http://metrics.dropwizard.io/metrics-core: Metrics is a Java library which gives you unparalleled insight into what your code does in production. Metrics provides a powerful toolkit of ways to measure the behavior of critical components in your production environment.
  • Coda Hale
  • Ryan Tenney
  • Artem Prigoda 
public class com.codahale.metrics.Counter implements com.codahale.metrics.Metric, com.codahale.metrics.Counting
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.codahale.metrics.Counter
  super_class: java.lang.Object
{
  private final java.util.concurrent.atomic.LongAdder count;
    descriptor: Ljava/util/concurrent/atomic/LongAdder;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Counter this
         0: .line 11
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 12
            aload 0 /* this */
            new java.util.concurrent.atomic.LongAdder
            dup
            invokespecial java.util.concurrent.atomic.LongAdder.<init>:()V
            putfield com.codahale.metrics.Counter.count:Ljava/util/concurrent/atomic/LongAdder;
         2: .line 13
            return
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/codahale/metrics/Counter;

  public void inc();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Counter this
         0: .line 19
            aload 0 /* this */
            lconst_1
            invokevirtual com.codahale.metrics.Counter.inc:(J)V
         1: .line 20
            return
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/Counter;

  public void inc(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.codahale.metrics.Counter this
        start local 1 // long n
         0: .line 28
            aload 0 /* this */
            getfield com.codahale.metrics.Counter.count:Ljava/util/concurrent/atomic/LongAdder;
            lload 1 /* n */
            invokevirtual java.util.concurrent.atomic.LongAdder.add:(J)V
         1: .line 29
            return
        end local 1 // long n
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/Counter;
            0    2     1     n  J
    MethodParameters:
      Name  Flags
      n     

  public void dec();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Counter this
         0: .line 35
            aload 0 /* this */
            lconst_1
            invokevirtual com.codahale.metrics.Counter.dec:(J)V
         1: .line 36
            return
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/Counter;

  public void dec(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.codahale.metrics.Counter this
        start local 1 // long n
         0: .line 44
            aload 0 /* this */
            getfield com.codahale.metrics.Counter.count:Ljava/util/concurrent/atomic/LongAdder;
            lload 1 /* n */
            lneg
            invokevirtual java.util.concurrent.atomic.LongAdder.add:(J)V
         1: .line 45
            return
        end local 1 // long n
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/Counter;
            0    2     1     n  J
    MethodParameters:
      Name  Flags
      n     

  public long getCount();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Counter this
         0: .line 54
            aload 0 /* this */
            getfield com.codahale.metrics.Counter.count:Ljava/util/concurrent/atomic/LongAdder;
            invokevirtual java.util.concurrent.atomic.LongAdder.sum:()J
            lreturn
        end local 0 // com.codahale.metrics.Counter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/codahale/metrics/Counter;
}
SourceFile: "Counter.java"