https://cassandra.apache.org: The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
  • Andres de la Peña
  • Avinash Lakshman
  • Aleksey Yeschenko
  • Aaron Morton
  • Ariel Weisberg
  • Blake Eggleston
  • Benedict Elliott Smith
  • Benjamin Lerer
  • Branimir Lambov
  • Brandon Williams
  • Carl Yeksigian
  • David Brosiusd
  • Dikang Gu
  • Eric Evans
  • Gary Dusbabek
  • Chris Goffinet
  • Alex Petrov
  • Laine Jaakko Olavi
  • T Jake Luciani
  • Jason Brown
  • Jonathan Ellis
  • Jake Farrell
  • Jeff Jirsa
  • Joel Knighton
  • Josh McKenzie
  • Johan Oskarsson
  • Jun Rao
  • Jay Zhuang
  • Sankalp Kohli
  • Marcus Eriksson
  • Michael Semb Wever
  • Mikhail Stepura
  • Michael Shuler
  • Paulo Motta
  • Prashant Malik
  • Robert Stupp
  • Peter Schuller
  • Sam Tunnicliffe
  • Sylvain Lebresne
  • Stefania Alborghetti
  • Tyler Hobbs
  • Vijay Parthasarathy
  • Pavel Yaskevich
  • Yuki Morishita
  • Nate McCall 
public class org.apache.cassandra.utils.GuidGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.cassandra.utils.GuidGenerator
  super_class: java.lang.Object
{
  private static final java.util.Random myRand;
    descriptor: Ljava/util/Random;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final java.security.SecureRandom mySecureRand;
    descriptor: Ljava/security/SecureRandom;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final java.lang.String s_id;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=3, args_size=0
         0: .line 34
            ldc "java.security.egd"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            ifnonnull 2
         1: .line 36
            ldc "java.security.egd"
            ldc "file:/dev/urandom"
            invokestatic java.lang.System.setProperty:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            pop
         2: .line 38
      StackMap locals:
      StackMap stack:
            new java.security.SecureRandom
            dup
            invokespecial java.security.SecureRandom.<init>:()V
            putstatic org.apache.cassandra.utils.GuidGenerator.mySecureRand:Ljava/security/SecureRandom;
         3: .line 39
            getstatic org.apache.cassandra.utils.GuidGenerator.mySecureRand:Ljava/security/SecureRandom;
            invokevirtual java.security.SecureRandom.nextLong:()J
            lstore 0 /* secureInitializer */
        start local 0 // long secureInitializer
         4: .line 40
            new java.util.Random
            dup
            lload 0 /* secureInitializer */
            invokespecial java.util.Random.<init>:(J)V
            putstatic org.apache.cassandra.utils.GuidGenerator.myRand:Ljava/util/Random;
         5: .line 43
            invokestatic java.net.InetAddress.getLocalHost:()Ljava/net/InetAddress;
            invokevirtual java.net.InetAddress.toString:()Ljava/lang/String;
            putstatic org.apache.cassandra.utils.GuidGenerator.s_id:Ljava/lang/String;
         6: .line 44
            goto 9
         7: .line 45
      StackMap locals: long
      StackMap stack: java.net.UnknownHostException
            astore 2 /* e */
        start local 2 // java.net.UnknownHostException e
         8: .line 47
            new java.lang.AssertionError
            dup
            aload 2 /* e */
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
        end local 2 // java.net.UnknownHostException e
        end local 0 // long secureInitializer
         9: .line 49
      StackMap locals:
      StackMap stack:
            return
      LocalVariableTable:
        Start  End  Slot               Name  Signature
            4    9     0  secureInitializer  J
            8    9     2                  e  Ljava/net/UnknownHostException;
      Exception table:
        from    to  target  type
           5     6       7  Class java.net.UnknownHostException

