Package edu.caltech.nanodb.storage.writeahead

Enum WALRecordType

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<WALRecordType>
    public enum WALRecordType
extends java.lang.Enum<WALRecordType>
    This enumeration specifies the various types of records that can appear in the write-ahead log, along with their numeric values that actually appear within the write-ahead log.

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      ABORT_TXN
      The record represents a "<Ti: abort transaction>" record.
      COMMIT_TXN
      The record represents a "<Ti: commit transaction>" record.
      START_TXN
      The record represents a "<Ti: start transaction>" record.
      UPDATE_PAGE
      The record represents a "<Ti: update P → P' >" record.
      UPDATE_PAGE_REDO_ONLY
      The record represents a "<Ti: update P' (redo only)>" record.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private int id  

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private WALRecordType​(int id)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getID()  
      static WALRecordType valueOf​(int id)
      Given a numeric type ID, returns the corresponding type value for the ID, or null if no type corresponds to the ID.
      static WALRecordType valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static WALRecordType[] 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

      • START_TXN

        public static final WALRecordType START_TXN
        The record represents a "<Ti: start transaction>" record.

      • UPDATE_PAGE

        public static final WALRecordType UPDATE_PAGE
        The record represents a "<Ti: update P → P' >" record.

      • UPDATE_PAGE_REDO_ONLY

        public static final WALRecordType UPDATE_PAGE_REDO_ONLY
        The record represents a "<Ti: update P' (redo only)>" record.

      • COMMIT_TXN

        public static final WALRecordType COMMIT_TXN
        The record represents a "<Ti: commit transaction>" record.

      • ABORT_TXN

        public static final WALRecordType ABORT_TXN
        The record represents a "<Ti: abort transaction>" record.

    • Field Detail

      • id

        private int id

    • Constructor Detail

      • WALRecordType

        private WALRecordType​(int id)

    • Method Detail

      • values

        public static WALRecordType[] 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 (WALRecordType c : WALRecordType.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static WALRecordType 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

      • getID

        public int getID()

      • valueOf

        public static WALRecordType valueOf​(int id)
        Given a numeric type ID, returns the corresponding type value for the ID, or null if no type corresponds to the ID.
        Parameters:
        id - the numeric ID of the type to retrieve
        Returns:
        the type-value with that ID, or null if not found