需要一个定时器在特定时间和每 5 分钟触发一次直到作业完成 [英] Need A Timer To Fire At Specific Time And Every 5 Minutes Until Job Complete
问题描述
我需要帮助为我的应用程序设置特定类型的计时器.我的场景是这样的:
I need help setting up a specific type of timer for my application. My scenario is this:
我想在一天中的特定时间(比如凌晨 4:00)运行计时器.然后,该计时器执行许多不同的事件,每个事件都会触发并从数据库中获取数据并对其进行处理(使用后台工作程序).所有不同的事件需要不同的时间来完成(可能是 30 秒,可能是 5 分钟).我想每 5 分钟连续输入一次计时器事件,然后检查所有事件是否已完成.如果是这样,请停止计时器并在第二天早上 4:00 重新启动它,依此类推.
I want to run a timer at a specific time of day (say 4:00AM). That timer then executes a number of different events that each go off and grab data from a database and process it (using background workers). All the different events take different times to finish (could be 30 seconds, could be 5 minutes). I want to continuously enter the timer event every 5 minutes thereafter checking if all events have finished. If so, stop the timer and restart it again at 4:00AM the next morning and so on.
所以这个过程看起来像这样:
So the process would look like this:
04:00AM - 启动计时器并启动后台工作人员
04:05AM - 再次检查进程是否已完成(如果是,停止计时器)
04:10AM - 再次检查以查看进程是否已完成(如果是,停止计时器)
等等……
04:00AM - Start Timer and initiate background workers
04:05AM - Check again to see if processes have completed (if so, stop timer)
04:10AM - Check again to see if processes have completed (if so, stop timer)
And so on....
我已经有了处理我的数据库信息的后台工作代码.所以我只需要帮助设置计时器.
I already have my background worker code that processes my database information. So I just need help setting up the timer.
到目前为止,我的 Tick
事件中有以下内容:
So far I have the following in my Tick
event:
Private Sub tmr_Maintenance_Tick(sender As Object, e As EventArgs) Handles tmr_Maintenance.Tick
Dim CurrentTime As Date
Dim CurrHour As Integer
CurrentTime = DateTime.Now
CurrHour = CurrentTime.Hour
'Automatic Sales Import
With My.Settings
If CurrHour = 4 Then
If Not .Maintenance_Ran Then
CreateLog("Maintenance Started")
If Not .Yesterdays_Sales_Imported Then
CreateLog("Importing Yesterday's Sales From Portal")
If Not YesterdaysSales_Worker.IsBusy Then YesterdaysSales_Worker.RunWorkerAsync()
End If
If Not .WTD_Sales_Imported Then
CreateLog("Importing Week To Date Sales From Portal")
If Not WeekToDateSales_Worker.IsBusy Then WeekToDateSales_Worker.RunWorkerAsync()
End If
If Not .LW_Sales_Imported Then
CreateLog("Importing Last Week Sales From Portal")
If Not LastWeekSales_Worker.IsBusy Then LastWeekSales_Worker.RunWorkerAsync()
End If
If .Yesterdays_Sales_Imported = True And .WTD_Sales_Imported = True And .LW_Sales_Imported = True Then
.Maintenance_Ran = True
End If
End If
Else
.Maintenance_Ran = False
End If
End With
My.Settings.Save()
End Sub
感谢任何帮助.
推荐答案
这里有一个基本的框架,你可以从:
Here's a basic framework you can start from:
Public Class Form1
Private Enum MaintenanceState
WaitingToStart
Started
End Enum
Private Target As DateTime
Private state As MaintenanceState = MaintenanceState.WaitingToStart
Private MaintenanceTime As New TimeSpan(4, 0, 0) ' 4:00 am
Private WaitingInterval As New TimeSpan(0, 5, 0) ' Five minutes
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Target = GetNextMaintenanceTarget(MaintenanceTime)
tmr_Maintenance.Interval = 1000
tmr_Maintenance.Start()
End Sub
Private Sub tmr_Maintenance_Tick(sender As Object, e As EventArgs) Handles tmr_Maintenance.Tick
' optionally display time remaining until next target
Dim ts As TimeSpan = Target.Subtract(DateTime.Now)
Label1.Text = ts.ToString("hh\:mm\:ss")
' see if we've hit the target
If DateTime.Now >= Target Then
tmr_Maintenance.Stop()
Select Case state
Case MaintenanceState.WaitingToStart
' ... start all the jobs ...
state = MaintenanceState.Started
Target = DateTime.Now.Add(WaitingInterval)
Case MaintenanceState.Started
' ... check to see if the jobs are all done ...
If Not AllJobsCompleted Then
Target = DateTime.Now.Add(WaitingInterval)
Else
state = MaintenanceState.WaitingToStart
Target = GetNextMaintenanceTarget(MaintenanceTime)
End If
End Select
tmr_Maintenance.Start()
End If
End Sub
Private Function GetNextMaintenanceTarget(ByVal time As TimeSpan) As DateTime
Dim dt As DateTime = DateTime.Today.Add(time)
If DateTime.Now > dt Then
dt = dt.AddDays(1) ' already past target time for today, next start is tomorrow
End If
Return dt
End Function
End Class
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