io.ray.streaming.runtime.context

接口 ContextBackend

所有已知实现类:

AtomicFsBackend, LocalFileContextBackend, MemoryContextBackend

public interface ContextBackend

This interface is used for storing context of JobWorker and JobMaster. The checkpoint returned by user function is also saved using this interface.

方法概要

限定符和类型	方法和说明
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

方法详细资料

exists

boolean exists(String key)
        throws Exception

check if key exists in state

返回:

true if exists

抛出:

Exception

get

byte[] get(String key)
    throws Exception

get content by key

参数:

key - key

返回:

the StateBackend

抛出:

Exception

put

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

put content by key

参数:

key - key

value - content

抛出:

Exception

remove

void remove(String key)
     throws Exception

remove content by key

参数:

key - key

抛出:

Exception