org.apache.flink.runtime.state.memory

Class MemCheckpointStreamFactory

java.lang.Object

org.apache.flink.runtime.state.memory.MemCheckpointStreamFactory

All Implemented Interfaces:

CheckpointStreamFactory

public class MemCheckpointStreamFactory
extends Object
implements CheckpointStreamFactory

CheckpointStreamFactory that produces streams that write to in-memory byte arrays.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MemCheckpointStreamFactory.MemoryCheckpointOutputStream A CheckpointStateOutputStream that writes into a byte array.

Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.CheckpointStreamFactory

CheckpointStreamFactory.CheckpointStateOutputStream

Constructor Summary

Constructors

Constructor and Description
MemCheckpointStreamFactory(int maxStateSize) Creates a new in-memory stream factory that accepts states whose serialized forms are up to the given number of bytes.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes the stream factory, releasing all internal resources, but does not delete any persistent checkpoint data.
CheckpointStreamFactory.CheckpointStateOutputStream	createCheckpointStateOutputStream(long checkpointID, long timestamp) Creates an new CheckpointStreamFactory.CheckpointStateOutputStream.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

MemCheckpointStreamFactory

public MemCheckpointStreamFactory(int maxStateSize)

Creates a new in-memory stream factory that accepts states whose serialized forms are up to the given number of bytes.

Parameters:

maxStateSize - The maximal size of the serialized state

Method Detail

close

public void close()
           throws Exception

Description copied from interface: CheckpointStreamFactory

Closes the stream factory, releasing all internal resources, but does not delete any persistent checkpoint data.

Specified by:

close in interface CheckpointStreamFactory

Throws:

Exception - Exceptions can be forwarded and will be logged by the system

createCheckpointStateOutputStream

public CheckpointStreamFactory.CheckpointStateOutputStream createCheckpointStateOutputStream(long checkpointID,
                                                                                    long timestamp)
                                                                                      throws Exception

Description copied from interface: CheckpointStreamFactory

Creates an new CheckpointStreamFactory.CheckpointStateOutputStream. When the stream is closed, it returns a state handle that can retrieve the state back.

Specified by:

createCheckpointStateOutputStream in interface CheckpointStreamFactory

Parameters:

checkpointID - The ID of the checkpoint.

timestamp - The timestamp of the checkpoint.

Returns:

An output stream that writes state for the given checkpoint.

Throws:

Exception - Exceptions may occur while creating the stream and should be forwarded.

toString

public String toString()

Overrides:

toString in class Object