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.cassandra.utils.GuidGenerator this
         0: .line 26
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.cassandra.utils.GuidGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/cassandra/utils/GuidGenerator;

  public static java.lang.String guid();
    descriptor: ()Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=4, args_size=0
         0: .line 53
            invokestatic org.apache.cassandra.utils.GuidGenerator.guidAsBytes:()Ljava/nio/ByteBuffer;
            astore 0 /* array */
        start local 0 // java.nio.ByteBuffer array
         1: .line 55
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         2: .line 56
            aload 0 /* array */
            invokevirtual java.nio.ByteBuffer.position:()I
            istore 2 /* j */
        start local 2 // int j
         3: goto 8
         4: .line 58
      StackMap locals: java.nio.ByteBuffer java.lang.StringBuilder int
      StackMap stack:
            aload 0 /* array */
            iload 2 /* j */
            invokevirtual java.nio.ByteBuffer.get:(I)B
            sipush 255
            iand
            istore 3 /* b */
        start local 3 // int b
         5: .line 59
            iload 3 /* b */
            bipush 16
            if_icmpge 6
            aload 1 /* sb */
            bipush 48
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
         6: .line 60
      StackMap locals: int
      StackMap stack:
            aload 1 /* sb */
            iload 3 /* b */
            invokestatic java.lang.Integer.toHexString:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        end local 3 // int b
         7: .line 56
            iinc 2 /* j */ 1
      StackMap locals:
      StackMap stack:
         8: iload 2 /* j */
            aload 0 /* array */
            invokevirtual java.nio.ByteBuffer.limit:()I
            if_icmplt 4
        end local 2 // int j
         9: .line 63
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokestatic org.apache.cassandra.utils.GuidGenerator.convertToStandardFormat:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuilder sb
        end local 0 // java.nio.ByteBuffer array
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            1   10     0  array  Ljava/nio/ByteBuffer;
            2   10     1     sb  Ljava/lang/StringBuilder;
            3    9     2      j  I
            5    7     3      b  I

  public static java.lang.String guidToString(byte[]);
    descriptor: ([B)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=4, args_size=1
        start local 0 // byte[] bytes
         0: .line 68
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         1: .line 69
            iconst_0
            istore 2 /* j */
        start local 2 // int j
         2: goto 7
         3: .line 71
      StackMap locals: java.lang.StringBuilder int
      StackMap stack:
            aload 0 /* bytes */
            iload 2 /* j */
            baload
            sipush 255
            iand
            istore 3 /* b */
        start local 3 // int b
         4: .line 72
            iload 3 /* b */
            bipush 16
            if_icmpge 5
            aload 1 /* sb */
            bipush 48
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
         5: .line 73
      StackMap locals: int
      StackMap stack:
            aload 1 /* sb */
            iload 3 /* b */
            invokestatic java.lang.Integer.toHexString:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        end local 3 // int b
         6: .line 69
            iinc 2 /* j */ 1
      StackMap locals:
      StackMap stack:
         7: iload 2 /* j */
            aload 0 /* bytes */
            arraylength
            if_icmplt 3
        end local 2 // int j
         8: .line 76
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokestatic org.apache.cassandra.utils.GuidGenerator.convertToStandardFormat:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuilder sb
        end local 0 // byte[] bytes
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    9     0  bytes  [B
            1    9     1     sb  Ljava/lang/StringBuilder;
            2    8     2      j  I
            4    6     3      b  I
    MethodParameters:
       Name  Flags
      bytes  

