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;
018    
019    import java.io.IOException;
020    import java.io.InterruptedIOException;
021    import java.util.concurrent.ArrayBlockingQueue;
022    import java.util.concurrent.TimeUnit;
023    
024    import org.apache.activemq.command.Response;
025    import org.slf4j.Logger;
026    import org.slf4j.LoggerFactory;
027    
028    public class FutureResponse {
029        private static final Logger LOG = LoggerFactory.getLogger(FutureResponse.class);
030    
031        private final ResponseCallback responseCallback;
032        private final ArrayBlockingQueue<Response> responseSlot = new ArrayBlockingQueue<Response>(1);
033    
034        public FutureResponse(ResponseCallback responseCallback) {
035            this.responseCallback = responseCallback;
036        }
037    
038        public Response getResult() throws IOException {
039            try {
040                return responseSlot.take();
041            } catch (InterruptedException e) {
042                Thread.currentThread().interrupt();
043                if (LOG.isDebugEnabled()) {
044                    LOG.debug("Operation interupted: " + e, e);
045                }
046                throw new InterruptedIOException("Interrupted.");
047            }
048        }
049    
050        public Response getResult(int timeout) throws IOException {
051            try {
052                Response result = responseSlot.poll(timeout, TimeUnit.MILLISECONDS);
053                if (result == null && timeout > 0) {
054                    throw new RequestTimedOutIOException();
055                }
056                return result;
057            } catch (InterruptedException e) {
058                throw new InterruptedIOException("Interrupted.");
059            }
060        }
061    
062        public void set(Response result) {
063            if (responseSlot.offer(result)) {
064                if (responseCallback != null) {
065                    responseCallback.onCompletion(this);
066                }
067            }
068        }
069    }