RabbitMQ操作代码封装

1、RabbitMqPublisher.cs （发送消息）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RabbitMQ.Client;

namespace X.RabbitMQ
{
    public class RabbitMqPublisher
    {
        private readonly string _rabbitMqUri;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="rabbitMqUri">连接串,如 amqp://guest:guest@localhost:5672/</param>
        public RabbitMqPublisher(string rabbitMqUri)
        {
            this._rabbitMqUri = rabbitMqUri;
        }

        /// <summary>
        /// 创建连接
        /// </summary>
        private IConnection CreateConnection()
        {
            var factory = new ConnectionFactory
            {
                Uri = new Uri(_rabbitMqUri)
            };

           return factory.CreateConnection();
        }

        /// <summary>
        /// 创建信道
        /// </summary>
        private IModel CreateChannel(IConnection con, string exchangeName, string exchangeType, string queueName, string routeKey)
        {
            var channel = con.CreateModel();
            channel.ExchangeDeclare(exchangeName, exchangeType, true, false, null);
            if (!string.IsNullOrEmpty(queueName))
            {
                channel.QueueDeclare(queueName, true, false, false, null); //创建一个消息队列，用来存储消息
                channel.QueueBind(queueName, exchangeName, routeKey, null);
            }
           
            channel.BasicQos(0, 3, true); //在非自动确认消息的前提下，如果一定数目的消息（通过基于consume或者channel设置Qos的值）未被确认前，不进行消费新的消息
            return channel;
        }

        /// <summary>
        /// 发送ExchangeType类型为Direct的消息
        /// </summary>
        /// <param name="exchangeName">交换机名称</param>
        /// <param name="routeKey">消息路由key</param>
        /// <param name="message">消息实体</param>
        /// <param name="queueName">缺省队列名（不存在则自动创建），设置后可避免消息发送后由于没有队列接收而丢失的问题</param>
        /// <returns></returns>
        public bool PublishDirectMessage(string exchangeName, string routeKey, string message, string queueName = "")
        {
            return this.PublishMessage(exchangeName, ExchangeType.Direct, queueName, routeKey, new[] { message });
        }

        /// <summary>
        /// 批量发送ExchangeType类型为Direct的消息
        /// </summary>
        /// <param name="exchangeName">交换机名称</param>
        /// <param name="routeKey">消息路由key</param>
        /// <param name="messages">消息实体</param>
        /// <param name="queueName">缺省队列名（不存在则自动创建），设置后可避免消息发送后由于没有队列接收而丢失的问题</param>
        /// <returns></returns>
        public bool PublishDirectMessages(string exchangeName, string routeKey, IEnumerable<string> messages, string queueName = "")
        {
            return this.PublishMessage(exchangeName, ExchangeType.Direct, queueName, routeKey, messages);
        }

        /// <summary>
        /// 发送ExchangeType类型为Fanout的消息
        /// </summary>
        /// <param name="exchangeName">交换机名称</param>
        /// <param name="message">消息实体</param>
        /// <param name="queueName">缺省队列名（不存在则自动创建），设置后可避免消息发送后由于没有队列接收而丢失的问题</param>
        /// <returns></returns>
        public bool PublishFanoutMessage(string exchangeName, string message, string queueName = "")
        {
            return this.PublishMessage(exchangeName, ExchangeType.Fanout, queueName, "", new[] { message });
        }

        /// <summary>
        /// 批量发送ExchangeType类型为Fanout的消息
        /// </summary>
        /// <param name="exchangeName">交换机名称</param>
        /// <param name="messages">消息实体</param>
        /// <param name="queueName">缺省队列名（不存在则自动创建），设置后可避免消息发送后由于没有队列接收而丢失的问题</param>
        /// <returns></returns>
        public bool PublishFanoutMessages(string exchangeName, IEnumerable<string> messages, string queueName = "")
        {
            return this.PublishMessage(exchangeName, ExchangeType.Fanout, queueName, "", messages);
        }

        private bool PublishMessage(string exchangeName, string exchangeType, string queueName, string routeKey, IEnumerable<string> messages)
        {
            using (var con = CreateConnection())
            {
                using (var channel = CreateChannel(con, exchangeName, exchangeType, queueName, routeKey))
                {
                    channel.ConfirmSelect();//启用消息发送确认机制

                    foreach (var message in messages)
                    {
                        var body = Encoding.UTF8.GetBytes(message);
                        var properties = channel.CreateBasicProperties();
                        properties.Persistent = true; //使消息持久化
                        channel.BasicPublish(exchangeName, routeKey, properties, body);
                    }
                  
                    return channel.WaitForConfirms();
                }
            }
        }
    }
}

