IBM.WMQ订阅主题，连续获取消息解决办法

去队列里面一直获取消息，一开始想到了两种解决方案：

第一：订阅一次获取一次消息，正常的话每次都能获取到，但是要及时去清理订阅并且时间粒度不好控制

第二：订阅一次，再获取消息这里加死循环，超时MQ已经做了，所以可以不用控制线程等待，获取到消息了以后，直接通过自定义事件的机制去及时处理消息

从最终实验结果来看，第二种是最优的做法，可以做到随时获取到消息，又不占用资源。接下来我把最终的实现代码分享处理，希望对大家有所帮助，有不对的地方，请及时联系我。

订阅主题：

        private IIBMWMQMsgHandler _msgHandler;

        public IBMWMQHelper()
        {
            _msgHandler = new DefaultIBMWMQMsgHandler();
        }

        public IBMWMQHelper(IIBMWMQMsgHandler msgHandler)
        {
            _msgHandler = msgHandler;
        }

/// <summary>
        /// 订阅主题。订阅一次并尝试一直获取消息
        /// </summary>
        public void SubTopic1(string business, bool isGetMsg = true)
        {
            IBMWMQEventSource eventSource = new IBMWMQEventSource();
            IBMWMQMsgEventListener msgEventListener = new IBMWMQMsgEventListener(_msgHandler);
            MQSubscription subs = null;
            try
            {
                //订阅事件
                msgEventListener.Subscribe(eventSource);
                //MQEnvironment.CCSID = 1381;

                using (var mqmgr = MQQueueManager.Connect(IBMWMQConfig.QUEUE_MGR_NAME, MQC.MQCO_NONE, IBMWMQConfig.CHANNEL, IBMWMQConfig.CONNECTION_INFO))
                {
                    subs = new MQSubscription(mqmgr);
                    if (mqmgr.IsConnected)
                    {
                        this.TryAdd(business, subs);

                        int option = MQC.MQSO_CREATE | MQC.MQSO_FAIL_IF_QUIESCING | MQC.MQSO_DURABLE | MQC.MQSO_RESUME;
                        string subName = string.Format(IBMWMQConfig.SUBSCRIPTION_TEMPLATE, business);
                        string topicName = string.Format(IBMWMQConfig.TOPIC_TEMPLATE, business);

                        try
                        {
                            subs.Subscribe(subName, option, topicName);
                        }
                        catch (MQException ex)
                        {
                            string code = ex.Reason.ToString();
                            //引发事件
                            eventSource.RaiseErroeMsgEvent(business, code);
                        }

                        while (isGetMsg)
                        {
                            eventSource.RaiseErroeMsgEvent(business, string.Format("开始尝试获取 {0} 消息...", business));
                            try
                            {
                                MQMessage incoming = new MQMessage()
                                {
                                    CharacterSet = MQC.CODESET_UTF,
                                    Encoding = MQC.MQENC_NORMAL
                                };
                                MQGetMessageOptions gmo = new MQGetMessageOptions();
                                gmo.WaitInterval = 10 * 1000; //MQC.MQWI_UNLIMITED;
                                gmo.Options |= MQC.MQGMO_WAIT;
                                gmo.Options |= MQC.MQGMO_SYNCPOINT;

                                subs.Get(incoming, gmo);
                                string message = incoming.ReadAll();

                                if (!string.IsNullOrEmpty(message))
                                {
                                    //引发事件
                                    eventSource.RaiseNewMsgEvent(business, message);
                                }
                            }
                            catch (MQException ex)
                            {
                                string code = ex.Reason.ToString();
                                //引发事件
                                eventSource.RaiseErroeMsgEvent(business, code);
                            }
                        }
                    }
                }
            }
            catch (MQException e)
            {
                string code = e.Reason.ToString();
                //引发事件
                eventSource.RaiseErroeMsgEvent(business, code);
            }
            finally
            {
                //if (subs != null)
                //{
                //    subs.Close(MQC.MQCO_REMOVE_SUB, closeSubQueue: true, closeSubQueueOptions: MQC.MQCO_NONE);
                //}
            }
        }

或者使用原生方式：

/// <summary>
        /// 订阅主题。订阅一次并尝试一直获取消息（原生）
        /// </summary>
        /// <param name="business"></param
        /// <param name="transportMode"></param>
        /// <param name="durability"></param>
        public void SubTopic2(string business, string transportMode = "managed", string durability = "durable")
        {
            Hashtable properties = new Hashtable();
            MQTopic topic = null;
            IBMWMQEventSource eventSource = new IBMWMQEventSource();
            IBMWMQMsgEventListener msgEventListener = new IBMWMQMsgEventListener(_msgHandler);

            try
            {
                //订阅事件
                msgEventListener.Subscribe(eventSource);
                //MQEnvironment.CCSID = 1381;

