哪种设计模式用于灵活的消息发送？

Question

我需要实现基于角色的消息发送功能。

• 角色A：消息应通过电子邮件和短信发送
• 角色 B：消息应仅通过电子邮件发送
• 角色 C：消息只能通过短信发送
• 角色 D：消息应由 Twitter 发送

我必须适应有关哪些角色可以使用哪些消息发送功能的更改，例如，我需要能够将角色 B 更改为还包括短信。任何角色都可能需要任何消息发送功能。

我考虑过有一个接口 IMessageChannel 和一个方法 SendMessage。然后是实现该接口的三个类，例如电子邮件、短信和 Twitter。我正在考虑使用策略模式和工厂？这样对吗？

我应该考虑什么设计模式来实现这个？

Answer 1

I am thinking of below solution:
Interface IMessageSystem
{
void Send();
}
Public class Email : IMessageSystem
{
   public void Send()
  {
    console.writeline("Message From Email");
  }
}
Public class SMS : IMessageSystem
{
   public void Send()
  {
    console.writeline("Message From SMS");
  }
}
Public class Twitter : IMessageSystem
{
   public void Send()
  {
    console.writeline("Message From Twitter");
  }
}
Interface ISendMessageStrategy
{
  void SendMessages();
}
Public class SendMessageStrategyForRoleA : ISendMessageStrategy
{
   Public void SendMessages()
  {
    Email objemail = new Email();
   objemail.Send();
   SMS objSMS = new SMS();
   objSMS .Send();
   Twitter objtwitter = new Twitter();
   objtwitter.Send();   
  }
}
Public class SendMessageStrategyForRoleB : ISendMessageStrategy
{
   Public void SendMessages()
  {
   SMS objSMS = new SMS();
   objSMS .Send();
  }
}
Public class SendMessageStrategyForRoleC  : ISendMessageStrategy
{
  Public void SendMessages()
  {  
    Twitter objtwitter = new Twitter();
    objtwitter.Send();
  }
}
Public class SendMessageSystem
{    
   public ISendMessageStrategy sendMessageStrategy;
   List<Keyvaluepair<string,ISendMessageStrategy>> lstkeyval = new List<Keyvaluepair<string,ISendMessageStrategy();
   public SendMessageSystem(string role)
   {
       lstkeyval.add(new keyvaluepair<string,ISendMessageStrategy>("A",new SendMessageStrategyForRoleA()));
       lstkeyval.add(new keyvaluepair<string,ISendMessageStrategy>("B",new SendMessageStrategyForRoleB()));
       lstkeyval.add(new keyvaluepair<string,ISendMessageStrategy>("C",new SendMessageStrategyForRoleC()));
       sendMessageStrategy = lstkeyval.where(x=>x.Key == role).Value;
   }
   public void SendMessage ()
   {
       sendMessageStrategy.SendMessages();
   }
}
public class programme
{
   static void main (string[] args)
   {
     SendMessageSystem objMessage = new SendMessageSystem("A");
     objMessage.SendMessage();
   }
}