io.ray.streaming.runtime.context.impl

Class LocalFileContextBackend

java.lang.Object

io.ray.streaming.runtime.context.impl.LocalFileContextBackend

All Implemented Interfaces:

ContextBackend

Direct Known Subclasses:

AtomicFsBackend

public class LocalFileContextBackend
extends Object
implements ContextBackend

This context backend uses local file system and doesn't supports failover in cluster. But it supports failover in single node. This is a pure file system backend which doesn't support atomic writing, please don't use this class, instead, use AtomicFsBackend which extends this class.

Constructor Summary

Constructors

Constructor and Description
LocalFileContextBackend(ContextBackendConfig config)

Method Summary

Modifier and Type	Method and Description
boolean	exists(String key) check if key exists in state
byte[]	get(String key) get content by key
void	put(String key, byte[] value) put content by key
void	remove(String key) remove content by key
protected void	rename(String fromKey, String toKey)

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalFileContextBackend

public LocalFileContextBackend(ContextBackendConfig config)

Method Detail

exists

public boolean exists(String key)

Description copied from interface: ContextBackend

check if key exists in state

Specified by:

exists in interface ContextBackend

Returns:

true if exists

get

public byte[] get(String key)
           throws Exception

Description copied from interface: ContextBackend

get content by key

Specified by:

get in interface ContextBackend

Parameters:

key - key

Returns:

the StateBackend

Throws:

Exception

put

public void put(String key,
                byte[] value)
         throws Exception

Description copied from interface: ContextBackend

put content by key

Specified by:

put in interface ContextBackend

Parameters:

key - key

value - content

Throws:

Exception

remove

public void remove(String key)

Description copied from interface: ContextBackend

remove content by key

Specified by:

remove in interface ContextBackend

Parameters:

key - key

rename

protected void rename(String fromKey,
                      String toKey)
               throws Exception

Throws:

Exception