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.command;
  
  import org.apache.activemq.state.CommandVisitor;
  
  /**
   * The Command Pattern so that we can send and receive commands on the different
   * transports
   */
  public interface Command extends DataStructure {
  
      void setCommandId(int value);
  
      /**
       * @return the unique ID of this request used to map responses to requests
       */
      int getCommandId();
  
      void setResponseRequired(boolean responseRequired);
  
      boolean isResponseRequired();
  
      boolean isResponse();
  
      boolean isMessageDispatch();
  
      boolean isBrokerInfo();
  
      boolean isWireFormatInfo();
  
      boolean isMessage();
  
      boolean isMessageAck();
  
      boolean isMessageDispatchNotification();
  
      boolean isShutdownInfo();
  
      boolean isConnectionControl();
  
      boolean isConsumerControl();
  
      Response visit(CommandVisitor visitor) throws Exception;
  
      /**
       * The endpoint within the transport where this message came from which
       * could be null if the transport only supports a single endpoint.
       */
      Endpoint getFrom();
  
      void setFrom(Endpoint from);
  
      /**
       * The endpoint within the transport where this message is going to - null
       * means all endpoints.
       */
      Endpoint getTo();
  
      void setTo(Endpoint to);
  }
  