[jboss-jira] [JBoss JIRA] (JGRP-2042) Improve performance of Message#writeHeader

[Sanne Grinovero (JIRA)]

Sanne Grinovero created JGRP-2042:
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             Summary: Improve performance of Message#writeHeader
                 Key: JGRP-2042
                 URL: https://issues.jboss.org/browse/JGRP-2042
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Sanne Grinovero
            Assignee: Bela Ban
            Priority: Minor


The following stacktrace, taken with JFR, is highlighting a CPU consumer which could be optimised.

{noformat}Stack Trace	Sample Count	Percentage(%)
java.util.IdentityHashMap.get(Object)	66	2.224
   org.jgroups.conf.ClassConfigurator.getMagicNumber(Class)	66	2.224
      org.jgroups.Message.writeHeader(Header, DataOutput)	66	2.224
{noformat}

One idea could be to use an ad-hoc implementation of Map which takes advantage of the key being a {{Class}}. An interesting alternative would be to avoid the map lookup altogether, by having the Header expose a method like "writeMagicNumber(DataInput to)".



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