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ASP Windows Service or Console based applicationHi all,
I am confused as to what kind of application to develop. I have to create an application thats like a "Engine" which continously monitors a DB or whatever. It has to work even if the user logoff as this engine feeds some other application. I tried creating a Windows service that runs continously but the status shows "Starting" and i cant "Stop" or "Pause" and was suggested by one BravesCharm that "Status does not change as the service never notifies the SCM that everything started OK" which makes sense. Is there a way for windows service to start some other application? is yes then how can i stop it from this windows service? Please do give me suggestions on how to achieve this. Thanks, Stephen build a windows service application to monitor the process - these are
called watch dog applications. You don't need to programmatically build a stop or pause routine into the application because that type of functionality is typically handled by the windows control manager. A console based application is less reliable because it isnt automatically started when windows restarts -- Show quoteRegards, Alvin Bruney [MVP ASP.NET] [Shameless Author plug] The Microsoft Office Web Components Black Book with .NET Now Available @ www.lulu.com/owc Forth-coming VSTO.NET - Wrox/Wiley 2006 ------------------------------------------------------- "Stephen" <stephen***@hotmail.com> wrote in message news:ecATjVmAGHA.3804@TK2MSFTNGP14.phx.gbl... > Hi all, > I am confused as to what kind of application to develop. I have to create an > application thats like a "Engine" which continously monitors a DB or > whatever. It has to work even if the user logoff as this engine feeds some > other application. > I tried creating a Windows service that runs continously but the status > shows "Starting" and i cant "Stop" or "Pause" and was suggested by one > BravesCharm that "Status does not change as the service never notifies the > SCM that everything started OK" which makes sense. > Is there a way for windows service to start some other application? is yes > then how can i stop it from this windows service? > > Please do give me suggestions on how to achieve this. > > Thanks, > Stephen > > Thanks Alvin,
Question: How do I stop or Pause the service? as the SCM status is always "Starting" and "Stop" and "Pause" is never enabled. Here's and eg of what I have experimented with: 1. Created a Windows Service and have used "OnStart" and "OnStop" 2. OnStart (Just for kicks) insert records into a testDB until conditions match 3. OnStop delete all records from testDB. Problem: OnStart starts the service and contiunues forever... the condition does not set itself to "Started", so the only way I can stop is to kill the process Any suggestions, Thanks again, Stephen Show quote "Alvin Bruney - ASP.NET MVP" <www.lulu.com/owc> wrote in message news:On6Q2xmAGHA.1028@TK2MSFTNGP11.phx.gbl... > build a windows service application to monitor the process - these are > called watch dog applications. You don't need to programmatically build a > stop or pause routine into the application because that type of > functionality is typically handled by the windows control manager. > > A console based application is less reliable because it isnt automatically > started when windows restarts > > -- > Regards, > Alvin Bruney [MVP ASP.NET] > > [Shameless Author plug] > The Microsoft Office Web Components Black Book with .NET > Now Available @ www.lulu.com/owc > Forth-coming VSTO.NET - Wrox/Wiley 2006 > ------------------------------------------------------- > > > > "Stephen" <stephen***@hotmail.com> wrote in message > news:ecATjVmAGHA.3804@TK2MSFTNGP14.phx.gbl... > > Hi all, > > I am confused as to what kind of application to develop. I have to create > an > > application thats like a "Engine" which continously monitors a DB or > > whatever. It has to work even if the user logoff as this engine feeds some > > other application. > > I tried creating a Windows service that runs continously but the status > > shows "Starting" and i cant "Stop" or "Pause" and was suggested by one > > BravesCharm that "Status does not change as the service never notifies the > > SCM that everything started OK" which makes sense. > > Is there a way for windows service to start some other application? is yes > > then how can i stop it from this windows service? > > > > Please do give me suggestions on how to achieve this. > > > > Thanks, > > Stephen > > > > > > The problem is that you do something in OnStart() of the Windows service and
