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.SlidingTimeWindowReservoir implements com.codahale.metrics.Reservoir
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.codahale.metrics.SlidingTimeWindowReservoir
  super_class: java.lang.Object
{
  private static final int COLLISION_BUFFER;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 256

  private static final int TRIM_THRESHOLD;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 256

  private static final long CLEAR_BUFFER;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

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

  private final java.util.concurrent.ConcurrentSkipListMap<java.lang.Long, java.lang.Long> measurements;
    descriptor: Ljava/util/concurrent/ConcurrentSkipListMap;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/concurrent/ConcurrentSkipListMap<Ljava/lang/Long;Ljava/lang/Long;>;

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

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

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

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 17
            getstatic java.util.concurrent.TimeUnit.HOURS:Ljava/util/concurrent/TimeUnit;
            lconst_1
            invokevirtual java.util.concurrent.TimeUnit.toNanos:(J)J
            ldc 256
            lmul
            putstatic com.codahale.metrics.SlidingTimeWindowReservoir.CLEAR_BUFFER:J
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(long, java.util.concurrent.TimeUnit);
    descriptor: (JLjava/util/concurrent/TimeUnit;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=3
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
        start local 1 // long window
        start local 3 // java.util.concurrent.TimeUnit windowUnit
         0: .line 32
            aload 0 /* this */
            lload 1 /* window */
            aload 3 /* windowUnit */
            invokestatic com.codahale.metrics.Clock.defaultClock:()Lcom/codahale/metrics/Clock;
            invokespecial com.codahale.metrics.SlidingTimeWindowReservoir.<init>:(JLjava/util/concurrent/TimeUnit;Lcom/codahale/metrics/Clock;)V
         1: .line 33
            return
        end local 3 // java.util.concurrent.TimeUnit windowUnit
        end local 1 // long window
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0        this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;
            0    2     1      window  J
            0    2     3  windowUnit  Ljava/util/concurrent/TimeUnit;
    MethodParameters:
            Name  Flags
      window      
      windowUnit  

  public void <init>(long, java.util.concurrent.TimeUnit, com.codahale.metrics.Clock);
    descriptor: (JLjava/util/concurrent/TimeUnit;Lcom/codahale/metrics/Clock;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=5, args_size=4
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
        start local 1 // long window
        start local 3 // java.util.concurrent.TimeUnit windowUnit
        start local 4 // com.codahale.metrics.Clock clock
         0: .line 42
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 43
            aload 0 /* this */
            aload 4 /* clock */
            putfield com.codahale.metrics.SlidingTimeWindowReservoir.clock:Lcom/codahale/metrics/Clock;
         2: .line 44
            aload 0 /* this */
            new java.util.concurrent.ConcurrentSkipListMap
            dup
            invokespecial java.util.concurrent.ConcurrentSkipListMap.<init>:()V
            putfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
         3: .line 45
            aload 0 /* this */
            aload 3 /* windowUnit */
            lload 1 /* window */
            invokevirtual java.util.concurrent.TimeUnit.toNanos:(J)J
            ldc 256
            lmul
            putfield com.codahale.metrics.SlidingTimeWindowReservoir.window:J
         4: .line 46
            aload 0 /* this */
            new java.util.concurrent.atomic.AtomicLong
            dup
            aload 4 /* clock */
            invokevirtual com.codahale.metrics.Clock.getTick:()J
            ldc 256
            lmul
            invokespecial java.util.concurrent.atomic.AtomicLong.<init>:(J)V
            putfield com.codahale.metrics.SlidingTimeWindowReservoir.lastTick:Ljava/util/concurrent/atomic/AtomicLong;
         5: .line 47
            aload 0 /* this */
            new java.util.concurrent.atomic.AtomicLong
            dup
            invokespecial java.util.concurrent.atomic.AtomicLong.<init>:()V
            putfield com.codahale.metrics.SlidingTimeWindowReservoir.count:Ljava/util/concurrent/atomic/AtomicLong;
         6: .line 48
            return
        end local 4 // com.codahale.metrics.Clock clock
        end local 3 // java.util.concurrent.TimeUnit windowUnit
        end local 1 // long window
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    7     0        this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;
            0    7     1      window  J
            0    7     3  windowUnit  Ljava/util/concurrent/TimeUnit;
            0    7     4       clock  Lcom/codahale/metrics/Clock;
    MethodParameters:
            Name  Flags
      window      
      windowUnit  
      clock       

