-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Howard,
On 4/14/13 9:53 PM, Howard W. Smith, Jr. wrote: > I am definitely relying on user HttpSessions, and I do JPA-level > caching (statement cache and query results cache). pages are > PrimeFaces and primefaces = xhtml, html, jquery, and > MyFaces/OpenWebBeans to help with speed/performance. And right > now, the app handles on a 'few' simultaneous connections/users that > do small and large fetches/inserts from/into relational database. > :) You can tune the JPA caching, etc. to meet your environmental needs, etc., so you don't *need* a huge heap. If you find that you need to be able to improve your performance, you might be able to increase your cache size if it in fact improves things. > sometimes, i do keep large amount of data in user HttpSession > objects, but still being somewhat junior java/jsf developer and > listening to you all on tomcat list and other senior java/jsf > developers, I want to move some of my logic and caching of data > from SessionScoped beans to RequestScoped beans. You might be able to have your cake and eat it, too. There is an interesting class called WeakReference that you can use to interact with the memory manager and garbage-collector. If you have a bunch of stuff cached in the session, as long as you could re-construct the cache given some value (like user_id or whatever), you can make the big, cached stuff in the session into so-called weak-references. If the GC wants to re-claim memory, it can discard weak references and the WeakReference object will then point to null. That allows you to have a nice cache that auto-cleans if you start running low on memory. I've written a Filter and HttpSession wrapper that can do that kind of thing transparently to the application code. I don't actually use it right now -- it was just a proof-of concept -- but it's a quick and dirty way to get caching but also save a safety valve. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJRbDQhAAoJEBzwKT+lPKRY2voP/RejVzXwT9q3Bpq8C85sdmaU rf4l8aSAeHY9iZDuU27dGIPYcM8eD503UFdLxNrLQmsAnIGgecxcybSzTCIaA8Q1 kqtA58KOOkSwjWzSzyLhr7glDELXlB7BW1wiKuclrSE99NLmLQIwt5osvjv6qYxi jPTU0y1LEKs9mXFjCmwpdjxryttMOPL+3NMjYy0PrauwxtWR1uPS3r+1bhkjtbSs srx4aV98bFso7NydTPrbGahOHRnY1s7deNq1AzcaYsKV0ASky5cgagmk9qRyfxMd UBAo4+cxQG2V9ccGO4PR+cuL6JQuLhfxexneFfR+FSbFPCmM9axNBexqi73BL79q 1aOffzSKLc9gS1I7MjXgMwc20K+bDYmnWOsePAJpCIt9Jl3S77AKQYzBWapCXCu0 H+vtVEjvH38fuByNtNTBOonqztw7EFuOAMJWg1vRzWfZyeXSljewdLjw/+jTJYNA iULuGit9BTfIVwT2jaGfVmjebwy47GqaaisK+BF9/gLAGsG9/sSpfnYPOkjGpAZu 1+5nYnGzx8rqlgdPOmxh0MJiJdbLeg7yJxuFnCTe5X7i4wE7jUUkBGmqnWroiYD0 iCxWU81XQMeJDob6WMw2Cori8ZUHt/oBGz3p33ip/NzPihQrlLqqIIx3zYwpM4vt H6hYuvJ+/t8PHKDhHR+K =guqf -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
