Thanks Rene. I am trying to avoid a situation where I would have to scan the
whole classpath on web app startup. Does struts cache the information about
all action classes somewhere? I am thinking maybe I could simply use that
information , instead of trying to figure out the action classes on my own?
On Tue, Feb 24, 2009 at 4:46 PM, Rene Gielen <gie...@it-neering.net> wrote:
> If your intent is to go for a ObjectFactory implementation / extension, I
> think it would not be necessary to distinct between action or non-action
> classes - just check the bean to build for the EJB annotations, regardless
> what kind of bean that is. Actually, in Struts2 not only action classes are
> candidates for an injection like this - interceptors would also be good
> candidates, maybe even results.
>
> I would really like to see "first class" EJB3 support in S2, and would also
> be glad to help where I can
>
> - Rene
>
> Karan Malhi schrieb:
>
> If a class has a suffix of Action or implements the Action interface, would
>> that automatically be treated as an action class? Would such a class
>> require that it be listed in the struts.xml file?
>>
>>
>> On Sat, Feb 21, 2009 at 11:29 PM, Karan Malhi <karan.ma...@gmail.com>
>> wrote:
>>
>> Thanks Wes,
>>>
>>> Appreciate such a prompt response.
>>>
>>> There are likely to be actions mapped via other means. There are many
>>>> plugins
>>>> available, most prominently the REST plugin and the Convention plugin
>>>> that
>>>> allow our users to map actions without any XML
>>>>
>>>
>>> So a user would need these plugins to map actions without XML. Struts
>>> default behavior would require a user to map the action in the XML file
>>> and
>>> that would be struts.xml, right? So would it be fair to say that if I
>>> parse
>>> the struts.xml file and all included xml files, then I will have a list
>>> of
>>> all available actions in the webapp (assuming user is not using the
>>> plugins
>>> you mentioned) ?
>>>
>>>
>>>> 3. I was planning to write a plugin, but wanted to have access to the
>>>>> ServletContext within the plugin. Could you show me how to do that -- I
>>>>> tried implementing ServletContextAware in the plugin class, but that
>>>>> did
>>>>> not work for me (maybe that interface is only supposed to be
>>>>> implemented
>>>>>
>>>> by
>>>>
>>>>> actions)
>>>>>
>>>> That interface is meant for actions. The best way to get a
>>>> ServletContext
>>>> is
>>>> to do the following from an interceptor -
>>>>
>>>> final ActionContext context = invocation.getInvocationContext();
>>>> ServletContext servletContext = (ServletContext)
>>>>
>>>> context.get(org.apache.struts2.StrutsStaticsSERVLET_CONTEXT);
>>>>
>>>> Although I did not manage to get access to the actual ServletContext, I
>>> believe ActionContext.getContext().getApplication() would give me access
>>> to
>>> the Map of context attributes. Since I just need to read an attribute
>>> from
>>> it, I believe this approach should suffice.
>>>
>>> You may face a few issues though. I've thought briefly about EJB +
>>>> Struts2
>>>> lately and I'll admit to a lack of experience with EJB, but it seems to
>>>> me
>>>> that it would be somewhat difficult to combine the two easily. Many of
>>>> the
>>>> EJB
>>>> annotations can appear on private members (i.e. @PersistenceContext). In
>>>> Struts2, we create actions via our own ObjectFactory, which can be
>>>> overridden
>>>> by a plugin.
>>>>
>>>> On application startup we collect information about all classes which
>>> need
>>> injection. Then when instances of classes are created, we use that
>>> information to perform injection. The plugin which I wanted to write
>>> would
>>> be an ObjectFactory and I intended to override the buildBean method and
>>> perform the injection there. Actually, I just realized that I could get
>>> access to the Map of ServletContext attributes as shown below:
>>> public class OpenEJBObjectFactory extends ObjectFactory{
>>> public Object buildBean(Class clazz, Map map) throws Exception {
>>> Map application = (Map)map.get("application");
>>> // THIS IS WHERE I COULD READ THE ATTRIBUTE AND
>>> // CREATE THE ACTION INSTANCE AND PERFORM INJECTION
>>> }
>>> }
>>>
>>>
>>> I'm not particularly familiar with OpenEJB, but I'd like to help however
>>>> I
>>>> can. So, let me know if you need the help.
>>>>
>>>> Excellent. I really appreciate it. You are already helping in a great
>>> way
>>> by answering my questions. Thank you so much.
>>>
>>> -Wes
>>>> --
>>>>
>>>> Wes Wannemacher
>>>> Author - Struts 2 In Practice
>>>> Includes coverage of Struts 2.1, Spring, JPA, JQuery, Sitemesh and more
>>>> http://www.manning.com/wannemacher
>>>>
>>>>
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>>>>
>>>>
>>>>
>>> --
>>> Karan Singh Malhi
>>>
>>>
>>
>>
>>
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>
--
Karan Singh Malhi