2、RabbitMqQuery.cs （队列消息拉取）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RabbitMQ.Client;

namespace X.RabbitMQ
{
    public class RabbitMqQuery
    {
        private readonly string _rabbitMqUri;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="rabbitMqUri">连接串,如 amqp://guest:guest@localhost:5672/</param>
        public RabbitMqQuery(string rabbitMqUri)
        {
            this._rabbitMqUri = rabbitMqUri;
        }

        /// <summary>
        /// 创建连接
        /// </summary>
        private IConnection CreateConnection()
        {
            var factory = new ConnectionFactory
            {
                Uri = new Uri(_rabbitMqUri)
            };

           return factory.CreateConnection();
        }

        /// <summary>
        /// 拉取队列中的数据
        /// </summary>
        /// <param name="queueName">队列名</param>
        /// <returns></returns>
        public string GetMessage(string queueName)
        {
            using (var con = this.CreateConnection())
            {
                var channel = con.CreateModel();
                var rs = channel.BasicGet(queueName, true);
                if (rs != null)
                {
                    var body = rs.Body;
                    return Encoding.UTF8.GetString(body);
                }
                return "";
            } 
        }

        /// <summary>
        /// 批量拉取队列中的数据
        /// </summary>
        /// <param name="queueName">队列名</param>
        /// <param name="queryCount">拉取数据的条数，默认为1</param>
        /// <returns></returns>
        public string[] GetMessages(string queueName, int queryCount = 1)
        {
            if (queryCount <= 0){ queryCount = 1; }

            var msgLst = new List<string>();
            using (var con = this.CreateConnection())
            {
                var channel = con.CreateModel();
                for (int i = 0; i < queryCount; i++)
                {
                    var rs = channel.BasicGet(queueName, true);
                    if (rs != null)
                    {
                        var body = rs.Body;
                        msgLst.Add(Encoding.UTF8.GetString(body));
                    }
                    else
                    {
                        break;
                    }
                } 
            }

            return msgLst.ToArray();
        }
    }
}

3、RabbitMqListener.cs （消息监听与推送）

using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using RabbitMQ.Client.Exceptions;
using X.Log;

namespace X.RabbitMQ
{
    /// <summary>
    /// RabbitMq消息监听器
    /// </summary>
    public class RabbitMqListener : IDisposable
    {
        private ConnectionFactory _factory;
        private IConnection _con;
        private IModel _channel;
        private EventingBasicConsumer _consumer;

        private readonly string _rabbitMqUri;
        private readonly string _exchangeType;
        private readonly string _exchangeName;
        private readonly string _queueName;
        private readonly string _routeKey;
        private Func<string, bool> _messageHandler;

        /// <summary>
        /// 释放标记
        /// </summary>
        private bool disposed;

        ~RabbitMqListener()
        {
            Dispose(false);
        }

        /// <summary>
        /// RabbitMQ消息监听器，若指定的队列不存在，则自动创建队列。并在消息交换机上绑定指定的消息路由规则（路由key）
        /// </summary>
        /// <param name="rabbitMqUri">连接串,如 amqp://guest:guest@localhost:5672/</param>
        /// <param name="exchangeName">消息交换机</param>
        /// <param name="exchangeType">交换机类型，如 ExchangeType.Direct</param>
        /// <param name="queueName">要监听的队列</param>
        /// <param name="routeKey">消息路由key</param>
        public RabbitMqListener(string rabbitMqUri, string exchangeName, string exchangeType, string queueName, string routeKey = "")
        {
            this._rabbitMqUri = rabbitMqUri;
            this._exchangeName = exchangeName;
            this._exchangeType = exchangeType;
            this._queueName = queueName;
            this._routeKey = routeKey;
        }

        /// <summary>
        /// 创建连接
        /// </summary>
        private void CreateConnection()
        {
            _factory = new ConnectionFactory
            {
                Uri = new Uri(_rabbitMqUri),
                RequestedHeartbeat = 20,//与服务器协商使用的心跳超时间隔(以秒为单位)。
                AutomaticRecoveryEnabled = true,//开启网络异常重连机制
                NetworkRecoveryInterval = TimeSpan.FromSeconds(10),//设置每10s重连一次网络
                TopologyRecoveryEnabled = true //开启重连后恢复拓扑(交换,队列,绑定等等)。
            };

            _con = _factory.CreateConnection();
            _con.ConnectionShutdown += (_sender, _e) => ReMessageListen();//掉线重新连接并监听队列消息
        }

