| /** |
| * 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.activemq.transport.amqp.client.util; |
| |
| import java.io.IOException; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * Asynchronous Client Future class. |
| */ |
| public class ClientFuture implements AsyncResult { |
| |
| private final AtomicBoolean completer = new AtomicBoolean(); |
| private final CountDownLatch latch = new CountDownLatch(1); |
| private final ClientFutureSynchronization synchronization; |
| private volatile Throwable error; |
| |
| public ClientFuture() { |
| this(null); |
| } |
| |
| public ClientFuture(ClientFutureSynchronization synchronization) { |
| this.synchronization = synchronization; |
| } |
| |
| @Override |
| public boolean isComplete() { |
| return latch.getCount() == 0; |
| } |
| |
| @Override |
| public void onFailure(Throwable result) { |
| if (completer.compareAndSet(false, true)) { |
| error = result; |
| if (synchronization != null) { |
| synchronization.onPendingFailure(error); |
| } |
| latch.countDown(); |
| } |
| } |
| |
| @Override |
| public void onSuccess() { |
| if (completer.compareAndSet(false, true)) { |
| if (synchronization != null) { |
| synchronization.onPendingSuccess(); |
| } |
| latch.countDown(); |
| } |
| } |
| |
| /** |
| * Timed wait for a response to a pending operation. |
| * |
| * @param amount |
| * The amount of time to wait before abandoning the wait. |
| * @param unit |
| * The unit to use for this wait period. |
| * |
| * @throws IOException if an error occurs while waiting for the response. |
| */ |
| public void sync(long amount, TimeUnit unit) throws IOException { |
| try { |
| latch.await(amount, unit); |
| } catch (InterruptedException e) { |
| Thread.interrupted(); |
| throw IOExceptionSupport.create(e); |
| } |
| |
| failOnError(); |
| } |
| |
| /** |
| * Waits for a response to some pending operation. |
| * |
| * @throws IOException if an error occurs while waiting for the response. |
| */ |
| public void sync() throws IOException { |
| try { |
| latch.await(); |
| } catch (InterruptedException e) { |
| Thread.interrupted(); |
| throw IOExceptionSupport.create(e); |
| } |
| |
| failOnError(); |
| } |
| |
| private void failOnError() throws IOException { |
| Throwable cause = error; |
| if (cause != null) { |
| throw IOExceptionSupport.create(cause); |
| } |
| } |
| } |