class java.lang.ApplicationShutdownHooks implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: java.lang.ApplicationShutdownHooks
  super_class: java.lang.Object
{
  private static java.lang.ApplicationShutdownHooks instance;
    descriptor: Ljava/lang/ApplicationShutdownHooks;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC

  private static java.util.IdentityHashMap<java.lang.Thread, java.lang.Thread> hooks;
    descriptor: Ljava/util/IdentityHashMap;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Signature: Ljava/util/IdentityHashMap<Ljava/lang/Thread;Ljava/lang/Thread;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 38
            aconst_null
            putstatic java.lang.ApplicationShutdownHooks.instance:Ljava/lang/ApplicationShutdownHooks;
         1: .line 41
            new java.util.IdentityHashMap
            dup
            invokespecial java.util.IdentityHashMap.<init>:()V
            putstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  static synchronized java.lang.ApplicationShutdownHooks hook();
    descriptor: ()Ljava/lang/ApplicationShutdownHooks;
    flags: (0x0028) ACC_STATIC, ACC_SYNCHRONIZED
    Code:
      stack=2, locals=0, args_size=0
         0: .line 44
            getstatic java.lang.ApplicationShutdownHooks.instance:Ljava/lang/ApplicationShutdownHooks;
            ifnonnull 2
         1: .line 45
            new java.lang.ApplicationShutdownHooks
            dup
            invokespecial java.lang.ApplicationShutdownHooks.<init>:()V
            putstatic java.lang.ApplicationShutdownHooks.instance:Ljava/lang/ApplicationShutdownHooks;
         2: .line 47
      StackMap locals:
      StackMap stack:
            getstatic java.lang.ApplicationShutdownHooks.instance:Ljava/lang/ApplicationShutdownHooks;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.ApplicationShutdownHooks this
         0: .line 50
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // java.lang.ApplicationShutdownHooks this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljava/lang/ApplicationShutdownHooks;

  static synchronized void add(java.lang.Thread);
    descriptor: (Ljava/lang/Thread;)V
    flags: (0x0028) ACC_STATIC, ACC_SYNCHRONIZED
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Thread hook
         0: .line 56
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            ifnonnull 2
         1: .line 57
            new java.lang.IllegalStateException
            dup
            ldc "Shutdown in progress"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 59
      StackMap locals:
      StackMap stack:
            aload 0 /* hook */
            invokevirtual java.lang.Thread.isAlive:()Z
            ifeq 4
         3: .line 60
            new java.lang.IllegalArgumentException
            dup
            ldc "Hook already running"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 62
      StackMap locals:
      StackMap stack:
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            aload 0 /* hook */
            invokevirtual java.util.IdentityHashMap.containsKey:(Ljava/lang/Object;)Z
            ifeq 6
         5: .line 63
            new java.lang.IllegalArgumentException
            dup
            ldc "Hook previously registered"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 65
      StackMap locals:
      StackMap stack:
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            aload 0 /* hook */
            aload 0 /* hook */
            invokevirtual java.util.IdentityHashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         7: .line 66
            return
        end local 0 // java.lang.Thread hook
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  hook  Ljava/lang/Thread;
    MethodParameters:
      Name  Flags
      hook  

  static synchronized boolean remove(java.lang.Thread);
    descriptor: (Ljava/lang/Thread;)Z
    flags: (0x0028) ACC_STATIC, ACC_SYNCHRONIZED
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Thread hook
         0: .line 72
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            ifnonnull 2
         1: .line 73
            new java.lang.IllegalStateException
            dup
            ldc "Shutdown in progress"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 75
      StackMap locals:
      StackMap stack:
            aload 0 /* hook */
            ifnonnull 4
         3: .line 76
            new java.lang.NullPointerException
            dup
            invokespecial java.lang.NullPointerException.<init>:()V
            athrow
         4: .line 78
      StackMap locals:
      StackMap stack:
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            aload 0 /* hook */
            invokevirtual java.util.IdentityHashMap.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            ifnull 5
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         5: iconst_0
            ireturn
        end local 0 // java.lang.Thread hook
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  hook  Ljava/lang/Thread;
    MethodParameters:
      Name  Flags
      hook  

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=1
        start local 0 // java.lang.ApplicationShutdownHooks this
         0: .line 87
            ldc Ljava/lang/ApplicationShutdownHooks;
            dup
            astore 2
            monitorenter
         1: .line 88
            getstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
            invokevirtual java.util.IdentityHashMap.keySet:()Ljava/util/Set;
            astore 1 /* threads */
        start local 1 // java.util.Collection threads
         2: .line 89
            aconst_null
            putstatic java.lang.ApplicationShutdownHooks.hooks:Ljava/util/IdentityHashMap;
         3: .line 87
            aload 2
            monitorexit
         4: goto 7
        end local 1 // java.util.Collection threads
      StackMap locals: java.lang.ApplicationShutdownHooks top java.lang.Class
      StackMap stack: java.lang.Throwable
         5: aload 2
            monitorexit
         6: athrow
        start local 1 // java.util.Collection threads
         7: .line 92
      StackMap locals: java.lang.ApplicationShutdownHooks java.util.Collection
      StackMap stack:
            aload 1 /* threads */
            invokeinterface java.util.Collection.iterator:()Ljava/util/Iterator;
            astore 3
            goto 10
      StackMap locals: java.lang.ApplicationShutdownHooks java.util.Collection top java.util.Iterator
      StackMap stack:
         8: aload 3
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Thread
            astore 2 /* hook */
        start local 2 // java.lang.Thread hook
         9: .line 93
            aload 2 /* hook */
            invokevirtual java.lang.Thread.start:()V
        end local 2 // java.lang.Thread hook
        10: .line 92
      StackMap locals:
      StackMap stack:
            aload 3
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 8
        11: .line 95
            aload 1 /* threads */
            invokeinterface java.util.Collection.iterator:()Ljava/util/Iterator;
            astore 3
            goto 16
      StackMap locals:
      StackMap stack:
        12: aload 3
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Thread
            astore 2 /* hook */
        start local 2 // java.lang.Thread hook
        13: .line 97
            aload 2 /* hook */
            invokevirtual java.lang.Thread.join:()V
        14: .line 98
            goto 16
      StackMap locals: java.lang.ApplicationShutdownHooks java.util.Collection java.lang.Thread java.util.Iterator
      StackMap stack: java.lang.InterruptedException
        15: pop
        end local 2 // java.lang.Thread hook
        16: .line 95
      StackMap locals: java.lang.ApplicationShutdownHooks java.util.Collection top java.util.Iterator
      StackMap stack:
            aload 3
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 12
        17: .line 100
            return
        end local 1 // java.util.Collection threads
        end local 0 // java.lang.ApplicationShutdownHooks this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   18     0     this  Ljava/lang/ApplicationShutdownHooks;
            2    5     1  threads  Ljava/util/Collection<Ljava/lang/Thread;>;
            7   18     1  threads  Ljava/util/Collection<Ljava/lang/Thread;>;
            9   10     2     hook  Ljava/lang/Thread;
           13   16     2     hook  Ljava/lang/Thread;
      Exception table:
        from    to  target  type
           1     4       5  any
           5     6       5  any
          13    14      15  Class java.lang.InterruptedException
}
SourceFile: "ApplicationShutdownHooks.java"