John,
That's definitly a different perspective than the one had, and it seems to
make a lot of sense. I would be interested see some code if its not too much
trouble. I greatly appreciate the insight.
Mike
From: "John Coleman" <[EMAIL PROTECTED]>
Reply-To: "Tapestry users" <[email protected]>
To: "Tapestry users" <[email protected]>
Subject: Re: Injecting service into ASO
Date: Fri, 17 Feb 2006 08:33:48 -0000
Hi Mike,
Sorry to not address your question directly, but from an architectural
perspective, do you really want persistence implementation dependant code
in
your application objects? For most projects I know this is not a big deal
as
you choose your persistence engine and stick to it.
One solution I came up with was to implement interfaces for my persistent
entities, then implement a service in HiveMind that implements that
interface. The actual mechanics of accessing the data is then hidden from
application code. Really if you use HM, you must provide an implementation
of an interface, and it should be fully self contained, so that it is
readily pluggable with some other implementation without any need of any
other code or configuration. That as far as I gather is the spirit of HM.
I provide a HM service that can take the Cayenne classes and add the
interface implementation to them so they can deliver back to the
application. It works nicely. I still have put an entry in web.xml so that
a
session based context is available off the thread for the persistence layer
to use. Ideally I would like a fully enclosed solution, with no references
to the persistence mechanism other that what implementation you choose in
the hivemodule.
I can provide working code if you are interested in this idea.
John
----- Original Message -----
From: "Mike Pestorich" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, February 17, 2006 8:01 AM
Subject: Injecting service into ASO
> I am trying to contribute an object to tapestry's ASOs with session
scope
> and inject (or wire in) a Cayenne DataContext. I receive this error:
>
> java.lang.NoSuchMethodException
> setFactory
> Stack Trace:
>
org.apache.hivemind.schema.rules.InvokeParentRule.findMethod(InvokeParentRul
e.java:127)
>
org.apache.hivemind.schema.rules.InvokeParentRule.begin(InvokeParentRule.jav
a:58)
> org.apache.hivemind.impl.SchemaElement.fireBegin(SchemaElement.java:228)
>
org.apache.hivemind.impl.SchemaProcessorImpl.processElement(SchemaProcessorI
mpl.java:255)
>
org.apache.hivemind.impl.SchemaProcessorImpl.processNestedElements(SchemaPro
cessorImpl.java:277)
>
org.apache.hivemind.impl.SchemaProcessorImpl.processElement(SchemaProcessorI
mpl.java:257)
>
org.apache.hivemind.impl.SchemaProcessorImpl.processRootElement(SchemaProces
sorImpl.java:235)
> ...
>
> I am new to hivemind and tapestry and I know that there are other ways
of
> doing this (and actually have got it to work those other ways) but am
trying
> to do things the way the tapestry and hivemind documentation preach. I
have
> been stuck on this for a little while now and it seems to me that what I
am
> trying to do should be working based on the documentation I have read.
> However, I just reviewed a previous post on this list from last December
> "Injecting registry services to POJOS" and it looks like this person had
the
> same problem as me. From that post it looks like he eventually solved it
> using hiveutils. Before I add another jar to my project and head in a
> different direction, I would like to know what I am doing or where my
> thinking is wrong here.
>
> ===web.xml===
>
> <web-app>
> ...
> <listener>
>
<listener-class>org.objectstyle.cayenne.conf.WebApplicationContextProvider</
listener-class>
> </listener>
> ...
> </web-app>
>
> ===DataContextService.java===
>
> package com.pestorich.tapestry;
>
> import org.objectstyle.cayenne.access.DataContext;
>
> public interface DataContextService {
>
> public DataContext getDataContext();
>
> }
>
> ===DataContextServiceImpl.java===
>
> package com.pestorich.tapestry;
>
> import org.objectstyle.cayenne.access.DataContext;
>
> public class DataContextServiceImpl implements DataContextService {
>
> public DataContext getDataContext() {
> return DataContext.getThreadDataContext();
> }
> }
>
> ===Session.java===
>
> package com.pestorich.tapestry;
>
> import java.io.Serializable;
> import org.objectstyle.cayenne.access.DataContext;
> import com.pestorich.tapestry.DataContextService;
>
> public class Session implements Serializable {
>
> private static final long serialVersionUID = 1L;
> private DataContextService _dataContextService;
>
> public Session() {}
>
> public void setDataContextService(DataContextService dataContextService)
{
> _dataContextService = dataContextService;
> }
>
> public DataContext getContext() {
> return _dataContextService.getDataContext();
> }
> }
>
> ===hivemodule.xml===
>
> <module id="com.pestorich.tapestry" version="1.0.0">
> <service-point id="DataContextService">
> <invoke-factory>
> <construct class="DataContextServiceImpl" />
> </invoke-factory>
> <interceptor service-id="hivemind.LoggingInterceptor" />
> </service-point>
> <service-point id="Session">
> <invoke-factory>
> <construct class="Session" />
> </invoke-factory>
> </service-point>
> <contribution configuration-id="tapestry.state.ApplicationObjects">
> <state-object name="Session" scope="session">
> <invoke-factory object="service:Session" />
> </state-object>
> </contribution>
> </module>
>
>
> Thanks for any help or criticism in advance. It's all greatly
appreciated
:)
>
> Mike
>
>
>
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