org.apache.flink.streaming.runtime.tasks

Class StreamTask<OUT,O extends StreamOperator<OUT>>

java.lang.Object

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

org.apache.flink.streaming.runtime.tasks.StreamTask<OUT,O>

All Implemented Interfaces:

org.apache.flink.runtime.jobgraph.tasks.CheckpointCommittingOperator, org.apache.flink.runtime.jobgraph.tasks.CheckpointedOperator, org.apache.flink.runtime.jobgraph.tasks.OperatorStateCarrier<org.apache.flink.runtime.state.StateHandle<Serializable>>

Direct Known Subclasses:

OneInputStreamTask, SourceStreamTask, TwoInputStreamTask

public abstract class StreamTask<OUT,O extends StreamOperator<OUT>>
extends org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable
implements org.apache.flink.runtime.jobgraph.tasks.OperatorStateCarrier<org.apache.flink.runtime.state.StateHandle<Serializable>>, org.apache.flink.runtime.jobgraph.tasks.CheckpointedOperator, org.apache.flink.runtime.jobgraph.tasks.CheckpointCommittingOperator

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	checkpointLock
protected StreamConfig	configuration
protected List<StreamingRuntimeContext>	contexts
protected boolean	hasChainedOperators
protected boolean	isRunning
protected OutputHandler<OUT>	outputHandler
protected O	streamOperator
protected ClassLoader	userClassLoader

Constructor Summary

Constructors

Constructor and Description
StreamTask()

Method Summary

Modifier and Type	Method and Description
void	cancel()
protected void	clearBuffers()
protected void	closeOperator()
void	confirmCheckpoint(long checkpointId, long timestamp)
StreamingRuntimeContext	createRuntimeContext(StreamConfig conf)
String	getName()
org.apache.flink.runtime.util.event.EventListener<org.apache.flink.runtime.event.task.TaskEvent>	getSuperstepListener()
protected void	openOperator()
void	registerInputOutput()
void	setInitialState(org.apache.flink.runtime.state.StateHandle<Serializable> stateHandle)
String	toString()
void	triggerCheckpoint(long checkpointId, long timestamp)

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

getCurrentNumberOfSubtasks, getEnvironment, getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getTaskConfiguration, getUserCodeClassLoader, invoke, setEnvironment

Methods inherited from class java.lang.Object

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

Field Detail

checkpointLock

protected final Object checkpointLock

configuration

protected StreamConfig configuration

outputHandler

protected OutputHandler<OUT> outputHandler

streamOperator

protected O extends StreamOperator<OUT> streamOperator

hasChainedOperators

protected boolean hasChainedOperators

isRunning

protected volatile boolean isRunning

contexts

protected List<StreamingRuntimeContext> contexts

userClassLoader

protected ClassLoader userClassLoader

Constructor Detail

StreamTask

public StreamTask()

Method Detail

registerInputOutput

public void registerInputOutput()

Specified by:

registerInputOutput in class org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

getName

public String getName()

createRuntimeContext

public StreamingRuntimeContext createRuntimeContext(StreamConfig conf)

openOperator

protected void openOperator()
                     throws Exception

Throws:

Exception

closeOperator

protected void closeOperator()
                      throws Exception

Throws:

Exception

clearBuffers

protected void clearBuffers()
                     throws IOException

Throws:

IOException

cancel

public void cancel()

Overrides:

cancel in class org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable

getSuperstepListener

public org.apache.flink.runtime.util.event.EventListener<org.apache.flink.runtime.event.task.TaskEvent> getSuperstepListener()

setInitialState

public void setInitialState(org.apache.flink.runtime.state.StateHandle<Serializable> stateHandle)
                     throws Exception

Specified by:

setInitialState in interface org.apache.flink.runtime.jobgraph.tasks.OperatorStateCarrier<org.apache.flink.runtime.state.StateHandle<Serializable>>

Throws:

Exception

triggerCheckpoint

public void triggerCheckpoint(long checkpointId,
                              long timestamp)
                       throws Exception

Specified by:

triggerCheckpoint in interface org.apache.flink.runtime.jobgraph.tasks.CheckpointedOperator

Throws:

Exception

confirmCheckpoint

public void confirmCheckpoint(long checkpointId,
                              long timestamp)
                       throws Exception

Specified by:

confirmCheckpoint in interface org.apache.flink.runtime.jobgraph.tasks.CheckpointCommittingOperator

Throws:

Exception

toString

public String toString()

Overrides:

toString in class Object