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Changes relating to bug 283731 - [target] Remove target state dependence on preferences

Changes made:

  • Improved tracing, no more cache option, new modeloption, displays model creation time
  • Deprecated all target platform preferences from ICoreConstants (internal)
  • Deprecated TARGET_CHANGED and ENVIRONMENT_CHANGED from IModelProviderEvents (API)
  • PDEState is no longer cached (<100 ms performance hit for standard platform, >200ms gain for large target)
  • Changing target platforms now does not do a removal/add/reset, instead all content is reset
  • TargetPlatformService now holds on to a resolved target definition for fast lookups
  • p2 target locations are not marked as dirty on creation avoiding pinging remote sites
  • Binary compatible API change in we cannot initialize the plug-in registry from this method as the order has changed. Previously, the models were created from preferences and the target was based on that. Now, the models are based on the target.

Still to finish:

  • DONE Look at performance bottlenecks (see below)
  • DONE How to recover from cancelled job
  • DROPPED Look at ways to delay any p2 operation that is long running unless user can cancel
  • DONE (for some wizards) Provide progress reporting when loading models in wizard or preference page
  • DONE Reuse existing target definition in import wizards
  • DROPPED Better recognize when target content on disk has changed
  • DONE Provide target status information on preference page, target state view and target status line
  • DROPPED Target always thinks large target workspace is out of synch because two bundles are not marked as duplicates by the target, but are removed later by the PDEState.

Performance impacts:

  • Removing state caching improves performance for larger targets (1000+), slight hit for smaller targets (500-)
  • Model creation is about 100ms longer to resolve target platform
  • 100ms from above could be gained back by not reading the manifest files 2 (or 3 times)
  • p2 targets are very fast if everything is downloaded, any missing files cause long running operations
  • p2 targets were changed to not ping remote sites on creation

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