https://logging.apache.org/log4j/2.x/log4j-core/: The Apache Log4j Implementation (The Apache Software Foundation)
  • Ralph Goers (Nextiva)
  • Gary Gregory (Rocket Software)
  • Scott Deboy
  • Remko Popma
  • Nick Williams
  • Matt Sicker (CloudBees)
  • Bruce Brouwer
  • Mikael Ståldal (Spotify)
  • Carter Kozak 
public final class org.apache.logging.log4j.core.util.ClockFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.logging.log4j.core.util.ClockFactory
  super_class: java.lang.Object
{
  public static final java.lang.String PROPERTY_NAME;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "log4j.Clock"

  private static final org.apache.logging.log4j.status.StatusLogger LOGGER;
    descriptor: Lorg/apache/logging/log4j/status/StatusLogger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 37
            invokestatic org.apache.logging.log4j.status.StatusLogger.getLogger:()Lorg/apache/logging/log4j/status/StatusLogger;
            putstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            return
      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 // org.apache.logging.log4j.core.util.ClockFactory this
         0: .line 41
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 42
            return
        end local 0 // org.apache.logging.log4j.core.util.ClockFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/logging/log4j/core/util/ClockFactory;

  public static org.apache.logging.log4j.core.util.Clock getClock();
    descriptor: ()Lorg/apache/logging/log4j/core/util/Clock;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 67
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.createClock:()Lorg/apache/logging/log4j/core/util/Clock;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private static java.util.Map<java.lang.String, org.apache.logging.log4j.util.Supplier<org.apache.logging.log4j.core.util.Clock>> aliases();
    descriptor: ()Ljava/util/Map;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=1, args_size=0
         0: .line 71
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            astore 0 /* result */
        start local 0 // java.util.Map result
         1: .line 72
            aload 0 /* result */
            ldc "SystemClock"
            new org.apache.logging.log4j.core.util.ClockFactory$1
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$1.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         2: .line 73
            aload 0 /* result */
            ldc "SystemMillisClock"
            new org.apache.logging.log4j.core.util.ClockFactory$2
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$2.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         3: .line 74
            aload 0 /* result */
            ldc "CachedClock"
            new org.apache.logging.log4j.core.util.ClockFactory$3
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$3.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         4: .line 75
            aload 0 /* result */
            ldc "CoarseCachedClock"
            new org.apache.logging.log4j.core.util.ClockFactory$4
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$4.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 76
            aload 0 /* result */
            ldc "org.apache.logging.log4j.core.util.CachedClock"
            new org.apache.logging.log4j.core.util.ClockFactory$5
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$5.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         6: .line 77
            aload 0 /* result */
            ldc "org.apache.logging.log4j.core.util.CoarseCachedClock"
            new org.apache.logging.log4j.core.util.ClockFactory$6
            dup
            invokespecial org.apache.logging.log4j.core.util.ClockFactory$6.<init>:()V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         7: .line 78
            aload 0 /* result */
            areturn
        end local 0 // java.util.Map result
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            1    8     0  result  Ljava/util/Map<Ljava/lang/String;Lorg/apache/logging/log4j/util/Supplier<Lorg/apache/logging/log4j/core/util/Clock;>;>;
    Signature: ()Ljava/util/Map<Ljava/lang/String;Lorg/apache/logging/log4j/util/Supplier<Lorg/apache/logging/log4j/core/util/Clock;>;>;

