Re: t5: @Inject hibernate Session into a service?

2007-09-24 Thread Chris Lewis 

Angelo,

Thanks Angelo. What my service needs is an access control list stored in 
a database, but it doesn't actually need to query the database as long 
as it can be passed the list (as some kind of object). So I think what I 
need is to use @Session in my AppModule, query in my builder method, and 
then pass the list to the service (constructor injection). Would that 
seem like a sane way? I ask because I'm just getting started on 
tapestry-hibernate and am not sure if this is considered good or bad 
practice. It seems perfectly sane to me, but opinions are most welcome.


I also wanted to reiterate the concern lasitha brought up about 
injecting the Session into a service, as you mentioned. See the previous 
messages for them, but you may experience issues using it like that.


thanks for any input!

Angelo Chen wrote:

Hi Chris,

If what you want is, accessing the hibernate session from your service,
Davor has answer to my similar question before:

declare Session as parameter in you service constructor 
you dont even need to call any inject annotation ... 



MyServiceImpl(Session session){ 
  this.session=session; 
} 

in your module use: 

  public static void bind(ServiceBinder binder) 
  { 
binder.bind(MyService.class, MyServiceImpl.class); 
  } 


It works very well.
A.C.


Chris Lewis-5 wrote:
  

Hi all,

So my question is, how should I go about getting access to my database 
from my service? I'd like to use the blinding simplicity of of IoC just 
giving it to me, but I;m not sure that's an option. Any ideas?


thanks,
chris

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Re: t5: @Inject hibernate Session into a service?

2007-09-23 Thread Angelo Chen 

Hi Chris,

If what you want is, accessing the hibernate session from your service,
Davor has answer to my similar question before:

declare Session as parameter in you service constructor 
you dont even need to call any inject annotation ... 


MyServiceImpl(Session session){ 
  this.session=session; 
} 

in your module use: 

  public static void bind(ServiceBinder binder) 
  { 
binder.bind(MyService.class, MyServiceImpl.class); 
  } 

It works very well.
A.C.


Chris Lewis-5 wrote:
 
 Hi all,
 
 So my question is, how should I go about getting access to my database 
 from my service? I'd like to use the blinding simplicity of of IoC just 
 giving it to me, but I;m not sure that's an option. Any ideas?
 
 thanks,
 chris
 
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t5: @Inject hibernate Session into a service?

2007-09-22 Thread Chris Lewis 

Hi all,

I'm implementing an access control service as a Dispatcher, and 
contributing it to the MasterDispatcher service. This dispatcher runs 
just before PageRender... and ComponentAction..., so that it can check 
if the user is allowed to access the page/resource. This seems to be a 
very T5 way of doing things and completely removes the task of access 
control from the pages (ie i don't have to extend a base page that 
implements control logic).
I want this service to use a database and am already using 
tapestry-hibernate in this project. I figured I could just @Inject the 
session into my service just like I would a page or component, but that 
doesn't work. In a way that makes sense; services are singletons if I'm 
not mistaken (which makes sense), and Sessions exist (and possibly 
injected?) per-thread. Being that my service will be started in a 
different thread than any request, I think @Inject is ignored.


So my question is, how should I go about getting access to my database 
from my service? I'd like to use the blinding simplicity of of IoC just 
giving it to me, but I;m not sure that's an option. Any ideas?


thanks,
chris

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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread Chris Lewis 
I've made a bit of progress. First of all, I realized that I don't need 
database access for my AccessController (Dispatcher) since it will 
simply need to check a User object for roles, etc. This object would be 
created/destroyed by a login page. I did figure out an acceptable way to 
get at the Session at any rate, so here's what I did.


tapestry-hibernate provides the HibernateSessionManager service, which 
is represented by an interface of the same name. So in my AppModule I 
have a builder method that basically does this:


public Dispatcher buildAccessController(@Inject HibernateSessionManager 
sessionManager) {

   return new AccessControllerImpl(sessionManager);
}

The builder is provided with the tapestry-ioc HibernateSessionManager 
service, which then passes this instance to my AccessController. 
According to the source of HibernateSessionManager, the implementation 
provides a Session for the current thread via:


HibernateSessionManager#getSession

So now that my AccessController has this service, it can simply call 
getSession() anytime it needs a Session.


