RabbitMQ的5种消息队列
1、七种模式介绍与应用场景
1.1 简单模式(Hello World)
一个生产者对应一个消费者,RabbitMQ 相当于一个消息代理,负责将 A 的消息转发给 B。
应用场景:将发送的电子邮件放到消息队列,然后邮件服务在队列中获取邮件并发送给收件人。
1.2 工作队列模式(Work queues)
在多个消费者之间分配任务(竞争的消费者模式),一个生产者对应多个消费者,一般适用于执行资源密集型任务,
单个消费者处理不过来,需要多个消费者进行处理。
应用场景:一个订单的处理需要10s,有多个订单可以同时放到消息队列,然后让多个消费者同时处理,这样就是
并行了,而不是单个消费者的串行情况。
1.3 订阅模式(Publish/Subscribe)
一次向许多消费者发送消息,一个生产者发送的消息会被多个消费者获取,也就是将消息将广播到所有的消费者
中。
应用场景:更新商品库存后需要通知多个缓存和多个数据库,这里的结构应该是:
- 一个 fanout 类型交换机扇出两个个消息队列,分别为缓存消息队列、数据库消息队列
- 一个缓存消息队列对应着多个缓存消费者
- 一个数据库消息队列对应着多个数据库消费者
1.4 路由模式(Routing)
有选择地 (Routing key) 接收消息,发送消息到交换机并且要指定路由 key,消费者将队列绑定到交换机时需要指
定路由 key,仅消费指定路由 key 的消息。
应用场景:如在商品库存中增加了 1 台 iphone12,iphone12 促销活动消费者指定 routing key 为 iphone12,只
有此促销活动会接收到消息,其它促销活动不关心也不会消费此 routing key 的消息。
1.5 主题模式(Topics)
根据主题 (Topics) 来接收消息,将路由 key 和某模式进行匹配,此时队列需要绑定在一个模式上,#
匹配一个词
或多个词,*
只匹配一个词。
应用场景:同上 iphone 促销活动可以接收主题为 iphone 的消息,如 iphone12、iphone13 等。
1.6 远程过程调用(RPC)
如果我们需要在远程计算机上运行功能并等待结果就可以使用 RPC,具体流程可以看图。
应用场景:需要等待接口返回数据,如订单支付。
1.7 发布者确认(Publisher Confirms)
与发布者进行可靠的发布确认,发布者确认是 RabbitMQ 扩展,可以实现可靠的发布。在通道上启用发布者确认
后,RabbitMQ 将异步确认发送者发布的消息,这意味着它们已在服务器端处理。
应用场景:对于消息可靠性要求较高,比如钱包扣款。
2、代码演示
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.6.0</version>
</dependency>
2.1 简单模式
package simple;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Sender {
private final static String QUEUE_NAME = "simple_queue";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
// 声明队列
// queue: 队列名
// durable: 是否持久化
// exclusive: 是否排外,即只允许该channel访问该队列,一般等于true的话用于一个队列只能有一个消费者来消费的场景
// autoDelete: 是否自动删除,消费完删除
// arguments: 其他属性
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 消息内容
String message = "simplest mode message";
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
System.out.println("[x]Sent '" + message + "'");
// 最后关闭通关和连接
channel.close();
connection.close();
}
}
package simple;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver {
private final static String QUEUE_NAME = "simple_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
[x]Sent 'simplest mode message'
[x] Received 'simple_queue':'simplest mode message'
2.2 工作队列模式
package work;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver1 {
private final static String QUEUE_NAME = "queue_work";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 同一时刻服务器只会发送一条消息给消费者
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-1] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package work;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver2 {
private final static String QUEUE_NAME = "queue_work";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 同一时刻服务器只会发送一条消息给消费者
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-2] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package work;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Sender {
private final static String QUEUE_NAME = "queue_work";
public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
for (int i = 0; i < 10; i++) {
String message = "work mode message" + i;
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
System.out.println("[x] Sent '" + message + "'");
Thread.sleep(i * 10);
}
channel.close();
connection.close();
}
}
[x] Sent 'work mode message0'
[x] Sent 'work mode message1'
[x] Sent 'work mode message2'
[x] Sent 'work mode message3'
[x] Sent 'work mode message4'
[x] Sent 'work mode message5'
[x] Sent 'work mode message6'
[x] Sent 'work mode message7'
[x] Sent 'work mode message8'
[x] Sent 'work mode message9'
[x-1] Received 'queue_work':'work mode message0'
[x-1] Received 'queue_work':'work mode message2'
[x-1] Received 'queue_work':'work mode message4'
[x-1] Received 'queue_work':'work mode message6'
[x-1] Received 'queue_work':'work mode message8'
[x-2] Received 'queue_work':'work mode message1'
[x-2] Received 'queue_work':'work mode message3'
[x-2] Received 'queue_work':'work mode message5'
[x-2] Received 'queue_work':'work mode message7'
[x-2] Received 'queue_work':'work mode message9'
2.3 发布订阅模式
package publishsubscribe;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
public class Receive1 {
private static final String EXCHANGE_NAME = "logs";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
String queueName = channel.queueDeclare().getQueue();
channel.queueBind(queueName, EXCHANGE_NAME, "");
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
// 订阅消息的回调函数
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-1] Received '" + message + "'");
};
// 消费者,有消息时出发订阅回调函数
channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
});
}
}
package publishsubscribe;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
public class Receive2 {
private static final String EXCHANGE_NAME = "logs";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
String queueName = channel.queueDeclare().getQueue();
channel.queueBind(queueName, EXCHANGE_NAME, "");
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
