https://tomcat.apache.org/: Tomcat Connectors and HTTP parser 
public final class org.apache.tomcat.util.http.FastHttpDateFormat
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.tomcat.util.http.FastHttpDateFormat
  super_class: java.lang.Object
{
  private static final int CACHE_SIZE;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final java.lang.String DATE_RFC5322;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "EEE, dd MMM yyyy HH:mm:ss z"

  private static final java.lang.String DATE_OBSOLETE_RFC850;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "EEEEEE, dd-MMM-yy HH:mm:ss zzz"

  private static final java.lang.String DATE_OBSOLETE_ASCTIME;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "EEE MMMM d HH:mm:ss yyyy"

  private static final org.apache.tomcat.util.http.ConcurrentDateFormat FORMAT_RFC5322;
    descriptor: Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final org.apache.tomcat.util.http.ConcurrentDateFormat FORMAT_OBSOLETE_RFC850;
    descriptor: Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final org.apache.tomcat.util.http.ConcurrentDateFormat FORMAT_OBSOLETE_ASCTIME;
    descriptor: Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final org.apache.tomcat.util.http.ConcurrentDateFormat[] httpParseFormats;
    descriptor: [Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static volatile long currentDateGenerated;
    descriptor: J
    flags: (0x004a) ACC_PRIVATE, ACC_STATIC, ACC_VOLATILE

  private static java.lang.String currentDate;
    descriptor: Ljava/lang/String;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC

  private static final java.util.Map<java.lang.Long, java.lang.String> formatCache;
    descriptor: Ljava/util/Map;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/Long;Ljava/lang/String;>;

  private static final java.util.Map<java.lang.String, java.lang.Long> parseCache;
    descriptor: Ljava/util/Map;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Ljava/lang/Long;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=1, args_size=0
         0: .line 38
            ldc "org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE"
            ldc "1000"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
         1: .line 37
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE:I
         2: .line 54
            ldc "GMT"
            invokestatic java.util.TimeZone.getTimeZone:(Ljava/lang/String;)Ljava/util/TimeZone;
            astore 0 /* tz */
        start local 0 // java.util.TimeZone tz
         3: .line 56
            new org.apache.tomcat.util.http.ConcurrentDateFormat
            dup
            ldc "EEE, dd MMM yyyy HH:mm:ss z"
            getstatic java.util.Locale.US:Ljava/util/Locale;
            aload 0 /* tz */
            invokespecial org.apache.tomcat.util.http.ConcurrentDateFormat.<init>:(Ljava/lang/String;Ljava/util/Locale;Ljava/util/TimeZone;)V
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_RFC5322:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
         4: .line 57
            new org.apache.tomcat.util.http.ConcurrentDateFormat
            dup
            ldc "EEEEEE, dd-MMM-yy HH:mm:ss zzz"
            getstatic java.util.Locale.US:Ljava/util/Locale;
            aload 0 /* tz */
            invokespecial org.apache.tomcat.util.http.ConcurrentDateFormat.<init>:(Ljava/lang/String;Ljava/util/Locale;Ljava/util/TimeZone;)V
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_OBSOLETE_RFC850:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
         5: .line 58
            new org.apache.tomcat.util.http.ConcurrentDateFormat
            dup
            ldc "EEE MMMM d HH:mm:ss yyyy"
            getstatic java.util.Locale.US:Ljava/util/Locale;
            aload 0 /* tz */
            invokespecial org.apache.tomcat.util.http.ConcurrentDateFormat.<init>:(Ljava/lang/String;Ljava/util/Locale;Ljava/util/TimeZone;)V
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_OBSOLETE_ASCTIME:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
         6: .line 60
            iconst_3
            anewarray org.apache.tomcat.util.http.ConcurrentDateFormat
            dup
            iconst_0
         7: .line 61
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_RFC5322:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            aastore
            dup
            iconst_1
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_OBSOLETE_RFC850:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            aastore
            dup
            iconst_2
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_OBSOLETE_ASCTIME:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            aastore
         8: .line 60
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.httpParseFormats:[Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
        end local 0 // java.util.TimeZone tz
         9: .line 67
            lconst_0
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDateGenerated:J
        10: .line 73
            aconst_null
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDate:Ljava/lang/String;
        11: .line 79
            new java.util.concurrent.ConcurrentHashMap
            dup
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE:I
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:(I)V
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.formatCache:Ljava/util/Map;
        12: .line 85
            new java.util.concurrent.ConcurrentHashMap
            dup
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE:I
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:(I)V
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.parseCache:Ljava/util/Map;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            3    9     0    tz  Ljava/util/TimeZone;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.http.FastHttpDateFormat this
         0: .line 31
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.tomcat.util.http.FastHttpDateFormat this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/http/FastHttpDateFormat;

