How about the following code:
// ReentrantLock lock;
lock.acquire();
Object val=cache.get(key);
if(val == null) {
val=fetchValueFromDB();
cache.put(node, key, val);
}
lock.release();
This simply uses external synchronization.
A more elegant solution would be to use a CacheLoader: a get() fetches the
value from the DB and adds it to the cache with a write-lock. CacheLoader
synchronizes access, so only 1 thread actually triggers the loading.
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