cserwen commented on code in PR #5895: URL: https://github.com/apache/rocketmq/pull/5895#discussion_r1071998951
########## example/src/main/java/org/apache/rocketmq/example/simple/PopConsumer.java: ########## @@ -0,0 +1,101 @@ +/* + * 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.simple; + +import java.util.Set; +import java.util.stream.Collectors; +import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer; +import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus; +import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently; +import org.apache.rocketmq.common.consumer.ConsumeFromWhere; +import org.apache.rocketmq.common.message.MessageRequestMode; +import org.apache.rocketmq.remoting.protocol.body.ClusterInfo; +import org.apache.rocketmq.remoting.protocol.route.BrokerData; +import org.apache.rocketmq.tools.admin.DefaultMQAdminExt; + +/** + * This example shows how to subscribe and consume messages using providing {@link DefaultMQPushConsumer}. + */ +public class PopConsumer { + + public static final String CONSUMER_GROUP = "please_rename_unique_group_name_4"; + public static final String DEFAULT_NAMESRVADDR = "127.0.0.1:9876"; + public static final String TOPIC = "TopicTest"; + + public static void main(String[] args) throws Exception { + + switchPop(); + /* + * Instantiate with specified consumer group name. + */ + DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(CONSUMER_GROUP); + + /* + * Specify name server addresses. + * <p/> + * + * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR + * <pre> + * {@code + * consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876"); + * } + * </pre> + */ + // Uncomment the following line while debugging, namesrvAddr should be set to your local address +// consumer.setNamesrvAddr(DEFAULT_NAMESRVADDR); + + /* + * Specify where to start in case the specific consumer group is a brand-new one. + */ + consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET); + + /* + * Subscribe one more topic to consume. + */ + consumer.subscribe(TOPIC, "*"); +// consumer.setNamesrvAddr(DEFAULT_NAMESRVADDR); + /* + * Register callback to execute on arrival of messages fetched from brokers. + */ + consumer.registerMessageListener((MessageListenerConcurrently) (msg, context) -> { + System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msg); + return ConsumeConcurrentlyStatus.CONSUME_SUCCESS; + }); + consumer.setClientRebalance(false); Review Comment: Simple code comments are ok, you can refer to other demos. Maybe this line is what really needs to be commented. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
