Package com.bytedesk.core.uid.impl

Class BitsAllocator

java.lang.Object
com.bytedesk.core.uid.impl.BitsAllocator
public class BitsAllocator extends Object
Allocate 64 bits for the UID(long)
sign (fixed 1bit) -> deltaSecond -> workerId -> sequence(within the same second)
Author:
yutianbao

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private final long
    maxDeltaSeconds
    Max value for workId sequence
    private final long
    maxSequence
     
    private final long
    maxWorkerId
     
    private final int
    sequenceBits
     
    private int
    signBits
    Bits for [sign-> second-> workId-> sequence]
    private final int
    timestampBits
     
    private final int
    timestampShift
    Shift for timestamp workerId
    static final int
    TOTAL_BITS
    Total 64 bits
    private final int
    workerIdBits
     
    private final int
    workerIdShift
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    BitsAllocator(int timestampBits, int workerIdBits, int sequenceBits)
    Constructor with timestampBits, workerIdBits, sequenceBits
    The highest bit used for sign, so 63 bits for timestampBits, workerIdBits, sequenceBits

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    allocate(long deltaSeconds, long workerId, long sequence)
    Allocate bits for UID according to delta seconds workerId sequence
    Note that: The highest bit will always be 0 for sign

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • TOTAL_BITS

      public static final int TOTAL_BITS
      Total 64 bits
      See Also:

    • signBits

      private int signBits
      Bits for [sign-> second-> workId-> sequence]

    • timestampBits

      private final int timestampBits

    • workerIdBits

      private final int workerIdBits

    • sequenceBits

      private final int sequenceBits

    • maxDeltaSeconds

      private final long maxDeltaSeconds
      Max value for workId sequence

    • maxWorkerId

      private final long maxWorkerId

    • maxSequence

      private final long maxSequence

    • timestampShift

      private final int timestampShift
      Shift for timestamp workerId

    • workerIdShift

      private final int workerIdShift

  • Constructor Details

    • BitsAllocator

      public BitsAllocator(int timestampBits, int workerIdBits, int sequenceBits)
      Constructor with timestampBits, workerIdBits, sequenceBits
      The highest bit used for sign, so 63 bits for timestampBits, workerIdBits, sequenceBits

  • Method Details

    • allocate

      public long allocate(long deltaSeconds, long workerId, long sequence)
      Allocate bits for UID according to delta seconds workerId sequence
      Note that: The highest bit will always be 0 for sign
      Parameters:
      deltaSeconds -
      workerId -
      sequence -
      Returns: