org.apache.flink.migration.runtime.state

Class AbstractStateBackend.DataInputViewHandle

java.lang.Object

org.apache.flink.migration.runtime.state.AbstractStateBackend.DataInputViewHandle

All Implemented Interfaces:

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

Enclosing class:

AbstractStateBackend

public static final class AbstractStateBackend.DataInputViewHandle
extends Object
implements StateHandle<DataInputView>

Simple state handle that resolved a DataInputView from a StreamStateHandle.

See Also:

Serialized Form

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
void	discardState() Discards the state referred to by this handle, to free up resources in the persistent storage.
DataInputView	getState(ClassLoader userCodeClassLoader) This retrieves and return the state represented by the handle.
long	getStateSize() Returns the size of the state in bytes.
StreamStateHandle	getStreamStateHandle()

Methods inherited from class java.lang.Object

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

Method Detail

getStreamStateHandle

public StreamStateHandle getStreamStateHandle()

getState

public DataInputView 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<DataInputView>

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 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

getStateSize

public long getStateSize()
                  throws Exception

Description copied from interface: StateObject

Returns the size of the state in bytes.

If the the size is not known, return 0.

Specified by:

getStateSize in interface StateObject

Returns:

Size of the state in bytes.

Throws:

Exception - If the operation fails during size retrieval.

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException