Can I do a synchronous request with volley?

Question

Imagine I\'m in a Service that already has a background thread. Can I do a request using volley in that same thread, so that callbacks happen synchronously?

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Answer 1

I want to add something to Matthew's accepted answer. While RequestFuture might seem to make a synchronous call from the thread you created it, it does not. Instead, the call is executed on a background thread.

From what I understand after going through the library, requests in the RequestQueue are dispatched in its start() method:

    public void start() {
        ....
        mCacheDispatcher = new CacheDispatcher(...);
        mCacheDispatcher.start();
        ....
           NetworkDispatcher networkDispatcher = new NetworkDispatcher(...);
           networkDispatcher.start();
        ....
    }

Now both CacheDispatcher and NetworkDispatcher classes extend thread. So effectively a new worker thread is spawned for dequeuing the request queue and the response is returned to the success and error listeners implemented internally by RequestFuture.

Although your second purpose is attained but you first purpose is not since a new thread is always spawned, no matter from which thread you execute RequestFuture.

In short, true synchronous request is not possible with default Volley library. Correct me if I am wrong.