10 Aug
2009
10 Aug
'09
3:24 p.m.
On Mon, Aug 10, 2009 at 1:41 PM, Sergiu Dumitriu <sergiu(a)xwiki.com> wrote:
Here I modified XWSocialModule to look like this:
//bind(PersonService.class).to(PersonServiceXW.class);
PersonServiceXW psxw = (PersonServiceXW)
Utils.getComponent(SocialServiceComponent.class, "PersonServiceXW");
bind(PersonService.class).toInstance(psxw);
The PersonServiceXW code is:
public Future<Person> getPerson(UserId userId, Set<String> fields,
SecurityToken token) throws ProtocolException
{
Person person = new PersonXW();
person.setId("XWiki.Julia");
if (!documentAccessBridge.exists("XWiki.Julia"))
//some code
}
//some other code
}
The outcome:
I get a NPE when trying to get the context from DefaultExtension, exactly
like the one send earlier in a previous mail
(stacktrace here http://ana-s-private-labs.pastebin.com/m655cdf70)
What could be going wrong here ?
Thanks,
Anamaria
Anamaria Stoica wrote:
I already had listed the Guice listener after the XWiki one in my web.xml.
<!-- Initializes XWiki -->
<listener>
<listener-class>org.xwiki.container.servlet.XWikiServletContextListener</listener-class>
</listener>
<!-- Shindig Guice listener -->
<listener>
<listener-class>org.apache.shindig.common.servlet.GuiceServletContextListener</listener-class>
</listener>
It looks like you can bind an instance to type in
Guice. This is done
either
with Instance Bindings,
@Provides Methods or Provider Bindings, depending on the complexity of
the
class.
(http://code.google.com/p/google-guice/wiki/Bindings)
All bindings are defined in a class that extends AbstractModule, this
would
be
XWSocialModule in my code (
https://svn.xwiki.org/svnroot/xwiki/sandbox/gsoc/opensocial/xwiki-social-op…
).
These modules are then passed as arguments to Guice.createInjector(),
which
builds the injector.
In my application, the injector is build by GuiceServletContextListener (
http://svn.apache.org/repos/asf/incubator/shindig/trunk/java/common/src/mai…
)
This servlet takes the context parameters defined
in my web.xml; these
are:
<context-param>
<param-name>guice-modules</param-name>
<param-value>
org.apache.shindig.common.PropertiesModule:
org.apache.shindig.gadgets.DefaultGuiceModule:
org.apache.shindig.gadgets.oauth.OAuthModule:
org.apache.shindig.common.cache.ehcache.EhCacheModule:
org.xwiki.opensocial.social.XWSocialModule
</param-value>
</context-param>
<listener>
<listener-class>org.xwiki.container.servlet.XWikiServletContextListener</listener-class>
</listener>
Now, all I need to do is bind the instance of PersonServiceXW after it
has
been initialized by XWiki's Component
Manager.
The binding will be done in XWSocialModule, using one of the instance
binding methods (Instance Bindings,
@Provides Methods or Provider Bindings).
My questions are:
1. How do I make sure PersonServiceXW has been initialized already by the
XWiki CM before binding it for Guice ?
List GuiceServletContextListener AFTER XWikiServletContextListener in
web.xml. The servlet spec specifies that listeners are called in the
order they are encountered in web.xml, and XWikiServletContextListener
is the one that starts our component manager. 2. How do I get the initialized PersonServiceXW
instance from
XWSocialModule?
com.xpn.xwiki.web.Utils.getComponent(PersonServiceXW.class)
--
Sergiu Dumitriu
http://purl.org/net/sergiu/
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