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https://issues.apache.org/jira/browse/LOG4J2-1595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma updated LOG4J2-1595:
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Description:
Review current Filter implementation classes and change them to be garbage-free
where feasible. Document on the web site which filters are garbage free and
which are not.
h4. Current status
* (-) BurstFilter (allocates, non-trivial to change)
* (/) CompositeFilter (adding & removing elements produces garbage for thread
safety, no allocation in steady state)
* (/) DynamicThresholdFilter (garbage free)
* LevelRangeFilter (can be garbage free after overriding unrolled vararg
methods)
* MapFilter (creates iterator for each event to loop over the map. Easy to
change by constructing MapFilter with an ArrayContextData instead of a Map, and
overriding unrolled vararg methods)
* MarkerFilter (can be garbage free after overriding unrolled vararg methods)
* (-) RegexFilter (not garbagefree due to JDK regex library)
* (-) ScriptFilter (not garbagefree: creates new Binding object for each event)
* StructuredDataFilter (TBD)
* ThreadContextMapFilter (creates iterator for each event to loop over the
map. Easy to change by constructing ThreadContextMapFilter with an
ArrayContextData instead of a Map, and overriding unrolled vararg methods)
* ThresholdFilter (can be garbage free after overriding unrolled vararg methods)
* TimeFilter
was:
Review current Filter implementation classes and change them to be garbage-free
where feasible. Document on the web site which filters are garbage free and
which are not.
h4. Current status
* BurstFilter (allocates, non-trivial to change)
* CompositeFilter (adding & removing elements produces garbage for thread
safety, no allocation in steady state)
* DynamicThresholdFilter (garbage free)
* LevelRangeFilter (can be garbage free after overriding unrolled vararg
methods)
* MapFilter (creates iterator for each event to loop over the map. Easy to
change by constructing MapFilter with an ArrayContextData instead of a Map, and
overriding unrolled vararg methods)
* MarkerFilter (can be garbage free after overriding unrolled vararg methods)
* RegexFilter (not garbagefree due to JDK regex library)
* ScriptFilter (not garbagefree: creates new Binding object for each event)
* StructuredDataFilter (TBD)
* ThreadContextMapFilter (creates iterator for each event to loop over the
map. Easy to change by constructing ThreadContextMapFilter with an
ArrayContextData instead of a Map, and overriding unrolled vararg methods)
* ThresholdFilter (can be garbage free after overriding unrolled vararg methods)
> (GC) Avoid allocating temporary objects in Filter implementations
> -----------------------------------------------------------------
>
> Key: LOG4J2-1595
> URL: https://issues.apache.org/jira/browse/LOG4J2-1595
> Project: Log4j 2
> Issue Type: New Feature
> Components: Filters
> Affects Versions: 2.6.2
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.7
>
>
> Review current Filter implementation classes and change them to be
> garbage-free where feasible. Document on the web site which filters are
> garbage free and which are not.
> h4. Current status
> * (-) BurstFilter (allocates, non-trivial to change)
> * (/) CompositeFilter (adding & removing elements produces garbage for thread
> safety, no allocation in steady state)
> * (/) DynamicThresholdFilter (garbage free)
> * LevelRangeFilter (can be garbage free after overriding unrolled vararg
> methods)
> * MapFilter (creates iterator for each event to loop over the map. Easy to
> change by constructing MapFilter with an ArrayContextData instead of a Map,
> and overriding unrolled vararg methods)
> * MarkerFilter (can be garbage free after overriding unrolled vararg methods)
> * (-) RegexFilter (not garbagefree due to JDK regex library)
> * (-) ScriptFilter (not garbagefree: creates new Binding object for each
> event)
> * StructuredDataFilter (TBD)
> * ThreadContextMapFilter (creates iterator for each event to loop over the
> map. Easy to change by constructing ThreadContextMapFilter with an
> ArrayContextData instead of a Map, and overriding unrolled vararg methods)
> * ThresholdFilter (can be garbage free after overriding unrolled vararg
> methods)
> * TimeFilter
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