This approach can not be used with app-servers that
doesn't keep the identity (ie. primary key) on
entities in the pool.
--- Floyd Marinescu <[EMAIL PROTECTED]>
skrev:
> Hi everyone,
>
> Most appservers re-load your entity bean before
> each transaction call,
> to ensure consistency with the database. However, if
> you can ensure that the
> database won't be changed by anyone except your app.
> server, these numerous
> and expensive load calls should be avoided. A bean
> should only be loaded
> when it is activated (associated with a particular
> instance).
>
> In weblogic, you can set an isDBShared deployment
> flag to be false,
> and weblogic will only call ejbLoad() once, just
> after activation.
>
> The innovation I wanted to get some from you
> guys on,is how to mimic
> this isDBShared behaviour in app.servers that don't
> support it.
>
> The solution seems simple, just make your own
> isDBShared flag, set it
> to false, and in your entity beans, have another
> flag called isLoaded.
> The isLoaded flag should be set to false upon
> passivation, and set to
> true in ejbLoad(), after loading is complete.
>
> Now when a transaction is about to happen, your
> app.server will call
> ejbLoad. At this point, before loading anything,
> have the following code
> block:
>
> if ( !isDBShared )
> if ( isLoaded )
> return
>
> Now after loading, just set isLoaded to true,
> and your done! Your bean
> will not be re-loaded until it has been associated
> with a new instance
> (after passivation-activation).
>
> The isLoaded flag, together with the isModified
> flag should give you
> an in-memory database, and now OO zealots like me
> will no longer have to
> write JDBC code in "getter" methods cause its
> "supposedly faster than going
> through the entity bean layer! :)
>
> Floyd
>
>
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