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org.apache.derby.impl.store.raw.data
Class UpdateOperation  

java.lang.Object
  org.apache.derby.impl.store.raw.data.PageBasicOperation
      org.apache.derby.impl.store.raw.data.PhysicalPageOperation
          org.apache.derby.impl.store.raw.data.UpdateOperation

All Implemented Interfaces:

java.io.Externalizable, org.apache.derby.iapi.services.io.Formatable, org.apache.derby.iapi.store.raw.Loggable, org.apache.derby.iapi.store.raw.RePreparable, java.io.Serializable, org.apache.derby.iapi.services.io.TypedFormat, org.apache.derby.iapi.store.raw.Undoable

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public final class UpdateOperation

extends PhysicalPageOperation

Represents the update of a particular row on a page.

Field Summary



protected  int
doMeSlot



           



protected  int
nextColumn



           



protected  org.apache.derby.iapi.util.ByteArray
preparedLog



           



protected  int
recordId



           


 


Fields inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation


containerHdl, foundHere, page


 


Fields inherited from interface org.apache.derby.iapi.store.raw.Loggable


ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK


 






Constructor Summary


UpdateOperation()



           


UpdateOperation(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                BasePage page,
                int slot,
                int recordId,
                java.lang.Object[] row,
                org.apache.derby.iapi.services.io.FormatableBitSet validColumns,
                int realStartColumn,
                org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream logBuffer,
                int realSpaceOnPage,
                org.apache.derby.iapi.store.raw.RecordHandle headRowHandle)



           


 






Method Summary



 void
doMe(org.apache.derby.iapi.store.raw.Transaction xact,
     org.apache.derby.iapi.store.raw.log.LogInstant instant,
     org.apache.derby.iapi.services.io.LimitObjectInput in)



          Store the new record directly over the old record, the implementation
                of storeRecord is responsible for removing any old data.



 int
getNextStartColumn()



          Return the last column of the row this operation logged



 org.apache.derby.iapi.util.ByteArray
getPreparedLog()



          The log operations are responsible to create the ByteArray, and the log
                operations should write out any optional data for the change to the 
        ByteArray.



 int
getTypeFormatId()



          Return my format identifier.



 void
readExternal(java.io.ObjectInput in)



          Read this in



 void
restoreMe(org.apache.derby.iapi.store.raw.Transaction xact,
          BasePage undoPage,
          org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
          org.apache.derby.iapi.services.io.LimitObjectInput in)



          restore the before image of the page



 java.lang.String
toString()



          Convert this Object to a human-readable String.



 void
undoMe(org.apache.derby.iapi.store.raw.Transaction xact,
       BasePage undoPage,
       org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
       org.apache.derby.iapi.services.io.LimitObjectInput in)



          Store the old record directly over the new record, the implementation
                of storeRecord is responsible for removing any new data.



 void
writeExternal(java.io.ObjectOutput out)



          This method is responsible for writing the instance data of an object
 to the passed in stream.



private  void
writeOptionalDataToBuffer(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                          org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream logBuffer,
                          java.lang.Object[] row,
                          org.apache.derby.iapi.services.io.FormatableBitSet validColumns,
                          int realStartColumn,
                          int realSpaceOnPage,
                          org.apache.derby.iapi.store.raw.RecordHandle headRowHandle)



          Write out the changed colums of new record (from the row) followed by 
        changed columns of the old record (from the page).


 


Methods inherited from class org.apache.derby.impl.store.raw.data.PhysicalPageOperation


generateUndo


 


Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation


findpage, getPage, getPageForLoadTran, getPageId, getPageVersion, group, needsRedo, reclaimPrepareLocks, releaseResource, resetPageNumber


 


Methods inherited from class java.lang.Object


clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait


 


Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable


group, needsRedo, releaseResource


 








Field Detail




doMeSlot
protected int doMeSlot







recordId
protected int recordId







nextColumn
protected transient int nextColumn







preparedLog
protected transient org.apache.derby.iapi.util.ByteArray preparedLog











Constructor Detail




UpdateOperation
public UpdateOperation(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                       BasePage page,
                       int slot,
                       int recordId,
                       java.lang.Object[] row,
                       org.apache.derby.iapi.services.io.FormatableBitSet validColumns,
                       int realStartColumn,
                       org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream logBuffer,
                       int realSpaceOnPage,
                       org.apache.derby.iapi.store.raw.RecordHandle headRowHandle)
                throws org.apache.derby.iapi.error.StandardException





