Primitive user-mode construction--an asynchronous Web request instance implemented by interlocking constructs interlocked

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Net.Http;5 usingSystem.Text;6 usingSystem.Threading;7 usingSystem.Threading.Tasks;8 9 namespaceTestTen { One     enumCoordinationstatus A     { - Alldone, - Cancel, the Timeout -     } -     classAsynccoordinator -     { +         Private intstatusreported =0; -         Private intOp_count =1; +  A         PrivateAction<coordinationstatus>callback; at         Privatetimer timer; -  -          Public voidAbouttobegin (intnum =1) -         { -Interlocked.add (refop_count, num); -         } in  -          Public voidjusttoend () to         { +             if(Interlocked.decrement (refOp_count) = =0) -             { the Reportstatus (coordinationstatus.alldone); *             } $         }Panax Notoginseng  -          Public voidAllbegun (Action<coordinationstatus> callback,intTimeout =timeout.infinite) the         { +              This. Callback =callback; A             if(Timeout! =timeout.infinite) the             { +Timer =NewTimer (Expired,NULL, timeout, timeout.infinite); -             } $ justtoend (); $         } -  -         Private voidExpired (Objectobj) the         { - Reportstatus (coordinationstatus.cancel);Wuyi         } the          Public voidCancel () -         { Wu Reportstatus (coordinationstatus.cancel); -         } About         Private voidreportstatus (coordinationstatus status) $         { -             if(Interlocked.exchange (refStatusreported,1) ==0) -             { - callback (status); A             } +         } the  -  $  the     } the  the     classmultiwebrequests the     { -         PrivateAsynccoordinator coordinator =Newasynccoordinator (); in  the         Privatedictionary<string,Object> Servers =Newdictionary<string,Object>(){ the{"http://www.baidu.com",NULL}, About{"http://www.sina.com",NULL}, the{"http://www.qq.com",NULL}, the         }; the  +          Publicmultiwebrequests () -         { the Bayi             varHTTP =NewHttpClient (); the             foreach(varUrlinchservers. Keys) the             { -                 //a request was sent -Coordinator. Abouttobegin (1); thehttp. Getbytearrayasync (URL). ContinueWith (Task =getresult (URL, Task)); the             } the             //all requests are sent . the coordinator. Allbegun (Alldone, timeout.infinite); -         } the  the         Private voidGetResult (stringServer, task<byte[]>Task) the         {94             ObjectRes; the             if(Task. Exception! =NULL) the             { theres =task. exception.innerexceptions;98             } About             Else -             {101res =task. Result.length;102             }103Servers[server] =Res;104             //a request was completed the coordinator. Justtoend ();106         }107 108          Public voidCancel ()109         { the coordinator. Cancel ();111         } the 113         Private voidalldone (coordinationstatus status) the         { the             Switch(status) the             {117                  CaseCoordinationstatus.alldone:118Console.WriteLine ("alldone:");119  -                     foreach(varIteminchservers)121                     {122 Console.Write (item. Key);123                         Objectval =item. Value;124                         if(Val isException) the                         {126Console.WriteLine ("Exception: {0}", Val. GetType (). Name);127                         } -                         Else129                         { theConsole.WriteLine ("returned {0:n0} bytes", Val);131                         } the                     }133                      Break;134                  CaseCoordinationstatus.cancel:135                      Break;136                  Casecoordinationstatus.timeout:137                      Break;138                 default:139                      Break; $             }141         }142     }143}

Primitive user-mode construction--an asynchronous Web request instance implemented by interlocking constructs interlocked