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 */
017package org.apache.activemq.transport;
018
019import java.io.IOException;
020import java.io.InterruptedIOException;
021import java.util.concurrent.ArrayBlockingQueue;
022import java.util.concurrent.TimeUnit;
023
024import org.apache.activemq.command.Response;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028public 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}