第六章 玩转Java整合RabbitMQ 工作队列模型实战（2）
第3集 玩转RabbitMQ工作队列 轮训策略实战
简介：RabbitMQ工作队列 轮训策略讲解实战
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工作队列
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消息生产能力大于消费能力，增加多几个消费节点
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和简单队列类似，增加多个几个消费节点，处于竞争关系
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默认策略：round robin 轮训
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public class Send {
private final static String QUEUE_NAME = "work_mq_rr";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("10.211.55.13");
factory.setUsername("admin");
factory.setPassword("password");
factory.setVirtualHost("/dev");
factory.setPort(5672);
try (
//创建连接
Connection connection = factory.newConnection();
//创建信道
Channel channel = connection.createChannel()) {
/**
* 队列名称
* 持久化配置
* 排他配置
* 自动删除
* 其他参数
*/
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
//轮训发送 10个
for(int i=0;i<10;i++){
String message = "Hello World!"+i;
channel.basicPublish("", QUEUE_NAME, null, message.getBytes(StandardCharsets.UTF_8));
System.out.println(" [x] Sent '" + message + "'");
}
}
}
}
- 消费者代码1
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public class Recv1 {
private final static String QUEUE_NAME = "work_mq_rr";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("10.211.55.13");
factory.setUsername("admin");
factory.setPassword("password");
factory.setVirtualHost("/xdclass1");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
System.out.println(" [*]Waiting for messages. To exit press CTRL+C");
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
//模拟消费缓慢
try {
TimeUnit.SECONDS.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
String message = new String(delivery.getBody(), "UTF-8");
System.out.println("[x] Received '" + message + "'");
//手工确认消息消费，不是多条确认
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
};
//关闭自动确认消息
channel.basicConsume(QUEUE_NAME, false, deliverCallback, consumerTag -> { });
}
}
- 消费者代码2
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public class Recv2 {
private final static String QUEUE_NAME = "work_mq_rr";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("10.211.55.13");
factory.setUsername("admin");
factory.setPassword("password");
factory.setVirtualHost("/xdclass1");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
//模拟消费缓慢
try {
TimeUnit.SECONDS.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x] Received '" + message + "'");
//手工确认消息消费，不是多条确认
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
};
//关闭自动确认消息
channel.basicConsume(QUEUE_NAME, false, deliverCallback, consumerTag -> { });
}
}
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轮训策略验证
- 先启动两个消费者，再启动生产者
- 缺点：存在部分节点消费过快，部分节点消费慢，导致不能合理处理消息
第4集 玩转RabbitMQ工作队列 公平策略实战
简介：RabbitMQ工作队列 公平策略讲解实战
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公平策略验证
- 修改消费者策略
- 解决消费者能力消费不足的问题，降低消费时间问题
