https://cassandra.apache.org: The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
  • Andres de la Peña
  • Avinash Lakshman
  • Aleksey Yeschenko
  • Aaron Morton
  • Ariel Weisberg
  • Blake Eggleston
  • Benedict Elliott Smith
  • Benjamin Lerer
  • Branimir Lambov
  • Brandon Williams
  • Carl Yeksigian
  • David Brosiusd
  • Dikang Gu
  • Eric Evans
  • Gary Dusbabek
  • Chris Goffinet
  • Alex Petrov
  • Laine Jaakko Olavi
  • T Jake Luciani
  • Jason Brown
  • Jonathan Ellis
  • Jake Farrell
  • Jeff Jirsa
  • Joel Knighton
  • Josh McKenzie
  • Johan Oskarsson
  • Jun Rao
  • Jay Zhuang
  • Sankalp Kohli
  • Marcus Eriksson
  • Michael Semb Wever
  • Mikhail Stepura
  • Michael Shuler
  • Paulo Motta
  • Prashant Malik
  • Robert Stupp
  • Peter Schuller
  • Sam Tunnicliffe
  • Sylvain Lebresne
  • Stefania Alborghetti
  • Tyler Hobbs
  • Vijay Parthasarathy
  • Pavel Yaskevich
  • Yuki Morishita
  • Nate McCall 
public class org.apache.cassandra.utils.TopKSampler<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.cassandra.utils.TopKSampler
  super_class: java.lang.Object
{
  private static final org.slf4j.Logger logger;
    descriptor: Lorg/slf4j/Logger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private volatile boolean enabled;
    descriptor: Z
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE

  static final java.util.concurrent.ThreadPoolExecutor samplerExecutor;
    descriptor: Ljava/util/concurrent/ThreadPoolExecutor;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.VisibleForTesting()

  private com.clearspring.analytics.stream.StreamSummary<T> summary;
    descriptor: Lcom/clearspring/analytics/stream/StreamSummary;
    flags: (0x0002) ACC_PRIVATE
    Signature: Lcom/clearspring/analytics/stream/StreamSummary<TT;>;

  com.clearspring.analytics.stream.cardinality.HyperLogLogPlus hll;
    descriptor: Lcom/clearspring/analytics/stream/cardinality/HyperLogLogPlus;
    flags: (0x0000) 
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.VisibleForTesting()

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=10, locals=0, args_size=0
         0: .line 33
            ldc Lorg/apache/cassandra/utils/TopKSampler;
            invokestatic org.slf4j.LoggerFactory.getLogger:(Ljava/lang/Class;)Lorg/slf4j/Logger;
            putstatic org.apache.cassandra.utils.TopKSampler.logger:Lorg/slf4j/Logger;
         1: .line 37
            new org.apache.cassandra.concurrent.JMXEnabledThreadPoolExecutor
            dup
            iconst_1
            lconst_1
         2: .line 38
            getstatic java.util.concurrent.TimeUnit.SECONDS:Ljava/util/concurrent/TimeUnit;
         3: .line 39
            new java.util.concurrent.LinkedBlockingQueue
            dup
            invokespecial java.util.concurrent.LinkedBlockingQueue.<init>:()V
         4: .line 40
            new org.apache.cassandra.concurrent.NamedThreadFactory
            dup
            ldc "Sampler"
            invokespecial org.apache.cassandra.concurrent.NamedThreadFactory.<init>:(Ljava/lang/String;)V
         5: .line 41
            ldc "internal"
         6: .line 37
            invokespecial org.apache.cassandra.concurrent.JMXEnabledThreadPoolExecutor.<init>:(IJLjava/util/concurrent/TimeUnit;Ljava/util/concurrent/BlockingQueue;Lorg/apache/cassandra/concurrent/NamedThreadFactory;Ljava/lang/String;)V
            putstatic org.apache.cassandra.utils.TopKSampler.samplerExecutor:Ljava/util/concurrent/ThreadPoolExecutor;
         7: .line 41
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.cassandra.utils.TopKSampler this
         0: .line 31
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 34
            aload 0 /* this */
            iconst_0
            putfield org.apache.cassandra.utils.TopKSampler.enabled:Z
         2: .line 31
            return
        end local 0 // org.apache.cassandra.utils.TopKSampler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/cassandra/utils/TopKSampler<TT;>;

  public synchronized void beginSampling(int);
    descriptor: (I)V
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // org.apache.cassandra.utils.TopKSampler this
        start local 1 // int capacity
         0: .line 57
            aload 0 /* this */
            getfield org.apache.cassandra.utils.TopKSampler.enabled:Z
            ifne 4
         1: .line 59
            aload 0 /* this */
            new com.clearspring.analytics.stream.StreamSummary
            dup
            iload 1 /* capacity */
            invokespecial com.clearspring.analytics.stream.StreamSummary.<init>:(I)V
            putfield org.apache.cassandra.utils.TopKSampler.summary:Lcom/clearspring/analytics/stream/StreamSummary;
         2: .line 60
            aload 0 /* this */
            new com.clearspring.analytics.stream.cardinality.HyperLogLogPlus
            dup
            bipush 14
            invokespecial com.clearspring.analytics.stream.cardinality.HyperLogLogPlus.<init>:(I)V
            putfield org.apache.cassandra.utils.TopKSampler.hll:Lcom/clearspring/analytics/stream/cardinality/HyperLogLogPlus;
         3: .line 61
            aload 0 /* this */
            iconst_1
            putfield org.apache.cassandra.utils.TopKSampler.enabled:Z
         4: .line 63
      StackMap locals:
      StackMap stack:
            return
        end local 1 // int capacity
        end local 0 // org.apache.cassandra.utils.TopKSampler this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lorg/apache/cassandra/utils/TopKSampler<TT;>;
            0    5     1  capacity  I
    MethodParameters:
          Name  Flags
      capacity  

