[GitHub] [rocketmq] RongtongJin commented on a change in pull request #1422: [RIP-16]Support request/response pattern

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RongtongJin commented on a change in pull request #1422: [RIP-16]Support request/response pattern
URL: https://github.com/apache/rocketmq/pull/1422#discussion_r326885088
 
 

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 File path: example/src/main/java/org/apache/rocketmq/example/rpc/ResponseConsumer.java
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+/*
+ * 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.rocketmq.example.rpc;
+
+import java.util.List;
+import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
+import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
+import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
+import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
+import org.apache.rocketmq.client.exception.MQBrokerException;
+import org.apache.rocketmq.client.exception.MQClientException;
+import org.apache.rocketmq.client.log.ClientLogger;
+import org.apache.rocketmq.client.producer.SendResult;
+import org.apache.rocketmq.client.utils.MessageUtil;
+import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
+import org.apache.rocketmq.common.message.Message;
+import org.apache.rocketmq.common.message.MessageConst;
+import org.apache.rocketmq.common.message.MessageExt;
+import org.apache.rocketmq.logging.InternalLogger;
+import org.apache.rocketmq.remoting.exception.RemotingException;
+
+public class ResponseConsumer {
+    private static final InternalLogger log = ClientLogger.getLog();
+
+    public static void main(String[] args) throws InterruptedException, MQClientException {
+        String consumerGroup = "please_rename_unique_group_name";
+        String topic = "RequestTopic";
+
+        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(consumerGroup);
+        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);
+
+        consumer.registerMessageListener(new MessageListenerConcurrently() {
+            @Override
+            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
+                for (MessageExt msg : msgs) {
+                    try {
+                        log.info("handle message: {} body={}", msg, new String(msg.getBody()));
+                        String replyTo = msg.getProperty(MessageConst.PROPERTY_MESSAGE_REPLY_TO);
+
+                        //You must use MessageUtil to creage reply message, otherwise reply message maybe wrong.
+                        byte[] replyContent = "reply message contents.".getBytes();
+                        Message replyMessage = MessageUtil.createReplyMessage(msg, replyContent);
+
+                        //maybe you should create a producer to send reply message.
+                        SendResult sendResult = consumer.getDefaultMQPushConsumerImpl().getmQClientFactory().getDefaultMQProducer().send(replyMessage, 3000);
+                        System.out.printf("reply msg %s to %s , %s %n", replyMessage.toString(), replyTo, sendResult.toString());
+                    } catch (MQClientException e) {
 
 Review comment:
   You can use mutil-catch to make code cleaner under JDK 7

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