  private static org.apache.logging.log4j.core.util.Clock createClock();
    descriptor: ()Lorg/apache/logging/log4j/core/util/Clock;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=3, args_size=0
         0: .line 82
            invokestatic org.apache.logging.log4j.util.PropertiesUtil.getProperties:()Lorg/apache/logging/log4j/util/PropertiesUtil;
            ldc "log4j.Clock"
            invokevirtual org.apache.logging.log4j.util.PropertiesUtil.getStringProperty:(Ljava/lang/String;)Ljava/lang/String;
            astore 0 /* userRequest */
        start local 0 // java.lang.String userRequest
         1: .line 83
            aload 0 /* userRequest */
            ifnonnull 4
         2: .line 84
            getstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            ldc "Using default SystemClock for timestamps."
            invokevirtual org.apache.logging.log4j.status.StatusLogger.trace:(Ljava/lang/String;)V
         3: .line 85
            new org.apache.logging.log4j.core.util.SystemClock
            dup
            invokespecial org.apache.logging.log4j.core.util.SystemClock.<init>:()V
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.logSupportedPrecision:(Lorg/apache/logging/log4j/core/util/Clock;)Lorg/apache/logging/log4j/core/util/Clock;
            areturn
         4: .line 87
      StackMap locals: java.lang.String
      StackMap stack:
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.aliases:()Ljava/util/Map;
            aload 0 /* userRequest */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.logging.log4j.util.Supplier
            astore 1 /* specified */
        start local 1 // org.apache.logging.log4j.util.Supplier specified
         5: .line 88
            aload 1 /* specified */
            ifnull 8
         6: .line 89
            getstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            ldc "Using specified {} for timestamps."
            aload 0 /* userRequest */
            invokevirtual org.apache.logging.log4j.status.StatusLogger.trace:(Ljava/lang/String;Ljava/lang/Object;)V
         7: .line 90
            aload 1 /* specified */
            invokeinterface org.apache.logging.log4j.util.Supplier.get:()Ljava/lang/Object;
            checkcast org.apache.logging.log4j.core.util.Clock
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.logSupportedPrecision:(Lorg/apache/logging/log4j/core/util/Clock;)Lorg/apache/logging/log4j/core/util/Clock;
            areturn
         8: .line 93
      StackMap locals: org.apache.logging.log4j.util.Supplier
      StackMap stack:
            aload 0 /* userRequest */
            ldc Lorg/apache/logging/log4j/core/util/Clock;
            invokestatic org.apache.logging.log4j.core.util.Loader.newCheckedInstanceOf:(Ljava/lang/String;Ljava/lang/Class;)Ljava/lang/Object;
            checkcast org.apache.logging.log4j.core.util.Clock
            astore 2 /* result */
        start local 2 // org.apache.logging.log4j.core.util.Clock result
         9: .line 94
            getstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            ldc "Using {} for timestamps."
            aload 2 /* result */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual org.apache.logging.log4j.status.StatusLogger.trace:(Ljava/lang/String;Ljava/lang/Object;)V
        10: .line 95
            aload 2 /* result */
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.logSupportedPrecision:(Lorg/apache/logging/log4j/core/util/Clock;)Lorg/apache/logging/log4j/core/util/Clock;
        11: areturn
        end local 2 // org.apache.logging.log4j.core.util.Clock result
        12: .line 96
      StackMap locals:
      StackMap stack: java.lang.Exception
            astore 2 /* e */
        start local 2 // java.lang.Exception e
        13: .line 98
            getstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            ldc "Could not create {}: {}, using default SystemClock for timestamps."
            aload 0 /* userRequest */
            aload 2 /* e */
            invokevirtual org.apache.logging.log4j.status.StatusLogger.error:(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)V
        14: .line 99
            new org.apache.logging.log4j.core.util.SystemClock
            dup
            invokespecial org.apache.logging.log4j.core.util.SystemClock.<init>:()V
            invokestatic org.apache.logging.log4j.core.util.ClockFactory.logSupportedPrecision:(Lorg/apache/logging/log4j/core/util/Clock;)Lorg/apache/logging/log4j/core/util/Clock;
            areturn
        end local 2 // java.lang.Exception e
        end local 1 // org.apache.logging.log4j.util.Supplier specified
        end local 0 // java.lang.String userRequest
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            1   15     0  userRequest  Ljava/lang/String;
            5   15     1    specified  Lorg/apache/logging/log4j/util/Supplier<Lorg/apache/logging/log4j/core/util/Clock;>;
            9   12     2       result  Lorg/apache/logging/log4j/core/util/Clock;
           13   15     2            e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           8    11      12  Class java.lang.Exception

  private static org.apache.logging.log4j.core.util.Clock logSupportedPrecision(org.apache.logging.log4j.core.util.Clock);
    descriptor: (Lorg/apache/logging/log4j/core/util/Clock;)Lorg/apache/logging/log4j/core/util/Clock;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // org.apache.logging.log4j.core.util.Clock clock
         0: .line 104
            aload 0 /* clock */
            instanceof org.apache.logging.log4j.core.time.PreciseClock
            ifeq 1
            ldc "supports"
            goto 2
      StackMap locals:
      StackMap stack:
         1: ldc "does not support"
      StackMap locals:
      StackMap stack: java.lang.String
         2: astore 1 /* support */
        start local 1 // java.lang.String support
         3: .line 105
            getstatic org.apache.logging.log4j.core.util.ClockFactory.LOGGER:Lorg/apache/logging/log4j/status/StatusLogger;
            ldc "{} {} precise timestamps."
            aload 0 /* clock */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            aload 1 /* support */
            invokevirtual org.apache.logging.log4j.status.StatusLogger.debug:(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)V
         4: .line 106
            aload 0 /* clock */
            areturn
        end local 1 // java.lang.String support
        end local 0 // org.apache.logging.log4j.core.util.Clock clock
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    5     0    clock  Lorg/apache/logging/log4j/core/util/Clock;
            3    5     1  support  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      clock  final
}
SourceFile: "ClockFactory.java"
NestMembers:
  org.apache.logging.log4j.core.util.ClockFactory$1  org.apache.logging.log4j.core.util.ClockFactory$2  org.apache.logging.log4j.core.util.ClockFactory$3  org.apache.logging.log4j.core.util.ClockFactory$4  org.apache.logging.log4j.core.util.ClockFactory$5  org.apache.logging.log4j.core.util.ClockFactory$6
InnerClasses:
  org.apache.logging.log4j.core.util.ClockFactory$1
  org.apache.logging.log4j.core.util.ClockFactory$2
  org.apache.logging.log4j.core.util.ClockFactory$3
  org.apache.logging.log4j.core.util.ClockFactory$4
  org.apache.logging.log4j.core.util.ClockFactory$5
  org.apache.logging.log4j.core.util.ClockFactory$6