the something keppes going on until some conditions matched. So, until the conditions matched, the windows service will never be fully started (i,e. not able to provide service). According to your previous post, I think you are using Windows Service in a wrong way. If you want a windows service do something, you do it AFTER the service is started. In OnStart() you do initializing (i.e, prepare the Windows service for the job you want it to do). For example, it the Win Service is used for access data in database, you do not put the main data access process in OnStart(), but you can write some code in OnStart() to get database access settings, such as read ConnectionString from config. file or from registry. Of cource, the logic in OnStart() can be more complecated than that. Then, you must handle all possible exceptions in order for the service can be started, and you also have to have a way to deal situation like, if particaular initialization in OnStart() fails and the service started anyway, what is the impact on the job you want the service to do... The other thing you need to remember is, Wndows Service itself does nothing. It provides a hosting environment for certain objects to run inside it. Most ..NET books use FileWatcher as the object hosted by a Windows Service. Typically, you can host a Remoting object in Windows Service to do what you want (accessing database...). Show quote "Stephen" <stephen***@hotmail.com> wrote in message news:OAKC6dnAGHA.1288@TK2MSFTNGP09.phx.gbl... > Thanks Alvin, > Question: > How do I stop or Pause the service? as the SCM status is always "Starting" > and "Stop" and "Pause" is never enabled. > > Here's and eg of what I have experimented with: > 1. Created a Windows Service and have used "OnStart" and "OnStop" > 2. OnStart (Just for kicks) insert records into a testDB until conditions > match > 3. OnStop delete all records from testDB. > > Problem: > OnStart starts the service and contiunues forever... the condition does > not > set itself to "Started", so the only way I can stop is to kill the process > > Any suggestions, > Thanks again, > Stephen > > "Alvin Bruney - ASP.NET MVP" <www.lulu.com/owc> wrote in message > news:On6Q2xmAGHA.1028@TK2MSFTNGP11.phx.gbl... >> build a windows service application to monitor the process - these are >> called watch dog applications. You don't need to programmatically build a >> stop or pause routine into the application because that type of >> functionality is typically handled by the windows control manager. >> >> A console based application is less reliable because it isnt >> automatically >> started when windows restarts >> >> -- >> Regards, >> Alvin Bruney [MVP ASP.NET] >> >> [Shameless Author plug] >> The Microsoft Office Web Components Black Book with .NET >> Now Available @ www.lulu.com/owc >> Forth-coming VSTO.NET - Wrox/Wiley 2006 >> ------------------------------------------------------- >> >> >> >> "Stephen" <stephen***@hotmail.com> wrote in message >> news:ecATjVmAGHA.3804@TK2MSFTNGP14.phx.gbl... >> > Hi all, >> > I am confused as to what kind of application to develop. I have to > create >> an >> > application thats like a "Engine" which continously monitors a DB or >> > whatever. It has to work even if the user logoff as this engine feeds > some >> > other application. >> > I tried creating a Windows service that runs continously but the status >> > shows "Starting" and i cant "Stop" or "Pause" and was suggested by one >> > BravesCharm that "Status does not change as the service never notifies > the >> > SCM that everything started OK" which makes sense. >> > Is there a way for windows service to start some other application? is > yes >> > then how can i stop it from this windows service? >> > >> > Please do give me suggestions on how to achieve this. >> > >> > Thanks, >> > Stephen >> > >> > >> >> > > Thanks Yuan,
it makes sense. Stephen Show quote "Norman Yuan" <NotR***@NotReal.not> wrote in message news:uGUArU0AGHA.3984@TK2MSFTNGP14.phx.gbl... > The problem is that you do something in OnStart() of the Windows service and > the something keppes going on until some conditions matched. So, until the > conditions matched, the windows service will never be fully started (i,e. > not able to provide service). > > According to your previous post, I think you are using Windows Service in a > wrong way. If you want a windows service do something, you do it AFTER the > service is started. In OnStart() you do initializing (i.e, prepare the > Windows service for the job you want it to do). For example, it the Win > Service is used for access data in database, you do not put the main data > access process in OnStart(), but you can write some code in OnStart() to get > database access settings, such as read ConnectionString from config. file or > from registry. Of cource, the logic in OnStart() can be more complecated > than that. Then, you must handle all possible exceptions in order for the > service can be started, and you also have to have a way to deal situation > like, if particaular initialization in OnStart() fails and the service > started anyway, what is the impact on the job you want the service to do... > > The other thing you need to remember is, Wndows Service itself does nothing. > It provides a hosting environment for certain objects to run inside