Lind.DDD.Messaging框架通讯组件介绍

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大 家好，今天有时间来介绍一下Lind.DDD框架里的消息机制，消息发送这块一般的实现方法是将Email,SMS等集成到一个公用类库里，而本身 Email和SMS没什么关系，它们也不会有什么接口约定，即你想实现某种消息的多态发送，不需要程序代码，基本不可能实现，而在Lind.DDD里面， 大叔将它进行了抽象，消息有自己的统一接口，而对于email和sms只是一种实现而以，这样，就可以发挥面向对象的特性，在sms,email甚至是 rtx上进行消息的灵活切换了，说到这样，您心动了吧！

Lind.DDD.Messaging框架图

接口规范

    /// <summary>
    /// Message Interface
    /// Author:Garrett
    /// </summary>
    public interface IMessageManager
    {
        /// <summary>
        /// Sends a message to a channel using a content item as the recipient
        /// </summary>
        /// <param name="recipient">接收者</param>
        /// <param name="subject">主题</param>
        /// <param name="body">消息主体</param>
        /// <param name="serverVirtualPath">本参数可以没有，服务端模块级路径，只在xmpp中有意义</param>
        void Send(string recipient, string subject, string body, string serverVirtualPath = null);

        /// <summary>
        /// Sends a message to a channel using a set of content items as the recipients
        /// </summary>
        /// <param name="recipients">A set of content items to send the message to. Only one message may be sent if the channel manages it.</param>
        /// <param name="type">A custom string specifying what type of message is sent. Used in even handlers to define the message.</param>
        /// <param name="service">The name of the channel to use, e.g. "email"</param>
        /// <param name="properties">A set of specific properties for the channel.</param>
        void Send(IEnumerable<string> recipients, string subject, string body, string serverVirtualPath = null);

        /// <summary>
        /// Async Sends a message to a channel using a set of content items as the recipients
        /// </summary>
        /// <param name="recipients">A set of content items to send the message to. Only one message may be sent if the channel manages it.</param>
        /// <param name="type">A custom string specifying what type of message is sent. Used in even handlers to define the message.</param>
        /// <param name="service">The name of the channel to use, e.g. "email"</param>
        /// <param name="properties">A set of specific properties for the channel.</param>
        /// <param name="isAsync">is Async</param>
        void Send(IEnumerable<string> recipients, string subject, string body, bool isAsync, string serverVirtualPath = null);
    }

从接口定义上，我们看到了异步的影子，大叔把异步这块写在了参数上，当然，一般情况来说，消息应该都是异步的。

消息上下文

 /// <summary>
    /// 消息实体
    /// </summary>
    public class MessageContext
    {
        /// <summary>
        /// 消息类型
        /// </summary>
        public MessageType Type { get; set; }
        /// <summary>
        /// 消息头
        /// </summary>
        public string Subject { get; set; }
        /// <summary>
        /// 消息正文
        /// </summary>
        public string Body { get; set; }
        /// <summary>
        /// 接受方地址列表
        /// </summary>
        public IEnumerable<string> Addresses { get; set; }
        /// <summary>
        /// 是否处于准备发送状态
        /// </summary>
        public bool MessagePrepared { get; set; }

        public MessageContext()
        {
            Addresses = Enumerable.Empty<string>();//这时Addresses!=null,使用Addresses.ToList().ForEach(i => Console.WriteLine(i));不会引发异常
        }
    }

消息上下文就是消息的对象，类型于EF里的DataContext数据上下文或者HttpContext上下文，都是指实现某些功能的数据对象

消息生产者

/// <summary>
    /// 消息生产者
    /// 具体消息生产者是单例，如Email,SMS,Rtx等
    /// </summary>
    public sealed class MessageFactory
    {
        /// <summary>
        /// 消息工厂
        /// </summary>
        public static IMessageManager GetService(MessageType messageType)
        {
            switch (messageType)
            {
                case MessageType.Email:
                    return EmailMessageManager.Instance;
                case MessageType.SMS:
                    return SMSMessageManager.Instance;
                case MessageType.RTX:
                    return RTXMessageManager.Instance;
                case MessageType.XMPP:
                    return XMPPMessageManager.Instance;
                default:
                    throw new NotImplementedException("消息生产者未被识别...");
            }
        }

