[LOG4J2-1282] Make RingBufferLogEvent::mergePropertiesIntoContextMap allocation-free if possible

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.5
• Component/s: Core
• Epic Link: GC-free
• Assignee: Unassigned
• Reporter: Remko Popma
• Created: 19/Feb/16 11:51
• Updated: 11/Sep/16 17:13
• Resolved: 02/Apr/16 00:39

Description

RingBufferLogEvent::mergePropertiesIntoContextMap is called in the background (consumer) thread for each event.

If configuration properties are specified it allocates the following temporary objects:

• make mutable copy of the ThreadContext map
• iterator over configuration properties map
• for config values containing ${} placeholders, call StrSubstitutor.replace (which creates multiple temporary objects)

(If configuration properties are not specified, no temporary objects are allocated.)

Issue Links

• is superceded by: LOG4J2-1349 Garbage-free ThreadContext map
• is superceded by: LOG4J2-1575 (GC) Store Configuration Properties in List instead of Map to prevent creating temporary iterators