RabbitMQ实现Work Queue工作队列的示例详解
RabbitMQ是一个开源的消息队列系统,支持多种消息递协议。在使用RabbitMQ时,可以使用Work Queue工作队列来实现任务的异步处理。本文将介绍如何使用RabbitMQ实现Work Queue工作队列,并提供两个示例说明。
Work Queue工作队列
Work Queue工作队列是一种常见的消息队列模式,也称为任务队列。在Work Queue工作队列中,任务被发送到队列中,然后由多个工作者(Worker)并发地处理任务。每个任务只能被一个工作者处理,确保任务的唯一性和可靠性。
在Work Queue工作队列中,任务的发送者称为生产者(Producer),任务的接收者称为消费者(Consumer)。生产者将任务发送到队列中,消费者从队列中获取任务并处理。如果队列中没有任务,消费者将等待直到有任务可用。
示例说明
示例一:使用RabbitMQ实现Work Queue工作队列
在本示例中,我们将使用RabbitMQ实现Work Queue工作队列。具体步骤如下:
- 创建一个RabbitMQ的生产者并将任务发送到队列中。
- 创建多个RabbitMQ的消费者并从队列中获取任务并处理。
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Text;
using System.Threading;
class Program
{
static void Main(string[] args)
{
// 创建一个RabbitMQ的生产者并将任务发送到队列中
var factory = new ConnectionFactory() { HostName = "localhost" };
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "task_queue",
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
var message = GetMessage(args);
var body = Encoding.UTF8.GetBytes(message);
var properties = channel.CreateBasicProperties();
properties.Persistent = true;
channel.BasicPublish(exchange: "",
routingKey: "task_queue",
basicProperties: properties,
body: body);
Console.WriteLine(" [x] Sent {0}", message);
}
// 创建多个RabbitMQ的消费者并从队列中获取任务并处理
var threads = new Thread[3];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(() =>
{
var factory = new ConnectionFactory() { HostName = "localhost" };
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "task_queue",
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
var body = ea.Body.ToArray();
var message = Encoding.UTF8.GetString(body);
Console.WriteLine(" [x] Received {0}", message);
int dots = message.Split('.').Length - 1;
Thread.Sleep(dots * 1000);
Console.WriteLine(" [x] Done");
channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
};
channel.BasicConsume(queue: "task_queue",
autoAck: false,
consumer: consumer);
Console.WriteLine(" Press [enter] to exit.");
Console.ReadLine();
}
});
threads[i].Start();
}
}
private static string GetMessage(string[] args)
{
return (args.Length > 0) ? string.Join(" ", args) : "Hello World!";
}
}
在上述代码中,我们创建了一个RabbitMQ的生产者并将任务发送到队列中,然后创建了多个RabbitMQ的消费者并从队列中获取任务并处理。
示例二:使用RabbitMQ实现Work Queue工作队列并设置任务优先级
在本示例中,我们将使用RabbitMQ实现Work Queue工作队列并设置任务优先级。具体步骤如下:
- 创建一个RabbitMQ的生产者并将任务发送到队列中,并设置任务的优先级。
- 创建多个RabbitMQ的消费者并从队列中获取任务并处理。
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Text;
using System.Threading;
class Program
{
static void Main(string[] args)
{
// 创建一个RabbitMQ的生产者并将任务发送到队列中,并设置任务的优先级
var factory = new ConnectionFactory() { HostName = "localhost" };
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "task_queue",
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
var message = GetMessage(args);
var body = Encoding.UTF8.GetBytes(message);
var properties = channel.CreateBasicProperties();
properties.Persistent = true;
properties.Priority = 1;
channel.BasicPublish(exchange: "",
routingKey: "task_queue",
basicProperties: properties,
body: body);
Console.WriteLine(" [x] Sent {0}", message);
}
// 创建多个RabbitMQ的消费者并从队列中获取任务并处理
var threads = new Thread[3];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(() =>
{
var factory = new ConnectionFactory() { HostName = "localhost" };
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "task_queue",
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
var body = ea.Body.ToArray();
var message = Encoding.UTF8.GetString(body);
Console.WriteLine(" [x] Received {0}", message);
int dots = message.Split('.').Length - 1;
Thread.Sleep(dots * 1000);
Console.WriteLine(" [x] Done");
channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
};
channel.BasicConsume(queue: "task_queue",
autoAck: false,
consumer: consumer);
Console.WriteLine(" Press [enter] to exit.");
Console.ReadLine();
}
});
threads[i].Start();
}
}
private static string GetMessage(string[] args)
{
return (args.Length > 0) ? string.Join(" ", args) : "Hello World!";
}
}
在上述代码中,我们创建了一个RabbitMQ的生产者并将任务发送到队列中,并设置了任务的优先级,然后创建了多个RabbitMQ的消费者并从队列中获取任务并处理。
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