                //自动重连
                properties.Add(MQC.CONNECT_OPTIONS_PROPERTY, MQC.MQCNO_RECONNECT_Q_MGR);
                properties.Add(MQC.HOST_NAME_PROPERTY, IBMWMQConfig.CONNECTION_HOST);
                properties.Add(MQC.PORT_PROPERTY, IBMWMQConfig.CONNECTION_PORT);
                properties.Add(MQC.CHANNEL_PROPERTY, IBMWMQConfig.CHANNEL);

                if (transportMode == "managed")
                {
                    properties.Add(MQC.TRANSPORT_PROPERTY, MQC.TRANSPORT_MQSERIES_MANAGED);
                }
                else if (transportMode == "unmanaged")
                {
                    properties.Add(MQC.TRANSPORT_PROPERTY, MQC.TRANSPORT_MQSERIES_CLIENT);
                }

                using (var queueManager = new MQQueueManager(IBMWMQConfig.QUEUE_MGR_NAME, properties))
                {
                    if (queueManager.IsConnected)
                    {
                        int option4Durable = MQC.MQSO_CREATE | MQC.MQSO_FAIL_IF_QUIESCING | MQC.MQSO_DURABLE | MQC.MQSO_RESUME;//持久化订阅
                        int option4NotDurable = MQC.MQSO_CREATE | MQC.MQSO_FAIL_IF_QUIESCING;//非持久化订阅

                        string subName = string.Format(IBMWMQConfig.SUBSCRIPTION_TEMPLATE, business);
                        string topicName = string.Format(IBMWMQConfig.TOPIC_TEMPLATE, business);

                        try
                        {
                            if (durability == "durable")
                            {
                                topic = queueManager.AccessTopic(topicName, null, option4Durable, null, subName);
                            }
                            else
                            {
                                topic = queueManager.AccessTopic(topicName, null, MQC.MQTOPIC_OPEN_AS_SUBSCRIPTION, option4NotDurable);
                            }

                            while (true)
                            {
                                eventSource.RaiseErroeMsgEvent(business, string.Format("开始尝试获取 {0} 消息...", business));
                                try
                                {
                                    MQMessage incoming = new MQMessage()
                                    {
                                        CharacterSet = MQC.CODESET_UTF,
                                        Encoding = MQC.MQENC_NORMAL
                                    };
                                    MQGetMessageOptions gmo = new MQGetMessageOptions();
                                    gmo.WaitInterval = 10 * 1000; //MQC.MQWI_UNLIMITED;
                                    gmo.Options |= MQC.MQGMO_WAIT;
                                    gmo.Options |= MQC.MQGMO_SYNCPOINT;

                                    topic.Get(incoming, gmo);
                                    string message = incoming.ReadString(incoming.MessageLength);

                                    if (!string.IsNullOrEmpty(message))
                                    {
                                        //引发事件
                                        eventSource.RaiseNewMsgEvent(business, message);
                                    }
                                }
                                catch (MQException ex)
                                {
                                    string code = ex.Reason.ToString();
                                    //引发事件
                                    eventSource.RaiseErroeMsgEvent(business, code);
                                }
                            }
                        }
                        catch (MQException ex)
                        {
                            string code = ex.Reason.ToString();
                            //引发事件
                            eventSource.RaiseErroeMsgEvent(business, code);
                        }
                    }
                    else
                    {
                        eventSource.RaiseErroeMsgEvent(business, "连接队列管理器失败！");
                    }
                }
            }
            catch (MQException e)
            {
                string code = e.Reason.ToString();
                //引发事件
                eventSource.RaiseErroeMsgEvent(business, code);
            }
        }

接下来开始自定义事件：

定义事件中心：

public class IBMWMQEventSource
    {
        /// <summary>
        /// 新消息处理委托
        /// </summary>
        /// <param name="business"></param>
        /// <param name="msg"></param>
        public delegate void NewMsgHandler(string business, string msg);
        /// <summary>
        /// 新消息处理事件
        /// </summary>
        public event NewMsgHandler NewMsgEventHandler;

