Re: Injecting registry services to POJOS

Raul Raja Martinez Sat, 03 Dec 2005 23:30:04 -0800

I am using the hivemind utilities Hibernate3 session as inhttp://hivetranse.sourceforge.net/quickstart.html#start.config.hibernate3


I can inject it in my regular servlets using the following:



EntityService service = (EntityService)HiveMindFilter
.getRegistry(request)
.getService(com.estudiowebs.CMS.services.EntityService.class);

I can aslo inject it into components and pages using annotations such as@InjectObject(service:...).

but when it comes to Pojos I didn't know what would be the rightapproach, I'll try your method, thanks.


Raul.





Jesse Kuhnert wrote:

Ummm....You can get access to the Registry object, but it's not easy, and
for a good reason.

~Anything~ in tapestry can have a hivemind service injected into it. Esp a
hivemind service, or a DAO, which is what you are doing right?  I don't know
what all of your crazy configs are doing, but I have a hibernate hivemind
service point that looks sort of like:

<service-point id="SessionProxy" interface="org.hibernate.Session">
...//threaded
</service>

I then take this hibernate session, bound to my web thread(or POJO service
thread, or JMS queue thread, or whatever other fun threads I want to use :)
),  and use it without thinking. Sometimes it's in pages/components, but
most often I create a simple DAO that might look like:

<service-point id="SomeDAO" >
<construct class="com.foo.SomeDAOImpl">
<set-service id="SessionProxy" property="session" />
</construct>
</service>

Something like that.. Is this what you're doing?
On 12/4/05, Raul Raja Martinez <[EMAIL PROTECTED]> wrote:

Hi Jean-Francois, first of all thanks for your help,

My pojo is basicaly the menu of my webapp, since everybody will have the
same I thought that the best thing would be to make it an application
scope object and fetch the records at startup. since i have already
declared a Hibernate Session service I wanted to inject that service
into this object so that I could use it to query the objects.

I have also many webservices in the same webapp that are not tapestry
related and I'd like to use these services both in the tapestry and
servlets.

I think this is or would be a common problem for Tapestry 4 users.
Many have already asked how to access the Tapestry hivemind registry
from other objects that are not of type Component or Page. My problem is
that I don't even know if this is posible since someone mentioned in
this newsgroup that the Tapestry hivemind registry wasn't available
directly and also annotations like @InjectObject only work within pages
or components.

Anyway, I'll try your solution,
Is there a newsgroup for Hivemind utilities?

Thanks,

Raul.


Jean-Francois Poilpret wrote:

Hi Raul,

I do not know Tapestry, but I know HiveUtils (I wrote it;-)), the
contribution you describe below seems OK to me (at first sight).

However it depends exactly on what you want to achieve.
In particular is your POJO a singleton in your application, or do you

need

to inject a new instance every time? From your initial Tapestry example,

believe it is a singleton, so when using HiveUtils, you should probably

put

the "cache" attribute to true to make sure HiveUtils will not create

more

than one instance:

<contribution configuration-id="hiveutils.ObjectBuilderObjects">
<object name="globalMenu" cached="true"
class="com.estudiowebs.CMS.DAO.GlobalMenu">
  <inject
object="service:com.estudiowebs.CMS.services.EntityService" />
  <inject-arg />
</object>
</contribution>

Please note however that according to the above config (independently of

the

cache attribute), you need to use hiveutils.ObjectBuilder service to get

the

instance of your object because, you have declared your POJO to require

runtime argument in the constructor ("<inject-arg/>") which means the
constructor for it should look like:
      public GlobalMenu(com.estudiowebs.CMS.services.EntityService
service,
                              MyArgType myarg) {...
NB: MyArgType can be any type.

Then to get the instance of your POJO you need to do:

ObjectBuilder builder =...
GlobalMenu globaleMenu = builder.create("globalMenu", myArg);

where myArg is of type MyArgType.

Is this what you want to do?
Do you really need the extra runtime argument?
If not then it would make it easier to inject globalMenu into other

objects,

services, or configurations by using:
      "object:globalMenu"

I hope it gives you a better view of what you can do and how you can do

it,

now if you need further precisions or if you want to give more details

about

what you want to do, you are welcome.

One last point: HiveUtils is part of the HiveMind Utilities project on
SourceForge (formarly known as "hivetranse"), which is independent of
HiveMind and Tapestry (by independent I talk about the involved persons

and

the communication channels). So it might be better to proceed with this
discussion on the HiveMind Utilities forums, except if this is a common
Tapestry problem.

Cheers

      Jean-Francois

-----Original Message-----
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Raul Raja Martinez
Sent: Sunday, December 04, 2005 5:54 AM
To: [email protected]
Subject: Re: Injecting registry services to POJOS

I was trying to do that using hiveutils, sorry, but still very new to
hivemind and IOC:

<contribution configuration-id="hiveutils.ObjectBuilderObjects">

<objectname="globalMenu"cached="false"class="

com.estudiowebs.CMS.DAO.GlobalM

enu">
  <inject
object="service:com.estudiowebs.CMS.services.EntityService" />
<inject-arg />
  </object>

</contribution>

I just need and example on how to inject one of my services in one of my
POJO so that I can access my hibernate session from my pojos.

Thanks.

Raul.


John Coleman wrote:

HiveMind injects by interface automatically if you use its service

builder

(it will use setter methods of the declared interface type), in

Tapestry

pages you can also use the page to inject services. So you never have

to

use

annotations.

I don't think it matters about the order of instantiation, HM should

insure

every service is set up with the references it needs.

John

----- Original Message -----
From: "Raul Raja Martinez" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, December 03, 2005 11:46 AM
Subject: Injecting registry services to POJOS

Hi,

I have a service in my hivemodule.xml that I'd like to inject in a

Pojo

that at the same time gets loaded as a an application scope object at
startup:

<contribution configuration-id="tapestry.state.ApplicationObjects">
<state-object name="globalMenu" scope="application">
  <create-instance class="com.estudiowebs.CMS.DAO.GlobalMenu" />
</state-object>
</contribution>

This is an object that I load from the database once at startup and I
need to inject my Hivetranse Hibernate3 session service into it so

that

I use that service for loading the object.
Since annotations like @InjectObject are not allowed in regular POJOS
and I don't have access to the Tapestry Registry, I don't really know
what would be the best way to solve this problem

On the other side I have in the same application a couple of servlets
that serve as XML source for a Laszlo application, and I have the same
problem.

Any help is appreciated.


I'd really love to be able to @InjectObject("service....") anywhere


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Re: Injecting registry services to POJOS

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