November 2002
Intermediate to advanced
464 pages
14h 34m
English
Content preview from Programming Jakarta StrutsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Performance and Scalability Gotchas
This section presents several well-known issues that may affect performance and scalability for your Struts applications. This section is not meant to be exhaustive, but rather to single out a few of the more serious concerns.
Request Scope Versus Session
Memory is limited. You can purchase
more memory for a machine, but at some point you’ll
stop receiving the same return on your investment.
It’s very common to store objects and data in the
user’s HttpSession. In some
cases, this might be the only way to achieve a particular
requirement. However, you must consider the effect that storing
objects and data in the session has on an application.
The more information and objects that are stored in the session, the more you need to worry about scalability. Say that you store 0.5 MB worth of data for a single user. If the application were loaded with 1000 concurrent users, that would equal 500 MB (0.5 GB) worth of memory.
Tip
Don’t forget that there are other resources taking up memory, not just user sessions. There’s application-scope data, the rest of the Struts framework, your application components, the container itself, the JVM, and so on. You must consider all of these factors.
As you can see, using the session to store data can quickly eat up
memory. A better alternative is to use the
HttpServletRequest to temporarily store data that can be used by other components and then reclaimed by the garbage collector when the request is completed. With ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.