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

java.lang.Object
  extended byorg.apache.derby.impl.store.raw.data.DirectAllocActions
All Implemented Interfaces:
AllocationActions

public class DirectAllocActions
extends java.lang.Object
implements AllocationActions


Constructor Summary
DirectAllocActions()
           
 
Method Summary
 void actionAllocatePage(RawTransaction t, BasePage allocPage, long pageNumber, int doStatus, int undoStatus)
          Set the allocation status of pageNumber to doStatus.
 void actionChainAllocPage(RawTransaction t, BasePage allocPage, long pageNumber, long pageOffset)
          Chain one allocation page to the next.
 void actionCompressSpaceOperation(RawTransaction t, BasePage allocPage, int new_highest_page, int num_pages_truncated)
          Compress free pages.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DirectAllocActions

public DirectAllocActions()
Method Detail

actionAllocatePage

public void actionAllocatePage(RawTransaction t,
                               BasePage allocPage,
                               long pageNumber,
                               int doStatus,
                               int undoStatus)
                        throws StandardException
Set the allocation status of pageNumber to doStatus. To undo this operation, set the allocation status of pageNumber to undoStatus

Specified by:
actionAllocatePage in interface AllocationActions
Parameters:
t - The transaction
allocPage - the allocation page
pageNumber - the page to allocation or deallocation
doStatus - set the allocation status of the page this value
undoStatus - on undo, set the allocation status of the page this value
Throws:
StandardException - Standard Cloudscape error policy

actionChainAllocPage

public void actionChainAllocPage(RawTransaction t,
                                 BasePage allocPage,
                                 long pageNumber,
                                 long pageOffset)
                          throws StandardException
Chain one allocation page to the next.

Specified by:
actionChainAllocPage in interface AllocationActions
Parameters:
t - The transaction
allocPage - the allocation page whose next page chain needs to be changed
pageNumber - the next allocation page's number
pageOffset - the next allocation page's page offset
Throws:
StandardException - Standard Cloudscape error policy

actionCompressSpaceOperation

public void actionCompressSpaceOperation(RawTransaction t,
                                         BasePage allocPage,
                                         int new_highest_page,
                                         int num_pages_truncated)
                                  throws StandardException
Compress free pages.

Compress the free pages at the end of the range maintained by this allocation page. All pages being compressed should be FREE. Only pages in the last allocation page can be compressed.

Specified by:
actionCompressSpaceOperation in interface AllocationActions
Parameters:
t - The transaction
allocPage - the allocation page to do compress on.
new_highest_page - The new highest page on this allocation page. The number is the offset of the page in the array of pages maintained by this allocation page, for instance a value of 0 indicates all page except the first one are to be truncated. If all pages are truncated then the offset is set to -1.
num_pages_truncated - The number of allocated pages in this allocation page prior to the truncate. Note that all pages from NewHighestPage+1 through newHighestPage+num_pages_truncated should be FREE.
Throws:
StandardException - Standard exception policy.

Built on Tue 2006-10-10 19:23:47+0200, from revision exported

Apache Derby V10.1 Engine Documentation - Copyright © 1997,2005 The Apache Software Foundation or its licensors, as applicable.