T - The type of the input elementspublic class TimestampsAndWatermarksOperator<T> extends AbstractStreamOperator<T> implements OneInputStreamOperator<T,T>, ProcessingTimeService.ProcessingTimeCallback
These two responsibilities run in the same operator rather than in two different ones, because the implementation of the timestamp assigner and the watermark generator is frequently in the same class (and should be run in the same instance), even though the separate interfaces support the use of different classes.
| Modifier and Type | Class and Description |
|---|---|
static class |
TimestampsAndWatermarksOperator.WatermarkEmitter
Implementation of the
WatermarkEmitter, based on the components that are available
inside a stream operator. |
chainingStrategy, config, lastRecordAttributes1, lastRecordAttributes2, latencyStats, LOG, metrics, output, processingTimeService, stateHandler, stateKeySelector1, stateKeySelector2, timeServiceManager| Constructor and Description |
|---|
TimestampsAndWatermarksOperator(WatermarkStrategy<T> watermarkStrategy,
boolean emitProgressiveWatermarks) |
| Modifier and Type | Method and Description |
|---|---|
void |
close()
This method is called at the very end of the operator's life, both in the case of a
successful completion of the operation, and in the case of a failure and canceling.
|
void |
finish()
This method is called at the end of data processing.
|
void |
onProcessingTime(long timestamp)
This method is invoked with the time which the callback register for.
|
void |
open()
This method is called immediately before any elements are processed, it should contain the
operator's initialization logic, e.g. state initialization.
|
void |
processElement(StreamRecord<T> element)
Processes one element that arrived on this input of the
MultipleInputStreamOperator. |
void |
processWatermark(Watermark mark)
Override the base implementation to completely ignore watermarks propagated from upstream,
except for the "end of time" watermark.
|
void |
processWatermarkStatus(WatermarkStatus watermarkStatus)
Override the base implementation to completely ignore statuses propagated from upstream.
|
getChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getStateKeySelector1, getStateKeySelector2, getTimeServiceManager, getUserCodeClassloader, hasKeyContext1, hasKeyContext2, initializeState, initializeState, isUsingCustomRawKeyedState, notifyCheckpointAborted, notifyCheckpointComplete, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processRecordAttributes, processRecordAttributes1, processRecordAttributes2, processWatermark1, processWatermark2, processWatermarkStatus1, processWatermarkStatus2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setMailboxExecutor, setProcessingTimeService, setup, snapshotState, snapshotState, useSplittableTimersclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitsetKeyContextElementgetMetricGroup, getOperatorAttributes, getOperatorID, initializeState, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotStatenotifyCheckpointAborted, notifyCheckpointCompletegetCurrentKey, setCurrentKeyprocessLatencyMarker, processRecordAttributeshasKeyContextpublic TimestampsAndWatermarksOperator(WatermarkStrategy<T> watermarkStrategy, boolean emitProgressiveWatermarks)
public void open()
throws Exception
AbstractStreamOperatorThe default implementation does nothing.
open in interface StreamOperator<T>open in class AbstractStreamOperator<T>Exception - An exception in this method causes the operator to fail.public void close()
throws Exception
StreamOperatorThis method is expected to make a thorough effort to release all resources that the operator has acquired.
NOTE:It can not emit any records! If you need to emit records at the end of
processing, do so in the StreamOperator.finish() method.
close in interface StreamOperator<T>close in class AbstractStreamOperator<T>Exceptionpublic void processElement(StreamRecord<T> element) throws Exception
InputMultipleInputStreamOperator.
This method is guaranteed to not be called concurrently with other methods of the operator.processElement in interface Input<T>Exceptionpublic void onProcessingTime(long timestamp)
throws Exception
ProcessingTimeService.ProcessingTimeCallbackonProcessingTime in interface ProcessingTimeService.ProcessingTimeCallbacktimestamp - The time this callback was registered for.Exceptionpublic void processWatermark(Watermark mark) throws Exception
processWatermark in interface Input<T>processWatermark in class AbstractStreamOperator<T>ExceptionWatermarkpublic void processWatermarkStatus(WatermarkStatus watermarkStatus) throws Exception
processWatermarkStatus in interface Input<T>processWatermarkStatus in class AbstractStreamOperator<T>ExceptionWatermarkStatuspublic void finish()
throws Exception
StreamOperatorThe method is expected to flush all remaining buffered data. Exceptions during this flushing of buffered data should be propagated, in order to cause the operation to be recognized as failed, because the last data items are not processed properly.
After this method is called, no more records can be produced for the downstream operators.
WARNING: It is not safe to use this method to commit any transactions or other side
effects! You can use this method to flush any buffered data that can later on be committed
e.g. in a CheckpointListener.notifyCheckpointComplete(long).
NOTE:This method does not need to close any resources. You should release external
resources in the StreamOperator.close() method.
finish in interface StreamOperator<T>finish in class AbstractStreamOperator<T>Exception - An exception in this method causes the operator to fail.Copyright © 2014–2024 The Apache Software Foundation. All rights reserved.