content: /**
   * 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;
  
  import java.io.IOException;
  import java.io.InterruptedIOException;
  import java.util.concurrent.ArrayBlockingQueue;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.activemq.command.Response;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class FutureResponse {
      private static final Logger LOG = LoggerFactory.getLogger(FutureResponse.class);
  
      private final ResponseCallback responseCallback;
      private final TransportFilter transportFilter;
  
      private final ArrayBlockingQueue<Response> responseSlot = new ArrayBlockingQueue<Response>(1);
  
      public FutureResponse(ResponseCallback responseCallback) {
          this(responseCallback, null);
      }
  
      public FutureResponse(ResponseCallback responseCallback, TransportFilter transportFilter) {
          this.responseCallback = responseCallback;
          this.transportFilter = transportFilter;
      }
  
      public Response getResult() throws IOException {
          boolean hasInterruptPending = Thread.interrupted();
          try {
              return responseSlot.take();
          } catch (InterruptedException e) {
              hasInterruptPending = false;
              throw dealWithInterrupt(e);
          } finally {
              if (hasInterruptPending) {
                  Thread.currentThread().interrupt();
              }
          }
      }
  
      private InterruptedIOException dealWithInterrupt(InterruptedException e) {
          if (LOG.isDebugEnabled()) {
              LOG.debug("Operation interrupted: " + e, e);
          }
          InterruptedIOException interruptedIOException = new InterruptedIOException(e.getMessage());
          interruptedIOException.initCause(e);
          try {
              if (transportFilter != null) {
                  transportFilter.onException(interruptedIOException);
              }
          } finally {
              Thread.currentThread().interrupt();
          }
          return interruptedIOException;
      }
  
      public Response getResult(int timeout) throws IOException {
          final boolean wasInterrupted = Thread.interrupted();
          try {
              Response result = responseSlot.poll(timeout, TimeUnit.MILLISECONDS);
              if (result == null && timeout > 0) {
                  throw new RequestTimedOutIOException();
              }
              return result;
          } catch (InterruptedException e) {
              throw dealWithInterrupt(e);
          } finally {
              if (wasInterrupted) {
                  Thread.currentThread().interrupt();
              }
          }
      }
  
      public void set(Response result) {
          if (responseSlot.offer(result)) {
              if (responseCallback != null) {
                  responseCallback.onCompletion(this);
              }
          }
      }
  }
  