Policy Mode + Singleton mode + simple Factory mode: Push service

First, the function:

Implement get data-based on user subscription checklist push here: QQ, Email, App, plugin, etc.

　　　　　　Users can select multiple push modes.

Second, the realization

1. Push mode-enumeration (bitwise operation):

[Flags]      Public enum Pushtype    {        0,        2    }

2. Policy mode: Abstract push strategy

 Public Interface Ipush    {        bool Push (object  data);    }

3, QQ push send +email push

QQ Push: Singleton mode-Create a static QQ push service, thread safety.

  Public classQq:ipush {QQ () {}Private StaticQQ _instance =NewQQ ();  Public StaticQQ getinstance () {return_instance; }         Public BOOLPush (Objectdata) {Console.WriteLine ("QQ Push Service open, is pushing ..."); Console.WriteLine ("QQ push success."); return true; }    }

Email push:

 Public class Email:ipush    {        publicbool Push (object  data)        {            Console.WriteLine ("  mail push service on, pushing ... " );            Console.WriteLine (" Mail push succeeded. " );             return true ;        }    }

4, simple Factory mode to create a specific service type

public static class Pushservicefactory    {public        static Ipush creat (Pushtype type)        {            Ipush pushservice = null;            Switch (type)            {case                PushType.QQ:pushService = QQ. GetInstance (); break;                Case PushType.Email:pushService = new Email (); break;            }            return pushservice;        }    }

5. Theme: Push service

Get a subscription checklist, process data, push.

Of course, the push is based on the user's checked push mode (list<pushtype> types) to traverse the push.

 Public classPushprovider { Public ObjectGetusersubscribeddata (stringuserid) {Console.WriteLine ("get a subscription checklist"); return New Object(); }         Public ObjectHandledata (list<Object>data) {Console.WriteLine ("working with Data"); return New Object(); }             Public voidExcutepush (ObjectData, list<pushtype>types) {Console.WriteLine ("Push Data"); foreach(Pushtype typeinchtypes) {Ipush Pushservice=pushservicefactory.creat (type);            Pushservice.push (data); }        }    }

6. Call

 classProgram {Static voidMain (string[] args) {            //user Tick Subscription methodList<pushstategy.pushtype> pushtypes =NewList<pushstategy.pushtype>() {PushStategy.PushType.Email}; //assumption: The data that the system needs to pushlist<Object> resourcedata =Newlist<Object>(); Pushprovider Service=NewPushprovider (); //Get user list            ObjectUsersubscriptdata= service. Getusersubscribeddata ("Getdatafromuserid"); //filter out user data based on system data            Objectresult =service.            Handledata (Resourcedata); //push filtered data to usersservice.            Excutepush (result, pushtypes);        Console.readkey (); }    }

7. Conclusion

Through the singleton mode, we re-recognize the static, the instance and the multithreading, and comb the memory allocation by multithreading. The next chapter summarizes.

Policy Mode + Singleton mode + simple Factory mode: Push service