[jboss-jira] [JBoss JIRA] (JGRP-2043) Improve performance of Message#readHeader

Improve performance of Message#readHeader ----------------------------------------- Key: JGRP-2043 URL: https://issues.jboss.org/browse/JGRP-2043 Project: JGroups Issue Type: Enhancement Reporter: Sanne Grinovero Assignee: Bela Ban Priority: Minor Fix For: 4.0 A CPU hot spot highlighed by profiling via JFR: {noformat}Stack Trace Sample Count Percentage(%) java.lang.reflect.Constructor.newInstance(Object[]) 71 2.392 java.lang.Class.newInstance() 71 2.392 org.jgroups.Message.readHeader(DataInput) 71 2.392 {noformat} I'd have expected the reflective constructor to perform well on a recent JVM, but apparently it's not in this case. A theory is that the {{Class}} type being unknown makes this code harder to optimise; needs to be looked into. It might be possible to patch the {{ClassConfigurator}} to provide instances of the required {{Header}} type rather than returning the class, and optimise that instead.