Field Detail

• num_rows

  protected int num_rows

• destSlot

  protected int destSlot

• recordIds

  protected int[] recordIds

• reservedSpace

  protected int[] reservedSpace

• preparedLog

  protected transient ByteArray preparedLog

Constructor Detail

• CopyRowsOperation

  CopyRowsOperation​(RawTransaction t,
                    BasePage destPage,
                    BasePage srcPage,
                    int destSlot,
                    int num_rows,
                    int srcSlot,
                    int[] recordIds)
             throws StandardException

  Throws:

  StandardException

• CopyRowsOperation

  public CopyRowsOperation()

Method Detail

• 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

• getTypeFormatId

  public int getTypeFormatId()

  Return my format identifier.

  Returns:

  The identifier. (A UUID stuffed in an array of 16 bytes).

• 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 error 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)

• undoMe

  public void undoMe​(Transaction xact,
                     BasePage undoPage,
                     LogInstant CLRInstant,
                     LimitObjectInput in)
              throws StandardException,
                     java.io.IOException

  to undo this operation, purge all records that were copied over.

  Specified by:

  undoMe in class PhysicalPageOperation

  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:

  java.io.IOException - Can be thrown by any of the methods of ObjectInput.

  StandardException - Standard Derby error policy

  See Also:

  PhysicalPageOperation.undoMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.impl.store.raw.data.BasePage, 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:

  java.io.IOException - problem reading the complete log record from the input stream

  StandardException - Standard Derby Error Policy

• getPreparedLog

  public ByteArray getPreparedLog()

  Description copied from class: PageBasicOperation
  the default for optional data is set to null. If an operation has optional data, the operation need to prepare the optional data for this method. WARNING: If a log operation extends this class, and the operation has optional data, it MUST overwrite this method to return a ByteArray that contains the optional data.

  Specified by:

  getPreparedLog in interface Loggable

  Overrides:

  getPreparedLog in class PageBasicOperation

• writeOptionalDataToBuffer

  private void writeOptionalDataToBuffer​(RawTransaction t,
                                         BasePage srcPage,
                                         int srcSlot)
                                  throws StandardException,
                                         java.io.IOException

  Write the rows that are to be copied into this page

  Throws:

  java.io.IOException - Can be thrown by any of the methods of ObjectOutput.

  StandardException - Standard Derby policy.

• toString

  public java.lang.String toString()

  DEBUG: Print self.

  Overrides:

  toString in class PageBasicOperation