Package org.apache.cassandra.dht

Class Murmur3Partitioner.LongToken

    • Field Detail

      • token

        public final long token

    • Constructor Detail

      • LongToken

        public LongToken​(long token)

    • Method Detail

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • equals

        public boolean equals​(java.lang.Object obj)
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object

      • compareTo

        public int compareTo​(Token o)

      • asComparableBytes

        public ByteSource asComparableBytes​(ByteComparable.Version version)
        Description copied from class: Token
        Produce a weakly prefix-free byte-comparable representation of the token, i.e. such a sequence of bytes that any pair x, y of valid tokens of this type and any bytes b1, b2 between 0x10 and 0xEF, (+ stands for concatenation) compare(x, y) == compareLexicographicallyUnsigned(asByteComparable(x)+b1, asByteComparable(y)+b2) (i.e. the values compare like the original type, and an added 0x10-0xEF byte at the end does not change that) and: asByteComparable(x)+b1 is not a prefix of asByteComparable(y) (weakly prefix free) (i.e. a valid representation of a value may be a prefix of another valid representation of a value only if the following byte in the latter is smaller than 0x10 or larger than 0xEF). These properties are trivially true if the encoding compares correctly and is prefix free, but also permits a little more freedom that enables somewhat more efficient encoding of arbitrary-length byte-comparable blobs.
        Specified by:
        asComparableBytes in class Token

      • getHeapSize

        public long getHeapSize()
        Specified by:
        getHeapSize in class Token

      • getTokenValue

        public java.lang.Object getTokenValue()
        Specified by:
        getTokenValue in class Token

      • getLongValue

        public long getLongValue()
        Description copied from class: Token
        This method exists so that callers can access the primitive long value for this Token, if one exits. It is especially useful when the auto-boxing induced by a call to Token.getTokenValue() would be unacceptable for reasons of performance.
        Overrides:
        getLongValue in class Token
        Returns:
        the primitive long value of this token, if one exists

      • size

        public double size​(Token next)
        Description copied from class: Token
        Returns a measure for the token space covered between this token and next. Used by the token allocation algorithm (see CASSANDRA-7032).
        Specified by:
        size in class Token

      • nextValidToken

        public Murmur3Partitioner.LongToken nextValidToken()
        Description copied from class: Token
        Returns the next possible token in the token space, one that compares greater than this and such that there is no other token that sits between this token and it in the token order. This is not possible for all token types, esp. for comparison-based tokens such as the LocalPartioner used for classic secondary indexes. Used to avoid clashes between nodes in separate datacentres trying to use the same token via the token allocation algorithm, as well as in constructing token ranges for sstables.
        Specified by:
        nextValidToken in class Token

      • keyForToken

        public static java.nio.ByteBuffer keyForToken​(long token)

      • keyForToken

        public static java.nio.ByteBuffer keyForToken​(Murmur3Partitioner.LongToken token)
        Reverses murmur3 to find a possible 16 byte key that generates a given token