        /// <summary>
        /// 错误消息处理委托
        /// </summary>
        /// <param name="errorCode"></param>
        public delegate void ErrorMsgHandler(string business, string errorCode);
        /// <summary>
        /// 错误消息处理事件
        /// </summary>
        public event ErrorMsgHandler ErrorMsgEventHandler;

        /// <summary>
        /// 引发新消息处理事件的方法
        /// </summary>
        /// <param name="business"></param>
        /// <param name="msg"></param>
        public void RaiseNewMsgEvent(string business, string msg)
        {
            if (NewMsgEventHandler != null)
            {
                NewMsgEventHandler.Invoke(business, msg);
            }
        }

        /// <summary>
        /// 引发错误消息处理事件的方法
        /// </summary>
        /// <param name="business"></param>
        /// <param name="errorCode"></param>
        public void RaiseErroeMsgEvent(string business, string errorCode)
        {
            if (ErrorMsgEventHandler != null)
            {
                ErrorMsgEventHandler.Invoke(business, errorCode);
            }
        }
    }

定义事件监听器：

public class IBMWMQMsgEventListener
    {
        private readonly IIBMWMQMsgHandler _msgHandler;

        public IBMWMQMsgEventListener(IIBMWMQMsgHandler msgHandler)
        {
            _msgHandler = msgHandler;
        }

        /// <summary>
        /// 订阅事件
        /// </summary>
        public void Subscribe(IBMWMQEventSource eventSource)
        {
            eventSource.NewMsgEventHandler += _msgHandler.OnNewMsgHandler;
            eventSource.ErrorMsgEventHandler += _msgHandler.OnErrorMsgHandler;
        }

        /// <summary>
        /// 取消订阅事件
        /// </summary>
        public void UnSubscribe(IBMWMQEventSource eventSource)
        {
            eventSource.NewMsgEventHandler -= _msgHandler.OnNewMsgHandler;
            eventSource.ErrorMsgEventHandler -= _msgHandler.OnErrorMsgHandler;
        }
    }

定义消息处理接口：

public interface IIBMWMQMsgHandler
    {
        /// <summary>
        /// 处理新消息
        /// </summary>
        /// <param name="business">业务代码</param>
        /// <param name="msg">消息包</param>
        void OnNewMsgHandler(string business, string msg);

        /// <summary>
        /// 处理错误消息
        /// </summary>
        /// <param name="business">业务代码</param>
        /// <param name="errorCode">错误码</param>
        void OnErrorMsgHandler(string business, string errorCode);
    }

默认消息处理机制：

public class DefaultIBMWMQMsgHandler : IIBMWMQMsgHandler
    {
        /// <summary>
        /// 处理新消息
        /// </summary>
        /// <param name="business">业务代码</param>
        /// <param name="msg">消息包</param>
        public void OnNewMsgHandler(string business, string msg)
        {
            Trace.WriteLine(string.Format("新消息到达，数据包：{0}", msg));
        }

        /// <summary>
        /// 处理错误消息
        /// </summary>
        /// <param name="business">业务代码</param>
        /// <param name="errorCode">错误码</param>
        public void OnErrorMsgHandler(string business, string errorCode)
        {
            Trace.WriteLine(string.Format("处理错误消息，错误码：{0}", errorCode));
        }
    }

定义消息处理方法：

public class CustomIBMWMQMsgHandler : BaseJobManager, IIBMWMQMsgHandler
    {
        /// <summary>
        /// 消息自定义业务处理
        /// </summary>
        private static CustomBusinessHandler customBusinessHandler = new CustomBusinessHandler();

        /// <summary>
        /// 处理新消息
        /// </summary>
        /// <param name="business"></param>
        /// <param name="msg"></param>
        public void OnNewMsgHandler(string business, string msg)
        {
            //获取配置文件
            List<JobConfigEntity> configs = InitJobConfig();
            string businessName = configs.First(c => c.JobName.Replace("_", "").Contains(business)).Name;

            switch (business)
            {
                case IBMWMQConfig.BUSINESS_NAME_ZDFZ09:
                    msg = customBusinessHandler.RemoveMsgHeader(msg, IBMWMQConfig.BUSINESS_NAME_ZDF_Z09);
                    customBusinessHandler.DO_ZDF_Z09(business, msg);
                    break;
                case IBMWMQConfig.BUSINESS_NAME_ZAPZ10:
                    msg = customBusinessHandler.RemoveMsgHeader(msg, IBMWMQConfig.BUSINESS_NAME_ZAP_Z10);
                    customBusinessHandler.DO_ZAP_Z10(business, msg);
                    break;
                case IBMWMQConfig.BUSINESS_NAME_OULR24:
                    msg = customBusinessHandler.RemoveMsgHeader(msg, IBMWMQConfig.BUSINESS_NAME_OUL_R24);
                    customBusinessHandler.DO_OUL_R24(business, msg);
                    break;
            }

            this.WriteInfo(this.GetType(), string.Format("收到来自{0}的消息，数据包：{1}", businessName, msg));
        }

