Hi Kaspar, I think you'd rather take a look at HiveMind interceptors rather than factories. You can create an Interceptor that will be called before and after any method of another service. There are several ways to create interceptors in HiveMind, take a look at HiveMind website to see simple examples.
If you want to see a real-life implementation of such a system you may take a look at hivetranse (http://hivetranse.sourceforge.net) which implements the same kind of behavior as you are looking for. I think you could quite easily adapt one of the numerous hivetranse interceptors (choose one -the simples- as an example). Cheers Jean-Francois -----Original Message----- From: Kaspar Fischer [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 05, 2007 7:32 PM To: [email protected] Subject: Using Hivemind to wrap a transaction around a request [Note: This is a cross-post; I have initially posted to the list [EMAIL PROTECTED] but I guess the issue is more related to hivemind, so I post here.] Hi list, I need to wrap "begin transaction" and "end transaction" actions around a task (a Tapestry web request, actually). I've read about Hivemind, http://www.nabble.com/hivemind-factory-service-tf251931.html#a704856 and configured a service point (see below). This works very well: my transaction is created, but I cannot see when it is ended (committed/ rolled back). More precisely, I am struggling with: * What method is called on the object created by the factory when it is discarded? It is threadDidDiscardService(), right? * How can I catch exceptions from my actual task so that I can do a rollback instead of a commit? I am new to Hivemind, so please excuse these rather simple questions. Many thanks for you patience! Kaspar -- Here's my configuration: <service-point interface="org.my.tapestry.alfresco.AlfrescoTransactionContext" id="alfrescoContext"> <invoke-factory service-id="AlfrescoTransactionFactory" model="threaded" /> </service-point> <service-point interface="org.apache.hivemind.ServiceImplementationFactory" id="AlfrescoTransactionFactory" parameters-occurs="none"> <create-instance class="org.my.tapestry.alfresco.AlfrescoTransactionFactory" /> </service-point> Here is my factory: public class AlfrescoTransactionFactory implements ServiceImplementationFactory, Discardable { public Object createCoreServiceImplementation (ServiceImplementationFactoryParameters factoryParameters) { System.err.println("createCoreServiceImplementation"); // gets called! UserTransaction transaction; ServiceRegistry serviceRegistry; try { transaction = AlfrescoApplicationInitializer.createAndBeginAuthenticatedTransaction (true); serviceRegistry = AlfrescoApplicationInitializer.getServiceRegistry(); } catch (Exception e) { throw new ApplicationRuntimeException("Could not create an Alfresco transactoin.", e); } return new AlfrescoTransactionContextImpl(transaction, serviceRegistry); } public void threadDidDiscardService() { System.err.println("threadDidDiscardService"); // never called! // ... end the transaction here (todo) } }
