RabbitMQ模式の工作队列模式
1、说明
一个生产者,多个消费者,每个消费者获取到的消息唯一,多个消费者只有一个队列
任务队列:避免立即做一个资源密集型任务,必须等待它完成,而是把这个任务安排到稍后再做。我们将任务封装为消息并将其发送给队列。后台运行的工作进程将弹出任务并最终执行作业。当有多个worker同时运行时,任务将在它们之间共享。
2、模型
3、示例代码
3.1、生成者
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.TimeoutException;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.apache.commons.lang3.StringUtils.EMPTY;
public class Publisher {
private static final String MQ_VIRTUAL_HOST = "VHOST::TUTORIAL";
private static final String MQ_QUEUE_NAME = "QUEUE::TUTORIAL";
public static void main(String[] args) {
Connection connection = null;
Channel channel = null;
try {
final ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
factory.setUsername("admin");
factory.setPassword("romens");
factory.setVirtualHost(MQ_VIRTUAL_HOST);
connection = factory.newConnection();
channel = connection.createChannel();
channel.basicPublish(EMPTY, MQ_QUEUE_NAME, null, "Hello Kitty".getBytes(UTF_8));
} catch (IOException | TimeoutException e) {
e.printStackTrace();
} finally {
if (Objects.nonNull(channel)) {
try {
channel.close();
} catch (IOException | TimeoutException e) {
e.printStackTrace();
}
}
if (Objects.nonNull(connection)) {
try {
connection.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
3.2、消费者
3.2.1、消费者A
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.TimeoutException;
import static java.nio.charset.StandardCharsets.UTF_8;
public class ConsumerA {
private static final String MQ_VIRTUAL_HOST = "VHOST::TUTORIAL";
private static final String MQ_QUEUE_NAME = "QUEUE::TUTORIAL";
public static void main(String[] args) {
Connection connection = null;
Channel channel = null;
try {
final ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
factory.setUsername("admin");
factory.setPassword("romens");
factory.setVirtualHost(MQ_VIRTUAL_HOST);
connection = factory.newConnection();
channel = connection.createChannel();
// 同一时刻服务器只发送一条消息给消费者,来保证资源的合理利用
channel.basicQos(1);
System.out.println("[*] Waiting for messages. To exits press CTRL+C");
final DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
System.out.println(" [X] Received '" + new String(body, UTF_8) + "'");
}
};
channel.basicConsume(MQ_QUEUE_NAME, true, consumer);
while (true) {
synchronized (consumer) {
try {
consumer.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
} catch (IOException | TimeoutException e) {
e.printStackTrace();
} finally {
if (Objects.nonNull(channel)) {
try {
channel.close();
} catch (IOException | TimeoutException e) {
e.printStackTrace();
}
}
if (Objects.nonNull(connection)) {
try {
connection.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
3.2.2、消费者B
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.TimeoutException;
import static java.nio.charset.StandardCharsets.UTF_8;
public class ConsumerB {
private static final String MQ_VIRTUAL_HOST = "VHOST::TUTORIAL";
private static final String MQ_QUEUE_NAME = "QUEUE::TUTORIAL";
public static void main(String[] args) {
Connection connection = null;
Channel channel = null;
try {
final ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
factory.setUsername("admin");
factory.setPassword("romens");
factory.setVirtualHost(MQ_VIRTUAL_HOST);
connection = factory.newConnection();
channel = connection.createChannel();
// 同一时刻服务器只发送一条消息给消费者,来保证资源的合理利用
channel.basicQos(1);
System.out.println("[*] Waiting for messages. To exits press CTRL+C");
final DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
System.out.println(" [X] Received '" + new String(body, UTF_8) + "'");
}
};
channel.basicConsume(MQ_QUEUE_NAME, true, consumer);
while (true) {
synchronized (consumer) {
try {
consumer.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
} catch (IOException | TimeoutException e) {
e.printStackTrace();
} finally {
if (Objects.nonNull(channel)) {
try {
channel.close();
} catch (IOException | TimeoutException e) {
e.printStackTrace();
}
}
if (Objects.nonNull(connection)) {
try {
connection.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
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薔薇猛虎皆成個性,陽光雨露俱是天恩!
薔薇猛虎皆成個性,陽光雨露俱是天恩!