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The ParallelExecutor service allows a computation to occur in parallel.

It can be used in two ways. First, with an explicit Future:

   Future<String> future = executor.invoke(new Invokable<String>() { ... });

The executor will submit the Invokable to a thread pool for execution in the background.

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Another alternative will return an object proxy, not a Future:

  RSSFeed feed = executor.invoke(RSSFeed.class, new Invokable<RSSFeed>() { ... });

This only works if the type is an interface. A proxy for the interface is created around the Future object; any invocation on the proxy will invoke get() on the Future (that is, will block until the value is computed).

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Defaults to 100.