Project design-Use of command mode

First look at the figure

 

The above design uses the command mode to create tasks, which can be decoupled. After decoupling, tasks can be easily added, and management tasks (such as canceling tasks) follow the principle of opening and closing.
The task object is the parent class of the command, and its logintask and other sub-classes are specific command tasks. The caller taskinvoker is the waiter and the website is the executor. That is, the task caller uses the task to execute some tasks on the website, such as publishing information

 

I think I must have understood something wrong. I hope I can make a strong decision. If there are any details, I can also point out