Instrumentation

• You can use  Intrumentation framework introduced in Java 5.
• Since kraken-core 1.3.4

How to Use

• Start kraken core with -javaagent option.

  java -javaagent:kraken-core-1.3.4-package.jar -jar kraken-core-1.3.4-package.jar
  

• Get IntrumentationService OSGi service using bundle context or iPOJO require configuration. (org.krakenapps.api.InstrumentationService)

  ServiceReference ref = bundleContext.getServiceReference(InstrumentationService.class.getName());
  InstrumentationService instService = bundleContext.getService(ref);
  
  .. or ..
  
  public class SampleScriptFactory implements ScriptFactory {
      @Requires 
      // you can also use <requires field="instService" /> at component declaration in iPOJO metadata.xml
      private InstrumentationService instService;
  }
  

• Use InstrumentationService object.

     // inst can be null if you did not start with javaagent option 
     // or JVM does not support instrumentation.
     Instrumentation inst = instService.getInstrumentation();
     long size = inst.getObjectSize(obj);