org.apache.flink.runtime.state

Class AsynchronousStateHandle<T>

java.lang.Object

org.apache.flink.runtime.state.AsynchronousStateHandle<T>

All Implemented Interfaces:

Closeable, Serializable, AutoCloseable, StateHandle<T>, StateObject

public abstract class AsynchronousStateHandle<T>
extends Object
implements StateHandle<T>

StateHandle that can asynchronously materialize the state that it represents. Instead of representing a materialized handle to state this would normally hold the (immutable) state internally and can materialize it if requested.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AsynchronousStateHandle()

Method Summary

Modifier and Type	Method and Description
void	discardState() Discards the state referred to by this handle, to free up resources in the persistent storage.
T	getState(ClassLoader userCodeClassLoader) This retrieves and return the state represented by the handle.
abstract StateHandle<T>	materialize() Materializes the state held by this AsynchronousStateHandle.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.state.StateObject

getStateSize

Methods inherited from interface java.io.Closeable

close

Constructor Detail

AsynchronousStateHandle

public AsynchronousStateHandle()

Method Detail

materialize

public abstract StateHandle<T> materialize()
                                    throws Exception

Materializes the state held by this AsynchronousStateHandle.

Throws:

Exception

getState

public final T getState(ClassLoader userCodeClassLoader)
                 throws Exception

Description copied from interface: StateHandle

This retrieves and return the state represented by the handle.

Specified by:

getState in interface StateHandle<T>

Parameters:

userCodeClassLoader - Class loader for deserializing user code specific classes

Returns:

The state represented by the handle.

Throws:

Exception - Thrown, if the state cannot be fetched.

discardState

public final void discardState()
                        throws Exception

Description copied from interface: StateObject

Discards the state referred to by this handle, to free up resources in the persistent storage. This method is called when the handle will not be used any more.

Specified by:

discardState in interface StateObject

Throws:

Exception