Re: [aspectj-users] Monitoring JBOSS

[David Garcia Garcia <garcia@xxxxxxxxx>]

Thanks I'll keep trying till I get something working.

Dave Garcia.


On Wed, Apr 09, 2003 at 10:36:04PM +0000, Mikael Andersson wrote:
> On Tuesday 08 April 2003 10.01, garcia@xxxxxxxxx wrote:
> > Hi everybody, I'm trying to monitor JBOSS's behaviour using AOP. I'm
> > interested in monitoring javax.servlet.Servlet.service(...)  and
> > org.jboss.ejb.Container.invoke(...) method's execution.
> > I got no problem monitoring servlets but got some troubles when monitoring
> > container's invokes.
> 
> JBoss does a lot of classloader trickery and i suspect that this might in some 
> way be related to you problem. System.out might be redirected to  a logfile
> or i may simply be ignored. I belive JBoss either has it's own logging api or 
> is using log4j and i recommend trying to do the logging that way.
> 
> Also JBoss builds some classes from scratch during runtime, possibly by using 
> the java proxy classes and this might also subvert the aspect binding, but I 
> don't know enough about when and how aspectj binds the aspects to the classes 
> to be able to determine if this might be the case here.
> 
> A lot of the work in JBoss is done by dynamic invocation and clever use of 
> classloaders and if you can get your aspect working outside of jboss the 
> cause is proably to be found somewhere in that area.
> 
> >
> > I created the following aspect file:
> >
> >
> > aspect container {
> > pointcut po0_execution (org.jboss.ejb.Container objo,java.lang.String
> > p0,java.lang.Object[] p1,java.lang.String[]
> > p2):target(objo)&&(execution(java.lang.Object
> > invoke(java.lang.String,java.lang.Object[],java.lang.String[])))&&args(p0,
> > p1, p2);
> >
> > before(org.jboss.ejb.Container objo,java.lang.String p0,java.lang.Object[]
> > p1,java.lang.String[] p2):po0_execution(objo,p0, p1, p2){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > Parameter 0:java.lang.String p0
> > Parameter 1:java.lang.Object[] p1
> > Parameter 2:java.lang.String[] p2
> > */
> > System.out.println("Someone is invoking me");
> > }
> > after(org.jboss.ejb.Container objo,java.lang.String p0,java.lang.Object[]
> > p1,java.lang.String[] p2):po0_execution(objo,p0, p1, p2){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > Parameter 0:java.lang.String p0
> > Parameter 1:java.lang.Object[] p1
> > Parameter 2:java.lang.String[] p2
> > */
> >
> > }
> > pointcut po1_execution (org.jboss.ejb.Container
> > objo):target(objo)&&(execution(void start()));
> >
> > before(org.jboss.ejb.Container objo):po1_execution(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> > System.out.println("start");
> > }
> > after(org.jboss.ejb.Container objo):po1_execution(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> >
> > }
> > pointcut po2_execution (org.jboss.ejb.Container
> > objo):target(objo)&&(execution(void stop()));
> >
> > before(org.jboss.ejb.Container objo):po2_execution(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> > System.out.println("stop");
> > }
> > after(org.jboss.ejb.Container objo):po2_execution(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> >
> > }
> > pointcut po3_call (org.jboss.ejb.Container objo,java.lang.String
> > p0,java.lang.Object[] p1,java.lang.String[]
> > p2):target(objo)&&(call(java.lang.Object
> > invoke(java.lang.String,java.lang.Object[],java.lang.String[])))&&args(p0,
> > p1, p2);
> >
> > before(org.jboss.ejb.Container objo,java.lang.String p0,java.lang.Object[]
> > p1,java.lang.String[] p2):po3_call(objo,p0, p1, p2){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > Parameter 0:java.lang.String p0
> > Parameter 1:java.lang.Object[] p1
> > Parameter 2:java.lang.String[] p2
> > */
> >
> > }
> > after(org.jboss.ejb.Container objo,java.lang.String p0,java.lang.Object[]
> > p1,java.lang.String[] p2):po3_call(objo,p0, p1, p2){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > Parameter 0:java.lang.String p0
> > Parameter 1:java.lang.Object[] p1
> > Parameter 2:java.lang.String[] p2
> > */
> >
> > }
> > pointcut po4_call (org.jboss.ejb.Container objo):target(objo)&&(call(void
> > start()));
> >
> > before(org.jboss.ejb.Container objo):po4_call(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> > System.out.println("call start");
> > }
> > after(org.jboss.ejb.Container objo):po4_call(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> >
> > }
> > pointcut po5_call (org.jboss.ejb.Container objo):target(objo)&&(call(void
> > stop()));
> >
> > before(org.jboss.ejb.Container objo):po5_call(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> > System.out.println("call stop");
> > }
> > after(org.jboss.ejb.Container objo):po5_call(objo){
> > /*You can acces to those objects using their name
> > Caller object :org.jboss.ejb.Container objo
> > */
> >
> > }
> > }
> >
> > But nothing is displayed in the screen :(. Does anybody has any clues about
> > what's happenning and why those message aren't displayed ?.
> >
> > Thanks everybody.
> >
> > Dave Garcia
> >
> > Politecnical University of Catalonia.
> >
> >
> /Mikael Andersson
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