Class BCELMBeanInvoker

MBeanInvoker that generates on-the-fly implementations to call standard MBeans directly, instead of using reflection.
It uses the BCEL to generate the required bytecode on-the-fly. The generated class is named "mx4j.server.BCELMBeanInvokerGenerated", and it's loaded into the JVM by a different classloader for each MBean. This classloader has the MBean classloader as parent.
Below is an example of the generated code; beware that the management interface and all parameter's classes must be public, otherwise an IllegalAccessError is thrown and the invocation falls back to use reflection (but with a significant overhead - throwing an exception is expensive).

 public interface ServiceMBean
 {
    public void start();
    public Collection getServices(ServiceSelector selector);
 }
 

 public class BCELMBeanInvokerGenerated extends BCELMBeanInvoker
 {
    protected Object invokeImpl(MBeanMetaData metadata, String method, String[] signature, Object[] args)
          throws Throwable
    {
       if (method.equals("start") && args.length == 0)
       {
          try
          {
             ((ServiceMBean)metadata.mbean).start();
             return null;
          }
          catch (ClassCastException x) {}
          catch (IllegalAccessError x) {}
       }
       else if (method.equals("getServices") && args.length == 1)
       {
          try
          {
             return ((ServiceMBean)metadata.mbean).getServices((ServiceSelector)args[0]);
          }
          catch (ClassCastException x) {}
          catch (IllegalAccessError x) {}
       }
       return super.invokeImpl(metadata, method, signature, args);
    }
 }
 

Version: $Revision: 1.14 $