[news.eclipse.tools] Re: Resource Changes at Start-Up

["Jeff McAffer" <jeff_mcaffer@xxxxxxx>]

Kevin,

As you observed, resource change listeners get notified from the time they
are registered.  Your situation is interesting because it highlights this as
well as the fact that one cannot rely on their plugins being run everytime
the platform is run.  For example, what happens if the user starts up the
platform and doesn't do work involving your plugin?  Its not needed and so
will not be activated.  They may still change resources in which you are
interested.

The easiest way to handle this is to use the ISaveParticipant facilities.
This allows you to register your desire for a delta the next time YOU are
started (see ISaveContext.needDelta()).  The next time your plugin is run,
it will have an ISavedState available to it.  Using
ISavedContext.processResourceChangeEvents() you can get access to the delta
between the last time YOU saved and the time YOU are starting. (ok, enough
emphasis...)

Note that this mechanism reserves the right to forget very old states and so
may give you a null delta.  In this case you simply assume that it is the
first time you've run and check all your states to ensure consistency.  You
presumably need this capability anyway.

You could also investigate IncrementalProjectBuilders but I don't think this
is applicable here.

Hope that helps

Jeff

"Kevin Bauer" <kmbauer@xxxxxxxxxx> wrote in message
news:9bfokk$44k$1@xxxxxxxxxxxxxxxx
> I have a resource change listener that notifies me when people
> add/remove/change jars in my lib directory.  I need this so that I can
> modify my Java class path on these changes.  I am currently initializing
> this class through my plugin's statup.  However, people can make changes
> to my lib directories before the WebTools plugin is loaded and my listener
> is not notified.  Is there any way to register a ResourceChangeListener to
> catch the initial resource changes?
>