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Cancelling a JGit operation [message #1779343]

Fri, 05 January 2018 16:08

Dave Musicant

Messages: 15
Registered: May 2016

Junior Member

Is there a way to kill/cancel a JGit call in progress? Suppose I'm building a GUI with a cancel button, where I want to be able to kill a slow JGit command that is in progress. The call() method itself is blocking. Is there an API for interrupting it?

Thanks for the info.

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Re: Cancelling a JGit operation [message #1779411 is a reply to message #1779343]

Sat, 06 January 2018 18:52

Matthias Sohn

Messages: 1027
Registered: July 2009

Senior Member

You should be able to cancel commands which accept a ProgressMonitor, e.g. CloneCommand.
Find examples in EGit which uses Eclipse's ProgressMonitor which can be used in JGit by wrapping it with an
EclipseGitProgressTransformer. When ProgressMonitor.isCancelled() returns true the command should
be cancelled.

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Re: Cancelling a JGit operation [message #1779500 is a reply to message #1779411]

Mon, 08 January 2018 19:36

Dave Musicant

Messages: 15
Registered: May 2016

Junior Member

Thanks for the response, Matthias. It looks to me like EclipseGitProgressTransformer, wrapped around a ProgressMonitor, can tell me when an operation (such as CloneCommand) has been cancelled. As you say, the isCancelled method will return true when the operation has been cancelled.

So I think I've now got it, based on your answer, but let's see if I've got this right: to cancel a git operation (where doing so is enabled) I should...

1. Create an IProgressMonitor
2. Wrap an EclipseGitProgressTransformer around the IProgressMonitor
3. Pass the EclipseGitProgressTransformer as a parameter to the git command setProgressMonitor method, e.g. CloneCommand.setProgressMonitor before the call
4. When I want to cancel, issue IProgressMonitor.setCanceled(true); the git command (e.g. CloneCommand) will then poll that and cancel accordingly.

Have I got this right?

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