RxJava – execute the custom operation when unsubscribing

The following example will show how to perform the custom operation when unsubscribing

Service service = new Service();
Observable<String> ob = Observable.create(subscriber -> {
          subscriber.onNext("test");
          service.register();
            
          subscriber.add(Subscriptions.create(() -> {
          // do custom operation
          service.unregister();
      }));
    }
);
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