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public interface AllocationActions
This interface describe the operations that has to do with page allocation/deallocation. This interface is used for a special allocation page that records the allocation information and dispense the allocation policy.
Method Summary | |
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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. |
Method Detail |
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void actionAllocatePage(RawTransaction t, BasePage allocPage, long pageNumber, int doStatus, int undoStatus) throws StandardException
t
- The transactionallocPage
- the allocation pagepageNumber
- the page to allocation or deallocationdoStatus
- set the allocation status of the page this valueundoStatus
- on undo, set the allocation status of the page
this value
StandardException
- Standard Derby error policyvoid actionChainAllocPage(RawTransaction t, BasePage allocPage, long pageNumber, long pageOffset) throws StandardException
t
- The transactionallocPage
- the allocation page whose next page chain needs
to be changedpageNumber
- the next allocation page's numberpageOffset
- the next allocation page's page offset
StandardException
- Standard Derby error policyvoid actionCompressSpaceOperation(RawTransaction t, BasePage allocPage, int new_highest_page, int num_pages_truncated) throws StandardException
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.
t
- The transactionallocPage
- 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.
StandardException
- Standard exception policy.
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