C # Object Lock

Now there is a scenario where the server sends a task to 10 clients, and after all the clients have finished executing, the entire task is executed.

After each client executes, a completed message is sent over HTTP to the server, and the server sends an email notification to the user.

When 10 clients send a complete request at the same time, the client list results from the server query from the database are not completed and may send 1~10 messages.

The workaround is to add an object lock to the task ID.

//result Query lock dictionary, lock according to ID, when all the devices are completed, this lock object can be discarded        Private Staticdictionary<Long,Object> task_res_lockers =Newdictionary<Long,Object>();  Public ObjectGetlocker (LongtaskId) {            if(!task_res_lockers. ContainsKey (taskId)) {Task_res_lockers[taskid]=NewObject (); }            returnTask_res_lockers[taskid]; }         Public voidRemovelock (LongtaskId) {            if(task_res_lockers. ContainsKey (taskId)) {task_res_lockers.            Remove (TASKID); }        }

When the client returns execution results

Lock (Agentresultdao.getlocker (taskId)) {     //  Process Task completion logic      //  when the task is completed  Agentresultdao.removelock (taskId) Release object reference

The lock keyword is actually a syntax sugar for the Monitor class

BOOL false ; Try {    ref  acquiredlock);     // Code that accesses resources is protected by the lock. }finally{    if  (acquiredlock)    {        Monitor.Exit ( lockobject);}    }

C # Object Lock