[weld-issues] [JBoss JIRA] Created: (WELDX-74) Support use of decorator of Callable<T>

[Elias Ross (JIRA)]

Support use of decorator of Callable<T>
---------------------------------------

                 Key: WELDX-74
                 URL: https://jira.jboss.org/jira/browse/WELDX-74
             Project: Weld Extensions
          Issue Type: Feature Request
          Components: Java SE
            Reporter: Elias Ross


Decorator exists for Runnable. Should allow for Callable<T> to be used as well.

This is actually pretty useful, for example if you want to execute under a temporary new scope in the same thread, e.g.

@Inject Instance<PaymentProcessor> paymentProcessorSource; // which implements Callable<Result>
Result result = paymentProcessorSource.get().call();

Or, in the case of a thread pool, you can use Future<T> etc.

/**
 * Decorator for all beans which implements Callable. It intercepts the call
 * to the call() method to set up the ThreadContext for the new thread so that
 * instances of @ThreadScoped beans can be correctly resolved.
 */
@Decorator
public class CallableDecorator<T> implements Callable<T> {

   @Inject @Delegate Callable<T> callable;

   /**
    * Set up the ThreadContet and delegate.
    */
   public T call()
   {
      // set up context for this thread
      final ThreadContext threadContext = WeldSEBeanRegistrant.THREAD_CONTEXT;
      threadContext.setBeanStore(new HashMapBeanStore());
      threadContext.setActive(true);
      // run the original thread
     try {
        return callable.call();
    } finally {
      threadContext.destroy();
   }

}


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