/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.test.ws.jaxws.samples.asynch;

import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.xml.ws.AsyncHandler;

import org.apache.cxf.annotations.UseAsyncMethod;

@WebService(name = "EndpointService", targetNamespace = "http://org.jboss.ws/cxf/samples/asynch")
@SOAPBinding(style = SOAPBinding.Style.DOCUMENT, use = SOAPBinding.Use.LITERAL, parameterStyle = SOAPBinding.ParameterStyle.BARE)
public class EndpointImpl
{
   //be sure to add dependency on org.apache.cxf module for @UseAsyncMethod annotation to be resolved
   @UseAsyncMethod //.. if supported by underlying container
   public String echo(String user)
   {
      System.out.println("user: " + user);
      return user + " (SYNC)";
   }
   
   //this method is not actually converted into an operation in the wsdl contract, as it's up to the
   //Apache CXF implementation to redirect invocation to this when the @UseAsyncMethod annotated
   //echo method is called.
   public Future<?> echoAsync(final String user, final AsyncHandler<String> asyncHandler)
   {
      final ServerAsyncResponse<String> r = new ServerAsyncResponse<String>();
      //here the business method would likely enqueue the request for a long running process;
      //then the queue might for instance be consumed by a different thread pool...
      new Thread() {
         public void run() {
            r.set(user + " (ASYNC)");
            System.out.println("Responding on background thread...");
            asyncHandler.handleResponse(r);
         }
      }.start();
      //the web container thread proceeds further and the container is able to serve new web requests with it
      return r;
   }
   
   //helper class
   private class ServerAsyncResponse<T> implements javax.xml.ws.Response<T> {
      T value;
      boolean done;
      Throwable throwable;
      
      /**
       * Currently unused
       */
      public boolean cancel(boolean mayInterruptIfRunning) {
          return false;
      }
      /**
       * Currently unused
       */
      public boolean isCancelled() {
          return false;
      }
      public boolean isDone() {
          return done;
      }
      public void set(T t) {
          value = t;
          done = true;
      }
      public T get() throws InterruptedException, ExecutionException {
          if (throwable != null) {
              throw new ExecutionException(throwable);
          }
          return value;
      }
      public T get(long timeout, TimeUnit unit) 
          throws InterruptedException, ExecutionException, TimeoutException {
          return value;
      }
      /**
       * Currently unused
       */
      public Map<String, Object> getContext() {
          return null;
      }
  }
}