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.util.concurrent.locks.ReentrantLock;
  
  /**
   * Thread safe Transport Filter that serializes calls to and from the Transport Stack.
   */
  public class MutexTransport extends TransportFilter {
  
      private final ReentrantLock writeLock = new ReentrantLock();
      private boolean syncOnCommand;
  
      public MutexTransport(Transport next) {
          super(next);
          this.syncOnCommand = false;
      }
  
      public MutexTransport(Transport next, boolean syncOnCommand) {
          super(next);
          this.syncOnCommand = syncOnCommand;
      }
  
      @Override
      public void onCommand(Object command) {
          if (syncOnCommand) {
              writeLock.lock();
              try {
                  transportListener.onCommand(command);
              } finally {
                  writeLock.unlock();
              }
          } else {
              transportListener.onCommand(command);
          }
      }
  
      @Override
      public FutureResponse asyncRequest(Object command, ResponseCallback responseCallback) throws IOException {
          writeLock.lock();
          try {
              return next.asyncRequest(command, null);
          } finally {
              writeLock.unlock();
          }
      }
  
      @Override
      public void oneway(Object command) throws IOException {
          writeLock.lock();
          try {
              next.oneway(command);
          } finally {
              writeLock.unlock();
          }
      }
  
      @Override
      public Object request(Object command) throws IOException {
          writeLock.lock();
          try {
              return next.request(command);
          } finally {
              writeLock.unlock();
          }
      }
  
      @Override
      public Object request(Object command, int timeout) throws IOException {
          writeLock.lock();
          try {
              return next.request(command, timeout);
          } finally {
              writeLock.unlock();
          }
      }
  
      @Override
      public String toString() {
          return next.toString();
      }
  
      public boolean isSyncOnCommand() {
          return syncOnCommand;
      }
  
      public void setSyncOnCommand(boolean syncOnCommand) {
          this.syncOnCommand = syncOnCommand;
      }
  }
  