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• CacheRefreshKeys.java

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com.github.javaclub.sword.cache.CacheRefreshKeys Maven / Gradle / Ivy

/*
 * @(#)CacheRefreshKeys.java	2017年6月2日
 *
 * Copyright (c) 2017. All Rights Reserved.
 *
 */

package com.github.javaclub.sword.cache;

import java.util.Set;
import java.util.concurrent.ConcurrentMap;

import com.google.common.collect.Maps;

/**
 * CacheRefreshKeys
 *
 * @author Gerald Chen
 * @version $Id: CacheRefreshKeys.java 2017年6月2日 10:38:16 Exp $
 */
public class CacheRefreshKeys {

	private static CacheRefreshKeys instance = new CacheRefreshKeys();
	
	private ConcurrentMap keysMap = Maps.newConcurrentMap();
	
	private CacheRefreshKeys() {
	}

	public static CacheRefreshKeys getInstance() {
		return instance;
	}

	public void put(String key) {
		keysMap.putIfAbsent(key, key);
	}
	
	public Set keys() {
		return keysMap.keySet();
	}
}