  public static final java.lang.String getCurrentDate();
    descriptor: ()Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Code:
      stack=5, locals=2, args_size=0
         0: .line 96
            invokestatic java.lang.System.currentTimeMillis:()J
            lstore 0 /* now */
        start local 0 // long now
         1: .line 97
            lload 0 /* now */
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDateGenerated:J
            lsub
            ldc 1000
            lcmp
            ifle 4
         2: .line 98
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_RFC5322:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            new java.util.Date
            dup
            lload 0 /* now */
            invokespecial java.util.Date.<init>:(J)V
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.format:(Ljava/util/Date;)Ljava/lang/String;
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDate:Ljava/lang/String;
         3: .line 99
            lload 0 /* now */
            putstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDateGenerated:J
         4: .line 101
      StackMap locals: long
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.currentDate:Ljava/lang/String;
            areturn
        end local 0 // long now
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            1    5     0   now  J

  public static final java.lang.String formatDate(long);
    descriptor: (J)Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Code:
      stack=5, locals=5, args_size=1
        start local 0 // long value
         0: .line 111
            lload 0 /* value */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            astore 2 /* longValue */
        start local 2 // java.lang.Long longValue
         1: .line 112
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.formatCache:Ljava/util/Map;
            aload 2 /* longValue */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.String
            astore 3 /* cachedDate */
        start local 3 // java.lang.String cachedDate
         2: .line 113
            aload 3 /* cachedDate */
            ifnull 4
         3: .line 114
            aload 3 /* cachedDate */
            areturn
         4: .line 117
      StackMap locals: java.lang.Long java.lang.String
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.FORMAT_RFC5322:Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            new java.util.Date
            dup
            lload 0 /* value */
            invokespecial java.util.Date.<init>:(J)V
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.format:(Ljava/util/Date;)Ljava/lang/String;
            astore 4 /* newDate */
        start local 4 // java.lang.String newDate
         5: .line 118
            aload 2 /* longValue */
            aload 4 /* newDate */
            invokestatic org.apache.tomcat.util.http.FastHttpDateFormat.updateFormatCache:(Ljava/lang/Long;Ljava/lang/String;)V
         6: .line 119
            aload 4 /* newDate */
            areturn
        end local 4 // java.lang.String newDate
        end local 3 // java.lang.String cachedDate
        end local 2 // java.lang.Long longValue
        end local 0 // long value
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    7     0       value  J
            1    7     2   longValue  Ljava/lang/Long;
            2    7     3  cachedDate  Ljava/lang/String;
            5    7     4     newDate  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      value  

