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

• toString

  public java.lang.String toString()

  DEBUG: Print self.

  Overrides:

  toString in class PageBasicOperation