Howdy. I'm trying to use AspectJ with Sonic ESB to intercept calls to the
service() method of any custom ESB service. That means I don't know the type
of the service class in advance; I only know that it implements interface
XQServiceEx. The implemented service() method is invoked by the Sonic
container every time a JMS message arrives at the service endpoint. However,
the container has a somewhat complex internal structure, and I'm getting three
invocations of my advice for each inbound message. (I hope my terminology
isn't too far off.)
My aspect looks like this:
package com.ncr.eai.esb.aop;
import com.sonicsw.xq.XQService;
import com.sonicsw.xq.XQServiceEx;
import com.sonicsw.xq.XQServiceContext;
import com.sonicsw.xq.XQServiceException;
import com.ncr.eai.esb.*;
aspect XQServiceAspect {
final String id = "O : ";
pointcut serviceCall(XQServiceEx svc, XQServiceContext ctx) :
call(void XQService.service(XQServiceContext)) &&
target(svc) &&
target(com.sonicsw.xq.XQService) &&
// within(com.ncr..*) &&
args(ctx);
before(com.sonicsw.xq.XQServiceEx svc, XQServiceContext ctx):
serviceCall(svc, ctx) {
System.out.println(id + "Entering XQServiceEx.service(): " +
thisJoinPointStaticPart.getSignature() + " " + svc + " " + ctx + " " + this);
}
void around(com.sonicsw.xq.XQServiceEx svc, XQServiceContext ctx):
serviceCall(svc, ctx) {
System.out.println(id + "In the around() advice before call to
XQServiceEx.service(): " + thisJoinPointStaticPart.getSignature() + " " + svc +
" " + ctx + " " + this);
proceed(svc, ctx);
System.out.println(id + "In the around() advice after call to
XQServiceEx.service(): " + thisJoinPointStaticPart.getSignature() + " " + svc +
" " + ctx + " " + this);
}
after(com.sonicsw.xq.XQServiceEx svc, XQServiceContext ctx) returning:
serviceCall(svc, ctx) {
System.out.println(id + "Returned from XQServiceEx.service(): " +
thisJoinPointStaticPart.getSignature() + " " + svc + " " + ctx + " " + this);
}
}
The output looks like this:
O : Entering XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain@c64bc2<mailto:com.sonicsw.xqimpl.service.XQServiceChain@c64bc2>
com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765<mailto:com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : In the around() advice before call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain@c64bc2<mailto:com.sonicsw.xqimpl.service.XQServiceChain@c64bc2>
com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765<mailto:com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : Entering XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : In the around() advice before call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : Entering XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.ncr.eai.esb.ServiceFromAspect@1510b03<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : In the around() advice before call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.ncr.eai.esb.ServiceFromAspect@1510b03<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
>>>> Inside of the actual service() method!
>>>> About to exit the actual service() method!
O : In the around() advice after call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.ncr.eai.esb.ServiceFromAspect@1510b03<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : Returned from XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.ncr.eai.esb.ServiceFromAspect@1510b03<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : In the around() advice after call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : Returned from XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a>
com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQServiceContextWrapper@19c705e>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : In the around() advice after call to XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain@c64bc2<mailto:com.sonicsw.xqimpl.service.XQServiceChain@c64bc2>
com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765<mailto:com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
O : Returned from XQServiceEx.service(): void
com.sonicsw.xq.XQService.service(XQServiceContext)
com.sonicsw.xqimpl.service.XQServiceChain@c64bc2<mailto:com.sonicsw.xqimpl.service.XQServiceChain@c64bc2>
com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765<mailto:com.sonicsw.xqimpl.service.XQServiceContextImpl@97e765>
com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f<mailto:com.ncr.eai.esb.aop.XQServiceAspect@d8ce8f>
I know the results of my experimentation are kind of hard to read here, but
each call to service() results in a sequence of three calls from
com.sonicsw.xqimpl.service.<mailto:com.sonicsw.xqimpl.service.XQServiceChain@c64bc2>XQServiceChain,
com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper<mailto:com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper@195638a>,
and
com.ncr.eai.esb.ServiceFromAspect<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>.
I only want to see one call per message, meaning one call to service(). And
I don't know in advance what the name of the third class will be. This test is
being run with
com.ncr.eai.esb.ServiceFromAspect<mailto:com.ncr.eai.esb.ServiceFromAspect@1510b03>,
but there may be dozens of other classes, and I don't want to have to
hard-code them; they need to be discovered. I tried to add the commented out
within(com.ncr..*)phrase, but using that prevented the pointcut from working at
all. I also tried to exclude com.sonicsw packages with things like
!within(com.sonicsw..*), but that also stopped all pointcuts from working.
As far as deployment goes, I've got this aspect jarred up, and I'm doing
load-time weaving by adding javaagent to the container command-line. The
overall strategy is working, but I have spent longer than I want to admit
trying to construct a pointcut that works as expected.
Any "advice" appreciated!
Thanks,
Lee Grey, SOA Architect
NCR
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