[jboss-jira] [JBoss JIRA] (WFCORE-3466) Add reflection option to org.jboss.as.controller.parsing.ExtensionParsingContext

[David Lloyd (JIRA)]

David Lloyd created WFCORE-3466:
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             Summary: Add reflection option to org.jboss.as.controller.parsing.ExtensionParsingContext
                 Key: WFCORE-3466
                 URL: https://issues.jboss.org/browse/WFCORE-3466
             Project: WildFly Core
          Issue Type: Enhancement
          Components: Domain Management
            Reporter: David Lloyd


As a way to combat aggressive class initialization, WFCORE-1841 added a variant method to {{ExtensionParsingContext}} which allowed a supplier of a parser to be provided.

This has resulted in an explosion of lambda usage; around 150 calls to this method exist, most of which supply constructor references as the {{Supplier}} argument.

We can theoretically save considerable metaspace by doing one of the following:

* Add a variation of the method which accepts a {{Class}} instead of a {{Supplier}}; it uses {{Class.newInstance()}} or {{Class.getConstructor().newInstance()}} to instantiate the parser on demand
* Create a reflective {{Supplier}} implementation which, given a {{Class}}, uses it in this way to construct instances

Performance impact should be very minimal, as the overhead of calling a constructor is less than that of compiling a method reference, and the overhead in metaspace is nearly non-existent in comparison.




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