RabbitMQ c#版实现（转）

出处：https://www.cnblogs.com/hanfan/p/9842301.html

网上很多人已经总结的很好了，比如今天看到的这个。https://www.cnblogs.com/LipeiNet/p/9877189.html

我就不总结了，贴点代码。

RabbitMQConnect.cs

using System;
using System.IO;
using System.Net.Sockets;
using Polly;
using Polly.Retry;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using RabbitMQ.Client.Exceptions;
 
namespace Common.Tool.RabbitMQ
{
    public class RabbitMQConnect
    {
         
        static string host = "127.0.0.1";
        static string UserName = "H";
        static string password = "H";
 
        public readonly static IConnectionFactory _connectionFactory;
        IConnection _connection;
        object sync_root = new object();
        bool _disposed;
        static RabbitMQConnect()
        {
            //if (host == "localhost")
            //{
            //    _connectionFactory = new ConnectionFactory() { HostName = host };
            //}
            //else
            {
                _connectionFactory = new ConnectionFactory() { HostName = host, UserName = UserName, Password = password };
            }
        }
        public bool IsConnected => this._connection != null && this._connection.IsOpen && this._disposed;
        public IModel CreateModel()
        {
            if (!this.IsConnected)
            {
                this.TryConnect();
            }
            return this._connection.CreateModel();
        }
        public bool TryConnect()
        {
            lock (this.sync_root)
            {
                RetryPolicy policy = RetryPolicy.Handle<SocketException>()//如果我们想指定处理多个异常类型通过OR即可
                    .Or<BrokerUnreachableException>()//ConnectionFactory.CreateConnection期间无法打开连接时抛出异常
                    .WaitAndRetry(5, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
                        {
 
                        });// 重试次数，提供等待特定重试尝试的持续时间的函数，每次重试时调用的操作。
                policy.Execute(() =>
                {
                    this._connection = _connectionFactory.CreateConnection();
 
                });
 
                if (this.IsConnected)
                {
                    //当连接被破坏时引发。如果在添加事件处理程序时连接已经被销毁对于此事件，事件处理程序将立即被触发。
                    this._connection.ConnectionShutdown += this.OnConnectionShutdown;
                    //在连接调用的回调中发生异常时发出信号。当ConnectionShutdown处理程序抛出异常时，此事件将发出信号。如果将来有更多的事件出现在RabbitMQ.Client.IConnection上，那么这个事件当这些事件处理程序中的一个抛出异常时，它们将被标记。
                    this._connection.CallbackException += this.OnCallbackException;
                    this._connection.ConnectionBlocked += this.OnConnectionBlocked;
 
                    //LogHelperNLog.Info($"RabbitMQ persistent connection acquired a connection {_connection.Endpoint.HostName} and is subscribed to failure events");
 
                    return true;
                }
                else
                {
                    // LogHelperNLog.Info("FATAL ERROR: RabbitMQ connections could not be created and opened");
 
                    return false;
                }
            }
        }
 
        void OnConnectionShutdown(object sender, ShutdownEventArgs reason)
        {
            if (this._disposed) return;
            //RabbitMQ连接正在关闭。 尝试重新连接...
            //LogHelperNLog.Info("A RabbitMQ connection is on shutdown. Trying to re-connect...");
 
            this.TryConnect();
        }
        /// <summary>
        ///   
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void OnCallbackException(object sender, CallbackExceptionEventArgs e)
        {
            if (this._disposed) return;
 
            // LogHelperNLog.Info("A RabbitMQ connection throw exception. Trying to re-connect...");
 
            this.TryConnect();
        }
        private void OnConnectionBlocked(object sender, ConnectionBlockedEventArgs e)
        {
            if (this._disposed) return;
 
            //  LogHelperNLog.Info("A RabbitMQ connection is shutdown. Trying to re-connect...");
 
            this.TryConnect();
        }
 
        public void Dispose()
        {
            if (this._disposed) return;
 
            this._disposed = true;
 
            try
            {
                this._connection.Dispose();
            }
            catch (IOException ex)
            {
                //_logger.LogCritical(ex.ToString());
                //  LogHelperNLog.Error(ex);
            }
        }
    }
}

RabbitMQSend.cs

using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.Text;
 
namespace Common.Tool.RabbitMQ
{
    public  class RabbitMQSend
    {
        /// <summary>
        /// Newtonsoft.Json利用IsoDateTimeConverter处理日期类型
        /// </summary>
        static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
        static RabbitMQConnect connection=null;
 
        static RabbitMQSend()
        {
            connection = new RabbitMQConnect();
        }
 