I'm now dealing with a different (architectural) issue, but that's for 
another message ;). I hope someone finds this useful!


sincerely,
chris

Chris Lewis wrote:

Hi all,

I'm implementing an access control service as a Dispatcher, and 
contributing it to the MasterDispatcher service. This dispatcher runs 
just before PageRender... and ComponentAction..., so that it can check 
if the user is allowed to access the page/resource. This seems to be a 
very T5 way of doing things and completely removes the task of 
access control from the pages (ie i don't have to extend a base page 
that implements control logic).
I want this service to use a database and am already using 
tapestry-hibernate in this project. I figured I could just @Inject the 
session into my service just like I would a page or component, but 
that doesn't work. In a way that makes sense; services are singletons 
if I'm not mistaken (which makes sense), and Sessions exist (and 
possibly injected?) per-thread. Being that my service will be started 
in a different thread than any request, I think @Inject is ignored.


So my question is, how should I go about getting access to my database 
from my service? I'd like to use the blinding simplicity of of IoC 
just giving it to me, but I;m not sure that's an option. Any ideas?


thanks,
chris

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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread Lococode 

why implementing an access control service ? 
^_^
maybe = a wery T5 way?


Chris Lewis-5 wrote:
 
 Hi all,
 
 I'm implementing an access control service as a Dispatcher, and 
 contributing it to the MasterDispatcher service. This dispatcher runs 
 just before PageRender... and ComponentAction..., so that it can check 
 if the user is allowed to access the page/resource. This seems to be a 
 very T5 way of doing things and completely removes the task of access 
 control from the pages (ie i don't have to extend a base page that 
 implements control logic).
 I want this service to use a database and am already using 
 tapestry-hibernate in this project. I figured I could just @Inject the 
 session into my service just like I would a page or component, but that 
 doesn't work. In a way that makes sense; services are singletons if I'm 
 not mistaken (which makes sense), and Sessions exist (and possibly 
 injected?) per-thread. Being that my service will be started in a 
 different thread than any request, I think @Inject is ignored.
 
 So my question is, how should I go about getting access to my database 
 from my service? I'd like to use the blinding simplicity of of IoC just 
 giving it to me, but I;m not sure that's an option. Any ideas?
 
 thanks,
 chris
 
 -
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]
 
 
 

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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread lasitha 
AFAIK, @Inject only works on pages and components.  Services are
injected into via their constructors, without need of any annotations.

Services are singletons by default, but you can use the @Scope
annotation to make them per-thread.

If however you want the dispatcher to be a singleton, you've got a
little more work to do :)

This recent thread about getting an ASO into a singleton service might
give you some ideas:  T5 - Inject an Application State Object into a
Service (Sep 12) [1]

In your case, you need to create something similar to the
ApplicationStateManager to get a hold of the Session for the current
thread.  Unfortunately, the HibernateSessionManager [2] service won't
work because its also per-thread.

Take a look at 'Shadow Services' [3] in the ioc.  I think you could
create a service that shadows the HibernateSessionManager.getSession()
method and have this injected into your dispatcher. Your dispatcher
and shadow service remain singletons.

I'm afraid i don't have time to test it out, but it seems to work in my head :)

Cheers,
lasitha.

[1] http://mail-archives.apache.org/mod_mbox/tapestry-users/200709.mbox/[EMAIL 
PROTECTED]

[2] 
http://tapestry.apache.org/tapestry5/tapestry-hibernate/apidocs/index.html?org/apache/tapestry/hibernate/HibernateSessionManager.html

[3] http://tapestry.apache.org/tapestry5/tapestry-ioc/shadow.html


On 9/22/07, Chris Lewis [EMAIL PROTECTED] wrote:
 Hi all,

 I'm implementing an access control service as a Dispatcher, and
 contributing it to the MasterDispatcher service. This dispatcher runs
 just before PageRender... and ComponentAction..., so that it can check
 if the user is allowed to access the page/resource. This seems to be a
 very T5 way of doing things and completely removes the task of access
 control from the pages (ie i don't have to extend a base page that
 implements control logic).
 I want this service to use a database and am already using
 tapestry-hibernate in this project. I figured I could just @Inject the
 session into my service just like I would a page or component, but that
 doesn't work. In a way that makes sense; services are singletons if I'm
 not mistaken (which makes sense), and Sessions exist (and possibly
 injected?) per-thread. Being that my service will be started in a
 different thread than any request, I think @Inject is ignored.

 So my question is, how should I go about getting access to my database
 from my service? I'd like to use the blinding simplicity of of IoC just
 giving it to me, but I;m not sure that's an option. Any ideas?

 thanks,
 chris

 -
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]



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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread lasitha 
Oh, you snuck in while i was typing :)

Please test whether your solution works - i don't think it will...

The HibernateSessionManager is a per-thread service, and the current
implementation creates a session on construction.  So your
AccessController constructor will be handed the
HibernateSessionManager (and thereby the Session) for the first thread
that accesses the AccessController.  All subsequent threads will get
the very same HibernateSessionManager and Session instances.

