-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Eric,
On 6/28/2010 11:37 PM, Eric P wrote: > I've been loading up my web.xml with context and init params for my > first app, but I'm thinking at some point it'd be nice to tweak these > values on the fly while the app is running. > > What are some good practices to accomplish this? > > I'm leaning towards storing all application variables in a database > table w/one record, and loading these values into the application scope > w/a servlet on app startup. Then if I need to tweak any values I could > update the db record and hit this servlet to reload all the application > scope vars. I think this seems like a reasonable idea. I would use a ServletContextListener to trigger the initial load from the db or other data source (properties file, etc.). You could even use variables from web.xml in <init-param>s if you want. The only caveat to this option is that you can't very well change web.xml during runtime and re-load the vars. Instead, you'd have to have a mechanism to change those variables either manually and individually (like an admin "system settings" page), or load from another data source, at which point you may as well forget <init-param>s in the first place. You'll want to use a servlet, of course, for re-loading your settings from file/db/etc. I would recommend making the aforementioned ServletContextListener and this servlet share a helper class that loads and settings and puts them into the application scope. Heck, you can even use a single class that is a servlet but also implements ServletContextListener, and have everything in one class. Hope that helps, - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkwv7SUACgkQ9CaO5/Lv0PAyBQCggcLWFKXPqTSksO5dUVORJ8ih LtQAoK6wZbIArJSQe1pZ9fqeGWtn/PvV =Vdua -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
