https://github.com/reactor/reactor-core: Non-Blocking Reactive Foundation for the JVM (reactor)
  • Stephane Maldini
  • David Karnok
  • Simon Baslé
  • Sergei Egorov
  • Sébastien Deleuze 
final class reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker implements reactor.core.scheduler.Scheduler$Worker, reactor.core.scheduler.ExecutorScheduler$WorkerDelete, java.lang.Runnable, reactor.core.Scannable
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker
  super_class: java.lang.Object
{
  final java.util.concurrent.Executor executor;
    descriptor: Ljava/util/concurrent/Executor;
    flags: (0x0010) ACC_FINAL

  final java.util.Queue<reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable> queue;
    descriptor: Ljava/util/Queue;
    flags: (0x0010) ACC_FINAL
    Signature: Ljava/util/Queue<Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;>;

  volatile boolean terminated;
    descriptor: Z
    flags: (0x0040) ACC_VOLATILE

  volatile int wip;
    descriptor: I
    flags: (0x0040) ACC_VOLATILE

  static final java.util.concurrent.atomic.AtomicIntegerFieldUpdater<reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker> WIP;
    descriptor: Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    Signature: Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater<Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 297
            ldc Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
         1: .line 298
            ldc "wip"
         2: .line 297
            invokestatic java.util.concurrent.atomic.AtomicIntegerFieldUpdater.newUpdater:(Ljava/lang/Class;Ljava/lang/String;)Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater;
         3: .line 296
            putstatic reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.WIP:Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater;
         4: .line 298
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(java.util.concurrent.Executor);
    descriptor: (Ljava/util/concurrent/Executor;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
        start local 1 // java.util.concurrent.Executor executor
         0: .line 300
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 301
            aload 0 /* this */
            aload 1 /* executor */
            putfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
         2: .line 302
            aload 0 /* this */
            new java.util.concurrent.ConcurrentLinkedQueue
            dup
            invokespecial java.util.concurrent.ConcurrentLinkedQueue.<init>:()V
            putfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
         3: .line 303
            return
        end local 1 // java.util.concurrent.Executor executor
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            0    4     1  executor  Ljava/util/concurrent/Executor;
    MethodParameters:
          Name  Flags
      executor  

  public reactor.core.Disposable schedule(java.lang.Runnable);
    descriptor: (Ljava/lang/Runnable;)Lreactor/core/Disposable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
        start local 1 // java.lang.Runnable task
         0: .line 307
            aload 1 /* task */
            ldc "task"
            invokestatic java.util.Objects.requireNonNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            pop
         1: .line 308
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifeq 3
         2: .line 309
            invokestatic reactor.core.Exceptions.failWithRejected:()Ljava/util/concurrent/RejectedExecutionException;
            athrow
         3: .line 312
      StackMap locals:
      StackMap stack:
            new reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
            dup
            aload 1 /* task */
            aload 0 /* this */
            iconst_0
            invokespecial reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable.<init>:(Ljava/lang/Runnable;Lreactor/core/scheduler/ExecutorScheduler$WorkerDelete;Z)V
            astore 2 /* r */
        start local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
         4: .line 313
            aload 0 /* this */
            dup
            astore 3
            monitorenter
         5: .line 314
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifeq 7
         6: .line 315
            invokestatic reactor.core.Exceptions.failWithRejected:()Ljava/util/concurrent/RejectedExecutionException;
            athrow
         7: .line 317
      StackMap locals: reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker
      StackMap stack:
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
            aload 2 /* r */
            invokeinterface java.util.Queue.offer:(Ljava/lang/Object;)Z
            pop
         8: .line 313
            aload 3
            monitorexit
         9: goto 12
      StackMap locals:
      StackMap stack: java.lang.Throwable
        10: aload 3
            monitorexit
        11: athrow
        12: .line 320
      StackMap locals:
      StackMap stack:
            getstatic reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.WIP:Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater;
            aload 0 /* this */
            invokevirtual java.util.concurrent.atomic.AtomicIntegerFieldUpdater.getAndIncrement:(Ljava/lang/Object;)I
            ifne 19
        13: .line 322
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
            aload 0 /* this */
            invokeinterface java.util.concurrent.Executor.execute:(Ljava/lang/Runnable;)V
        14: .line 323
            goto 19
        15: .line 324
      StackMap locals:
      StackMap stack: java.lang.Throwable
            astore 3 /* ex */
        start local 3 // java.lang.Throwable ex
        16: .line 325
            aload 2 /* r */
            invokevirtual reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable.dispose:()V
        17: .line 326
            aload 3 /* ex */
            invokestatic reactor.core.scheduler.Schedulers.handleError:(Ljava/lang/Throwable;)V
        18: .line 327
            aload 3 /* ex */
            invokestatic reactor.core.Exceptions.failWithRejected:(Ljava/lang/Throwable;)Ljava/util/concurrent/RejectedExecutionException;
            athrow
        end local 3 // java.lang.Throwable ex
        19: .line 331
      StackMap locals:
      StackMap stack:
            aload 2 /* r */
            areturn
        end local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
        end local 1 // java.lang.Runnable task
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   20     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            0   20     1  task  Ljava/lang/Runnable;
            4   20     2     r  Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;
           16   19     3    ex  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           5     9      10  any
          10    11      10  any
          13    14      15  Class java.lang.Throwable
    MethodParameters:
      Name  Flags
      task  

  public void dispose();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=1
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
         0: .line 336
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifeq 2
         1: .line 337
            return
         2: .line 339
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iconst_1
            putfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
         3: .line 340
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
            astore 1 /* q */
        start local 1 // java.util.Queue q
         4: .line 344
            goto 6
        start local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
         5: .line 345
      StackMap locals: java.util.Queue reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
      StackMap stack:
            aload 2 /* r */
            invokevirtual reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable.dispose:()V
        end local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
         6: .line 344
      StackMap locals:
      StackMap stack:
            aload 1 /* q */
            invokeinterface java.util.Queue.poll:()Ljava/lang/Object;
            checkcast reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
            dup
            astore 2 /* r */
        start local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
         7: ifnull 8
            aload 1 /* q */
            invokeinterface java.util.Queue.isEmpty:()Z
            ifeq 5
         8: .line 347
      StackMap locals: reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
      StackMap stack:
            return
        end local 2 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
        end local 1 // java.util.Queue q
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            4    9     1     q  Ljava/util/Queue<Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;>;
            5    6     2     r  Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;
            7    9     2     r  Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;

  public boolean isDisposed();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
         0: .line 351
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ireturn
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;

  public void delete(reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable);
    descriptor: (Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
        start local 1 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
         0: .line 356
            aload 0 /* this */
            dup
            astore 2
            monitorenter
         1: .line 357
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifne 3
         2: .line 358
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
            aload 1 /* r */
            invokeinterface java.util.Queue.remove:(Ljava/lang/Object;)Z
            pop
         3: .line 356
      StackMap locals: reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker
      StackMap stack:
            aload 2
            monitorexit
         4: goto 7
      StackMap locals:
      StackMap stack: java.lang.Throwable
         5: aload 2
            monitorexit
         6: athrow
         7: .line 361
      StackMap locals:
      StackMap stack:
            return
        end local 1 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable r
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            0    8     1     r  Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;
      Exception table:
        from    to  target  type
           1     4       5  any
           5     6       5  any
    MethodParameters:
      Name  Flags
      r     

