Guava Cache与ConcurrentMap很相似，
guava cache 加载缓存主要有两种方式:
- cacheLoader
- callable callback
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| LoadingCache<Key, Value> cache = CacheBuilder.newBuilder()
.build(
new CacheLoader<Key, Value>() {
public Value load(Key key) throws AnyException {
return createValue(key);
}
});
...
try {
return cache.get(key);
} catch (ExecutionException e) {
throw new OtherException(e.getCause());
}
|
这种方式不需要在创建的时候指定load方法，但是需要在get的时候实现一个Callable匿名内部类。
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| Cache<Key, Value> cache = CacheBuilder.newBuilder()
.build(); // look Ma, no CacheLoader
...
try {
cache.get(key, new Callable<Value>() {
@Override
public Value call() throws AnyException {
return doThingsTheHardWay(key);
}
});
} catch (ExecutionException e) {
throw new OtherException(e.getCause());
}
|