    }

从生产者代码上可以看出，在一个领域项目里，你可以通过GetService来使用不同的消息，这是对象的，这前大叔的设计存在一些局限性，一个项目只能用一种消息机制，这对于项目来说，是不能满足了，所以，大叔在Lind.DDD框架里对它进行了改善！

Email实现者

    /// <summary>
    ///Email消息服务
    /// </summary>
    internal class EmailMessageManager : IMessageManager
    {
        #region Singleton
        private static object lockObj = new object();
        public static EmailMessageManager Instance;

        static string email_Address = ConfigurationManager.AppSettings["Email_Address"];
        static string email_DisplayName = ConfigurationManager.AppSettings["Email_DisplayName"];
        static string email_Host = ConfigurationManager.AppSettings["Email_Host"];
        static string email_Password = ConfigurationManager.AppSettings["Email_Password"];
        static int email_Port = Convert.ToInt32(ConfigurationManager.AppSettings["Email_Port"] ?? "21");
        static string email_UserName = ConfigurationManager.AppSettings["Email_UserName"];

        static EmailMessageManager()
        {
            lock (lockObj)
            {
                if (Instance == null)
                    Instance = new EmailMessageManager();
            }
        }
        private EmailMessageManager()
        { }
        #endregion

        #region IMessageManager 成员

        public void Send(string recipient, string subject, string body, string serverVirtualPath = null)
        {
            Send(new List<string> { recipient }, subject, body);
        }

        public void Send(IEnumerable<string> recipients, string subject, string body, string serverVirtualPath = null)
        {
            Send(recipients, subject, body, false);
        }

        public void Send(IEnumerable<string> recipients, string subject, string body, bool isAsync, string serverVirtualPath = null)
        {
            try
            {
                if (recipients != null && recipients.Any())
                {
                    using (SmtpClient client = new SmtpClient()
                    {
                        Host = email_Host,
                        Port = email_Port,
                        Credentials = new NetworkCredential(email_UserName, email_Password),
                        EnableSsl = false,//设置为true会出现"服务器不支持安全连接的错误"
                        DeliveryMethod = SmtpDeliveryMethod.Network,
                    })
                    {

                        #region Send Message
                        var mail = new MailMessage
                        {
                            From = new MailAddress(email_Address, email_DisplayName),
                            Subject = subject,
                            Body = body,
                            IsBodyHtml = true,
                        };
                        MailAddressCollection mailAddressCollection = new MailAddressCollection();
                        recipients.ToList().ForEach(i =>
                        {
                            //email有效性验证
                            if (new Regex(@"^([w-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([w-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$").IsMatch(i))
                                mail.To.Add(i);
                        });
                        if (isAsync)
                        {
                            client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);
                            client.SendAsync(mail, recipients);
                        }
                        else
                        {
                            client.Send(mail);
                        }
                        #endregion
                    }
                }
            }
            catch (Exception ex)
            {
                LoggerFactory.Instance.Logger_Info(ex.Message);
            }

        }

        void client_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
        {
            string arr = null;
            (e.UserState as List<string>).ToList().ForEach(i => { arr += i; });
            //发送完成后要做的事件，可能是写日志
        }

        #endregion
    }

通过代码可以看它自已是个internal的，即对外不公开，对外只能通过消息生成者进行访问，它与SMS，RTX形成了一种策略模式的概念。

SMS实现者，请看Lind.DDD源码

RTX实现者，请看Lind.DDD源码

XMPP实现者，请看Lind.DDD源码

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