Leonardo Uribe created MYFACES-3550:
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Summary: [perf] minimize FacesContext.getCurrentInstance() calls
part II
Key: MYFACES-3550
URL: https://issues.apache.org/jira/browse/MYFACES-3550
Project: MyFaces Core
Issue Type: Improvement
Components: JSR-314
Reporter: Leonardo Uribe
Assignee: Leonardo Uribe
It is still possible to minimize even more the number of calls to
FacesContext.getCurrentInstance(), just doing some small changes in some
methods.
For example, Application.createComponent(String componentType) has an internal
call to FacesContext.getCurrentInstance(), but the variant
Application.createComponent(FacesContext context, String componentType, String
rendererType) does not, because it can be retrieved from the parameter. Since
rendererType can be null according to JSF spec, the result of both methods is
equivalent, so it is possible to use the second variant and save one call per
component that does not have rendererType.
Other important place is when EL evaluation occur (FacesCompositeELResolver),
FacesContext.getCurrentInstance() is always called, but it is preferred to get
the FacesContext from the ELContext first, because a get over a map of 1 or 2
elements will be faster than a ThreadLocal lookup, which is proportional to the
number of threads running.
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