// 订阅消息的回调函数
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-2] Received2 '" + message + "'");
};
// 消费者,有消息时出发订阅回调函数
channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
});
}
}
package publishsubscribe;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
public class Sender {
private static final String EXCHANGE_NAME = "logs";
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
String message = "publish subscribe message";
channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes("UTF-8"));
System.out.println(" [x] Sent '" + message + "'");
channel.close();
connection.close();
}
}
[x] Sent 'publish subscribe message'
[*] Waiting for messages. To exit press CTRL+C
[x-1] Received 'publish subscribe message'
[*] Waiting for messages. To exit press CTRL+C
[x-2] Received2 'publish subscribe message'
2.4 路由模式
package router;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver1 {
private final static String QUEUE_NAME = "queue_routing";
private final static String EXCHANGE_NAME = "exchange_direct";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 指定路由的key,接收key和key2
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key");
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-1] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package router;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver2 {
private final static String QUEUE_NAME = "queue_routing2";
private final static String EXCHANGE_NAME = "exchange_direct";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 仅接收key2
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-2] Received '" +
delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package router;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Sender {
private final static String EXCHANGE_NAME = "exchange_direct";
private final static String EXCHANGE_TYPE = "direct";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
// 交换机声明
channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);
// 只有routingKey相同的才会消费
String message = "routing mode message";
channel.basicPublish(EXCHANGE_NAME, "key2", null, message.getBytes());
System.out.println("[x] Sent '" + message + "'");
// channel.basicPublish(EXCHANGE_NAME, "key", null, message.getBytes());
// System.out.println("[x] Sent '" + message + "'");
channel.close();
connection.close();
}
}
[x] Sent 'routing mode message'
[x-1] Received 'key2':'routing mode message'
[x-2] Received 'key2':'routing mode message'
2.5 主题模式
package topic;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver1 {
private final static String QUEUE_NAME = "queue_topic";
private final static String EXCHANGE_NAME = "exchange_topic";
public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 可以接收key.1
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key.*");
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-1] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package topic;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Receiver2 {
private final static String QUEUE_NAME = "queue_topic2";
private final static String EXCHANGE_NAME = "exchange_topic";
private final static String EXCHANGE_TYPE = "topic";
public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// *号代表单个单词,可以接收key.1
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.*");
// #号代表多个单词,可以接收key.1.2
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.#");
channel.basicQos(1);
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x-2] Received '" + delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
};
channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
});
}
}
package topic;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Sender {
private final static String EXCHANGE_NAME = "exchange_topic";
private final static String EXCHANGE_TYPE = "topic";
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);
String message = "topics model message with key.1";
channel.basicPublish(EXCHANGE_NAME, "key.1", null, message.getBytes());
System.out.println("[x] Sent '" + message + "'");
String message2 = "topics model message with key.1.2";
channel.basicPublish(EXCHANGE_NAME, "key.1.2", null, message2.getBytes());
System.out.println("[x] Sent '" + message2 + "'");
channel.close();
connection.close();
}
}
[x] Sent 'topics model message with key.1'
[x] Sent 'topics model message with key.1.2'
[x-1] Received 'key.1':'topics model message with key.1'
[x-2] Received 'key.1':'topics model message with key.1'
[x-2] Received 'key.1.2':'topics model message with key.1.2'
3、四种交换机介绍
-
直连交换机( Direct exchange ):具有路由功能的交换机,绑定到此交换机的时候需要指定一个
routing_key,交换机发送消息的时候需要 routing_key,会将消息发送道对应的队列。
-
扇形交换机( Fanout exchange ):广播消息到所有队列,没有任何处理,速度最快。
-
主题交换机( Topic exchange ):在直连交换机基础上增加模式匹配,也就是对 routing_key 进行模式匹配,
*
代表一个单词,#
代表多个单词。 -
首部交换机( Headers exchange ):忽略 routing_key,使用 Headers 信息(一个 Hash 的数据结构)进行匹
配,优势在于可以有更多更灵活的匹配规则。