org.apache.flink.streaming.runtime.tasks

类 SourceStreamTask<OUT,SRC extends SourceFunction<OUT>,OP extends StreamSource<OUT,SRC>>

java.lang.Object

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

org.apache.flink.streaming.runtime.tasks.SourceStreamTask<OUT,SRC,OP>

类型参数:

OUT - Type of the output elements of this source.

SRC - Type of the source function for the stream source operator

OP - Type of the stream source operator

所有已实现的接口:

org.apache.flink.runtime.jobgraph.tasks.CheckpointableTask, org.apache.flink.runtime.jobgraph.tasks.CoordinatedTask, org.apache.flink.runtime.jobgraph.tasks.TaskInvokable, AsyncExceptionHandler, ContainingTaskDetails

@Internal
public class SourceStreamTask<OUT,SRC extends SourceFunction<OUT>,OP extends StreamSource<OUT,SRC>>
extends StreamTask<OUT,OP>

StreamTask for executing a StreamSource.

One important aspect of this is that the checkpointing and the emission of elements must never occur at the same time. The execution must be serial. This is achieved by having the contract with the SourceFunction that it must only modify its state or emit elements in a synchronized block that locks on the lock Object. Also, the modification of the state and the emission of elements must happen in the same block of code that is protected by the synchronized block.

字段概要

从类继承的字段 org.apache.flink.streaming.runtime.tasks.StreamTask

checkpointStorage, configuration, inputProcessor, LOG, mailboxProcessor, mainOperator, operatorChain, stateBackend, systemTimerService, timerService, TRIGGER_THREAD_GROUP

构造器概要

构造器

构造器和说明
SourceStreamTask(org.apache.flink.runtime.execution.Environment env)

方法概要

限定符和类型	方法和说明
protected void	advanceToEndOfEventTime() Emits the MAX_WATERMARK so that all registered timers are fired.
protected void	cancelTask()
protected void	cleanUpInternal()
protected void	declineCheckpoint(long checkpointId)
protected void	finishTask() Instructs the task to go through its normal termination routine, i.e. exit the run-loop and call StreamOperator.finish() and StreamOperator.close() on its operators.
protected CompletableFuture<Void>	getCompletionFuture()
protected void	init()
protected void	processInput(MailboxDefaultAction.Controller controller) This method implements the default action of the task (e.g. processing one event from the input).
CompletableFuture<Boolean>	triggerCheckpointAsync(org.apache.flink.runtime.checkpoint.CheckpointMetaData checkpointMetaData, org.apache.flink.runtime.checkpoint.CheckpointOptions checkpointOptions)

从类继承的方法 org.apache.flink.streaming.runtime.tasks.StreamTask

abortCheckpointOnBarrier, afterInvoke, assertTriggeringCheckpointExceptions, cancel, cleanUp, createRecordWriterDelegate, createStreamTaskStateInitializer, dispatchOperatorEvent, endData, finalize, getAsyncCheckpointStartDelayNanos, getAsyncOperationsThreadPool, getCancelables, getCheckpointBarrierHandler, getCheckpointStorage, getConfiguration, getEnvironment, getMailboxExecutorFactory, getName, getProcessingTimeServiceFactory, handleAsyncException, invoke, isCanceled, isFailing, isMailboxLoopRunning, isRunning, isUsingNonBlockingInput, maybeInterruptOnCancel, notifyCheckpointAbortAsync, notifyCheckpointCompleteAsync, restore, runMailboxLoop, runMailboxStep, setSynchronousSavepoint, setupNumRecordsInCounter, toString, triggerCheckpointOnBarrier

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.streaming.runtime.tasks.ContainingTaskDetails

getExecutionConfig, getIndexInSubtaskGroup, getJobConfiguration, getUserCodeClassLoader

构造器详细资料

SourceStreamTask

public SourceStreamTask(org.apache.flink.runtime.execution.Environment env)
                 throws Exception

抛出:

Exception

方法详细资料

init

protected void init()

指定者:

init 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

advanceToEndOfEventTime

protected void advanceToEndOfEventTime()
                                throws Exception

从类复制的说明: StreamTask

Emits the MAX_WATERMARK so that all registered timers are fired.

This is used by the source task when the job is TERMINATED. In the case, we want all the timers registered throughout the pipeline to fire and the related state (e.g. windows) to be flushed.

For tasks other than the source task, this method does nothing.

覆盖:

advanceToEndOfEventTime 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

抛出:

Exception

cleanUpInternal

protected void cleanUpInternal()

覆盖:

cleanUpInternal 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

processInput

protected void processInput(MailboxDefaultAction.Controller controller)
                     throws Exception

从类复制的说明: StreamTask

This method implements the default action of the task (e.g. processing one event from the input). Implementations should (in general) be non-blocking.

覆盖:

processInput 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

参数:

controller - controller object for collaborative interaction between the action and the stream task.

抛出:

Exception - on any problems in the action.

cancelTask

protected void cancelTask()

覆盖:

cancelTask 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

finishTask

protected void finishTask()

从类复制的说明: StreamTask

Instructs the task to go through its normal termination routine, i.e. exit the run-loop and call StreamOperator.finish() and StreamOperator.close() on its operators.

This is used by the source task to get out of the run-loop when the job is stopped with a savepoint.

For tasks other than the source task, this method does nothing.

覆盖:

finishTask 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

getCompletionFuture

protected CompletableFuture<Void> getCompletionFuture()

覆盖:

getCompletionFuture 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

triggerCheckpointAsync

public CompletableFuture<Boolean> triggerCheckpointAsync(org.apache.flink.runtime.checkpoint.CheckpointMetaData checkpointMetaData,
                                                         org.apache.flink.runtime.checkpoint.CheckpointOptions checkpointOptions)

指定者:

triggerCheckpointAsync 在接口中 org.apache.flink.runtime.jobgraph.tasks.CheckpointableTask

覆盖:

triggerCheckpointAsync 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>

declineCheckpoint

protected void declineCheckpoint(long checkpointId)

覆盖:

declineCheckpoint 在类中 StreamTask<OUT,OP extends StreamSource<OUT,SRC>>