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.Histogram implements com.codahale.metrics.Metric, com.codahale.metrics.Sampling, com.codahale.metrics.Counting
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.codahale.metrics.Histogram
  super_class: java.lang.Object
{
  private final com.codahale.metrics.Reservoir reservoir;
    descriptor: Lcom/codahale/metrics/Reservoir;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.concurrent.atomic.LongAdder count;
    descriptor: Ljava/util/concurrent/atomic/LongAdder;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(com.codahale.metrics.Reservoir);
    descriptor: (Lcom/codahale/metrics/Reservoir;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.codahale.metrics.Histogram this
        start local 1 // com.codahale.metrics.Reservoir reservoir
         0: .line 20
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 21
            aload 0 /* this */
            aload 1 /* reservoir */
            putfield com.codahale.metrics.Histogram.reservoir:Lcom/codahale/metrics/Reservoir;
         2: .line 22
            aload 0 /* this */
            new java.util.concurrent.atomic.LongAdder
            dup
            invokespecial java.util.concurrent.atomic.LongAdder.<init>:()V
            putfield com.codahale.metrics.Histogram.count:Ljava/util/concurrent/atomic/LongAdder;
         3: .line 23
            return
        end local 1 // com.codahale.metrics.Reservoir reservoir
        end local 0 // com.codahale.metrics.Histogram this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lcom/codahale/metrics/Histogram;
            0    4     1  reservoir  Lcom/codahale/metrics/Reservoir;
    MethodParameters:
           Name  Flags
      reservoir  

  public void update(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.codahale.metrics.Histogram this
        start local 1 // int value
         0: .line 31
            aload 0 /* this */
            iload 1 /* value */
            i2l
            invokevirtual com.codahale.metrics.Histogram.update:(J)V
         1: .line 32
            return
        end local 1 // int value
        end local 0 // com.codahale.metrics.Histogram this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lcom/codahale/metrics/Histogram;
            0    2     1  value  I
    MethodParameters:
       Name  Flags
      value  

  public void update(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.codahale.metrics.Histogram this
        start local 1 // long value
         0: .line 40
            aload 0 /* this */
            getfield com.codahale.metrics.Histogram.count:Ljava/util/concurrent/atomic/LongAdder;
            invokevirtual java.util.concurrent.atomic.LongAdder.increment:()V
         1: .line 41
            aload 0 /* this */
            getfield com.codahale.metrics.Histogram.reservoir:Lcom/codahale/metrics/Reservoir;
            lload 1 /* value */
            invokeinterface com.codahale.metrics.Reservoir.update:(J)V
         2: .line 42
            return
        end local 1 // long value
        end local 0 // com.codahale.metrics.Histogram this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/codahale/metrics/Histogram;
            0    3     1  value  J
    MethodParameters:
       Name  Flags
      value  

  public long getCount();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Histogram this
         0: .line 51
            aload 0 /* this */
            getfield com.codahale.metrics.Histogram.count:Ljava/util/concurrent/atomic/LongAdder;
            invokevirtual java.util.concurrent.atomic.LongAdder.sum:()J
            lreturn
        end local 0 // com.codahale.metrics.Histogram this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/codahale/metrics/Histogram;

  public com.codahale.metrics.Snapshot getSnapshot();
    descriptor: ()Lcom/codahale/metrics/Snapshot;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Histogram this
         0: .line 56
            aload 0 /* this */
            getfield com.codahale.metrics.Histogram.reservoir:Lcom/codahale/metrics/Reservoir;
            invokeinterface com.codahale.metrics.Reservoir.getSnapshot:()Lcom/codahale/metrics/Snapshot;
            areturn
        end local 0 // com.codahale.metrics.Histogram this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/codahale/metrics/Histogram;
}
SourceFile: "Histogram.java"