Uses of Package
org.apache.flink.streaming.api.operators

Packages that use org.apache.flink.streaming.api.operators

Package	Description
org.apache.flink.runtime.asyncprocessing.operators
org.apache.flink.runtime.asyncprocessing.operators.windowing
org.apache.flink.streaming.api
org.apache.flink.streaming.api.datastream
org.apache.flink.streaming.api.functions.query
org.apache.flink.streaming.api.functions.source
org.apache.flink.streaming.api.graph
org.apache.flink.streaming.api.graph.util
org.apache.flink.streaming.api.operators
org.apache.flink.streaming.api.operators.co
org.apache.flink.streaming.api.operators.collect
org.apache.flink.streaming.api.operators.legacy
org.apache.flink.streaming.api.operators.sort
org.apache.flink.streaming.api.operators.sorted.state
org.apache.flink.streaming.api.operators.sortpartition
org.apache.flink.streaming.api.transformations
org.apache.flink.streaming.runtime.io
org.apache.flink.streaming.runtime.operators
org.apache.flink.streaming.runtime.operators.sink
org.apache.flink.streaming.runtime.operators.windowing
org.apache.flink.streaming.runtime.tasks
org.apache.flink.streaming.runtime.translators
org.apache.flink.streaming.runtime.watermark.extension.eventtime

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.runtime.asyncprocessing.operators

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorV2	New base class for all stream operators, intended to eventually replace AbstractStreamOperator.
Input	Input interface used in MultipleInputStreamOperator.
InternalTimer	Internal interface for in-flight timers.
InternalTimerService	Interface for working with time and timers.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
Triggerable	Interface for things that can be called by InternalTimerService.
TwoInputStreamOperator	Interface for stream operators with two inputs.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.runtime.asyncprocessing.operators.windowing

Class	Description
AbstractStreamOperator	Base class for all stream operators.
Input	Input interface used in MultipleInputStreamOperator.
InternalTimer	Internal interface for in-flight timers.
InternalTimerService	Interface for working with time and timers.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OperatorAttributes	OperatorAttributes element provides Job Manager with information that can be used to optimize job performance.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
Triggerable	Interface for things that can be called by InternalTimerService.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api

Class	Description
InternalTimerService	Interface for working with time and timers.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.datastream

Class	Description
OneInputStreamOperator	Interface for stream operators with one input.
OneInputStreamOperatorFactory	A factory to create OneInputStreamOperator.
StreamOperatorFactory	A factory to create StreamOperator.
StreamSource	Deprecated. This class is based on the SourceFunction API, which is due to be removed.
TwoInputStreamOperator	Interface for stream operators with two inputs.
TwoInputStreamOperatorFactory	A factory to create TwoInputStreamOperator.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.functions.query

Class	Description
AbstractStreamOperator	Base class for all stream operators.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
StreamOperator	Basic interface for stream operators.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.functions.source

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OneInputStreamOperatorFactory	A factory to create OneInputStreamOperator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.graph

Class	Description
InternalTimeServiceManager.Provider	A provider pattern for creating an instance of a InternalTimeServiceManager.
SourceOperatorFactory	The Factory class for SourceOperator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.graph.util

