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Wednesday, March 27, 2013

Java :: Count the number of times a method is called

How to find how many times a method is used?

A general answer to this question would be something like this:

   public class MyClass {

     static int count = 0;

     public void myMethod() {
       count++;
     }

  }

Using static int would seem a perfect solution. Static will share the instance variable count among all instances of MyClass.

However, problem occurs in a multi threaded environment, as the count incrementation is not synchronised.


   package com.deepumohan.tech.methodinvocationcount;

   public class MyClass {

     static int count = 0;

     public void myMethod() {
       synchronized(this) {
         count++;
       }
     }
  }

Now this works perfect in a multi-threaded environment.

Java provides a better option to use thread-safe increments through Atomic classes available in java.util.concurrent.atomic packag.

   
   package com.deepumohan.tech.methodinvocationcount;

   import java.util.concurrent.atomic.AtomicInteger;

   public class MyClass {

     AtomicInteger atomicInteger = new AtomicInteger(0);

     public int getMethodInvocationCount() {
         return atomicInteger.incrementAndGet();
     }

  }

Here is a good read about AtomicInteger vs static int: Java - using AtomicInteger vs Static int

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