| /* |
| * 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.client.java.example; |
| |
| import java.time.Duration; |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.rocketmq.client.apis.ClientConfiguration; |
| import org.apache.rocketmq.client.apis.ClientException; |
| import org.apache.rocketmq.client.apis.ClientServiceProvider; |
| import org.apache.rocketmq.client.apis.SessionCredentialsProvider; |
| import org.apache.rocketmq.client.apis.StaticSessionCredentialsProvider; |
| import org.apache.rocketmq.client.apis.consumer.FilterExpression; |
| import org.apache.rocketmq.client.apis.consumer.FilterExpressionType; |
| import org.apache.rocketmq.client.apis.consumer.SimpleConsumer; |
| import org.apache.rocketmq.client.apis.message.MessageId; |
| import org.apache.rocketmq.client.apis.message.MessageView; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class SimpleConsumerExample { |
| private static final Logger log = LoggerFactory.getLogger(SimpleConsumerExample.class); |
| |
| private SimpleConsumerExample() { |
| } |
| |
| @SuppressWarnings({"resource", "InfiniteLoopStatement"}) |
| public static void main(String[] args) throws ClientException { |
| final ClientServiceProvider provider = ClientServiceProvider.loadService(); |
| |
| // Credential provider is optional for client configuration. |
| String accessKey = "yourAccessKey"; |
| String secretKey = "yourSecretKey"; |
| SessionCredentialsProvider sessionCredentialsProvider = |
| new StaticSessionCredentialsProvider(accessKey, secretKey); |
| |
| String endpoints = "foobar.com:8080"; |
| ClientConfiguration clientConfiguration = ClientConfiguration.newBuilder() |
| .setEndpoints(endpoints) |
| // On some Windows platforms, you may encounter SSL compatibility issues. Try turning off the SSL option in |
| // client configuration to solve the problem please if SSL is not essential. |
| // .enableSsl(false) |
| .setCredentialProvider(sessionCredentialsProvider) |
| .build(); |
| String consumerGroup = "yourConsumerGroup"; |
| Duration awaitDuration = Duration.ofSeconds(30); |
| String tag = "yourMessageTagA"; |
| String topic = "yourTopic"; |
| FilterExpression filterExpression = new FilterExpression(tag, FilterExpressionType.TAG); |
| // In most case, you don't need to create too many consumers, singleton pattern is recommended. |
| SimpleConsumer consumer = provider.newSimpleConsumerBuilder() |
| .setClientConfiguration(clientConfiguration) |
| // Set the consumer group name. |
| .setConsumerGroup(consumerGroup) |
| // set await duration for long-polling. |
| .setAwaitDuration(awaitDuration) |
| // Set the subscription for the consumer. |
| .setSubscriptionExpressions(Collections.singletonMap(topic, filterExpression)) |
| .build(); |
| // Max message num for each long polling. |
| int maxMessageNum = 16; |
| // Set message invisible duration after it is received. |
| Duration invisibleDuration = Duration.ofSeconds(15); |
| // Receive message, multi-threading is more recommended. |
| do { |
| final List<MessageView> messages = consumer.receive(maxMessageNum, invisibleDuration); |
| log.info("Received {} message(s)", messages.size()); |
| for (MessageView message : messages) { |
| final MessageId messageId = message.getMessageId(); |
| try { |
| consumer.ack(message); |
| log.info("Message is acknowledged successfully, messageId={}", messageId); |
| } catch (Throwable t) { |
| log.error("Message is failed to be acknowledged, messageId={}", messageId, t); |
| } |
| } |
| } while (true); |
| // Close the simple consumer when you don't need it anymore. |
| // You could close it manually or add this into the JVM shutdown hook. |
| // consumer.close(); |
| } |
| } |