RE: [cinjug-users] Struts action - thread-safe code

["Arnett, Matt" <Matt.Arnett@xxxxxxxxxx>]

Here's a good article about being thread safe in Servlets...same applies to 
Struts Action classes.
http://www.javaworld.com/javaworld/jw-07-2004/jw-0712-threadsafe.html
 
-Matt

        -----Original Message----- 
        From: Alexander V [mailto:mzuknn@xxxxxxxxx] 
        Sent: Wed 5/11/2005 10:31 PM 
        To: Mike Helmick 
        Cc: users@xxxxxxxxxx 
        Subject: Re: [cinjug-users] Struts action - thread-safe code
        
        

        Thank you very much!
        
        --- Mike Helmick <helmick@xxxxxxxxx> wrote:
        >
        > short answer: no.
        >
        > rewrite like so
        > class SomeAction extends Action {
        >
        >   public ActionForward execute(request, form){
        >     Object someObject = new Object();
        >     someObject.toString(); // is it OK?
        >   }
        >
        > }
        >
        > now... .if the instance of the object should only be
        > created once 
        > then you can make it private, but you're going to
        > want to
        > synchronize around it. (bad performance)
        >
        > generally the only member variables in an action
        > should be (in my 
        > opinion)
        >    1) a static handle to the logger
        >    2) static final constants that don't fit better
        > somewhere else 
        > (chances are they fit better somewhere else on in a
        > properties file)
        >
        > hope that helps
        > mike helmick
        >
        >
        ------------------------------------------------------------------------
        >
        > ----------------------
        > Michael T Helmick,  M.S. 2004 NKU, B.S. 2000 XU
        > Ph.D. Student - University of Cincinnati, College of
        > Engineering
        >      Web: http://mikehelmick.com/
        >
        ------------------------------------------------------------------------
        >
        > ----------------------
        > "we can sleep when we're dead."
        >
        > On May 11, 2005, at 9:33 PM, Alexander V wrote:
        >
        > > Hi,
        > > Iâve a question about Struts action class.
        > > Struts documentation tells:
        > > Actions must be programmed in a thread-safe
        > manner,
        > > because the controller will share the same
        > instance
        > > for multiple simultaneous requests. This means you
        > > should design with the following items in mind:
        > > â    Instance and static variables MUST NOT be
        > used to
        > > store information related to the state of a
        > particular
        > > request. They MAY be used to share global
        > resources
        > > across requests for the same action.
        > > â    Access to other resources (JavaBeans, session
        > > variables, etc.) MUST be synchronized if those
        > > resources require protection. (Generally, however,
        > > resource classes should be designed to provide
        > their
        > > own protection where necessary.
        > > So my question: Is this actionâs class a
        > thread-safe?:
        > >
        > > class SomeAction extends Action {
        > >  private Object someObject;
        > >  public ActionForward execute(request, form){
        > >    someObject = new Object();
        > >    someObject.toString(); // is it OK?
        > >  }
        > > }
        > >
        > > Thanks
        > >
        > >
        > >
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