I was reading Struts2 In Action, and it says for each request an ActionContext
, a ValueStack
and an Action
instance are created, so they are thread safe. I was wondering how does the framework manages session, because it can't be stored in these locations, where does the actual Map gets stored, and how concurrent access to that Map is managed by the framework?
Struts2 Session Storage Location and Management
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The http session is stored in the
SessionMap
which is among the other context maps is stored in the action context by the dispatcher when serving a request. The session map is a wrapper for http session object and operations such asget
/put
are synchronized using a http session object monitor. It simply synchronizes the access to http session attributes, however providing aMap
implementation.