Enum HashAlgorithm

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<HashAlgorithm>

    public enum HashAlgorithm
    extends java.lang.Enum<HashAlgorithm>
    Known hashing algorithms for locating a server for a key. Note that all hash algorithms return 64-bits of hash, but only the lower 32-bits are significant. This allows a positive 32-bit number to be returned for all cases.
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static long FNV_32_INIT  
      private static long FNV_32_PRIME  
      private static long FNV_64_INIT  
      private static long FNV_64_PRIME  
      private static java.lang.ThreadLocal<java.security.MessageDigest> md5Local  
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private HashAlgorithm()  
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static byte[] computeMd5​(java.lang.String k)
      Get the md5 of the given key.
      long hash​(java.lang.String k)
      Compute the hash for the given key.
      static HashAlgorithm valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static HashAlgorithm[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • NATIVE_HASH

        public static final HashAlgorithm NATIVE_HASH
        Native hash (String.hashCode()).
      • CRC32_HASH

        public static final HashAlgorithm CRC32_HASH
        CRC32_HASH as used by the perl API. This will be more consistent both across multiple API users as well as java versions, but is mostly likely significantly slower.
      • FNV1_64_HASH

        public static final HashAlgorithm FNV1_64_HASH
        FNV hashes are designed to be fast while maintaining a low collision rate. The FNV speed allows one to quickly hash lots of data while maintaining a reasonable collision rate.
      • FNV1A_64_HASH

        public static final HashAlgorithm FNV1A_64_HASH
        Variation of FNV.
      • FNV1_32_HASH

        public static final HashAlgorithm FNV1_32_HASH
        32-bit FNV1.
      • FNV1A_32_HASH

        public static final HashAlgorithm FNV1A_32_HASH
        32-bit FNV1a.
      • KETAMA_HASH

        public static final HashAlgorithm KETAMA_HASH
        MD5-based hash algorithm used by ketama.
      • MYSQL_HASH

        public static final HashAlgorithm MYSQL_HASH
        From mysql source
      • LUA_HASH

        public static final HashAlgorithm LUA_HASH
        From lua source,it is used for long key
      • ONE_AT_A_TIME

        public static final HashAlgorithm ONE_AT_A_TIME
        The Jenkins One-at-a-time hash ,please see http://www.burtleburtle.net/bob/hash/doobs.html
    • Constructor Detail

      • HashAlgorithm

        private HashAlgorithm()
    • Method Detail

      • values

        public static HashAlgorithm[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (HashAlgorithm c : HashAlgorithm.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static HashAlgorithm valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • hash

        public long hash​(java.lang.String k)
        Compute the hash for the given key.
        Returns:
        a positive integer hash
      • computeMd5

        public static byte[] computeMd5​(java.lang.String k)
        Get the md5 of the given key.