https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
public interface org.eclipse.collections.impl.parallel.Combiner<T> extends java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.parallel.Combiner
  super_class: java.lang.Object
{
  public void combineAll(java.lang.Iterable<T>);
    descriptor: (Ljava/lang/Iterable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.parallel.Combiner this
        start local 1 // java.lang.Iterable thingsToCombine
         0: .line 21
            aload 1 /* thingsToCombine */
            aload 0 /* this */
            invokedynamic value(Lorg/eclipse/collections/impl/parallel/Combiner;)Lorg/eclipse/collections/api/block/procedure/Procedure;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.altMetafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (Ljava/lang/Object;)V
                  org/eclipse/collections/impl/parallel/Combiner.combineOne(Ljava/lang/Object;)V (9 itf)
                  (Ljava/lang/Object;)V
                  1
            invokestatic org.eclipse.collections.impl.utility.Iterate.forEach:(Ljava/lang/Iterable;Lorg/eclipse/collections/api/block/procedure/Procedure;)V
         1: .line 22
            return
        end local 1 // java.lang.Iterable thingsToCombine
        end local 0 // org.eclipse.collections.impl.parallel.Combiner this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    2     0             this  Lorg/eclipse/collections/impl/parallel/Combiner<TT;>;
            0    2     1  thingsToCombine  Ljava/lang/Iterable<TT;>;
    Signature: (Ljava/lang/Iterable<TT;>;)V
    MethodParameters:
                 Name  Flags
      thingsToCombine  

  public abstract void combineOne();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TT;)V
    MethodParameters:
                Name  Flags
      thingToCombine  

  public abstract boolean useCombineOne();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  private static java.lang.Object $deserializeLambda$(java.lang.invoke.SerializedLambda);
    descriptor: (Ljava/lang/invoke/SerializedLambda;)Ljava/lang/Object;
    flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=4, locals=3, args_size=1
         0: .line 1
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getImplMethodName:()Ljava/lang/String;
            astore 1
            iconst_m1
            istore 2
            aload 1
            invokevirtual java.lang.String.hashCode:()I
            lookupswitch { // 1
           -159400793: 1
              default: 2
          }
      StackMap locals: java.lang.String int
      StackMap stack:
         1: aload 1
            ldc "combineOne"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 2
            iconst_0
            istore 2
      StackMap locals:
      StackMap stack:
         2: iload 2
            lookupswitch { // 1
                    0: 3
              default: 4
          }
      StackMap locals:
      StackMap stack:
         3: aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getImplMethodKind:()I
            bipush 9
            if_icmpne 4
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getFunctionalInterfaceClass:()Ljava/lang/String;
            ldc "org/eclipse/collections/api/block/procedure/Procedure"
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 4
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getFunctionalInterfaceMethodName:()Ljava/lang/String;
            ldc "value"
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 4
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getFunctionalInterfaceMethodSignature:()Ljava/lang/String;
            ldc "(Ljava/lang/Object;)V"
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 4
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getImplClass:()Ljava/lang/String;
            ldc "org/eclipse/collections/impl/parallel/Combiner"
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 4
            aload 0
            invokevirtual java.lang.invoke.SerializedLambda.getImplMethodSignature:()Ljava/lang/String;
            ldc "(Ljava/lang/Object;)V"
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 4
            aload 0
            iconst_0
            invokevirtual java.lang.invoke.SerializedLambda.getCapturedArg:(I)Ljava/lang/Object;
            checkcast org.eclipse.collections.impl.parallel.Combiner
            invokedynamic value(Lorg/eclipse/collections/impl/parallel/Combiner;)Lorg/eclipse/collections/api/block/procedure/Procedure;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.altMetafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (Ljava/lang/Object;)V
                  org/eclipse/collections/impl/parallel/Combiner.combineOne(Ljava/lang/Object;)V (9 itf)
                  (Ljava/lang/Object;)V
                  1
            areturn
      StackMap locals:
      StackMap stack:
         4: new java.lang.IllegalArgumentException
            dup
            ldc "Invalid lambda deserialization"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/io/Serializable;
SourceFile: "Combiner.java"
InnerClasses:
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles