At 08:24 AM 5/28/2001 +0200, J�rn Schrader wrote:
> >This isn't thread-safe -- 2 servlets could create the store at the same
>time.
> >
> >You're better off putting the store initialization into a module that gets
> >imported -- then Python automatically ensures that only one thread imports
> >it at once. (Either that or you should explicitly use a threading.Lock
> >object to make it thread-safe.)
> >
> >If you want to "pre-load" the store when the app server starts up to reduce
>
> >response time, then you can put the import into the __init__.py in your
> >context directory. __init__.py automatically gets imported when the app
> >server starts.
>
>Thanks Geoff for your hint concerning thread-safety. But Ian's way to have a
>Base
>Servlet that cares for store opening is attractive too. Do you think, that
>one can
>mix both methods by having a store initialization module that gets imported
>in
>a base servlet:
Yes, this combined solution is thread-safe, and IMHO it's the best way to
do this, because if you ever needed to change MyPage.Store() to do
something else you'd be able to do so.
- Geoff
># MyObjectStore.py
>from MiddleKit.Run.MySQLObjectStore import MySQLObjectStore
>store = MySQLObjectStore()
>store.readModelFileNamed('MyMiddleKitModel')
>
>
># MyPage.py
>from MyObjectStore import store
>from WebKit.Page import Page
>class MyPage(Page):
> def Store(self):
> return store
>
># MyDerivedPage.py
>from MyPage import MyPage
>class MyDerivedPage(MyPage):
> def writeContent(self):
> currentStore = self.Store()
> # do something with currentStore
>
>Is the above code thread-save.
>
>
>Joern.
>
>
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