Class CheckpointOperation

    • Field Detail

      • redoLWM

        protected long redoLWM
      • undoLWM

        protected long undoLWM
      • transactionTable

        protected Formatable transactionTable
    • Constructor Detail

      • CheckpointOperation

        public CheckpointOperation​(long redoLWM,
                                   long undoLWM,
                                   Formatable ttab)
      • CheckpointOperation

        public CheckpointOperation()
    • Method Detail

      • writeExternal

        public void writeExternal​(java.io.ObjectOutput out)
                           throws java.io.IOException
        Specified by:
        writeExternal in interface java.io.Externalizable
        Throws:
        java.io.IOException
      • readExternal

        public void readExternal​(java.io.ObjectInput in)
                          throws java.io.IOException,
                                 java.lang.ClassNotFoundException
        Specified by:
        readExternal in interface java.io.Externalizable
        Throws:
        java.io.IOException
        java.lang.ClassNotFoundException
      • getTypeFormatId

        public int getTypeFormatId()
        Return my format identifier.
        Specified by:
        getTypeFormatId in interface TypedFormat
        Returns:
        The identifier. (A UUID stuffed in an array of 16 bytes).
      • doMe

        public void doMe​(Transaction xact,
                         LogInstant instant,
                         LimitObjectInput in)
                  throws StandardException
        Nothing to do unless we are rollforward recovery; Redoing of checkpoints during rollforward recovery allows us to restart the roll-forward recovery from the last checkpoint redone during rollforward recovery, if we happen to crash during the roll-forward recovery process. Another reason why we need to do this is dropped table stub files removed at checkpoint because the containerids may have been reused after a checkpoint if the system was rebooted.
        Specified by:
        doMe in interface Loggable
        Parameters:
        xact - the Transaction
        instant - the log instant of this operation
        in - optional data
        Throws:
        StandardException - Standard Derby policy.
      • getPreparedLog

        public ByteArray getPreparedLog()
        the default for prepared log is always null for all the operations that don't have optionalData. If an operation has optional data, the operation need to prepare the optional data for this method. Checkpoint has no optional data to write out
        Specified by:
        getPreparedLog in interface Loggable
      • group

        public int group()
        Checkpoint is a raw store operation
        Specified by:
        group in interface Loggable
      • redoLWM

        public long redoLWM()
        Access attributes of the checkpoint record
      • undoLWM

        public long undoLWM()
      • getTransactionTable

        public Formatable getTransactionTable()
      • toString

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