it. Most > .NET books use FileWatcher as the object hosted by a Windows Service. > Typically, you can host a Remoting object in Windows Service to do what you > want (accessing database...). > > > "Stephen" <stephen***@hotmail.com> wrote in message > news:OAKC6dnAGHA.1288@TK2MSFTNGP09.phx.gbl... > > Thanks Alvin, > > Question: > > How do I stop or Pause the service? as the SCM status is always "Starting" > > and "Stop" and "Pause" is never enabled. > > > > Here's and eg of what I have experimented with: > > 1. Created a Windows Service and have used "OnStart" and "OnStop" > > 2. OnStart (Just for kicks) insert records into a testDB until conditions > > match > > 3. OnStop delete all records from testDB. > > > > Problem: > > OnStart starts the service and contiunues forever... the condition does > > not > > set itself to "Started", so the only way I can stop is to kill the process > > > > Any suggestions, > > Thanks again, > > Stephen > > > > "Alvin Bruney - ASP.NET MVP" <www.lulu.com/owc> wrote in message > > news:On6Q2xmAGHA.1028@TK2MSFTNGP11.phx.gbl... > >> build a windows service application to monitor the process - these are > >> called watch dog applications. You don't need to programmatically build a > >> stop or pause routine into the application because that type of > >> functionality is typically handled by the windows control manager. > >> > >> A console based application is less reliable because it isnt > >> automatically > >> started when windows restarts > >> > >> -- > >> Regards, > >> Alvin Bruney [MVP ASP.NET] > >> > >> [Shameless Author plug] > >> The Microsoft Office Web Components Black Book with .NET > >> Now Available @ www.lulu.com/owc > >> Forth-coming VSTO.NET - Wrox/Wiley 2006 > >> ------------------------------------------------------- > >> > >> > >> > >> "Stephen" <stephen***@hotmail.com> wrote in message > >> news:ecATjVmAGHA.3804@TK2MSFTNGP14.phx.gbl... > >> > Hi all, > >> > I am confused as to what kind of application to develop. I have to > > create > >> an > >> > application thats like a "Engine" which continously monitors a DB or > >> > whatever. It has to work even if the user logoff as this engine feeds > > some > >> > other application. > >> > I tried creating a Windows service that runs continously but the status > >> > shows "Starting" and i cant "Stop" or "Pause" and was suggested by one > >> > BravesCharm that "Status does not change as the service never notifies > > the > >> > SCM that everything started OK" which makes sense. > >> > Is there a way for windows service to start some other application? is > > yes > >> > then how can i stop it from this windows service? > >> > > >> > Please do give me suggestions on how to achieve this. > >> > > >> > Thanks, > >> > Stephen > >> > > >> > > >> > >> > > > > > > I tend to build business classes that can be plugged into any kind of
interface, be it a Console app, Windows Service, or Windows form. You never know when you may need to extend it. And besides, building a simple Windows Form for testing is much easier than debugging a Windows Service. But I do agree with Alvin that ultimately, you should plug it into a Windows Service. -- Show quoteHTH, Kevin Spencer Microsoft MVP ..Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. "Alvin Bruney - ASP.NET MVP" <www.lulu.com/owc> wrote in message news:On6Q2xmAGHA.1028@TK2MSFTNGP11.phx.gbl... > build a windows service application to monitor the process - these are > called watch dog applications. You don't need to programmatically build a > stop or pause routine into the application because that type of > functionality is typically handled by the windows control manager. > > A console based application is less reliable because it isnt automatically > started when windows restarts > > -- > Regards, > Alvin Bruney [MVP ASP.NET] > > [Shameless Author plug] > The Microsoft Office Web Components Black Book with .NET > Now Available @ www.lulu.com/owc > Forth-coming VSTO.NET - Wrox/Wiley 2006 > ------------------------------------------------------- > > > > "Stephen" <stephen***@hotmail.com> wrote in message > news:ecATjVmAGHA.3804@TK2MSFTNGP14.phx.gbl... >> Hi all, >> I am confused as to what kind of application to develop. I have to create > an >> application thats like a "Engine" which continously monitors a DB or >> whatever. It has to work even if the user logoff as this engine feeds >> some >> other application. >> I tried creating a Windows service that runs continously but the status >> shows "Starting" and i cant "Stop" or "Pause" and was suggested by one >> BravesCharm that "Status does not change as the service never notifies >> the >> SCM that everything started OK" which makes sense. >> Is there a way for windows service to start some other application? is >> yes >> then how can i stop it from this windows service? >> >> Please do give me suggestions on how to achieve this. >> >> Thanks, >> Stephen >> >> > >  |
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