Re: Injecting registry services to POJOS

Mon, 05 Dec 2005 12:34:28 -0800

Is this a bug or just me? Please somebody tell me this is not a bug, I've been trying to solve this problem for three days, maybe is just an easy fix and I don't have enough hivemind experience 

Raul Raja Martinez wrote:
I'm trying to reference a service from a ApplicationState contribution and I find two weird behaviors. 


1. If the service calls a class directly instead of an interface 
auto-wiring doesn't work and my service doesn't get injected my other 
EntityService.



2. If the service is in fact an Interface with its implementation, I get 
the following exception:


org.apache.hivemind.ApplicationRuntimeException

Error invoking method setFactory on 
[EMAIL PROTECTED] (at 
jar:file:/Users/dobleerre/Public/Laszlo/openlaszlo-3.0.2/Server/tomcat-5.0.24/webapps/com.estudiowebs.CMS/WEB-INF/lib/tapestry-4.0-beta-13.jar!/META-INF/tapestry.state.xml, 
line 76, column 47): setFactory
location: 
jar:file:/Users/dobleerre/Public/Laszlo/openlaszlo-3.0.2/Server/tomcat-5.0.24/webapps/com.estudiowebs.CMS/WEB-INF/lib/tapestry-4.0-beta-13.jar!/META-INF/tapestry.state.xml, 
line 76, column 47

71     The factory object that will create the state object as needed.
72     </attribute>

73   
74     <rules>

75     <push-attribute attribute="object"/>
76     <invoke-parent method="setFactory"/>
77     </rules>

78   
79     </element>

80     </element>
81     </schema>

java.lang.NoSuchMethodException
setFactory


Here is the code that I'm using:

hivemodule.xml
--------------------------------------------------------------------
<contribution configuration-id="tapestry.state.ApplicationObjects">
 <state-object name="globalMenu" scope="application">
  <invoke-factory object="service:CMS.GlobalMenu" />
 </state-object>
</contribution>


<service-point id="GlobalMenu" 
interface="com.estudiowebs.CMS.DAO.IGlobalMenu">

 <invoke-factory model="singleton">
  <construct class="com.estudiowebs.CMS.DAO.GlobalMenu"/>
 </invoke-factory>
</service-point>


GlobalMenu.java
--------------------------------------------------------------------
public class GlobalMenu extends Menu implements IGlobalMenu{

 private EntityService service;

 public void setService(EntityService service) {
  this.service = service;
 }

 public GlobalMenu() {
  Menu m = null;
  System.out.println("EntityService is " + service);
  m = (Menu) service.load(Menu.class, new Integer(1));
  System.out.println("Global menu constructed");
 }

}

MyComponent.jwc
--------------------------------------------------------------------
public abstract class MenuNavigation extends BaseComponent {

 @InjectState("globalMenu")
 public abstract IGlobalMenu getMenu();

 public Collection getCategories() {
  return getMenu().getCategories();
 }

}




Jean-Francois Poilpret wrote:

Hi Raul,

ObjectBuilder builder =...

Here, ... is supposed to be replaced either with:
- a call to HiveMind registry to get the hiveutils.ObjectBuilder service

- or by nothing if builder is directly injected into the class that 
has this

code.


One extra point though, as I said (maybe I was not very clear about 
that) in
my last mail, you do not need to directly call ObjectBuilder.create() 
(this

is useful only in situations where you need to pass an extra runtime
argument to your constructor, or when you need to get a new POJO instance
every time).


As I said, it seems you have a default constructor and therefore, a 
simpler
way to inject a POJO in a service through hiveutils.ObjectBuilder is 
to use

(in a transparent way) the hiveutils ObjectProvider for ObjectBuilder:
- whenever a service or configuration accepts an object (defined in the

config schema by translator="object"), then you can put the following 
into

the configuration: "object:MyPOJOName", where MyPOJOName is the name you
have set for your POJO inside the hiveutils.ObjectBuilderObjects
configuration.


This way you do not need to produce any specific code, everything is 
inside

your HiveMind config files.
The only point that you must ensure is that you actually have th

epossibility to inject an object (ie the config/service accepts the 
"object"

translator). For further info on the object translator, you should take a
look at the HiveMind web site.

Cheers

    Jean-Francois

-----Original Message-----
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Raul Raja Martinez
Sent: Monday, December 05, 2005 6:12 AM
To: [email protected]
Subject: Re: Injecting registry services to POJOS

Hi Jean-Francois
I'm gonna try the HiveUtil approach,

both in your email and in 
http://hivetranse.sourceforge.net/quickstart.html#start.objectbuilder

you refer to:

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

What is "..." supposed to be? :(

Thanks

Raul.


Jean-Francois Poilpret wrote:

Hi Raul,


From what I saw in another of your emails, I guess what you have to 
do if

you want to use HiveUtils is a config like this:

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



</object>
</contribution>

This will call the default constructor of GlobalMenu and then inject the
EntityService through the setter method.


Now the problem still remains on the Tapestry side: how to inject the 
pojo

globalMenu to the tapestry.state.ApplicationObjects configuration?

Since I do not have Tapestry on hand I cannot check what is possible 
to do
in the contributions for this configuration, but I suppose there must 
be a

way (an attribute) to inject your POJO by using "object:globalMenu".


Now for your question about a HiveMind utilities newsgroup, 
unfortunately

not (or not yet). The only way currently is to use the online forums (I

hate

that but I discovered that my provider's email server was not recognized

by

SourceForge so that any mail sent to the SF newsgroup would fail because

of

my own email address! Actually I plan to change this addres, but that is

not

done yet). Hope to create a mailing list soon.

Cheers

    Jean-Francois


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

-----Original Message-----
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Raul Raja Martinez
Sent: Sunday, December 04, 2005 12:36 PM
To: [email protected]
Subject: Re: Injecting registry services to POJOS

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,

I

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 a

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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