com.google.cloud.dataflow.sdk.util

Class TriggerRunner<W extends BoundedWindow>

java.lang.Object

com.google.cloud.dataflow.sdk.util.TriggerRunner<W>

Type Parameters:

W - The kind of windows being processed.

public class TriggerRunner<W extends BoundedWindow>
extends Object

Executes a trigger within the context provided by ReduceFnRunner.

This is responsible for:

• Tracking the finished bits for the trigger tree, included whether the root trigger has finished.
• Ensuring that the timer and state associated with each trigger node is separate.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TriggerRunner.Result Result of trigger execution.

Constructor Summary

Constructors

Constructor and Description
TriggerRunner(ExecutableTrigger<W> rootTrigger, com.google.cloud.dataflow.sdk.util.TriggerContextFactory<W> contextFactory)

Method Summary

Modifier and Type	Method and Description
void	clearEverything(ReduceFn.Context c) Clear all the state for executing triggers, including the finished bits.
void	clearState(ReduceFn.Context c) Clear the state used for executing triggers, but leave the finished set to indicate the window is closed.
boolean	isClosed(ReduceFn.StateContext state) Return true if the trigger is closed in the window corresponding to the specified state.
TriggerRunner.Result	onMerge(ReduceFn.OnMergeContext c) Run the trigger merging logic as part of executing the specified merge.
TriggerRunner.Result	onTimer(ReduceFn.Context c, TimerInternals.TimerData timer) Run the trigger logic appropriate for receiving a timer with the specified destination ID.
void	prefetchForMerge(ReduceFn.MergingStateContext state)
void	prefetchForTimer(ReduceFn.StateContext state)
void	prefetchForValue(ReduceFn.StateContext state)
TriggerRunner.Result	processValue(ReduceFn.ProcessValueContext c) Run the trigger logic to deal with a new value.

Methods inherited from class java.lang.Object

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

Constructor Detail

TriggerRunner

public TriggerRunner(ExecutableTrigger<W> rootTrigger,
                     com.google.cloud.dataflow.sdk.util.TriggerContextFactory<W> contextFactory)

Method Detail

isClosed

public boolean isClosed(ReduceFn.StateContext state)

Return true if the trigger is closed in the window corresponding to the specified state.

processValue

public TriggerRunner.Result processValue(ReduceFn.ProcessValueContext c)
                                  throws Exception

Run the trigger logic to deal with a new value.

Throws:

Exception

onMerge

public TriggerRunner.Result onMerge(ReduceFn.OnMergeContext c)
                             throws Exception

Run the trigger merging logic as part of executing the specified merge.

Throws:

Exception

onTimer

public TriggerRunner.Result onTimer(ReduceFn.Context c,
                                    TimerInternals.TimerData timer)
                             throws Exception

Run the trigger logic appropriate for receiving a timer with the specified destination ID.

Throws:

Exception

clearState

public void clearState(ReduceFn.Context c)
                throws Exception

Clear the state used for executing triggers, but leave the finished set to indicate the window is closed.

Throws:

Exception

clearEverything

public void clearEverything(ReduceFn.Context c)
                     throws Exception

Clear all the state for executing triggers, including the finished bits. This should only be called after the allowed lateness has elapsed, so that the window will never be recreated.

Throws:

Exception

prefetchForValue

public void prefetchForValue(ReduceFn.StateContext state)

prefetchForMerge

public void prefetchForMerge(ReduceFn.MergingStateContext state)

prefetchForTimer

public void prefetchForTimer(ReduceFn.StateContext state)