        /// <summary>
        /// 添加信息到队列
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="item">信息</param>
        /// <param name="queueName">队列名</param>
        public static void PushMsgToMq<T>(T item, string queueName)
        {
            string msg = JsonConvert.SerializeObject(item, dtConverter);
            using (global::RabbitMQ.Client.IModel channel = connection.CreateModel())
            {
                channel.QueueDeclare(queue: queueName,
                    durable: true,
                    exclusive: false,
                    autoDelete: false,
                    arguments: null);
                //Construct a completely empty content header for use with the Basic content class.
                //构造一个完全空的内容标头，以便与Basic内容类一起使用。
                global::RabbitMQ.Client.IBasicProperties properties = channel.CreateBasicProperties();
                properties.Persistent = true;
                byte[] body = Encoding.UTF8.GetBytes(msg);
                channel.BasicPublish(exchange: "",
                    routingKey: queueName,
                    basicProperties: properties,
                    body: body);
            }
        }
    }
}

RabbitMQReceive.cs

using Newtonsoft.Json;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Text;
 
namespace Common.Tool.RabbitMQ
{
    public class RabbitMQReceive : IDisposable
    {
        IConnection connection = null;
        IModel channel = null;
 
        public void BindReceiveMqMsg<T>(Func<T, bool> func, Action<string> log, string queueName)
        {
            this.connection = RabbitMQConnect._connectionFactory.CreateConnection();//创建与指定端点的连接。
            this.channel = this.connection.CreateModel(); //创建并返回新的频道，会话和模型。
            this.channel.QueueDeclare(queue: queueName,//队列名称
                             durable: true,//是否持久化, 队列的声明默认是存放到内存中的，如果rabbitmq重启会丢失，如果想重启之后还存在就要使队列持久化，保存到Erlang自带的Mnesia数据库中，当rabbitmq重启之后会读取该数据库
                             exclusive: false,//是否排外的，有两个作用，一：当连接关闭时connection.close()该队列是否会自动删除；二：该队列是否是私有的private，如果不是排外的，可以使用两个消费者都访问同一个队列，没有任何问题，如果是排外的，会对当前队列加锁，其他通道channel是不能访问的，如果强制访问会报异常：com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=405, reply-text=RESOURCE_LOCKED - cannot obtain exclusive access to locked queue 'queue_name' in vhost '/', class-id=50, method-id=20)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: false,//是否自动删除，当最后一个消费者断开连接之后队列是否自动被删除，可以通过RabbitMQ Management，查看某个队列的消费者数量，当consumers = 0时队列就会自动删除
                             arguments: null);//队列中的消息什么时候会自动被删除？
 
            this.channel.BasicQos(prefetchSize: 0, prefetchCount: 1, global: false);//（Spec方法）配置Basic内容类的QoS参数。
                                                                                    //第一个参数是可接收消息的大小的  0不受限制
                                                                                    //第二个参数是处理消息最大的数量  1 那如果接收一个消息，但是没有应答，则客户端不会收到下一个消息，消息只会在队列中阻塞
                                                                                    //第三个参数则设置了是不是针对整个Connection的，因为一个Connection可以有多个Channel，如果是false则说明只是针对于这个Channel的。
            EventingBasicConsumer consumer = new EventingBasicConsumer(this.channel);//构造函数，它将Model属性设置为给定值。
            consumer.Received += (model, bdea) =>
            {
                byte[] body = bdea.Body;
                string message = Encoding.UTF8.GetString(body);
                log?.Invoke(message);
 
                T item = JsonConvert.DeserializeObject<T>(message);
                bool result = func(item);
                if (result)
                {
                    //（Spec方法）确认一个或多个已传送的消息。
                    this.channel.BasicAck(deliveryTag: bdea.DeliveryTag, multiple: false);
                }
            };
            this.channel.BasicConsume(queue: queueName, noAck: false, consumer: consumer); //The consumer is started with noAck = false(i.e.BasicAck is required), an empty consumer tag (i.e. the server creates and returns a fresh consumer tag), noLocal=false and exclusive=false.
        }
        public void Dispose()
        {
            if (this.channel != null)
            {
                this.channel.Close();
            }
 
            if (this.connection != null)
            {
                this.connection.Close();
            }
        }
    }
}