title: ListenableFutureTask / ExecutorService
body: <p>I've Guava in my Classpath and want to use <code>ListenableFuture</code>s, but currently I don't know how to submit <code>ListenableFuture</code>s or is it currently only possible to use them without an executor in the calling thread? I've read that a decorator is available in r10 which isn't out?</p>
  
  <p>I've found <code>Futures.makeListenable(Future&lt;V&gt; future)</code> but I'm not sure if that's currently the only way how to use <code>ListenableFuture</code>s.</p>
  
  <p>kind regards,<br>
  Johannes</p>