        /// <summary>
        /// 创建信道
        /// </summary>
        private void CreateChannel()
        {
            _channel = _con.CreateModel();
            _channel.ExchangeDeclare(_exchangeName, _exchangeType, true, false, null);
            _channel.QueueDeclare(_queueName, true, false, false, null); //创建一个消息队列，用来存储消息
            _channel.QueueBind(_queueName, _exchangeName, _routeKey, null);
            _channel.BasicQos(0, 3, true); //在非自动确认消息的前提下，如果一定数目的消息（通过基于consume或者channel设置Qos的值）未被确认前，不进行消费新的消息
        }

        /// <summary>
        /// 监听队列消息
        /// </summary>
        /// <param name="messageHandler">消息处理器，当监测到队列消息时回调该处理器</param>
        /// <returns>监听状态</returns>
        public bool MessageListen(Func<string, bool> messageHandler)
        {
            try
            {
                this.CreateConnection();
                this.CreateChannel();

                _consumer = new EventingBasicConsumer(_channel); //基于事件的消息推送方式
                _consumer.Received += (_sender, _e) =>
                {
                    string msg = Encoding.UTF8.GetString(_e.Body);
                    if (messageHandler != null)
                    {
                        this._messageHandler = messageHandler;
                        try
                        {
                            var isOk = this._messageHandler(msg);
                            if (isOk)
                            {
                                _channel.BasicAck(_e.DeliveryTag, false);
                            }
                        }
                        catch (Exception ex)
                        {
                            LoggerManager.ErrorLog.Error("消息处理器执行异常：" + ex.Message, ex);
                        } 
                    }
                };

                _channel.BasicConsume(_queueName, false, _consumer); //手动确认
                return true;
            }
            catch (Exception ex)
            {
                LoggerManager.ErrorLog.Error("尝试监听队列消息出现错误：" + ex.Message, ex);
            }
            return false;
        }

        private void ReMessageListen()
        {
            try
            {
                //清除连接及频道
                CleanupResource();

                var mres = new ManualResetEventSlim(false); //初始化状态为false
                while (!mres.Wait(3000)) //每3秒监测一次状态，直到状态为true
                {
                    if (MessageListen(_messageHandler))
                    {
                        mres.Set(); //设置状态为true并跳出循环
                    }
                }
            }
            catch (Exception ex)
            {
                LoggerManager.ErrorLog.Error("尝试连接RabbitMQ服务器出现错误：" + ex.Message, ex);
            }
        }

        /// <summary>
        /// 清理资源
        /// </summary>
        private void CleanupResource()
        {
            if (_channel != null && _channel.IsOpen)
            {
                try
                {
                    _channel.Close();
                }
                catch (Exception ex)
                {
                    LoggerManager.ErrorLog.Error("尝试关闭RabbitMQ信道遇到错误", ex);
                }
                _channel = null;
            }

            if (_con != null && _con.IsOpen)
            {
                try
                {
                    _con.Close();
                }
                catch (Exception ex)
                {
                    LoggerManager.ErrorLog.Error("尝试关闭RabbitMQ连接遇到错误", ex);
                }
                _con = null;
            }
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposed)
            {
                return;
            }
            CleanupResource();
            disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
    }
}

 4、RabbitMQ.Test（测试代码）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RabbitMQ.Client;

namespace X.RabbitMQ.Test
{
    class Program
    {
        private const string RabbitHostUri = "amqp://guest:guest@localhost:5672/";
        private const string ExchangeName = "x.mq.test";
        private const string QueueName = "x.mq.test.queue";
        private const string RouteKey = "x.mq.test.key";

        static void Main(string[] args)
        {
            var publkisher = new X.RabbitMQ.RabbitMqPublisher(RabbitHostUri);
            var isOk = publkisher.PublishDirectMessage(ExchangeName, RouteKey, "hello...");
            isOk = publkisher.PublishDirectMessage(ExchangeName, RouteKey, "ggggggg.");
            Console.WriteLine(isOk ? "is ok" : "is not ok");
            Console.ReadKey();

            var mqQuery = new X.RabbitMQ.RabbitMqQuery(RabbitHostUri);
            var ss = mqQuery.GetMessages(QueueName, 10);
            foreach (var s in ss)
            {
                Console.WriteLine(s);
            }
            
            Console.ReadKey();

            using (var mqListener = new X.RabbitMQ.RabbitMqListener(RabbitHostUri, ExchangeName, "direct", QueueName, RouteKey))
            {
                mqListener.MessageListen(msg =>
                {
                    Console.WriteLine(msg);
                    return true;
                });

                Console.WriteLine("按任意键退出程序...");
                Console.ReadKey();
            }
        }
    }
}