RabbitMQ学习之fanout模型

最新推荐文章于 2024-06-27 10:30:09 发布

YellowSubject

最新推荐文章于 2024-06-27 10:30:09 发布

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分类专栏： MQ 文章标签： java

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扇出模型
继续熟悉RabbitMQ的模型图：
在这里插入图片描述
fanout 扇出也称为广播`

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-cE2EaHoe-1611750071500)(RibbitMQ 实战教程.assets/image-20191126213115873.png)]

在广播模式下，消息发送流程是这样的：

可以有多个消费者
每个消费者有自己的queue（队列）
每个队列都要绑定到Exchange（交换机）
生产者发送的消息，只能发送到交换机，交换机来决定要发给哪个队列，生产者无法决定。
交换机把消息发送给绑定过的所有队列
队列的消费者都能拿到消息。实现一条消息被多个消费者消费

代码

生产者

public class Provider {
    public static void main(String[] args) throws IOException {
        //获取连接对象
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        //将通道声明指定交换机 参数1：交换机名称 参数2：交换机类型 fanout 广播类型
        channel.exchangeDeclare("logs","fanout");
        //发送消息
        channel.basicPublish("logs","",null,"fanout type message".getBytes());
        //关闭连接
        RabbitMQUtils.closeConnectionAndChanel(channel,connection);
    }
}

消费者

public class Customer1 {
    public static void main(String[] args) throws IOException {
        //获取连接对象
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        //通道绑定交换机
        channel.exchangeDeclare("logs","fanout");
        //临时队列
        String queueName = channel.queueDeclare().getQueue();
        //绑定交换机和队列
        channel.queueBind(queueName,"logs","");
        //消费消息
        channel.basicConsume(queueName,true,new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                System.out.println("消费者1"+new String(body));
            }
        });
    }
}

消费者2

public class Customer2 {
    public static void main(String[] args) throws IOException {
        //获取连接对象
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        //通道绑定交换机
        channel.exchangeDeclare("logs","fanout");
        //临时队列
        String queueName = channel.queueDeclare().getQueue();
        //绑定交换机和队列
        channel.queueBind(queueName,"logs","");
        //消费消息
        channel.basicConsume(queueName,true,new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                System.out.println("消费者2"+new String(body));
            }
        });
    }
}

消费者3

public class Customer3 {
    public static void main(String[] args) throws IOException {
        //获取连接对象
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        //通道绑定交换机
        channel.exchangeDeclare("logs","fanout");
        //临时队列
        String queueName = channel.queueDeclare().getQueue();
        //绑定交换机和队列
        channel.queueBind(queueName,"logs","");
        //消费消息
        channel.basicConsume(queueName,true,new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                System.out.println("消费者3"+new String(body));
            }
        });
    }
}

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