[JCR-3775] Avoid lock contention in ISO8601.parse()

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8
• Component/s: jackrabbit-jcr-commons
• Assignee: Jukka Zitting
• Reporter: Jukka Zitting
• Created: 25/Apr/14 19:37
• Updated: 18/Jun/14 09:53
• Resolved: 25/Apr/14 20:00

Description

The ISO8601.parse() method calls the synchronized TimeZone.getTimeZone() method, which causes lock contention in concurrent code that frequently parses ISO8601 strings.

To avoid the synchronization, we could use a static flyweight map of all known time zones, and only fall back to the getTimeZone() method if some unknown time zone is encountered.