Cache ScriptEngine and CompiledScript to eliminate filter performance bottleneck#434
Open
Zakaria-Kofiro wants to merge 4 commits intomasterfrom
Open
Cache ScriptEngine and CompiledScript to eliminate filter performance bottleneck#434Zakaria-Kofiro wants to merge 4 commits intomasterfrom
Zakaria-Kofiro wants to merge 4 commits intomasterfrom
Conversation
kevin-mcgoldrick
approved these changes
Oct 15, 2025
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Problem
Filter execution was causing 70-90% CPU spikes and frequent timeouts due to repeated creation of ScriptEngineManager and ScriptEngine instances, plus repeated JavaScript compilation on every filter execution.
Solution
Implemented caching for ScriptEngine instances (per file extension) and compiled JavaScript bytecode (per filter script). ScriptEngine cache uses ConcurrentHashMap with singleton ScriptEngineManager.
Files Changed
ExternalScript.java: Added ScriptEngine cachingScriptRunner.java: Added CompiledScript caching with isolated contexts