0tifying futures example

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Here is an example of making use of a notifying future:         FutureListener futureListener = new FutureListener() {            public void futureDone(Future future) {             try {                future.get();             } catch (Exception e) {                // Future did not complete successfully                System.out.println("Help!");             }          }       };             cache.putAsync("key", "value").attachListener(futureListener);