io.ray.streaming.runtime.context.impl

Class AtomicFsBackend

java.lang.Object

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

io.ray.streaming.runtime.context.impl.AtomicFsBackend

All Implemented Interfaces:

ContextBackend

public class AtomicFsBackend
extends LocalFileContextBackend

Achieves an atomic `put` method. known issue: if you crashed while write a key at first time, this code will not work.

Constructor Summary

Constructors

Constructor and Description
AtomicFsBackend(ContextBackendConfig config)

Method Summary

Modifier and Type	Method and Description
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

Methods inherited from class io.ray.streaming.runtime.context.impl.LocalFileContextBackend

exists, rename

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicFsBackend

public AtomicFsBackend(ContextBackendConfig config)

Method Detail

get

public byte[] get(String key)
           throws Exception

Description copied from interface: ContextBackend

get content by key

Specified by:

get in interface ContextBackend

Overrides:

get in class LocalFileContextBackend

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

Overrides:

put in class LocalFileContextBackend

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

Overrides:

remove in class LocalFileContextBackend

Parameters:

key - key