[perf] do not call default VariableResolver / PropertyResolver when no custom
instance is set
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Key: MYFACES-3426
URL: https://issues.apache.org/jira/browse/MYFACES-3426
Project: MyFaces Core
Issue Type: Improvement
Components: JSR-314
Reporter: Leonardo Uribe
Assignee: Leonardo Uribe
Doing some performance tests I notice that even if no VariableResolver /
PropertyResolver is set, when resolving EL expressions the code goes directly
through that path, doing some unnecessary operations or calling some specified
ELResolvers more than once.
To prevent that, we can check if it was installed a custom VariableResolver /
PropertyResolver and if it is not found, let the EL chain to continue its
route. For example, DefaultPropertyResolver has an extra call to
FacesContext.getCurrentInstance() and with this code, we prevent that call.
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