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=1
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
         0: .line 365
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
            astore 1 /* q */
        start local 1 // java.util.Queue q
         1: .line 369
      StackMap locals: java.util.Queue
      StackMap stack:
            iconst_0
            istore 2 /* e */
        start local 2 // int e
         2: .line 370
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.wip:I
            istore 3 /* r */
        start local 3 // int r
         3: .line 372
            goto 11
         4: .line 373
      StackMap locals: int int
      StackMap stack:
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifeq 6
         5: .line 374
            return
         6: .line 376
      StackMap locals:
      StackMap stack:
            aload 1 /* q */
            invokeinterface java.util.Queue.poll:()Ljava/lang/Object;
            checkcast reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
            astore 4 /* task */
        start local 4 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable task
         7: .line 378
            aload 4 /* task */
            ifnonnull 9
         8: .line 379
            goto 12
         9: .line 382
      StackMap locals: reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable
      StackMap stack:
            aload 4 /* task */
            invokevirtual reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable.run:()V
        10: .line 384
            iinc 2 /* e */ 1
        end local 4 // reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable task
        11: .line 372
      StackMap locals:
      StackMap stack:
            iload 2 /* e */
            iload 3 /* r */
            if_icmpne 4
        12: .line 387
      StackMap locals:
      StackMap stack:
            iload 2 /* e */
            iload 3 /* r */
            if_icmpne 14
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.terminated:Z
            ifeq 14
        13: .line 388
            return
        14: .line 391
      StackMap locals:
      StackMap stack:
            getstatic reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.WIP:Ljava/util/concurrent/atomic/AtomicIntegerFieldUpdater;
            aload 0 /* this */
            iload 2 /* e */
            ineg
            invokevirtual java.util.concurrent.atomic.AtomicIntegerFieldUpdater.addAndGet:(Ljava/lang/Object;I)I
            ifne 1
        end local 3 // int r
        end local 2 // int e
        15: .line 395
            return
        end local 1 // java.util.Queue q
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   16     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            1   16     1     q  Ljava/util/Queue<Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;>;
            2   15     2     e  I
            3   15     3     r  I
            7   11     4  task  Lreactor/core/scheduler/ExecutorScheduler$ExecutorTrackedRunnable;

  public java.lang.Object scanUnsafe(reactor.core.Scannable$Attr);
    descriptor: (Lreactor/core/Scannable$Attr;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
        start local 1 // reactor.core.Scannable$Attr key
         0: .line 399
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.TERMINATED:Lreactor/core/Scannable$Attr;
            if_acmpeq 1
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.CANCELLED:Lreactor/core/Scannable$Attr;
            if_acmpne 2
      StackMap locals:
      StackMap stack:
         1: aload 0 /* this */
            invokevirtual reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.isDisposed:()Z
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            areturn
         2: .line 400
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.PARENT:Lreactor/core/Scannable$Attr;
            if_acmpne 5
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
            instanceof reactor.core.Scannable
            ifeq 3
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
            goto 4
      StackMap locals:
      StackMap stack:
         3: aconst_null
      StackMap locals:
      StackMap stack: java.util.concurrent.Executor
         4: areturn
         5: .line 401
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.NAME:Lreactor/core/Scannable$Attr;
            if_acmpne 6
            new java.lang.StringBuilder
            dup
            ldc "fromExecutor("
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc ",trampolining).worker"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
         6: .line 402
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.BUFFERED:Lreactor/core/Scannable$Attr;
            if_acmpeq 7
            aload 1 /* key */
            getstatic reactor.core.Scannable$Attr.LARGE_BUFFERED:Lreactor/core/Scannable$Attr;
            if_acmpne 8
      StackMap locals:
      StackMap stack:
         7: aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.queue:Ljava/util/Queue;
            invokeinterface java.util.Queue.size:()I
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            areturn
         8: .line 404
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker.executor:Ljava/util/concurrent/Executor;
            aload 1 /* key */
            invokestatic reactor.core.scheduler.Schedulers.scanExecutor:(Ljava/util/concurrent/Executor;Lreactor/core/Scannable$Attr;)Ljava/lang/Object;
            areturn
        end local 1 // reactor.core.Scannable$Attr key
        end local 0 // reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lreactor/core/scheduler/ExecutorScheduler$ExecutorSchedulerTrampolineWorker;
            0    9     1   key  Lreactor/core/Scannable$Attr;
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "ExecutorScheduler.java"
NestHost: reactor.core.scheduler.ExecutorScheduler
InnerClasses:
  public Attr = reactor.core.Scannable$Attr of reactor.core.Scannable
  final ExecutorSchedulerTrampolineWorker = reactor.core.scheduler.ExecutorScheduler$ExecutorSchedulerTrampolineWorker of reactor.core.scheduler.ExecutorScheduler
  final ExecutorTrackedRunnable = reactor.core.scheduler.ExecutorScheduler$ExecutorTrackedRunnable of reactor.core.scheduler.ExecutorScheduler
  abstract WorkerDelete = reactor.core.scheduler.ExecutorScheduler$WorkerDelete of reactor.core.scheduler.ExecutorScheduler
  public abstract Worker = reactor.core.scheduler.Scheduler$Worker of reactor.core.scheduler.Scheduler