If i'm not getting this all muddled, i think you have to use a shadow
to get a different session per thread from your service (see my
previous post).

Cheers.

On 9/22/07, lasitha [EMAIL PROTECTED] wrote:
 AFAIK, @Inject only works on pages and components.  Services are
 injected into via their constructors, without need of any annotations.

 Services are singletons by default, but you can use the @Scope
 annotation to make them per-thread.

 If however you want the dispatcher to be a singleton, you've got a
 little more work to do :)

 This recent thread about getting an ASO into a singleton service might
 give you some ideas:  T5 - Inject an Application State Object into a
 Service (Sep 12) [1]

 In your case, you need to create something similar to the
 ApplicationStateManager to get a hold of the Session for the current
 thread.  Unfortunately, the HibernateSessionManager [2] service won't
 work because its also per-thread.

 Take a look at 'Shadow Services' [3] in the ioc.  I think you could
 create a service that shadows the HibernateSessionManager.getSession()
 method and have this injected into your dispatcher. Your dispatcher
 and shadow service remain singletons.

 I'm afraid i don't have time to test it out, but it seems to work in my head 
 :)

 Cheers,
 lasitha.

 [1] 
 http://mail-archives.apache.org/mod_mbox/tapestry-users/200709.mbox/[EMAIL 
 PROTECTED]

 [2] 
 http://tapestry.apache.org/tapestry5/tapestry-hibernate/apidocs/index.html?org/apache/tapestry/hibernate/HibernateSessionManager.html

 [3] http://tapestry.apache.org/tapestry5/tapestry-ioc/shadow.html


 On 9/22/07, Chris Lewis [EMAIL PROTECTED] wrote:
  Hi all,
 
  I'm implementing an access control service as a Dispatcher, and
  contributing it to the MasterDispatcher service. This dispatcher runs
  just before PageRender... and ComponentAction..., so that it can check
  if the user is allowed to access the page/resource. This seems to be a
  very T5 way of doing things and completely removes the task of access
  control from the pages (ie i don't have to extend a base page that
  implements control logic).
  I want this service to use a database and am already using
  tapestry-hibernate in this project. I figured I could just @Inject the
  session into my service just like I would a page or component, but that
  doesn't work. In a way that makes sense; services are singletons if I'm
  not mistaken (which makes sense), and Sessions exist (and possibly
  injected?) per-thread. Being that my service will be started in a
  different thread than any request, I think @Inject is ignored.
 
  So my question is, how should I go about getting access to my database
  from my service? I'd like to use the blinding simplicity of of IoC just
  giving it to me, but I;m not sure that's an option. Any ideas?
 
  thanks,
  chris
 
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  To unsubscribe, e-mail: [EMAIL PROTECTED]
  For additional commands, e-mail: [EMAIL PROTECTED]
 
 


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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread Chris Lewis 
Let me restate - I do NOT need the HibernateSessionManager, but I DO 
need an ASO. ASOs are per client/request/thread, so I will have to 
figure this part out as my service is a Singleton (and I'm not convinced 
it needs to be per thread). So... couldn't I just inject a reference to 
the ApplicationStateManager into my Dispatcher, and then use it to grab 
ASOs? As long as the ApplicationStateManager accesses the current 
thread, this should work. I haven't yet put much thought into this, but 
I'm reading up now. Does my logic appear flawed?


lasitha wrote:

AFAIK, @Inject only works on pages and components.  Services are
injected into via their constructors, without need of any annotations.

Services are singletons by default, but you can use the @Scope
annotation to make them per-thread.

If however you want the dispatcher to be a singleton, you've got a
little more work to do :)

This recent thread about getting an ASO into a singleton service might
give you some ideas:  T5 - Inject an Application State Object into a
Service (Sep 12) [1]

In your case, you need to create something similar to the
ApplicationStateManager to get a hold of the Session for the current
thread.  Unfortunately, the HibernateSessionManager [2] service won't
work because its also per-thread.

Take a look at 'Shadow Services' [3] in the ioc.  I think you could
create a service that shadows the HibernateSessionManager.getSession()
method and have this injected into your dispatcher. Your dispatcher
and shadow service remain singletons.

I'm afraid i don't have time to test it out, but it seems to work in my head :)

Cheers,
lasitha.