  public synchronized org.apache.cassandra.utils.TopKSampler$SamplerResult<T> finishSampling(int);
    descriptor: (I)Lorg/apache/cassandra/utils/TopKSampler$SamplerResult;
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=5, locals=5, args_size=2
        start local 0 // org.apache.cassandra.utils.TopKSampler this
        start local 1 // int count
         0: .line 71
            getstatic java.util.Collections.EMPTY_LIST:Ljava/util/List;
            astore 2 /* results */
        start local 2 // java.util.List results
         1: .line 72
            lconst_0
            lstore 3 /* cardinality */
        start local 3 // long cardinality
         2: .line 73
            aload 0 /* this */
            getfield org.apache.cassandra.utils.TopKSampler.enabled:Z
            ifeq 6
         3: .line 75
            aload 0 /* this */
            iconst_0
            putfield org.apache.cassandra.utils.TopKSampler.enabled:Z
         4: .line 76
            aload 0 /* this */
            getfield org.apache.cassandra.utils.TopKSampler.summary:Lcom/clearspring/analytics/stream/StreamSummary;
            iload 1 /* count */
            invokevirtual com.clearspring.analytics.stream.StreamSummary.topK:(I)Ljava/util/List;
            astore 2 /* results */
         5: .line 77
            aload 0 /* this */
            getfield org.apache.cassandra.utils.TopKSampler.hll:Lcom/clearspring/analytics/stream/cardinality/HyperLogLogPlus;
            invokevirtual com.clearspring.analytics.stream.cardinality.HyperLogLogPlus.cardinality:()J
            lstore 3 /* cardinality */
         6: .line 79
      StackMap locals: java.util.List long
      StackMap stack:
            new org.apache.cassandra.utils.TopKSampler$SamplerResult
            dup
            aload 2 /* results */
            lload 3 /* cardinality */
            invokespecial org.apache.cassandra.utils.TopKSampler$SamplerResult.<init>:(Ljava/util/List;J)V
            areturn
        end local 3 // long cardinality
        end local 2 // java.util.List results
        end local 1 // int count
        end local 0 // org.apache.cassandra.utils.TopKSampler this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    7     0         this  Lorg/apache/cassandra/utils/TopKSampler<TT;>;
            0    7     1        count  I
            1    7     2      results  Ljava/util/List<Lcom/clearspring/analytics/stream/Counter<TT;>;>;
            2    7     3  cardinality  J
    Signature: (I)Lorg/apache/cassandra/utils/TopKSampler$SamplerResult<TT;>;
    MethodParameters:
       Name  Flags
      count  

  public void addSample();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // org.apache.cassandra.utils.TopKSampler this
        start local 1 // java.lang.Object item
         0: .line 84
            aload 0 /* this */
            aload 1 /* item */
            aload 1 /* item */
            invokevirtual java.lang.Object.hashCode:()I
            i2l
            iconst_1
            invokevirtual org.apache.cassandra.utils.TopKSampler.addSample:(Ljava/lang/Object;JI)V
         1: .line 85
            return
        end local 1 // java.lang.Object item
        end local 0 // org.apache.cassandra.utils.TopKSampler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/cassandra/utils/TopKSampler<TT;>;
            0    2     1  item  TT;
    Signature: (TT;)V
    MethodParameters:
      Name  Flags
      item  

  public void addSample(T, long, );
    descriptor: (Ljava/lang/Object;JI)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=9, locals=6, args_size=4
        start local 0 // org.apache.cassandra.utils.TopKSampler this
        start local 1 // java.lang.Object item
        start local 2 // long hash
        start local 4 // int value
         0: .line 94
            aload 0 /* this */
            getfield org.apache.cassandra.utils.TopKSampler.enabled:Z
            ifeq 3
         1: .line 96
            aload 0 /* this */
            astore 5 /* lock */
        start local 5 // java.lang.Object lock
         2: .line 97
            getstatic org.apache.cassandra.utils.TopKSampler.samplerExecutor:Ljava/util/concurrent/ThreadPoolExecutor;
            new org.apache.cassandra.utils.TopKSampler$1
            dup
            aload 0 /* this */
            aload 5 /* lock */
            aload 1 /* item */
            iload 4 /* value */
            lload 2 /* hash */
            invokespecial org.apache.cassandra.utils.TopKSampler$1.<init>:(Lorg/apache/cassandra/utils/TopKSampler;Ljava/lang/Object;Ljava/lang/Object;IJ)V
            invokevirtual java.util.concurrent.ThreadPoolExecutor.execute:(Ljava/lang/Runnable;)V
        end local 5 // java.lang.Object lock
         3: .line 120
      StackMap locals:
      StackMap stack:
            return
        end local 4 // int value
        end local 2 // long hash
        end local 1 // java.lang.Object item
        end local 0 // org.apache.cassandra.utils.TopKSampler this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lorg/apache/cassandra/utils/TopKSampler<TT;>;
            0    4     1   item  TT;
            0    4     2   hash  J
            0    4     4  value  I
            2    3     5   lock  Ljava/lang/Object;
    Signature: (TT;JI)V
    MethodParameters:
       Name  Flags
      item   final
      hash   final
      value  final
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "TopKSampler.java"
NestMembers:
  org.apache.cassandra.utils.TopKSampler$1  org.apache.cassandra.utils.TopKSampler$SamplerResult
InnerClasses:
  org.apache.cassandra.utils.TopKSampler$1
  public SamplerResult = org.apache.cassandra.utils.TopKSampler$SamplerResult of org.apache.cassandra.utils.TopKSampler