org.apache.flink.streaming.api.operators

Interface InternalTimeServiceManager<K>

Type Parameters:

K - The type of keys used for the timers and the registry.

All Known Implementing Classes:

BatchExecutionInternalTimeServiceManager, InternalTimeServiceManagerImpl

@Internal
public interface InternalTimeServiceManager<K>

An entity keeping all the time-related services.

NOTE: These services are only available to keyed operators.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	InternalTimeServiceManager.Provider A provider pattern for creating an instance of a InternalTimeServiceManager.
static interface	InternalTimeServiceManager.ShouldStopAdvancingFn Signals whether the watermark should continue advancing.

Method Summary

Modifier and Type	Method and Description
void	advanceWatermark(Watermark watermark) Advances the Watermark of all managed timer services, potentially firing event time timers.
<N> InternalTimerService<N>	getAsyncInternalTimerService(String name, org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, Triggerable<K,N> triggerable, org.apache.flink.runtime.asyncprocessing.AsyncExecutionController<K> asyncExecutionController) Creates an InternalTimerServiceAsyncImpl for handling a group of timers identified by the given name.
<N> InternalTimerService<N>	getInternalTimerService(String name, org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, Triggerable<K,N> triggerable) Creates an InternalTimerService for handling a group of timers identified by the given name.
void	snapshotToRawKeyedState(org.apache.flink.runtime.state.KeyedStateCheckpointOutputStream stateCheckpointOutputStream, String operatorName) Snapshots the timers to raw keyed state.
boolean	tryAdvanceWatermark(Watermark watermark, InternalTimeServiceManager.ShouldStopAdvancingFn shouldStopAdvancingFn) Try to advanceWatermark(Watermark), but if InternalTimeServiceManager.ShouldStopAdvancingFn returns true, stop the advancement and return as soon as possible.

Method Detail

getInternalTimerService

<N> InternalTimerService<N> getInternalTimerService(String name,
                                                    org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                                    org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                                                    Triggerable<K,N> triggerable)

Creates an InternalTimerService for handling a group of timers identified by the given name. The timers are scoped to a key and namespace.

When a timer fires the given Triggerable will be invoked.

getAsyncInternalTimerService

<N> InternalTimerService<N> getAsyncInternalTimerService(String name,
                                                         org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                                         org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                                                         Triggerable<K,N> triggerable,
                                                         org.apache.flink.runtime.asyncprocessing.AsyncExecutionController<K> asyncExecutionController)

Creates an InternalTimerServiceAsyncImpl for handling a group of timers identified by the given name. The timers are scoped to a key and namespace. Mainly used by async operators.

Some essential order preservation will be added when the given Triggerable is invoked.

advanceWatermark

void advanceWatermark(Watermark watermark)
               throws Exception

Advances the Watermark of all managed timer services, potentially firing event time timers.

Throws:

Exception

tryAdvanceWatermark

boolean tryAdvanceWatermark(Watermark watermark,
                            InternalTimeServiceManager.ShouldStopAdvancingFn shouldStopAdvancingFn)
                     throws Exception

Try to advanceWatermark(Watermark), but if InternalTimeServiceManager.ShouldStopAdvancingFn returns true, stop the advancement and return as soon as possible.

Returns:

true if Watermark has been fully processed, false otherwise.

Throws:

Exception

snapshotToRawKeyedState

void snapshotToRawKeyedState(org.apache.flink.runtime.state.KeyedStateCheckpointOutputStream stateCheckpointOutputStream,
                             String operatorName)
                      throws Exception

Snapshots the timers to raw keyed state.

TODO: This can be removed once heap-based timers are integrated with RocksDB incremental snapshots.

Throws:

Exception