org.apache.flink.runtime.state.memory

Class MemCheckpointStreamFactory

java.lang.Object

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

All Implemented Interfaces:

CheckpointStreamFactory

Direct Known Subclasses:

NonPersistentMetadataCheckpointStorageLocation, PersistentMetadataCheckpointStorageLocation

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

Modifier and Type	Method and Description
CheckpointStreamFactory.CheckpointStateOutputStream	createCheckpointStateOutputStream(CheckpointedStateScope scope) 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

createCheckpointStateOutputStream

public CheckpointStreamFactory.CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope)
                                                                                      throws IOException

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:

scope - The state's scope, whether it is exclusive or shared.

Returns:

An output stream that writes state for the given checkpoint.

Throws:

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

toString

public String toString()

Overrides:

toString in class Object