UpdateOperation
public UpdateOperation()









Method Detail




writeExternal
public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Description copied from interface: java.io.Externalizable
This method is responsible for writing the instance data of an object
 to the passed in stream.  Note that this stream is not a subclass of
 OutputStream, but rather is a class that implements the
 ObjectOutput interface.  That interface provides a 
 number of methods
 for writing Java data values to a stream.
 

 Not that the implementation of this method must be coordinated with
 the implementation of readExternal.


Specified by:
writeExternal in interface java.io.Externalizable
Overrides:
writeExternal in class PageBasicOperation








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








getTypeFormatId
public int getTypeFormatId()

Return my format identifier.








getNextStartColumn
public int getNextStartColumn()

Return the last column of the row this operation logged








doMe
public void doMe(org.apache.derby.iapi.store.raw.Transaction xact,
                 org.apache.derby.iapi.store.raw.log.LogInstant instant,
                 org.apache.derby.iapi.services.io.LimitObjectInput in)
          throws org.apache.derby.iapi.error.StandardException,
                 java.io.IOException

Store the new record directly over the old record, the implementation
                of storeRecord is responsible for removing any old data.








undoMe
public void undoMe(org.apache.derby.iapi.store.raw.Transaction xact,
                   BasePage undoPage,
                   org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
                   org.apache.derby.iapi.services.io.LimitObjectInput in)
            throws org.apache.derby.iapi.error.StandardException,
                   java.io.IOException

Store the old record directly over the new record, the implementation
                of storeRecord is responsible for removing any new data.


Specified by:
undoMe in class PhysicalPageOperation








getPreparedLog
public org.apache.derby.iapi.util.ByteArray getPreparedLog()

Description copied from interface: org.apache.derby.iapi.store.raw.Loggable
The log operations are responsible to create the ByteArray, and the log
                operations should write out any optional data for the change to the 
        ByteArray.
                The ByteArray can be prepared when the log operation is constructed,
                or it can be prepared when getPreparedLog() is called.

                Called by the log manager to allow the log operation to pass the buffer
                which contains optional data that will be available in to doMe() 
        methods.


Specified by:
getPreparedLog in interface org.apache.derby.iapi.store.raw.Loggable
Overrides:
getPreparedLog in class PageBasicOperation








writeOptionalDataToBuffer
private void writeOptionalDataToBuffer(org.apache.derby.iapi.store.raw.xact.RawTransaction t,
                                       org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream logBuffer,
                                       java.lang.Object[] row,
                                       org.apache.derby.iapi.services.io.FormatableBitSet validColumns,
                                       int realStartColumn,
                                       int realSpaceOnPage,
                                       org.apache.derby.iapi.store.raw.RecordHandle headRowHandle)
                                throws org.apache.derby.iapi.error.StandardException,
                                       java.io.IOException

Write out the changed colums of new record (from the row) followed by 
        changed columns of the old record (from the page).








restoreMe
public void restoreMe(org.apache.derby.iapi.store.raw.Transaction xact,
                      BasePage undoPage,
                      org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
                      org.apache.derby.iapi.services.io.LimitObjectInput in)
               throws org.apache.derby.iapi.error.StandardException,
                      java.io.IOException

restore the before image of the page


Specified by:
restoreMe in class PageBasicOperation








toString
public java.lang.String toString()

Description copied from class: java.lang.Object
Convert this Object to a human-readable String.
 There are no limits placed on how long this String
 should be or what it should contain.  We suggest you
 make it as intuitive as possible to be able to place
 it into System.out.println() 55 
 and such.

 
It is typical, but not required, to ensure that this method
 never completes abruptly with a java.lang.RuntimeException.

 
This method will be called when performing string
 concatenation with this object.  If the result is
 null, string concatenation will instead
 use "null".

 
The default implementation returns
 getClass().getName() + "@" +
      Integer.toHexString(hashCode()).


Overrides:
toString in class PageBasicOperation














  

  
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