001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.transport.http;
018    
019    import java.io.IOException;
020    import java.util.Queue;
021    import java.util.concurrent.BlockingQueue;
022    import java.util.concurrent.TimeUnit;
023    
024    import org.apache.activemq.transport.TransportSupport;
025    import org.apache.activemq.util.ServiceStopper;
026    
027    /**
028     * A server side HTTP based TransportChannel which processes incoming packets
029     * and adds outgoing packets onto a {@link Queue} so that they can be dispatched
030     * by the HTTP GET requests from the client.
031     *
032     * 
033     */
034    public class  BlockingQueueTransport extends TransportSupport {
035        public static final long MAX_TIMEOUT = 30000L;
036    
037        private BlockingQueue<Object> queue;
038    
039        public BlockingQueueTransport(BlockingQueue<Object> channel) {
040            this.queue = channel;
041        }
042    
043        public BlockingQueue<Object> getQueue() {
044            return queue;
045        }
046    
047        public void oneway(Object command) throws IOException {
048            try {
049                boolean success = queue.offer(command, MAX_TIMEOUT, TimeUnit.MILLISECONDS);
050                if (!success) {
051                    throw new IOException("Fail to add to BlockingQueue. Add timed out after " + MAX_TIMEOUT + "ms: size=" + queue.size());
052                }
053            } catch (InterruptedException e) {
054                throw new IOException("Fail to add to BlockingQueue. Interrupted while waiting for space: size=" + queue.size());
055            }
056        }
057    
058    
059        public String getRemoteAddress() {
060            return "blockingQueue_" + queue.hashCode();
061        }
062    
063        protected void doStart() throws Exception {
064        }
065    
066        protected void doStop(ServiceStopper stopper) throws Exception {
067        }
068    
069        public int getReceiveCounter() {
070            return 0;
071        }
072    }