RFR: 6988220: java.lang.ObjectName use of String.intern() causes major performance issues at scale

[Frederic Parain]

This a simple fix to solve CR 6988220:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6988220

The use of String.intern() in the ObjectName class prevents
the class the scale well when more than 20K ObjectNames are
managed. The fix simply removes the use of String.intern(),
and uses regular String instead. The Object.equals() method
is modified too to make a regular String comparison. The
complexity of this method now depends on the length of
the ObjectName's canonical name, and is not impacted any
more by the number of ObjectName instances being handled.

The Webrev:
http://cr.openjdk.java.net/~fparain/6988220/webrev.00/

I've tested this fix with the jdk_lang and jdk_management
test suites.

Thanks,

Fred

-- 
Frederic Parain - Oracle
Grenoble Engineering Center - France
Phone: +33 4 76 18 81 17
Email: Frederic.Parain at oracle.com