  public static final long parseDate(java.lang.String);
    descriptor: (Ljava/lang/String;)J
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Code:
      stack=4, locals=5, args_size=1
        start local 0 // java.lang.String value
         0: .line 131
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.parseCache:Ljava/util/Map;
            aload 0 /* value */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.Long
            astore 1 /* cachedDate */
        start local 1 // java.lang.Long cachedDate
         1: .line 132
            aload 1 /* cachedDate */
            ifnull 3
         2: .line 133
            aload 1 /* cachedDate */
            invokevirtual java.lang.Long.longValue:()J
            lreturn
         3: .line 136
      StackMap locals: java.lang.Long
      StackMap stack:
            ldc -1
            lstore 2 /* date */
        start local 2 // long date
         4: .line 137
            iconst_0
            istore 4 /* i */
        start local 4 // int i
         5: goto 11
         6: .line 139
      StackMap locals: long int
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.httpParseFormats:[Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            iload 4 /* i */
            aaload
            aload 0 /* value */
            invokevirtual org.apache.tomcat.util.http.ConcurrentDateFormat.parse:(Ljava/lang/String;)Ljava/util/Date;
            invokevirtual java.util.Date.getTime:()J
            lstore 2 /* date */
         7: .line 140
            aload 0 /* value */
            lload 2 /* date */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokestatic org.apache.tomcat.util.http.FastHttpDateFormat.updateParseCache:(Ljava/lang/String;Ljava/lang/Long;)V
         8: .line 141
            goto 10
      StackMap locals:
      StackMap stack: java.text.ParseException
         9: pop
        10: .line 137
      StackMap locals:
      StackMap stack:
            iinc 4 /* i */ 1
      StackMap locals:
      StackMap stack:
        11: lload 2 /* date */
            ldc -1
            lcmp
            ifne 12
            iload 4 /* i */
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.httpParseFormats:[Lorg/apache/tomcat/util/http/ConcurrentDateFormat;
            arraylength
            if_icmplt 6
        end local 4 // int i
        12: .line 146
      StackMap locals:
      StackMap stack:
            lload 2 /* date */
            lreturn
        end local 2 // long date
        end local 1 // java.lang.Long cachedDate
        end local 0 // java.lang.String value
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   13     0       value  Ljava/lang/String;
            1   13     1  cachedDate  Ljava/lang/Long;
            4   13     2        date  J
            5   12     4           i  I
      Exception table:
        from    to  target  type
           6     8       9  Class java.text.ParseException
    MethodParameters:
       Name  Flags
      value  

  private static void updateFormatCache(java.lang.Long, java.lang.String);
    descriptor: (Ljava/lang/Long;Ljava/lang/String;)V
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // java.lang.Long key
        start local 1 // java.lang.String value
         0: .line 154
            aload 1 /* value */
            ifnonnull 2
         1: .line 155
            return
         2: .line 157
      StackMap locals:
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.formatCache:Ljava/util/Map;
            invokeinterface java.util.Map.size:()I
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE:I
            if_icmple 4
         3: .line 158
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.formatCache:Ljava/util/Map;
            invokeinterface java.util.Map.clear:()V
         4: .line 160
      StackMap locals:
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.formatCache:Ljava/util/Map;
            aload 0 /* key */
            aload 1 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 161
            return
        end local 1 // java.lang.String value
        end local 0 // java.lang.Long key
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    6     0    key  Ljava/lang/Long;
            0    6     1  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      key    
      value  

  private static void updateParseCache(java.lang.String, java.lang.Long);
    descriptor: (Ljava/lang/String;Ljava/lang/Long;)V
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // java.lang.String key
        start local 1 // java.lang.Long value
         0: .line 168
            aload 1 /* value */
            ifnonnull 2
         1: .line 169
            return
         2: .line 171
      StackMap locals:
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.parseCache:Ljava/util/Map;
            invokeinterface java.util.Map.size:()I
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE:I
            if_icmple 4
         3: .line 172
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.parseCache:Ljava/util/Map;
            invokeinterface java.util.Map.clear:()V
         4: .line 174
      StackMap locals:
      StackMap stack:
            getstatic org.apache.tomcat.util.http.FastHttpDateFormat.parseCache:Ljava/util/Map;
            aload 0 /* key */
            aload 1 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 175
            return
        end local 1 // java.lang.Long value
        end local 0 // java.lang.String key
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    6     0    key  Ljava/lang/String;
            0    6     1  value  Ljava/lang/Long;
    MethodParameters:
       Name  Flags
      key    
      value  
}
SourceFile: "FastHttpDateFormat.java"