As long as there are no synchronization issues with your Action class then it shouldn't be a bottleneck. I don't even know why an application server would create more than one instance of a servlet. The doGet() method on a servlet or the process() method on an Action class can be called by as many concurrent threads as your application server wants to use and it shouldn't be a problem. There is no waiting or queueing going on.
Every thread gets their own copy of the local variables in the method. You can have instance variables in the Action class (like a Business Delegate or session bean home interface) as long as they are created once in the constructor and only contain "thread safe" methods with no synchronization issues. This is not to say that Struts doesn't have some overhead but so do EJBs, databases, networks, etc. You use them because they make your code more maintainable and increase productivity. Performance problems are almost always going to come from bad code or database mis-use rather than a framework like Struts. Hal > -----Original Message----- > From: David Cherryhomes [mailto:[EMAIL PROTECTED]] > Sent: Friday, May 10, 2002 6:15 PM > To: Struts Developers List > Subject: RE: Scalability question > > > I'm sorry, maybe I was unclear. I am not challenging the > usefulness of Struts, I am well aware of the vast amount of > functionality that the framework encompasses. I am currently > using Struts as a core part of the MVC approach in my enterprise > application. My question is about the scalability of Struts > Action classes. > > It is my understanding that a Servlet engine will create new > instances/threads of a Servlet as needed (similar to stateless > session beans), and hence is very scalable for multiple > concurrent requests. My understanding is that an Action class, > on the other hand, is stored as an instance variable. The > question is this: if I have a class that performs a massive > amount of business processes (inclusive of attaching to multiple > EJB's), will the multiple concurrent requests end up queued in a > wait status until each one is finished processing, or is there a > multiple instance/thread approach to Action classes (similar to > a Servlet engine with Servlets)? > > The enterprise application I'm working on isn't for some > website, but a truly web-deployed enterprise app which must > scale to thousands of concurrent users with millions of records > in the DB. Thus, performance is a HUGE concern (e.g., a wait of > 500 miliseconds is about the max permitted). > > Thanks > > --- James Mitchell <[EMAIL PROTECTED]> wrote: > > Yes, you can create your entire web site with only servlet > > filters, jsp, and > > a few beans. > > > > And at some point you will find out what struts does for you > > (the hard way) > > and why it is superior to all other Java Web Application > > Development > > Frameworks. > > > > I hope this helps. > > > > JM > > > > "Its a dog-eat-dog world out there, and I feel like I'm > > wearing milkbone > > underwear!" > > Guess who? > > > > > > > -----Original Message----- > > > From: David Cherryhomes [mailto:[EMAIL PROTECTED]] > > > Sent: Friday, May 10, 2002 5:27 PM > > > To: Struts Developers List > > > Subject: Scalability question > > > > > > > > > Have there been any solid tests in regards to the > > scalability of > > > using the Action Servlet and Action class (as opposed to > > using a > > > single Filter servlet which forwards to other Servlets)? I > > am > > > especially concerned since my Action class connects (thru a > > > BusinessDelegate) to one or more EJB's that are really > > > responsible for processing the business logic. > > > > > > Any thoughts on this would be greatly appreciated. > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Yahoo! Shopping - Mother's Day is May 12th! > > > http://shopping.yahoo.com > > > > > > -- > > > To unsubscribe, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > > __________________________________________________ > Do You Yahoo!? > Yahoo! Shopping - Mother's Day is May 12th! > http://shopping.yahoo.com > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> >
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