  public static java.nio.ByteBuffer guidAsBytes(java.util.Random, java.lang.String, long);
    descriptor: (Ljava/util/Random;Ljava/lang/String;J)Ljava/nio/ByteBuffer;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=8, args_size=3
        start local 0 // java.util.Random random
        start local 1 // java.lang.String hostId
        start local 2 // long time
         0: .line 81
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 4 /* sbValueBeforeMD5 */
        start local 4 // java.lang.StringBuilder sbValueBeforeMD5
         1: .line 82
            aload 0 /* random */
            invokevirtual java.util.Random.nextLong:()J
            lstore 5 /* rand */
        start local 5 // long rand
         2: .line 83
            aload 4 /* sbValueBeforeMD5 */
            aload 1 /* hostId */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         3: .line 84
            ldc ":"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         4: .line 85
            lload 2 /* time */
            invokestatic java.lang.Long.toString:(J)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         5: .line 86
            ldc ":"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         6: .line 87
            lload 5 /* rand */
            invokestatic java.lang.Long.toString:(J)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         7: .line 89
            aload 4 /* sbValueBeforeMD5 */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 7 /* valueBeforeMD5 */
        start local 7 // java.lang.String valueBeforeMD5
         8: .line 90
            invokestatic org.apache.cassandra.utils.FBUtilities.threadLocalMD5Digest:()Ljava/security/MessageDigest;
            aload 7 /* valueBeforeMD5 */
            invokevirtual java.lang.String.getBytes:()[B
            invokevirtual java.security.MessageDigest.digest:([B)[B
            invokestatic java.nio.ByteBuffer.wrap:([B)Ljava/nio/ByteBuffer;
            areturn
        end local 7 // java.lang.String valueBeforeMD5
        end local 5 // long rand
        end local 4 // java.lang.StringBuilder sbValueBeforeMD5
        end local 2 // long time
        end local 1 // java.lang.String hostId
        end local 0 // java.util.Random random
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    9     0            random  Ljava/util/Random;
            0    9     1            hostId  Ljava/lang/String;
            0    9     2              time  J
            1    9     4  sbValueBeforeMD5  Ljava/lang/StringBuilder;
            2    9     5              rand  J
            8    9     7    valueBeforeMD5  Ljava/lang/String;
    MethodParameters:
        Name  Flags
      random  
      hostId  
      time    

  public static java.nio.ByteBuffer guidAsBytes();
    descriptor: ()Ljava/nio/ByteBuffer;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 95
            getstatic org.apache.cassandra.utils.GuidGenerator.myRand:Ljava/util/Random;
            getstatic org.apache.cassandra.utils.GuidGenerator.s_id:Ljava/lang/String;
            invokestatic java.lang.System.currentTimeMillis:()J
            invokestatic org.apache.cassandra.utils.GuidGenerator.guidAsBytes:(Ljava/util/Random;Ljava/lang/String;J)Ljava/nio/ByteBuffer;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private static java.lang.String convertToStandardFormat(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=3, args_size=1
        start local 0 // java.lang.String valueAfterMD5
         0: .line 105
            aload 0 /* valueAfterMD5 */
            invokevirtual java.lang.String.toUpperCase:()Ljava/lang/String;
            astore 1 /* raw */
        start local 1 // java.lang.String raw
         1: .line 106
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 2 /* sb */
        start local 2 // java.lang.StringBuilder sb
         2: .line 107
            aload 2 /* sb */
            aload 1 /* raw */
            iconst_0
            bipush 8
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         3: .line 108
            ldc "-"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         4: .line 109
            aload 1 /* raw */
            bipush 8
            bipush 12
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         5: .line 110
            ldc "-"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         6: .line 111
            aload 1 /* raw */
            bipush 12
            bipush 16
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         7: .line 112
            ldc "-"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         8: .line 113
            aload 1 /* raw */
            bipush 16
            bipush 20
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         9: .line 114
            ldc "-"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        10: .line 115
            aload 1 /* raw */
            bipush 20
            invokevirtual java.lang.String.substring:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        11: .line 116
            aload 2 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 2 // java.lang.StringBuilder sb
        end local 1 // java.lang.String raw
        end local 0 // java.lang.String valueAfterMD5
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0   12     0  valueAfterMD5  Ljava/lang/String;
            1   12     1            raw  Ljava/lang/String;
            2   12     2             sb  Ljava/lang/StringBuilder;
    MethodParameters:
               Name  Flags
      valueAfterMD5  
}
SourceFile: "GuidGenerator.java"