org.apache.storm.scheduler.utils

Class SchedulerConfigCache<T>

java.lang.Object

org.apache.storm.scheduler.utils.SchedulerConfigCache<T>

public class SchedulerConfigCache<T>
extends Object

A utility class to cache the scheduler config and refresh after the cache expires.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SchedulerConfigCache.Reloadable<T>

Constructor Summary

Constructors

Constructor and Description
SchedulerConfigCache(Map<String,Object> conf, SchedulerConfigCache.Reloadable<T> reloader)

Method Summary

Modifier and Type	Method and Description
T	get() Get the scheduler config from cache.
void	prepare()
void	refresh() Refresh the config only after the cache expires.

Methods inherited from class java.lang.Object

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

Constructor Detail

SchedulerConfigCache

public SchedulerConfigCache(Map<String,Object> conf,
                            SchedulerConfigCache.Reloadable<T> reloader)

Method Detail

prepare

public void prepare()

refresh

public void refresh()

Refresh the config only after the cache expires. This is not thread-safe and should only be called in single thread.

get

public T get()

Get the scheduler config from cache. This method is thead-safe and can be called in multiple threads.

Returns:

the scheduler config