Java synchronizing based on a parameter (named mutex/lock)

Question

I\'m looking for a way to synchronize a method based on the parameter it receives, something like this:

public synchronized void doSomething(name){
//some co         


        

Answer 1

I've used a cache to store lock objects. The my cache will expire objects after a period, which really only needs to be longer that the time it takes the synchronized process to run

`

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

...

private final Cache mediapackageLockCache = CacheBuilder.newBuilder().expireAfterWrite(DEFAULT_CACHE_EXPIRE, TimeUnit.SECONDS).build();

...

public void doSomething(foo) {
    Object lock = mediapackageLockCache.getIfPresent(foo.toSting());
    if (lock == null) {
        lock = new Object();
        mediapackageLockCache.put(foo.toString(), lock);
    }

    synchronized(lock) {
        // execute code on foo
        ...
    }
}

`