org.apache.flink.runtime.state.filesystem

Class FileSerializableStateHandle<T extends Serializable>

java.lang.Object

org.apache.flink.runtime.state.AbstractCloseableHandle

org.apache.flink.runtime.state.filesystem.AbstractFileStateHandle

org.apache.flink.runtime.state.filesystem.FileSerializableStateHandle<T>

Type Parameters:

T - The type of state pointed to by the state handle.

All Implemented Interfaces:

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

public class FileSerializableStateHandle<T extends Serializable>
extends AbstractFileStateHandle
implements StateHandle<T>

A state handle that points to state stored in a file via Java Serialization.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FileSerializableStateHandle(org.apache.flink.core.fs.Path filePath) Creates a new FileSerializableStateHandle pointing to state at the given file path.

Method Summary

Modifier and Type	Method and Description
T	getState(ClassLoader classLoader) This retrieves and return the state represented by the handle.
long	getStateSize() Returns the file size in bytes.

Methods inherited from class org.apache.flink.runtime.state.filesystem.AbstractFileStateHandle

discardState, getFilePath, getFileSize, getFileSystem

Methods inherited from class org.apache.flink.runtime.state.AbstractCloseableHandle

close, ensureNotClosed, isClosed, registerCloseable

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

discardState

Methods inherited from interface java.io.Closeable

close

Constructor Detail

FileSerializableStateHandle

public FileSerializableStateHandle(org.apache.flink.core.fs.Path filePath)

Creates a new FileSerializableStateHandle pointing to state at the given file path.

Parameters:

filePath - The path to the file containing the checkpointed state.

Method Detail

getState

public T getState(ClassLoader classLoader)
           throws Exception

Description copied from interface: StateHandle

This retrieves and return the state represented by the handle.

Specified by:

getState in interface StateHandle<T extends Serializable>

Parameters:

classLoader - Class loader for deserializing user code specific classes

Returns:

The state represented by the handle.

Throws:

Exception - Thrown, if the state cannot be fetched.

getStateSize

public long getStateSize()
                  throws IOException

Returns the file size in bytes.

Specified by:

getStateSize in interface StateObject

Returns:

The file size in bytes.

Throws:

IOException - Thrown if the file system cannot be accessed.