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.
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There is only one unique instance of the
FacesContextper thread.The
FacesServletcreates aThreadLocal<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 aFacesContext#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
FacesContextinstance is attached as thread local variable to a single thread, no two HTTP servlet requests share the sameFacesContextinstance.