Class SetReservedSpaceOperation

    • Field Detail

      • doMeSlot

        protected int doMeSlot
      • recordId

        protected int recordId
      • newValue

        protected int newValue
      • oldValue

        protected int oldValue
    • Constructor Detail

      • SetReservedSpaceOperation

        SetReservedSpaceOperation​(BasePage page,
                                  int slot,
                                  int recordId,
                                  int newValue,
                                  int oldValue)
      • SetReservedSpaceOperation

        public SetReservedSpaceOperation()
    • Method Detail

      • getTypeFormatId

        public int getTypeFormatId()
        Return my format identifier.
        Returns:
        The identifier. (A UUID stuffed in an array of 16 bytes).
      • writeExternal

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

        public void readExternal​(java.io.ObjectInput in)
                          throws java.io.IOException,
                                 java.lang.ClassNotFoundException
        Read this in
        Specified by:
        readExternal in interface java.io.Externalizable
        Overrides:
        readExternal in class PageBasicOperation
        Throws:
        java.io.IOException - error reading from log stream
        java.lang.ClassNotFoundException - log stream corrupted
      • doMe

        public void doMe​(Transaction xact,
                         LogInstant instant,
                         LimitObjectInput in)
                  throws StandardException,
                         java.io.IOException
        Description copied from interface: Loggable
        Apply the change indicated by this operation and optional data. If this method fail, the system will be shut down because the log record has already been written to disk. Moreover, the log record will be replayed during recovery and this doMe method will be called on the same page again, so if it fails again, recovery will fail and the database cannot be started. So it is very important to make sure that every resource you need, such as disk space, has been acquired before the logAndDo method is called!
        This method cannot acquire any resource (like latching of a page) since it is called underneath the logging system, ie., the log record has already been written to the log stream.

        The available() method of in indicates how much data can be read, i.e. how much was originally written.

        Parameters:
        xact - the Transaction
        instant - the log instant of this operation
        in - optional data
        Throws:
        java.io.IOException - Can be thrown by any of the methods of ObjectInput.
        StandardException - Standard Derby policy.
        See Also:
        Loggable.doMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.LimitObjectInput)
      • restoreMe

        public void restoreMe​(Transaction xact,
                              BasePage undoPage,
                              LogInstant CLRinstant,
                              LimitObjectInput in)
                       throws StandardException,
                              java.io.IOException
        restore the before image of the page
        Specified by:
        restoreMe in class PageBasicOperation
        Parameters:
        xact - the Transaction doing the rollback
        undoPage - the page to rollback changes on
        CLRinstant - the log instant of this (PageUndo) operation
        in - optional data for the rollback operation
        Throws:
        StandardException - Standard Derby Error Policy
        java.io.IOException - problem reading the complete log record from the input stream