Question

我正在尝试创建一个Session实现。为了完成它，我需要创建会话超时。为此，我决定使用在x秒后执行的Timer。但是，如果在该计时器到期之前收到请求，则应重新安排该请求。

所以，我有一个计时器：

using System.Threading.Timer;

public class SessionManager {
    private int timeToLive; //Initialized in the constructor.
    private ConcurrentDictionary<Guid, Session> sessions; //Populated in establishSession. Removed in abandonSession.

    public Session establishSession(...)
    {
        Session session = ...; //I have a session object here. It's been added to the dictionary.

        TimerCallback tcb = abandonSession;
        Timer sessionTimer = new Timer(tcb, null, timeToLive, Timeout.Infinite);
    }

    public void abandonSession(Object stateInfo)
    {
        //I need to cancel the session here, which means I need to retrieve the Session, but how?
    }

    public void refreshSession(Session session)
    {
        //A request has come in; I have the session object, now I need to reschedule its timer. How can I get reference to the timer? How can I reschedule it?
    }
}

我需要帮助：

我可以让sessionTimer成为Session对象的成员。那会让我访问refreshSession()中的Timer对象但是我不知道如何“重新安排”它。
我仍然不知道如何获得对它的引用 Session回调中的abandonSession()。有没有办法在Session？

stateInfo

我原以为我可以在SessionManager对象上存储对Session的引用，并在Session对象的abandonSession()对象上使用回调引用方法。这看起来很草率。你觉得怎么样？

如果需要更多信息，请告诉我。

Answer 1

使用 Change method 设置新的调用延迟：

sessionTimer.Change(timeToLive, timeToLive)

至于在回调方法中获取值，当前作为 null 传递的第二个参数是您的回调对象...您的Timer回调方法强制签名为object并且您可以将该对象强制转换为传入类型以使用它。

var myState = new Something();
var sessionTimer = new Timer(tcb, myState, timeToLive, Timeout.Infinite);

...

public void abandonSession(Object stateInfo)
{
    var myState = (Something)stateInfo;
    //I need to cancel the session here, which means I need to retrieve the Session, but how?
}

如何重新安排C＃System.Threading.Timer？

1 个答案: