Using autowiring in non grails components?

[Mirko Weber-4]

Hi all,

it is possible to use the spring autowiring of services (and other) that works in controller and services also in non grails components, for example a pogo under src/groovy? How could this work?

Thx,

mirko

[Ian Roberts]

Mirko Weber wrote:
> Hi all,
>
> it is possible to use the spring autowiring of services (and other) that
> works in controller and services also in non grails components, for
> example a pogo under src/groovy? How could this work?

To use autowiring you have to have your objects managed by Spring, i.e.
you can't just create instances of your objects using a constructor, you
have to declare them as beans in resources.groovy or resources.xml and
then either inject them into other beans or fetch them by name from the
grailsApplication.mainContext.

Given this, it's just a matter of adding the right configuration to the
bean definition in resources.groovy:

myBean(com.foo.MyBean) { bean ->
  bean.autowire = "byName"
}

or resources.xml:

<bean id="myBean" class="com.foo.MyBean" autowire="byName" />

Ian

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[hidden email]  | University of Sheffield, UK

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[Adam Evans]

Instead of using resources.xml / resources.groovy you could use the Spring annotations, Grails 1.2 supports this out the box, if using a prior version of grails just add '<component:resource-scan base-package="com.mypackage" />' to your resources.xml.

After that any class annotated with @Component is managed by Spring, you can use the @Resource(name="myService) annotation for dependency injection.

@Component
class MyNewService  {

  //Auto wire by name example
  @Resource(name="myGrailsService")
  def myGrailsService

  //Auto wire by type example
  @Autowired
  AnotherGrailsSevice anotherGrailsService

}

I prefer annotations over XML, the choice is up to you.

ianroberts wrote

Mirko Weber wrote:
> Hi all,
>
> it is possible to use the spring autowiring of services (and other) that
> works in controller and services also in non grails components, for
> example a pogo under src/groovy? How could this work?

To use autowiring you have to have your objects managed by Spring, i.e.
you can't just create instances of your objects using a constructor, you
have to declare them as beans in resources.groovy or resources.xml and
then either inject them into other beans or fetch them by name from the
grailsApplication.mainContext.

Given this, it's just a matter of adding the right configuration to the
bean definition in resources.groovy:

myBean(com.foo.MyBean) { bean ->
  bean.autowire = "byName"
}

or resources.xml:

<bean id="myBean" class="com.foo.MyBean" autowire="byName" />

Ian

--
Ian Roberts               | Department of Computer Science
[e-mail]  | University of Sheffield, UK

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[Mirko Weber-4]

Thanks for the responses. This is a good starting point for me (not much knowing about spring). I such a way I can get one instance of my pogo and autowire it.

But it is possible to get more instances from that pogo at runtime (like a domain-class) that are managed by spring and use the autowire of the services?

Thanks,

mirko

2010/1/18 AdamE <[hidden email]>

Instead of using resources.xml / resources.groovy you could use the Spring
annotations, Grails 1.2 supports this out the box, if using a prior version
of grails just add '<component:resource-scan base-package="com.mypackage"
/>' to your resources.xml.

After that any class annotated with @Component is managed by Spring, you can
use the @Resource(name="myService) annotation for dependency injection.

@Component
class MyNewService  {

 //Auto wire by name example
 @Resource(name="myGrailsService")
 def myGrailsService

 //Auto wire by type example
 @Autowired
 AnotherGrailsSevice anotherGrailsService

}

I prefer annotations over XML, the choice is up to you.

ianroberts wrote:
>
> Mirko Weber wrote:
>> Hi all,
>>
>> it is possible to use the spring autowiring of services (and other) that
>> works in controller and services also in non grails components, for
>> example a pogo under src/groovy? How could this work?
>
> To use autowiring you have to have your objects managed by Spring, i.e.
> you can't just create instances of your objects using a constructor, you
> have to declare them as beans in resources.groovy or resources.xml and
> then either inject them into other beans or fetch them by name from the
> grailsApplication.mainContext.
>
> Given this, it's just a matter of adding the right configuration to the
> bean definition in resources.groovy:
>
> myBean(com.foo.MyBean) { bean ->
>   bean.autowire = "byName"
> }
>
> or resources.xml:
>
> <bean id="myBean" class="com.foo.MyBean" autowire="byName" />
>
> Ian
>
> --
> Ian Roberts               | Department of Computer Science
> [hidden email]  | University of Sheffield, UK
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
>     http://xircles.codehaus.org/manage_email
>
>
>
>

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[Ian Roberts]

Mirko Weber wrote:
> Thanks for the responses. This is a good starting point for me (not much
> knowing about spring). I such a way I can get one instance of my pogo
> and autowire it.
>
> But it is possible to get more instances from that pogo at runtime (like
> a domain-class) that are managed by spring and use the autowire of the
> services?

Yes, set your bean to "prototype" scope rather than the default
"singleton".  Then each time you ask for it from the application context
you will get a new instance.  In resources.xml add scope="prototype" to
the <bean> element, or if you're using @Component annotations you need
to add a @Scope("prototype") annotation to the class as well (the @Scope
annotation is in org.springframework.context.annotation).

Ian

--
Ian Roberts               | Department of Computer Science
[hidden email]  | University of Sheffield, UK

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[Mirko Weber-4]

Thanks, that are the right hints. 

