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Preventing two instances of the same application workbench [message #445429]

Tue, 28 February 2006 20:25

Eclipse User

Hi All,

Does anyone know how to prevent the user from starting up two instances of the same RCP application? I.e., when the user double-clicks the app's .exe, is there a way to check if an instance already exists? And if so, prevent a second instance from starting?

Thanks.

Re: Preventing two instances of the same application workbench [message #445466 is a reply to message #445429]

Wed, 01 March 2006 05:02

Eclipse User

I have done it before (but not in eclipse).
 
 When your application starts check for
a file called .lock, if i exists then terminate, if it does not exist create
it.
 
 In the stop method of the application
delete the file.
 
 The problem with this is if the pc is
turned off then the delete never happens and so the app will never start
again.
 
 To get round this I had a background
task ( i did it every 30 seconds) run periodically and update the time
stamp on the file. Then update the startup code to check if the file exists
and also to make sure it is recent, if it is an old lock file then cary
on and start up.
 
 So if you get a catastrophic failure
at least the app will start again 30 seconds later, you can even advise
the user of this when terminating because you found the .lock file.

Re: Preventing two instances of the same application workbench [message #447692 is a reply to message #445466]

Wed, 12 April 2006 17:10

Eclipse User

Thanks. This might be a suitable solution.

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