throws:

Exception

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

setUserCodeClassLoader

public void setUserCodeClassLoader(ClassLoader cl)

Sets the class-loader to be used to load the user code.

Parameters:

cl - The class-loader to be used to load the user code.