Class	Description
StreamOperatorFactory	A factory to create StreamOperator.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
AbstractUdfStreamOperator	This is used as the base class for operators that have a user-defined function.
BoundedOneInput	Interface for one-input operators that need to be notified about the logical/semantical end of input.
ChainingStrategy	Defines the chaining scheme for the operator.
CoordinatedOperatorFactory	A factory class for the StreamOperators implementing OperatorEventHandler.
Input	Input interface used in MultipleInputStreamOperator.
InputFormatOperatorFactory	Input format source operator factory.
InputSelection	Describe the input selection that stream operators want to read records.
InputSelection.Builder	Utility class for creating InputSelection.
InternalTimer	Internal interface for in-flight timers.
InternalTimerService	Interface for working with time and timers.
InternalTimerServiceImpl	InternalTimerService that stores timers on the Java heap.
InternalTimersSnapshot	A snapshot of internal timers, containing event and processing timers and the serializers to use to write / read them.
InternalTimersSnapshotReaderWriters.InternalTimersSnapshotReader	A reader for a InternalTimersSnapshot.
InternalTimersSnapshotReaderWriters.InternalTimersSnapshotWriter	A writer for a InternalTimersSnapshot.
InternalTimeServiceManager	An entity keeping all the time-related services.
InternalTimeServiceManager.Provider	A provider pattern for creating an instance of a InternalTimeServiceManager.
InternalTimeServiceManager.ShouldStopAdvancingFn	Signals whether the watermark should continue advancing.
InternalTimeServiceManagerImpl	An entity keeping all the time-related services.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OperatorAttributes	OperatorAttributes element provides Job Manager with information that can be used to optimize job performance.
OperatorAttributesBuilder	The builder class for OperatorAttributes.
OperatorSnapshotFutures	Result of StreamOperator.snapshotState(long, long, org.apache.flink.runtime.checkpoint.CheckpointOptions, org.apache.flink.runtime.state.CheckpointStreamFactory).
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
OutputFormatOperatorFactory	Interface for operator factories which create the sink operator containing an OutputFormat.
SimpleOperatorFactory	Simple factory which just wrap existed StreamOperator.
StreamingRuntimeContext	Implementation of the RuntimeContext, for streaming operators.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateContext	This interface represents a context from which a stream operator can initialize everything connected to state such as e.g. backends, raw state, and timer service manager.
StreamOperatorStateHandler	Class encapsulating various state backend handling logic for StreamOperator implementations.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
StreamSource	Deprecated. This class is based on the SourceFunction API, which is due to be removed.
StreamTaskStateInitializer	This is the interface through which stream task expose a StreamOperatorStateContext to their operators.
StreamTaskStateInitializerImpl.KeyedStateBackendCreator	Functional interface to create the keyed state backend.
TimerHeapInternalTimer	Implementation of InternalTimer to use with a HeapPriorityQueueSet.
TimerSerializer	A serializer for TimerHeapInternalTimer objects that produces a serialization format that is lexicographically aligned the priority of the timers.
TimerSerializerSnapshot	Snapshot class for the TimerSerializer.
Triggerable	Interface for things that can be called by InternalTimerService.
UdfStreamOperatorFactory	Udf stream operator factory.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.co

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractUdfStreamOperator	This is used as the base class for operators that have a user-defined function.
BoundedMultiInput	Interface for multi-input operators that need to be notified about the logical/semantical end of input.
InputSelectable	Interface for stream operators that can select the input to get StreamRecord.
InputSelection	Describe the input selection that stream operators want to read records.
InternalTimer	Internal interface for in-flight timers.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
StreamOperator	Basic interface for stream operators.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
TimestampedCollector	Wrapper around an Output for user functions that expect a Output.
Triggerable	Interface for things that can be called by InternalTimerService.
TwoInputStreamOperator	Interface for stream operators with two inputs.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.collect

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
AbstractUdfStreamOperator	This is used as the base class for operators that have a user-defined function.
CoordinatedOperatorFactory	A factory class for the StreamOperators implementing OperatorEventHandler.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
SimpleOperatorFactory	Simple factory which just wrap existed StreamOperator.
SimpleUdfStreamOperatorFactory	Udf stream operator factory which just wrap existed AbstractUdfStreamOperator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
StreamSink	A StreamOperator for executing SinkFunctions.
UdfStreamOperatorFactory	Udf stream operator factory.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.legacy

Class	Description
StreamOperatorFactory	A factory to create StreamOperator.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.sort

Class	Description
InputSelectable	Interface for stream operators that can select the input to get StreamRecord.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.sorted.state

Class	Description
InternalTimerService	Interface for working with time and timers.
InternalTimeServiceManager	An entity keeping all the time-related services.
InternalTimeServiceManager.ShouldStopAdvancingFn	Signals whether the watermark should continue advancing.
KeyContext	Interface for setting and querying the current key of keyed operations.
Triggerable	Interface for things that can be called by InternalTimerService.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.operators.sortpartition

Class	Description
AbstractStreamOperator	Base class for all stream operators.
BoundedOneInput	Interface for one-input operators that need to be notified about the logical/semantical end of input.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OperatorAttributes	OperatorAttributes element provides Job Manager with information that can be used to optimize job performance.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.api.transformations

Class	Description
ChainingStrategy	Defines the chaining scheme for the operator.
OneInputStreamOperator	Interface for stream operators with one input.
StreamOperatorFactory	A factory to create StreamOperator.
StreamSink	A StreamOperator for executing SinkFunctions.
StreamSource	Deprecated. This class is based on the SourceFunction API, which is due to be removed.
TwoInputStreamOperator	Interface for stream operators with two inputs.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.io

Class	Description
BoundedMultiInput	Interface for multi-input operators that need to be notified about the logical/semantical end of input.
Input	Input interface used in MultipleInputStreamOperator.
InputSelectable	Interface for stream operators that can select the input to get StreamRecord.
MultipleInputStreamOperator	Interface for stream operators with multiple Inputs.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
SourceOperator	Base source operator only used for integrating the source reader which is proposed by FLIP-27.
TwoInputStreamOperator	Interface for stream operators with two inputs.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.operators

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OneInputStreamOperatorFactory	A factory to create OneInputStreamOperator.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.operators.sink

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OneInputStreamOperatorFactory	A factory to create OneInputStreamOperator.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.operators.windowing

Class	Description
AbstractStreamOperator	Base class for all stream operators.
AbstractStreamOperatorFactory	Base class for all stream operator factories.
AbstractUdfStreamOperator	This is used as the base class for operators that have a user-defined function.
Input	Input interface used in MultipleInputStreamOperator.
InternalTimer	Internal interface for in-flight timers.
InternalTimerService	Interface for working with time and timers.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
OneInputStreamOperatorFactory	A factory to create OneInputStreamOperator.
OperatorAttributes	OperatorAttributes element provides Job Manager with information that can be used to optimize job performance.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorParameters	Helper class to construct AbstractStreamOperatorV2.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
TimestampedCollector	Wrapper around an Output for user functions that expect a Output.
Triggerable	Interface for things that can be called by InternalTimerService.
UserFunctionProvider	The interface with user function.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.tasks

Class	Description
BoundedMultiInput	Interface for multi-input operators that need to be notified about the logical/semantical end of input.
Input	Input interface used in MultipleInputStreamOperator.
OperatorSnapshotFutures	Result of StreamOperator.snapshotState(long, long, org.apache.flink.runtime.checkpoint.CheckpointOptions, org.apache.flink.runtime.state.CheckpointStreamFactory).
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.
SourceOperator	Base source operator only used for integrating the source reader which is proposed by FLIP-27.
StreamOperator	Basic interface for stream operators.
StreamSource	Deprecated. This class is based on the SourceFunction API, which is due to be removed.
StreamTaskStateInitializer	This is the interface through which stream task expose a StreamOperatorStateContext to their operators.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.translators

Class	Description
AbstractStreamOperator	Base class for all stream operators.
Input	Input interface used in MultipleInputStreamOperator.
KeyContext	Interface for setting and querying the current key of keyed operations.
KeyContextHandler	This interface is used to optimize the calls of Input.setKeyContextElement(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>), StreamOperator.setKeyContextElement1(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>) and StreamOperator.setKeyContextElement2(org.apache.flink.streaming.runtime.streamrecord.StreamRecord<?>).
OneInputStreamOperator	Interface for stream operators with one input.
StreamOperator	Basic interface for stream operators.
StreamOperatorFactory	A factory to create StreamOperator.
StreamOperatorStateHandler.CheckpointedStreamOperator	Custom state handling hooks to be invoked by StreamOperatorStateHandler.
YieldingOperator	A V1 operator that needs access to the MailboxExecutor should implement this interface.

Classes in org.apache.flink.streaming.api.operators used by org.apache.flink.streaming.runtime.watermark.extension.eventtime

Class	Description
InternalTimeServiceManager	An entity keeping all the time-related services.
Output	A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.