[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Lifecycle aspects revisited

[kabir.khan@jboss.com]

http://jira.jboss.com/jira/browse/JBMICROCONT-154
I should be ready to commit something later today - question is to which branch?

What we have is a new LifecycleCallbackMetaData which gets populated by the DescribeAction + AOPDependencyBuilder. It does not really use AOP much for anything other than the matching of the classes pointcuts. These lifecycle callbacks are then added to the BeanMetaData.

I've modified KernelControllerContextAction install/uninstall to look for lifecycle callback metadata and if this exists to invoke the callbacks.

It is configured as follows

  |    <aop:lifecycle-configure xmlns:aop="urn:jboss:aop-beans:1.0"
  |                name="DependencyAdvice"
  |                class="org.jboss.aop.microcontainer.aspects.jmx.JMXLifecycleCallback"
  |                classes="@org.jboss.aop.microcontainer.aspects.jmx.JMX">
  |       <property name="mbeanServer"><inject bean="MBeanServer"/></property>
  |    </aop:lifecycle-configure>
  | 

Which translates to


  |    <bean name="DependencyAdvice" class="org.jboss.aop.microcontainer.aspects.jmx.JMXLifecycleCallback">
  |       <property name="mbeanServer"><inject bean="MBeanServer"/></property>
  |    </bean>
  |    
  |    <bean name="DependencyAdvice$Binding" class="org.jboss.aop.microcontainer.beans.LifecycleBinding">
  |       <property name="callbackBean">DependencyAdvice</property>
  |       <property name="manager"><inject bean="AspectManager"/></property>
  |       <property name="classes">@org.jboss.aop.microcontainer.aspects.jmx.JMX</property>
  |       <property name="state">Configured</property>
  |    </bean>
  | 
  | 

The callbacks are no longer "interceptors", so there is no chain, and by default it will look for methods called install and uninstall. Callback methods must take the KernelControllerContext as a parameter:


  | public class JMXLifecycleCallback
  | {
  |    private MBeanServer server;
  |    
  |    public void setMbeanServer(MBeanServer server)
  |    {
  |       this.server = server;
  |    }
  |  
  |    public void install(KernelControllerContext context) throws Exception
  |    {
  |       JMX jmx = readJmxAnnotation(context);
  |       ObjectName objectName = createObjectName(context, jmx); 
  | 
  |       //register in jmx
  |    }
  |    
  |    public void uninstall(KernelControllerContext context) throws Exception
  |    {
  |       JMX jmx = readJmxAnnotation(context);
  |       ObjectName objectName = createObjectName(context, jmx); 
  | 
  |       //unregister in jmx
  |    }
  | 
  |    private JMX readJmxAnnotation(KernelControllerContext context) throws Exception
  |    {
  |       if (context.getMetaData() != null)
  |       {
  |          return context.getMetaData().getAnnotation(JMX.class);
  |       }
  |       return null;
  |    }
  |    
  |    private ObjectName createObjectName(KernelControllerContext context, JMX jmx) throws Exception
  |    {
  |       ...
  |    }
  | }
  | 


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