Re: Tapestry and O/R persitence services

There is an interface net.sf.tapestry.IMonitor which could help you out 
here.

The ApplicationServlet.doService() method delegates to 
AbstractEngine.service().  In this service method gets a monitor instance 
from the AbstractEngine.getMonitor(RequestCycle) method.

This monitors methods are called during the processing of the request, the 
first method begin serviceBegin() and the final method begin serviceEnd().

If an exception, other than PageRedirectException, RedirectException, 
StaleLinkException and StaleSessionException, is thrown the IMonitor method 
serviceException() is called.

The AbstractEngine.getMonitor() method currently returns null, you could 
subclass SimpleEngine and provide your own implementation which could return 
a TransactionMonitor class which implements IMonitor.

TransactionMonitor.serviceBegin() - begin request transaction

TransactionMonitor.serviceEnd() - end request transaction

TransactionMonitor.serviceException() - rollback request transaction

The AbstractEngine.getMonitor() method takes a RequestCycle parameter, so 
you have lots of access to various Servlet stuff.

regards Malcolm

>From: Eric Everman <[email protected]>
>To: Christian Sell <[email protected]>, Neil Clayton 
><[email protected]>
>CC: Norrman Per <[email protected]>, 
>[email protected]
>Subject: Re: [Tapestry-developer] Tapestry and O/R persitence services
>Date: Thu, 16 Jan 2003 17:06:35 -0600
>
>
>At 1/16/2003, Christian Sell wrote:
>>what about making this a generic hook in the framework proper, for anyone 
>>who requires transaction demarcation. After all that is not an 
>>O/R-specific issue..
>
>
>Yes!  This is really what my previous message was getting at.  It doesn't 
>need to be a hook for transaction demarcation specifically, but we do need 
>a hook to mark the beginning and ending of a request, even if it crosses 
>several pages.
>
>Does this exist and I'm just not seeing it?
>
>Eric Everman
>
>
>
>
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