Technotrance, Illusions and Perspectives

This cool tip explains 2 step logic to log all methods entry and exit information with profiling in Guice with AOP (aop-alliance)

1) Define a Guice Module with a method level logging Interceptor binding at all class levels and method levels.

public class MyModule extends AbstractModule
{     public void configure()
      {      bindInterceptor(Matchers.any(), Matchers.any(), new LoggingMethodInterceptor());
      }
}

2) Define a method level logging interceptor to log entry and exit messages with profiled information.

public class LoggingMethodInterceptor implements MethodInterceptor
{   public Object invoke(MethodInvocation invocation) throws Throwable
    {    Object returnValue = null;
    	 long start = System.currentTimeInMillis();
         System.out.println("Method "+invocation.getMethod()+" entered from "+invocation.getThis()+" with arguments "+invocation.getArguments());
         returnValue = invocation.proceed();
         long end = System.currentTimeInMillis();
         System.out.println("Method "+invocation.getMethod()+" exited in "+((end-start)/1000L)+" seconds");
         return returnValue;
    }
}

One could use this logic to extend and introduce many cross-cutting concerns such as Transaction Management, secure access to method