状态机问题

发布于 2024-09-28 14:04:18 字数 732 浏览 5 评论 0原文

在同一函数中有一个具有两个转换的状态机。

static readonly object _object = new object();

lock (_object)
{
    // I want Host received the event of SMTrans01 first .
    Obj.StateMachine.Send((int)MyStateMachine.EventType.SMTrans01, new object[2] { Obj, MyStateMachine.EventType.SMTrans01 });
}

lock (_object)
{
    // And then I want Host received the event of SMTrans02.
    Obj.StateMachine.Send((int)MyStateMachine.EventType.SMTrans02, new object[2] { Obj, MyStateMachine.EventType.SMTrans02 });
}

我按照上面的方式实现了我的状态机代码。我不确定我是否正确理解 Lock 语句？

我需要事件遵循正确的顺序（主机首先收到 SMTrans01，然后主机收到 SMTrans02 事件）。

经过测试，我发现有时主机会先收到 SMTrans02 事件。看起来 Lock 语句不起作用。我不知道为什么。

有什么好的方法来应对吗？

原文

There is a State Machine with two Transitions in the same function.

static readonly object _object = new object();

lock (_object)
{
    // I want Host received the event of SMTrans01 first .
    Obj.StateMachine.Send((int)MyStateMachine.EventType.SMTrans01, new object[2] { Obj, MyStateMachine.EventType.SMTrans01 });
}

lock (_object)
{
    // And then I want Host received the event of SMTrans02.
    Obj.StateMachine.Send((int)MyStateMachine.EventType.SMTrans02, new object[2] { Obj, MyStateMachine.EventType.SMTrans02 });
}

I implemented my state machine code as above. I am not sure I understand Lock statement correctly or not?

I need the events followed the the right order (Host received SMTrans01 first, and then host received SMTrans02 event).

After testing I found sometime host will receive the SMTrans02 event first. Looks like Lock statement not work. I don't know why.

Are there any good methods to approach it?

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北斗星光 2024-10-05 14:04:18

看来您的问题与线程和锁定无关。

我怀疑您的 Send 方法是异步的。解决方案是改用同步方法。在收到第一个事件已处理的确认之前，不要发送第二个事件。

或者，重写您的接收代码，以便它可以处理不按顺序出现的事件。

如果您提供 Send 的代码并详细描述如何调用您的方法，这将有助于调试问题。

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橙味迷妹 2024-10-05 14:04:18

如果顺序

EventType _state = EventType.SMTrans02;
if(_state == EventType.SMTrans02 )
{
 _state =EventType.SMTrans01;
  Obj.StateMachine.Send((int)_state, new object[2] { Obj, _state });

}
else
{
_state = EventType.SMTrans02;
Obj.StateMachine.Send((int)_state, new object[2] { Obj, _state });
}

对更复杂的情况很重要，您可以使用 switch 块，甚至使用

您需要 Lock 的状态模式仅同步可能调用这些事件的线程。

if the order matters

EventType _state = EventType.SMTrans02;
if(_state == EventType.SMTrans02 )
{
 _state =EventType.SMTrans01;
  Obj.StateMachine.Send((int)_state, new object[2] { Obj, _state });

}
else
{
_state = EventType.SMTrans02;
Obj.StateMachine.Send((int)_state, new object[2] { Obj, _state });
}

for more complex situation you may use switch block or even use State Pattern

you need Lock only to sync the threads which may call those events.

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