K - The type of key returned by the KeySelector.W - The type of Window that the WindowAssigner assigns.public class AggregateWindowOperator<K,W extends Window> extends WindowOperator<K,W>
WindowOperator for grouped window aggregates.
When an element arrives it gets assigned a key using a KeySelector and it gets
assigned to zero or more windows using a WindowAssigner. Based on this, the element
is put into panes. A pane is the bucket of elements that have the same key and same
Window. An element can be in multiple panes if it was assigned to multiple windows by
the WindowAssigner.
Each pane gets its own instance of the provided Trigger. This trigger determines when
the contents of the pane should be processed to emit results. When a trigger fires,
the given NamespaceAggsHandleFunction.getValue(Object)
is invoked to produce the results that are emitted for the pane to which the Trigger
belongs.
| 限定符和类型 | 字段和说明 |
|---|---|
protected RecordEqualiser |
equaliser
The util to compare two RowData equals to each other.
|
collector, previousState, produceUpdates, windowAggregator, windowFunction| 限定符和类型 | 方法和说明 |
|---|---|
protected void |
compileGeneratedCode() |
protected void |
emitWindowResult(W window)
Emits the window result of the given window.
|
void |
open() |
close, dispose, getNumLateRecordsDropped, getWatermarkLatency, onEventTime, onProcessingTime, processElementgetChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getTimeServiceManager, getUserCodeClassloader, initializeState, initializeState, notifyCheckpointAborted, notifyCheckpointComplete, numEventTimeTimers, numProcessingTimeTimers, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processWatermark, processWatermark1, processWatermark2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setProcessingTimeService, setup, snapshotState, snapshotStateclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitprocessLatencyMarker, processWatermarkgetMetricGroup, getOperatorID, initializeState, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotStateprotected RecordEqualiser equaliser
public void open()
throws Exception
protected void compileGeneratedCode()
compileGeneratedCode 在类中 WindowOperator<K,W extends Window>protected void emitWindowResult(W window) throws Exception
WindowOperatoremitWindowResult 在类中 WindowOperator<K,W extends Window>ExceptionCopyright © 2014–2020 The Apache Software Foundation. All rights reserved.