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When the IDE is shutting down (notified by the ModuleInstall.<something>) everyone should stop firing new events.
I've already added code that stops RepositoryUpdater from accepting new tasks after the IDE shutdown is initiated. I'll add some tests to verify that this actually works. Did we have any measurements done in 6.5, which would demonstrate the problem?
http://hg.netbeans.org/jet-main/rev/9e4eeb2a39ec
Integrated into 'main-golden', will be available in build *200903210201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/9e4eeb2a39ec User: Vita Stejskal <vstejskal@netbeans.org> Log: #159607: proper task cancelling when RepositoryUpdater.stop() is called