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.Timer$Context implements java.lang.AutoCloseable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.codahale.metrics.Timer$Context
  super_class: java.lang.Object
{
  private final com.codahale.metrics.Timer timer;
    descriptor: Lcom/codahale/metrics/Timer;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final com.codahale.metrics.Clock clock;
    descriptor: Lcom/codahale/metrics/Clock;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final long startTime;
    descriptor: J
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private void <init>(com.codahale.metrics.Timer, com.codahale.metrics.Clock);
    descriptor: (Lcom/codahale/metrics/Timer;Lcom/codahale/metrics/Clock;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.codahale.metrics.Timer$Context this
        start local 1 // com.codahale.metrics.Timer timer
        start local 2 // com.codahale.metrics.Clock clock
         0: .line 23
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 24
            aload 0 /* this */
            aload 1 /* timer */
            putfield com.codahale.metrics.Timer$Context.timer:Lcom/codahale/metrics/Timer;
         2: .line 25
            aload 0 /* this */
            aload 2 /* clock */
            putfield com.codahale.metrics.Timer$Context.clock:Lcom/codahale/metrics/Clock;
         3: .line 26
            aload 0 /* this */
            aload 2 /* clock */
            invokevirtual com.codahale.metrics.Clock.getTick:()J
            putfield com.codahale.metrics.Timer$Context.startTime:J
         4: .line 27
            return
        end local 2 // com.codahale.metrics.Clock clock
        end local 1 // com.codahale.metrics.Timer timer
        end local 0 // com.codahale.metrics.Timer$Context this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    5     0   this  Lcom/codahale/metrics/Timer$Context;
            0    5     1  timer  Lcom/codahale/metrics/Timer;
            0    5     2  clock  Lcom/codahale/metrics/Clock;
    MethodParameters:
       Name  Flags
      timer  
      clock  

  public long stop();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=1
        start local 0 // com.codahale.metrics.Timer$Context this
         0: .line 36
            aload 0 /* this */
            getfield com.codahale.metrics.Timer$Context.clock:Lcom/codahale/metrics/Clock;
            invokevirtual com.codahale.metrics.Clock.getTick:()J
            aload 0 /* this */
            getfield com.codahale.metrics.Timer$Context.startTime:J
            lsub
            lstore 1 /* elapsed */
        start local 1 // long elapsed
         1: .line 37
            aload 0 /* this */
            getfield com.codahale.metrics.Timer$Context.timer:Lcom/codahale/metrics/Timer;
            lload 1 /* elapsed */
            getstatic java.util.concurrent.TimeUnit.NANOSECONDS:Ljava/util/concurrent/TimeUnit;
            invokevirtual com.codahale.metrics.Timer.update:(JLjava/util/concurrent/TimeUnit;)V
         2: .line 38
            lload 1 /* elapsed */
            lreturn
        end local 1 // long elapsed
        end local 0 // com.codahale.metrics.Timer$Context this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/codahale/metrics/Timer$Context;
            1    3     1  elapsed  J

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.codahale.metrics.Timer$Context this
         0: .line 46
            aload 0 /* this */
            invokevirtual com.codahale.metrics.Timer$Context.stop:()J
            pop2
         1: .line 47
            return
        end local 0 // com.codahale.metrics.Timer$Context this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/Timer$Context;
}
SourceFile: "Timer.java"
NestHost: com.codahale.metrics.Timer
InnerClasses:
  public Context = com.codahale.metrics.Timer$Context of com.codahale.metrics.Timer