官方文档 https://code.google.com/p/guava-libraries/wiki/CachesExplained
LoadingCache
这种用法,我个人用的比较多.不多说,直接看代码(例子来自官方文档).
LoadingCache<Key, Graph> graphs = CacheBuilder.newBuilder() .maximumSize(1000) //最多1000个 .expireAfterWrite(10, TimeUnit.MINUTES)//写入以后缓存10min. .removalListener(MY_LISTENER)//listenner设置 .build( new CacheLoader<Key, Graph>() { //最后load的方法. public Graph load(Key key) throws AnyException { return createExpensiveGraph(key); } });
上面的代码很容易理解..在使用的时候,就非常简单了.只需要
graphs.getUnchecked(key)
还是很简单的.
但是这里有一个要求,load的返回值不允许为null..但是我们很多业务场景经常会遇到null的返回值.解决的方法就是通过optional .具体看实际的代码
/** * 抽奖ID对应的抽奖信息cache */ private LoadingCache<Long,Optional<LotteryAwardMO>> idLotteryAwardCache; private void init() { idLotteryAwardCache = CacheBuilder.newBuilder().maximumSize(100).expireAfterWrite(5, TimeUnit.SECONDS).build(new CacheLoader<Long, Optional<LotteryAwardMO>>() { @Override public Optional<LotteryAwardMO> load(Long key) throws Exception { LotteryAwardMsgBO lotteryAwardMsgBO = lotteryAwardMsgManager.get(key); return Optional.fromNullable(toLotteryAwardMO(lotteryAwardMsgBO)); } }); }
用法也很简单
idLotteryAwardCache.getUnchecked(awardId).orNull()
CallBack
callback的用法,等我在实际中用到了,再写吧
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