One little thing: I get it working with the resource.groovy style (like

beans = {

    myBean(MyBean.class){bean ->

     bean.autowire = true

bean.scope = "prototype"

}

}

)

but when I use the annotation I don't get a bean. My pogo is located under src/groovy in a package and I use such annotation:

@Component("myBean")

@Scope("prototype")

class MyBean {..}

When I boot in grails shell an run ctx.getBean("myBean") it works with the resource.groovy style but not with the annotation style. 

But this is a minor thing....at last it works, thanks to Ian+Adam.

Thx,

Mirko

2010/1/19 Ian Roberts <[hidden email]>

Mirko Weber wrote:
> Thanks for the responses. This is a good starting point for me (not much
> knowing about spring). I such a way I can get one instance of my pogo
> and autowire it.
>
> But it is possible to get more instances from that pogo at runtime (like
> a domain-class) that are managed by spring and use the autowire of the
> services?

Yes, set your bean to "prototype" scope rather than the default
"singleton".  Then each time you ask for it from the application context
you will get a new instance.  In resources.xml add scope="prototype" to
the <bean> element, or if you're using @Component annotations you need
to add a @Scope("prototype") annotation to the class as well (the @Scope
annotation is in org.springframework.context.annotation).

Ian

--
Ian Roberts               | Department of Computer Science
[hidden email]  | University of Sheffield, UK

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[Mirko Weber-4]

Ok, I also get the annotaions working, describe it http://mirkoweber.blogspot.com/2010/01/using-spring-annotation-in-pogo-inside.html

Thanks for the help,

Mirko

2010/1/19 Mirko Weber <[hidden email]>

Thanks, that are the right hints. 

One little thing: I get it working with the resource.groovy style (like

beans = {

    myBean(MyBean.class){bean ->

     bean.autowire = true

bean.scope = "prototype"

}

}

)

but when I use the annotation I don't get a bean. My pogo is located under src/groovy in a package and I use such annotation:

@Component("myBean")

@Scope("prototype")

class MyBean {..}

When I boot in grails shell an run ctx.getBean("myBean") it works with the resource.groovy style but not with the annotation style. 

But this is a minor thing....at last it works, thanks to Ian+Adam.

Thx,

Mirko

2010/1/19 Ian Roberts <[hidden email]>

Mirko Weber wrote:
> Thanks for the responses. This is a good starting point for me (not much
> knowing about spring). I such a way I can get one instance of my pogo
> and autowire it.
>
> But it is possible to get more instances from that pogo at runtime (like
> a domain-class) that are managed by spring and use the autowire of the
> services?

Yes, set your bean to "prototype" scope rather than the default
"singleton".  Then each time you ask for it from the application context
you will get a new instance.  In resources.xml add scope="prototype" to
the <bean> element, or if you're using @Component annotations you need
to add a @Scope("prototype") annotation to the class as well (the @Scope
annotation is in org.springframework.context.annotation).

Ian

--
Ian Roberts               | Department of Computer Science
[hidden email]  | University of Sheffield, UK

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[basejump (Josh)]

Its not documented anywhere but here as far as I know. It would be a good idea to update the release notes as this stung us too and has us scratching our head

 

http://old.nabble.com/@Component-annotation-in-Grails-1.2.0.RC1-td26666527.html

but you need to set 

grails.spring.bean.packages = ['com.foo.stuff','com.foo.otherstuff']

 

Then @Component will work on your myBean(you don't need to give it a name like your example below if your ok with the bean name being the same)

Then in your controller you can just do 

def myBean

and it should get injected

On Jan 19, 2010, at 5:15 PM, Mirko Weber wrote:

Ok, I also get the annotaions working, describe it http://mirkoweber.blogspot.com/2010/01/using-spring-annotation-in-pogo-inside.html

Thanks for the help,

Mirko

2010/1/19 Mirko Weber <[hidden email]>

Thanks, that are the right hints. 

One little thing: I get it working with the resource.groovy style (like

beans = {

    myBean(MyBean.class){bean ->

     bean.autowire = true

bean.scope = "prototype"

}

}

)

but when I use the annotation I don't get a bean. My pogo is located under src/groovy in a package and I use such annotation:

@Component("myBean")

@Scope("prototype")

class MyBean {..}

When I boot in grails shell an run ctx.getBean("myBean") it works with the resource.groovy style but not with the annotation style. 

But this is a minor thing....at last it works, thanks to Ian+Adam.

Thx,

Mirko

2010/1/19 Ian Roberts <[hidden email]>

Mirko Weber wrote:
> Thanks for the responses. This is a good starting point for me (not much
> knowing about spring). I such a way I can get one instance of my pogo
> and autowire it.
>
> But it is possible to get more instances from that pogo at runtime (like
> a domain-class) that are managed by spring and use the autowire of the
> services?

Yes, set your bean to "prototype" scope rather than the default
"singleton".  Then each time you ask for it from the application context
you will get a new instance.  In resources.xml add scope="prototype" to
the <bean> element, or if you're using @Component annotations you need
to add a @Scope("prototype") annotation to the class as well (the @Scope
annotation is in org.springframework.context.annotation).

Ian

--
Ian Roberts               | Department of Computer Science
[hidden email]  | University of Sheffield, UK

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