In layman speak, what does it mean when somebody says an object is a threadlocal singleton in Java? I was at a lecture about Java Server Faces, and everytime the FacesContext was spoken of - the instructor always reminded us that it is a threadlocal singleton.
There is only one unique instance of the FacesContext
per thread.
The FacesServlet
creates a ThreadLocal<FacesContext>
on the beginning of the HTTP servlet request and removes it on the end of the HTTP servlet response associated with the HTTP servlet request. Whenever you do a FacesContext#getCurrentInstance()
in your JSF code, you'll always get the one and the same instance throughout the entire HTTP servlet request/response processing.
Since HTTP servlet requests are executed by distinct threads and the FacesContext
instance is attached as thread local variable to a single thread, no two HTTP servlet requests share the same FacesContext
instance.
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