http://openjdk.java.net/projects/code-tools/jmh/jmh-core/: The jmh is a Java harness for building, running, and analysing nano/micro/macro benchmarks written in Java and other languages targeting the JVM. (Oracle)
  • Aleksey Shipilev (Oracle/Sun, Red Hat)
  • Sergey Kuksenko (Oracle/Sun)
  • Anders Astrand (Oracle/BEA)
  • Staffan Friberg (Oracle/BEA)
  • Henrik Loef (Oracle/BEA) 
public class org.openjdk.jmh.util.Deduplicator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.openjdk.jmh.util.Deduplicator
  super_class: java.lang.Object
{
  final java.util.concurrent.ConcurrentMap<T, T> map;
    descriptor: Ljava/util/concurrent/ConcurrentMap;
    flags: (0x0010) ACC_FINAL
    Signature: Ljava/util/concurrent/ConcurrentMap<TT;TT;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Deduplicator this
         0: .line 34
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 35
            aload 0 /* this */
            new java.util.concurrent.ConcurrentHashMap
            dup
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:()V
            putfield org.openjdk.jmh.util.Deduplicator.map:Ljava/util/concurrent/ConcurrentMap;
         2: .line 36
            return
        end local 0 // org.openjdk.jmh.util.Deduplicator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/openjdk/jmh/util/Deduplicator<TT;>;

  public T dedup();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.openjdk.jmh.util.Deduplicator this
        start local 1 // java.lang.Object t
         0: .line 39
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Deduplicator.map:Ljava/util/concurrent/ConcurrentMap;
            aload 1 /* t */
            aload 1 /* t */
            invokeinterface java.util.concurrent.ConcurrentMap.putIfAbsent:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* et */
        start local 2 // java.lang.Object et
         1: .line 40
            aload 2 /* et */
            ifnull 3
         2: .line 41
            aload 2 /* et */
            areturn
         3: .line 43
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 1 /* t */
            areturn
        end local 2 // java.lang.Object et
        end local 1 // java.lang.Object t
        end local 0 // org.openjdk.jmh.util.Deduplicator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/openjdk/jmh/util/Deduplicator<TT;>;
            0    4     1     t  TT;
            1    4     2    et  TT;
    Signature: (TT;)TT;
    MethodParameters:
      Name  Flags
      t     
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "Deduplicator.java"