On 28/10/2010 18:31, falva...@geocom.com.uy wrote:
> Dear All,
> I'm currently using Tomcat 6.0.28 and having some doubt on
> how to solve and implement this problem:
> My webapp has a MySQL Database with a table
> named "parameters", in which we have just two columns ("property" and
> "value"). This table is acceded many times but doesn't change often.
>
> For performance purposes I want to save this
> parameters in the user's tomcat session, so they are read from memory and
> not database. So far so good.Do you actually know that this is a performance problem, or are you guessing that it is? > Now the problem: how can I tell this sessions > that an attribute has changed? Using the session will mean that you have duplicate copies of this information in each session. > I had suggestions of using "context variables" instead of > "session variables", but that didn't solve the problem. *If* you need to do this, using the Context is probably better. I would suggest that you created a class which periodically updated all the values by selecting the data in the DB and storing the result in the Context. Implementing a ServletContextListener will give you access to the ServletContext and two methods, for app startup & shutdown, which you can use to start the periodic process, and properly stop it (very important). You may consider using a Timer, or something from the java.util.concurrent package. p > Any help in this matter is more than welcome. I have no problem in changing > the approach, and may be not use sessions at all. > > Thanks in advance. > > Best regards, > > Federico Alvarez. > > Info: > > Tomcat 6.0.28 > Java 1.6 > MySQL 5.5 > > NOT USING HIBERNATE, so 2nd Level cache is not an option
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