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.command; 018 019import org.apache.activemq.state.CommandVisitor; 020 021/** 022 * The Command Pattern so that we can send and receive commands on the different 023 * transports 024 */ 025public interface Command extends DataStructure { 026 027 void setCommandId(int value); 028 029 /** 030 * @return the unique ID of this request used to map responses to requests 031 */ 032 int getCommandId(); 033 034 void setResponseRequired(boolean responseRequired); 035 036 boolean isResponseRequired(); 037 038 boolean isResponse(); 039 040 boolean isMessageDispatch(); 041 042 boolean isBrokerInfo(); 043 044 boolean isWireFormatInfo(); 045 046 boolean isMessage(); 047 048 boolean isMessageAck(); 049 050 boolean isMessageDispatchNotification(); 051 052 boolean isShutdownInfo(); 053 054 boolean isConnectionControl(); 055 056 boolean isConsumerControl(); 057 058 Response visit(CommandVisitor visitor) throws Exception; 059 060 /** 061 * The endpoint within the transport where this message came from which 062 * could be null if the transport only supports a single endpoint. 063 */ 064 Endpoint getFrom(); 065 066 void setFrom(Endpoint from); 067 068 /** 069 * The endpoint within the transport where this message is going to - null 070 * means all endpoints. 071 */ 072 Endpoint getTo(); 073 074 void setTo(Endpoint to); 075}