[英]Create observable and consume only between events
想象一下以下場景:
我有這個事件:
在AfterLogin之后,我根據可用的新/其他對象有其他事件。
當用戶進行登錄時,我需要創建一個新訂閱並訂閱或處理它(使用其他事件)。
當用戶進行注銷時,我需要處理這些訂閱並再次等待AfterLogin
它非常類似於: 在具有Rx的值之間
最大的不同之處在於,“工廠”需要創建訂閱並稍后進行處理,我無法在開始時聽取消息來源。
我怎么處理這個?
由於您沒有提供任何代碼,並且規范有點模糊,因此很難給出特定的代碼示例,因此這有點雜亂無章。
但也許它會提供一些靈感或指導您更具體的問題。 發布您嘗試的一些內容總是有幫助的!
該代碼為您提供了一個非終止的流,它包含所有會話中登錄用戶生成的所有事件。
public class LoggedInActivity
{
[Test]
public void TestLoggingIn()
{
var sessionManager = new SessionManager();
var afterLogIn = Observable.FromEventPattern<SessionEventArgs>(
h => sessionManager.AfterLogin += h,
h => sessionManager.AfterLogin -= h)
.Select(x => x.EventArgs.UserId);
var beforeLogOff = Observable.FromEventPattern<SessionEventArgs>(
h => sessionManager.BeforeLogoff += h,
h => sessionManager.BeforeLogoff -= h)
.Select(x => x.EventArgs.UserId);
var loggedIn = afterLogIn.GroupByUntil(
userId => userId,
login => beforeLogOff.Where(y => y == login.Key));
Func<IGroupedObservable<int, int>, IObservable<string>> whileLoggedIn = login =>
Observable.Using(
() => sessionManager.AddSession(new Session(login.Key)),
session => Observable.FromEventPattern(
h => session.SomeEvent += h,
h => session.SomeEvent -= h)
.Select(x => "User " + login.Key + " had SomeEvent!")
.TakeUntil(login.LastAsync()));
// Single non-terminating stream that captures
// all events occuring during any login
var loggedInEvents = loggedIn.SelectMany(whileLoggedIn);
loggedInEvents.Subscribe(Console.WriteLine);
sessionManager.Login(1);
sessionManager.Sessions[1].RaiseSomeEvent();
sessionManager.Login(2);
sessionManager.Sessions[1].RaiseSomeEvent();
sessionManager.Sessions[2].RaiseSomeEvent();
sessionManager.Logoff(2);
sessionManager.Logoff(1);
}
}
public class SessionManager
{
public event EventHandler<SessionEventArgs> AfterLogin;
public event EventHandler<SessionEventArgs> BeforeLogoff;
private readonly Dictionary<int, Session> _sessions = new Dictionary<int, Session>();
public Dictionary<int, Session> Sessions { get { return _sessions; } }
public void Login(int userId)
{
var temp = AfterLogin;
if (temp != null)
{
AfterLogin(this, new SessionEventArgs(userId));
}
}
public Session AddSession(Session session)
{
_sessions.Add(session.UserId, session);
return session;
}
public void Logoff(int userId)
{
var temp = BeforeLogoff;
if (temp != null)
{
BeforeLogoff(this, new SessionEventArgs(userId));
}
Sessions.Remove(userId);
}
}
public class Session : IDisposable
{
private readonly int _userId;
public int UserId { get { return _userId; } }
public Session(int userId)
{
_userId = userId;
Console.WriteLine("User " + _userId + " logged in.");
}
public event EventHandler SomeEvent;
public void RaiseSomeEvent()
{
var temp = SomeEvent;
if (temp != null)
{
SomeEvent(this, EventArgs.Empty);
}
}
public void Dispose()
{
Console.WriteLine("User " + _userId + " logged out.");
}
}
public class SessionEventArgs : EventArgs
{
private readonly int _userId;
public SessionEventArgs(int userId)
{
_userId = userId;
}
public int UserId { get { return _userId; } }
}
會話實例及其事件的可觀察流在登錄時創建,並在注銷時處理。
運行測試的輸出是:
User 1 logged in.
User 1 had SomeEvent!
User 2 logged in.
User 1 had SomeEvent!
User 2 had SomeEvent!
User 2 logged out.
User 1 logged out.
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