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

Interface StreamTaskStateInitializer

All Known Implementing Classes:
StreamTaskStateInitializerImpl
public interface StreamTaskStateInitializer
This is the interface through which stream task expose a StreamOperatorStateContext to their operators. Operators, in turn, can use the context to initialize everything connected to their state, such as backends or a timer service manager.

  • Method Details

    • streamOperatorStateContext

      StreamOperatorStateContext streamOperatorStateContext(@Nonnull OperatorID operatorID, @Nonnull String operatorClassName, @Nonnull ProcessingTimeService processingTimeService, @Nonnull KeyContext keyContext, @Nullable org.apache.flink.api.common.typeutils.TypeSerializer<?> keySerializer, @Nonnull org.apache.flink.core.fs.CloseableRegistry streamTaskCloseableRegistry, @Nonnull org.apache.flink.metrics.MetricGroup metricGroup, double managedMemoryFraction, boolean isUsingCustomRawKeyedState, boolean isAsyncState) throws Exception
      Returns the StreamOperatorStateContext for an AbstractStreamOperator that runs in the stream task that owns this manager.
      Parameters:
      operatorID - the id of the operator for which the context is created. Cannot be null.
      operatorClassName - the classname of the operator instance for which the context is created. Cannot be null.
      processingTimeService -
      keyContext - the key context of the operator instance for which the context is created Cannot be null.
      keySerializer - the key-serializer for the operator. Can be null.
      streamTaskCloseableRegistry - the closeable registry to which created closeable objects will be registered.
      metricGroup - the parent metric group for all statebackend metrics
      managedMemoryFraction - the managed memory fraction of the operator for state backend
      isUsingCustomRawKeyedState - flag indicating whether or not the AbstractStreamOperator is writing custom raw keyed state.
      Returns:
      a context from which the given operator can initialize everything related to state.
      Throws:
      Exception - when something went wrong while creating the context.