Skip filter evaluation for projects without resource filters - #2884
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Pull request overview
Optimizes resource-tree scans by bypassing filter evaluation when a project has no resource filters.
Changes:
- Adds an early return based on the project description’s filter map.
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Resource.filterChildren runs for every directory scanned by a refresh or an isSynchronized walk. Even for a project without any resource filter it allocated two lists and walked the project-relative path up to the root, allocating an IPath and taking a synchronized getFilter call per segment. Return early when the project description holds no filters, which cuts this garbage from the auto-refresh polling path. ProjectDescription.getFilters is now synchronized like the other filter accessors, so the hot path no longer reads the field outside the monitor those accessors use. For every folder below the project root this is still fewer monitor acquisitions than before, because the loop it replaces took one per path segment. Assisted-by: multiple AI agents and layers of automated tooling 🤖
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Resource.filterChildrenruns for every directory scanned by a refresh or anisSynchronizedwalk. Even for a project with no resource filters at all, it allocated two lists and walked the project-relative path to the project root, allocating anIPathand taking a synchronizedgetFiltercall per segment, only to discard everything.This returns early when the project description holds no filters.
ProjectDescription.getFilters()is null exactly in that case, so the check is precise rather than a heuristic, andisFilteredWithExceptionalready guards the same way. The gain shows up in the auto-refresh polling path, which walks whole projects continuously on Linux.FilteredResourceTestpasses unchanged.