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Re: grails in sailfin converged sip servlet container
by Burt Beckwith
::
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Services don't (or at least shouldn't) have anything to do with web requests.
All you need is a hook into retrieving Spring beans. The docs suggest
registering the "consumer" as a Spring bean to enable dependency injection
but this is contrived and often impossible if Spring cannot manage the
object's lifecycle, so you could instead pull the Spring beans using a helper
class like this one:
import org.codehaus.groovy.grails.web.context.ServletContextHolder;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
public class SpringUtils {
/**
* Get a spring bean by name.
*/
@SuppressWarnings("unchecked")
public static <T> T getBean(final String name) {
ApplicationContext ctx =
(ApplicationContext)ServletContextHolder.getServletContext().getAttribute(
GrailsApplicationAttributes.APPLICATION_CONTEXT);
return (T)ctx.getBean(name);
}
}
The generics bit is a minor hack that saves you from having to cast the bean
to its type, so instead of having
MyService service = (MyService)SpringUtils.getBean("myService");
you can just have
MyService service = SpringUtils.getBean("myService");
This is entirely optional but pretty convenient.
Burt
On Tuesday 24 June 2008 11:05:12 pm Gregory Bond wrote:
> i'm trying to do something different with Grails that will be great
> for Grails and the SIP servlet community if it works out - but a few
> words describing the problem context before i get to my problem:
>
> SIP is a protocol for voice-over IP and SailFin is an open source SIP
> servlet container (https://sailfin.dev.java.net/) sponsored by Sun and
> Ericsson - the SailFin container effectively combines a SIP servlet
> container from Ericsson with Sun's open source GlassFish 2.2 HTTP
> servlet container - SailFin is called a 'converged' container because
> a deployed application (e.g. a war file) can contain *both* SIP
> servlets and HTTP servlets
>
> because SailFin includes GlassFish, i've been able to run Grails 1.0.3
> apps in the SailFin container with no problem but now i'm trying to
> "attain convergence" by packaging a SIP servlet app and a Grails app
> together in the same war file - what i want to do is have a doXXX()
> method invocation in the *SIP servlet* access my Grails app's domain
> model (either via a Grails service method or directly)
>
> what i'm trying to do appears to be a special case of Java (the SIP
> servlet doXXX method) accessing Grails (a Grails service method) but
> in this case the Grails app hasn't been invoked in response to an HTTP
> request - instead, the SIP servlet is being invoked in response to a
> SIP message - because there is no HTTP request involved in this
> scenario it doesn't appear possible to use the Spring bean approach
> described in section 8 of the Grails manual ("the service layer"
> http://grails.org/doc/1.0.x/guide/8.%20The%20Service%20Layer.html)
>
> so is there some way a service instance can be created outside of the
> context of handling an HTTP request? if not, are there any other ways
> that the Java code in the SIP servlet could access a Grails service
> method or the domain model classes packaged in the same war file?
>
> i'm thinking that there must be a solution better than the
> "stand-alone" GORM approach (http://grails.org/GORM+-+StandAlone+Gorm)
> because the SIP servlet and the Grails app are packaged in the same
> war file and therefore have access to each other's compiled code
>
> any help here would be greatly appreciated - this won't just help me -
> solving this problem would be a big contribution to the burgeoning
> telecom-over-IP community since combining Grails with SIP servlets
> would enable developers to put together converged telecom applications
> really quickly
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
---------------------------------------------------------------------
To unsubscribe from this list, please visit:
http://xircles.codehaus.org/manage_email
All you need is a hook into retrieving Spring beans. The docs suggest
registering the "consumer" as a Spring bean to enable dependency injection
but this is contrived and often impossible if Spring cannot manage the
object's lifecycle, so you could instead pull the Spring beans using a helper
class like this one:
import org.codehaus.groovy.grails.web.context.ServletContextHolder;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
public class SpringUtils {
/**
* Get a spring bean by name.
*/
@SuppressWarnings("unchecked")
public static <T> T getBean(final String name) {
ApplicationContext ctx =
(ApplicationContext)ServletContextHolder.getServletContext().getAttribute(
GrailsApplicationAttributes.APPLICATION_CONTEXT);
return (T)ctx.getBean(name);
}
}
The generics bit is a minor hack that saves you from having to cast the bean
to its type, so instead of having
MyService service = (MyService)SpringUtils.getBean("myService");
you can just have
MyService service = SpringUtils.getBean("myService");
This is entirely optional but pretty convenient.
Burt
On Tuesday 24 June 2008 11:05:12 pm Gregory Bond wrote:
> i'm trying to do something different with Grails that will be great
> for Grails and the SIP servlet community if it works out - but a few
> words describing the problem context before i get to my problem:
>
> SIP is a protocol for voice-over IP and SailFin is an open source SIP
> servlet container (https://sailfin.dev.java.net/) sponsored by Sun and
> Ericsson - the SailFin container effectively combines a SIP servlet
> container from Ericsson with Sun's open source GlassFish 2.2 HTTP
> servlet container - SailFin is called a 'converged' container because
> a deployed application (e.g. a war file) can contain *both* SIP
> servlets and HTTP servlets
>
> because SailFin includes GlassFish, i've been able to run Grails 1.0.3
> apps in the SailFin container with no problem but now i'm trying to
> "attain convergence" by packaging a SIP servlet app and a Grails app
> together in the same war file - what i want to do is have a doXXX()
> method invocation in the *SIP servlet* access my Grails app's domain
> model (either via a Grails service method or directly)
>
> what i'm trying to do appears to be a special case of Java (the SIP
> servlet doXXX method) accessing Grails (a Grails service method) but
> in this case the Grails app hasn't been invoked in response to an HTTP
> request - instead, the SIP servlet is being invoked in response to a
> SIP message - because there is no HTTP request involved in this
> scenario it doesn't appear possible to use the Spring bean approach
> described in section 8 of the Grails manual ("the service layer"
> http://grails.org/doc/1.0.x/guide/8.%20The%20Service%20Layer.html)
>
> so is there some way a service instance can be created outside of the
> context of handling an HTTP request? if not, are there any other ways
> that the Java code in the SIP servlet could access a Grails service
> method or the domain model classes packaged in the same war file?
>
> i'm thinking that there must be a solution better than the
> "stand-alone" GORM approach (http://grails.org/GORM+-+StandAlone+Gorm)
> because the SIP servlet and the Grails app are packaged in the same
> war file and therefore have access to each other's compiled code
>
> any help here would be greatly appreciated - this won't just help me -
> solving this problem would be a big contribution to the burgeoning
> telecom-over-IP community since combining Grails with SIP servlets
> would enable developers to put together converged telecom applications
> really quickly
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
---------------------------------------------------------------------
To unsubscribe from this list, please visit:
http://xircles.codehaus.org/manage_email
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