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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.cxf.endpoint;

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 org.apache.cxf.message.Message;

/**
 * Asynchronous callback object for calls to {@link Client#invoke(ClientCallback, String, Object...)}
 * and related functions.
 *
 * The default behavior of this expects the following pattern:
 * 
    *
  1. ClientCallback cb = new ClientCallback();
  2. *
  3. client.invoke(cb, "someMethod", ....);
  4. *
  5. cb.wait();
  6. *
  7. // CXF calls notify on the callback object when the operation is complete.
  8. *
*/ public class ClientCallback implements Future { protected Map context; protected Object[] result; protected Throwable exception; protected volatile boolean done; protected boolean cancelled; protected boolean started; public ClientCallback() { } /** * Called when a message is first received prior to any actions * being applied to the message. The InterceptorChain is setup so * modifications to that can be done. */ public void start(Message msg) { started = true; } /** * If the processing of the incoming message proceeds normally, this * method is called with the response context values and the resulting objects. * * The default behavior just stores the objects and calls notifyAll to wake * up threads waiting for the response. * * @param ctx * @param res */ public void handleResponse(Map ctx, Object[] res) { context = ctx; result = res; done = true; synchronized (this) { notifyAll(); } } /** * If processing of the incoming message results in an exception, this * method is called with the resulting exception. * * The default behavior just stores the objects and calls notifyAll to wake * up threads waiting for the response. * * @param ctx * @param ex */ public void handleException(Map ctx, Throwable ex) { context = ctx; exception = ex; done = true; synchronized (this) { notifyAll(); } } public boolean cancel(boolean mayInterruptIfRunning) { if (!started) { cancelled = true; synchronized (this) { notifyAll(); } return true; } return false; } /** * return the map of items returned from an operation. * @return the response context * @throws InterruptedException if the operation was cancelled. * @throws ExecutionException if the operation resulted in a fault. */ public Map getResponseContext() throws InterruptedException, ExecutionException { synchronized (this) { if (!done) { wait(); } } if (cancelled) { throw new InterruptedException("Operation Cancelled"); } if (exception != null) { throw new ExecutionException(exception); } return context; } /** * {@inheritDoc} */ public Object[] get() throws InterruptedException, ExecutionException { synchronized (this) { if (!done) { wait(); } } if (cancelled) { throw new InterruptedException("Operation Cancelled"); } if (exception != null) { throw new ExecutionException(exception); } return result; } /** * {@inheritDoc} */ public Object[] get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException { synchronized (this) { if (!done) { unit.timedWait(this, timeout); } } if (cancelled) { throw new InterruptedException("Operation Cancelled"); } if (!done) { throw new TimeoutException("Timeout Exceeded"); } if (exception != null) { throw new ExecutionException(exception); } return result; } public boolean isCancelled() { return cancelled; } public boolean isDone() { return done; } /* * If the operation completes with a fault, the resulting exception object ends up here. */ public Throwable getException() { return exception; } }




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