[1] http://mail-archives.apache.org/mod_mbox/tapestry-users/200709.mbox/[EMAIL 
PROTECTED]

[2] 
http://tapestry.apache.org/tapestry5/tapestry-hibernate/apidocs/index.html?org/apache/tapestry/hibernate/HibernateSessionManager.html

[3] http://tapestry.apache.org/tapestry5/tapestry-ioc/shadow.html


On 9/22/07, Chris Lewis [EMAIL PROTECTED] wrote:
  

Hi all,

I'm implementing an access control service as a Dispatcher, and
contributing it to the MasterDispatcher service. This dispatcher runs
just before PageRender... and ComponentAction..., so that it can check
if the user is allowed to access the page/resource. This seems to be a
very T5 way of doing things and completely removes the task of access
control from the pages (ie i don't have to extend a base page that
implements control logic).
I want this service to use a database and am already using
tapestry-hibernate in this project. I figured I could just @Inject the
session into my service just like I would a page or component, but that
doesn't work. In a way that makes sense; services are singletons if I'm
not mistaken (which makes sense), and Sessions exist (and possibly
injected?) per-thread. Being that my service will be started in a
different thread than any request, I think @Inject is ignored.

So my question is, how should I go about getting access to my database
from my service? I'd like to use the blinding simplicity of of IoC just
giving it to me, but I;m not sure that's an option. Any ideas?

thanks,
chris

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To unsubscribe, e-mail: [EMAIL PROTECTED]
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Re: t5: @Inject hibernate Session into a service?

2007-09-22 Thread lasitha 
Your logic is fine with regard to the ApplicationStateManager.

I wanted to mention the difference with the HibernateSessionManager
for the sake of anyone else that happens upon this thread.

All the best,
lasitha.

On 9/23/07, Chris Lewis [EMAIL PROTECTED] wrote:
 Let me restate - I do NOT need the HibernateSessionManager, but I DO
 need an ASO. ASOs are per client/request/thread, so I will have to
 figure this part out as my service is a Singleton (and I'm not convinced
 it needs to be per thread). So... couldn't I just inject a reference to
 the ApplicationStateManager into my Dispatcher, and then use it to grab
 ASOs? As long as the ApplicationStateManager accesses the current
 thread, this should work. I haven't yet put much thought into this, but
 I'm reading up now. Does my logic appear flawed?

 lasitha wrote:
  AFAIK, @Inject only works on pages and components.  Services are
  injected into via their constructors, without need of any annotations.
 
  Services are singletons by default, but you can use the @Scope
  annotation to make them per-thread.
 
  If however you want the dispatcher to be a singleton, you've got a
  little more work to do :)
 
  This recent thread about getting an ASO into a singleton service might
  give you some ideas:  T5 - Inject an Application State Object into a
  Service (Sep 12) [1]
 
  In your case, you need to create something similar to the
  ApplicationStateManager to get a hold of the Session for the current
  thread.  Unfortunately, the HibernateSessionManager [2] service won't
  work because its also per-thread.
 
  Take a look at 'Shadow Services' [3] in the ioc.  I think you could
  create a service that shadows the HibernateSessionManager.getSession()
  method and have this injected into your dispatcher. Your dispatcher
  and shadow service remain singletons.
 
  I'm afraid i don't have time to test it out, but it seems to work in my 
  head :)
 
  Cheers,
  lasitha.
 
  [1] 
  http://mail-archives.apache.org/mod_mbox/tapestry-users/200709.mbox/[EMAIL 
  PROTECTED]
 
  [2] 
  http://tapestry.apache.org/tapestry5/tapestry-hibernate/apidocs/index.html?org/apache/tapestry/hibernate/HibernateSessionManager.html
 
  [3] http://tapestry.apache.org/tapestry5/tapestry-ioc/shadow.html
 
 
  On 9/22/07, Chris Lewis [EMAIL PROTECTED] wrote:
 
  Hi all,
 
  I'm implementing an access control service as a Dispatcher, and
  contributing it to the MasterDispatcher service. This dispatcher runs
  just before PageRender... and ComponentAction..., so that it can check
  if the user is allowed to access the page/resource. This seems to be a
  very T5 way of doing things and completely removes the task of access
  control from the pages (ie i don't have to extend a base page that
  implements control logic).
  I want this service to use a database and am already using
  tapestry-hibernate in this project. I figured I could just @Inject the
  session into my service just like I would a page or component, but that
  doesn't work. In a way that makes sense; services are singletons if I'm
  not mistaken (which makes sense), and Sessions exist (and possibly
  injected?) per-thread. Being that my service will be started in a
  different thread than any request, I think @Inject is ignored.
 
  So my question is, how should I go about getting access to my database
  from my service? I'd like to use the blinding simplicity of of IoC just
  giving it to me, but I;m not sure that's an option. Any ideas?
 
  thanks,
  chris
 
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  To unsubscribe, e-mail: [EMAIL PROTECTED]
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