Answer question 1 - Java Snipplr Social Repository

Revision: 51681

at October 1, 2011 22:09 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private static Logger logger = ...;
   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }

   public void increment() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.increment();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %0 (in millis)", duration);
      }
   }

   public void decrement() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.decrement();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to decrement: %0 (in millis)", duration);
      }
   }
}

Revision: 51680

at October 1, 2011 11:02 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private static Logger logger = ...;
   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }

   public void increment() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.increment();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %1 (in millis)", duration);
      }
   }

   public void decrement() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.decrement();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to decrement: %1 (in millis)", duration);
      }
   }
}

Revision: 51679

at October 1, 2011 10:54 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }

   public void increment() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.increment();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %1 (in millis)", duration);
      }
   }

   public void decrement() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.decrement();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to decrement: %1 (in millis)", duration);
      }
   }
}

Revision: 51678

at October 1, 2011 10:54 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }

   public void increment() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.increment();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %1 (in millis)", duration);
      }
   }

   public void decrement() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.decrement();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %1 (in millis)", duration);
      }
   }
}

Revision: 51677

at October 1, 2011 10:53 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }

   public void increment() {
      long start = System.currentTimeMillis();
      try {
         incDecToTime.increment();
      } finally {
         long duration = System.currentTimeMillis() - start;
         logger.debug("Time to increment: %1 (in millis)", duration);
      }
   }

   public void decrement() {
      incDecToTime.decrement();
   }
}

Revision: 51676

at October 1, 2011 10:45 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   private final IncDec incDecToTime;

   public IncDecTimerAdapter(IncDec incDecToTime) {
      this.incDecToTime = incDecToTime;
   }
}

Revision: 51675

at October 1, 2011 10:44 by Cur3n4

Updated Code

public class IncDecTimerAdapter implements IncDec {

   public IncDecTimerAdapter(IncDec incDecToTime) {
    
   }
}

Revision: 51674

at October 1, 2011 10:41 by Cur3n4

Initial Code

public class IncDecTimerAdapter {}

Initial URL

Initial Description

The idea is to create a proxy class that will delegate the increment and decrement call to MyIncDec implementation while measuring the time. To make it as transparent as possible, the proxy extends the IncDec interface. Beacuse a dependency to the actual IncDec implementation is required, the proxy constructor requires this implementation to be passed in as a parameter.
Furthermore, the code of the increment and decrement methods will still measure the duration even if an exception is thrown.

Because time measuring (performance analysis) is a cross cutting concern in a real system I would use AOP to define the timing logic just once and apply it to any method as required.

Initial Title

Answer question 1

Initial Tags

Initial Language

Java

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