        /// <summary>
        /// 处理错误消息
        /// </summary>
        /// <param name="business"></param>
        /// <param name="errorCode"></param>
        public void OnErrorMsgHandler(string business, string errorCode)
        {
            if (!string.IsNullOrEmpty(errorCode))
            {
                //获取配置文件
                List<JobConfigEntity> configs = InitJobConfig();
                string businessName = configs.First(c => c.JobName.Replace("_", "").Contains(business)).Name;

                //TODO 其他消息内容校验
                if (errorCode.Equals("2033"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_NO_MSG_AVAILABLE.{0} 无消息（{1}）。", businessName, errorCode));
                }
                else if (errorCode.Equals("2085"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_UNKNOWN_OBJECT_NAME.{0} 主题不存在（{1}）。", businessName, errorCode));
                }
                else if (errorCode.Equals("2429"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_SUBSCRIPTION_IN_USE.{0} 主题已被订阅（{1}）。", businessName, errorCode));
                }
                else if (errorCode.Equals("2537"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_CHANNEL_NOT_AVAILABLE.频道不可用（{0}）。", errorCode));
                }
                else if (errorCode.Equals("2538"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_HOST_NOT_AVAILABLE.无法连接消息队列主机（{0}）。", errorCode));
                }
                else if (errorCode.Equals("2539"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_CHANNEL_CONFIG_ERROR.频道配置错误（{0}）。", errorCode));
                }
                else if (errorCode.Equals("2540"))
                {
                    this.WriteInfo(this.GetType(), string.Format("MQRC_UNKNOWN_CHANNEL_NAME.未知频道称（{0}）。", errorCode));
                }
                else
                {
                    if (errorCode.Length == 4)
                    {
                        this.WriteInfo(this.GetType(), string.Format("未知错误消息，错误原因编码：{0}。", errorCode));
                    }
                    else
                    {
                        this.WriteInfo(this.GetType(), string.Format("{0} {1}", businessName, errorCode));
                    }
                }
            }
        }
    }

去掉消息头：

/// <summary>
        /// 去掉消息头
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="name"></param>
        /// <returns></returns>
        public string RemoveMsgHeader(string msg, string name)
        {
            msg = msg.Trim();

            //去掉消息头
            int index = msg.IndexOf("<" + name, StringComparison.Ordinal);
            if (index > 0)
            {
                string temp = msg.Substring(0, index);
                msg = msg.Substring(index, msg.Length - temp.Length);
                msg = msg.Trim();
            }

            return msg;
        }

配置信息：

public class IBMWMQConfig
    {
        /// <summary>
        /// MQ主机地址
        /// </summary>
        private static readonly string CONNECTION_HOST = ConfigHelper.GetValue("IBM_WMQ_CONNECTION_HOST");
        /// <summary>
        /// 通讯端口
        /// </summary>
        private const int CONNECTION_PORT = 4421;
        /// <summary>
        /// CLIENT_ID
        /// </summary>
        private const string CLIENT_ID = "";
        /// <summary>
        /// 通道名称
        /// </summary>
        public const string CHANNEL = "";
        /// <summary>
        /// 队列管理器名称
        /// </summary>
        public const string QUEUE_MGR_NAME = "";
        /// <summary>
        /// 订阅主题持久化标识，{0}标识具体业务
        /// </summary>
        public static readonly string SUBSCRIPTION_TEMPLATE = "JMS:" + QUEUE_MGR_NAME + ":" + CLIENT_ID + "_{0}.REQ:{0}.REQ";
        /// <summary>
        /// 主题名称模板，{0}标识具体业务
        /// </summary>
        public static readonly string TOPIC_TEMPLATE = "{0}.REQ";
        /// <summary>
        /// IBM.WMQ连接字符串
        /// </summary>
        public static readonly string CONNECTION_INFO = string.Format("{0}({1})", CONNECTION_HOST, CONNECTION_PORT);
        
    }

调用：

IBMWMQHelper helper = new IBMWMQHelper(new CustomIBMWMQMsgHandler());
helper.SubTopic1(IBMWMQConfig.BUSINESS_NAME_ZAPZ10);