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
         0: .line 52
            aload 0 /* this */
            invokevirtual com.codahale.metrics.SlidingTimeWindowReservoir.trim:()V
         1: .line 53
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.size:()I
            ireturn
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;

  public void update(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
        start local 1 // long value
         0: .line 58
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.count:Ljava/util/concurrent/atomic/AtomicLong;
            invokevirtual java.util.concurrent.atomic.AtomicLong.incrementAndGet:()J
            ldc 256
            lrem
            lconst_0
            lcmp
            ifne 2
         1: .line 59
            aload 0 /* this */
            invokevirtual com.codahale.metrics.SlidingTimeWindowReservoir.trim:()V
         2: .line 61
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            aload 0 /* this */
            invokevirtual com.codahale.metrics.SlidingTimeWindowReservoir.getTick:()J
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            lload 1 /* value */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         3: .line 62
            return
        end local 1 // long value
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;
            0    4     1  value  J
    MethodParameters:
       Name  Flags
      value  

  public com.codahale.metrics.Snapshot getSnapshot();
    descriptor: ()Lcom/codahale/metrics/Snapshot;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
         0: .line 66
            aload 0 /* this */
            invokevirtual com.codahale.metrics.SlidingTimeWindowReservoir.trim:()V
         1: .line 67
            new com.codahale.metrics.UniformSnapshot
            dup
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.values:()Ljava/util/Collection;
            invokespecial com.codahale.metrics.UniformSnapshot.<init>:(Ljava/util/Collection;)V
            areturn
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;

  private long getTick();
    descriptor: ()J
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=7, args_size=1
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
         0: .line 72
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.lastTick:Ljava/util/concurrent/atomic/AtomicLong;
            invokevirtual java.util.concurrent.atomic.AtomicLong.get:()J
            lstore 1 /* oldTick */
        start local 1 // long oldTick
         1: .line 73
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.clock:Lcom/codahale/metrics/Clock;
            invokevirtual com.codahale.metrics.Clock.getTick:()J
            ldc 256
            lmul
            lstore 3 /* tick */
        start local 3 // long tick
         2: .line 75
            lload 3 /* tick */
            lload 1 /* oldTick */
            lsub
            lconst_0
            lcmp
            ifle 3
            lload 3 /* tick */
            goto 4
      StackMap locals: long long
      StackMap stack:
         3: lload 1 /* oldTick */
            lconst_1
            ladd
      StackMap locals:
      StackMap stack: long
         4: lstore 5 /* newTick */
        start local 5 // long newTick
         5: .line 76
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.lastTick:Ljava/util/concurrent/atomic/AtomicLong;
            lload 1 /* oldTick */
            lload 5 /* newTick */
            invokevirtual java.util.concurrent.atomic.AtomicLong.compareAndSet:(JJ)Z
            ifeq 0
         6: .line 77
            lload 5 /* newTick */
            lreturn
        end local 5 // long newTick
        end local 3 // long tick
        end local 1 // long oldTick
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;
            1    7     1  oldTick  J
            2    7     3     tick  J
            5    7     5  newTick  J

  private void trim();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=7, args_size=1
        start local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
         0: .line 83
            aload 0 /* this */
            invokevirtual com.codahale.metrics.SlidingTimeWindowReservoir.getTick:()J
            lstore 1 /* now */
        start local 1 // long now
         1: .line 84
            lload 1 /* now */
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.window:J
            lsub
            lstore 3 /* windowStart */
        start local 3 // long windowStart
         2: .line 85
            lload 1 /* now */
            getstatic com.codahale.metrics.SlidingTimeWindowReservoir.CLEAR_BUFFER:J
            ladd
            lstore 5 /* windowEnd */
        start local 5 // long windowEnd
         3: .line 86
            lload 3 /* windowStart */
            lload 5 /* windowEnd */
            lcmp
            ifge 7
         4: .line 87
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            lload 3 /* windowStart */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.headMap:(Ljava/lang/Object;)Ljava/util/concurrent/ConcurrentNavigableMap;
            invokeinterface java.util.concurrent.ConcurrentNavigableMap.clear:()V
         5: .line 88
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            lload 5 /* windowEnd */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.tailMap:(Ljava/lang/Object;)Ljava/util/concurrent/ConcurrentNavigableMap;
            invokeinterface java.util.concurrent.ConcurrentNavigableMap.clear:()V
         6: .line 89
            goto 8
         7: .line 90
      StackMap locals: long long long
      StackMap stack:
            aload 0 /* this */
            getfield com.codahale.metrics.SlidingTimeWindowReservoir.measurements:Ljava/util/concurrent/ConcurrentSkipListMap;
            lload 5 /* windowEnd */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            lload 3 /* windowStart */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokevirtual java.util.concurrent.ConcurrentSkipListMap.subMap:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/concurrent/ConcurrentNavigableMap;
            invokeinterface java.util.concurrent.ConcurrentNavigableMap.clear:()V
         8: .line 92
      StackMap locals:
      StackMap stack:
            return
        end local 5 // long windowEnd
        end local 3 // long windowStart
        end local 1 // long now
        end local 0 // com.codahale.metrics.SlidingTimeWindowReservoir this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    9     0         this  Lcom/codahale/metrics/SlidingTimeWindowReservoir;
            1    9     1          now  J
            2    9     3  windowStart  J
            3    9     5    windowEnd  J
}
SourceFile: "SlidingTimeWindowReservoir.java"