backtype.storm.utils
Class LocalState

java.lang.Object
  backtype.storm.utils.LocalState

public class LocalState
extends Object

A simple, durable, atomic K/V database. *Very inefficient*, should only be used for occasional reads/writes. Every read/write hits disk.

Constructor Summary

LocalState(String backingDir)

Method Summary

void	cleanup(int keepVersions)
Object	get(Object key)
void	put(Object key, Object val)
void	put(Object key, Object val, boolean cleanup)
void	remove(Object key)
void	remove(Object key, boolean cleanup)
Map<Object,Object>	snapshot()

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalState

public LocalState(String backingDir)
           throws IOException

Throws:

IOException

Method Detail

snapshot

public Map<Object,Object> snapshot()
                            throws IOException

Throws:

IOException

get

public Object get(Object key)
           throws IOException

Throws:

IOException

put

public void put(Object key,
                Object val)
         throws IOException

Throws:

IOException

put

public void put(Object key,
                Object val,
                boolean cleanup)
         throws IOException

Throws:

IOException

remove

public void remove(Object key)
            throws IOException

Throws:

IOException

remove

public void remove(Object key,
                   boolean cleanup)
            throws IOException

Throws:

IOException

cleanup

public void cleanup(int keepVersions)
             throws IOException

Throws:

IOException