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java.lang.Objectorg.h2.util.CacheObject
org.h2.store.Page
org.h2.store.PageFreeList
public class PageFreeList
The list of free pages of a page store. The format of a free list trunk page is:
Field Summary |
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Fields inherited from class org.h2.store.Page |
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changeCount, FLAG_LAST, TYPE_BTREE_LEAF, TYPE_BTREE_NODE, TYPE_DATA_LEAF, TYPE_DATA_NODE, TYPE_DATA_OVERFLOW, TYPE_EMPTY, TYPE_FREE_LIST, TYPE_STREAM_DATA, TYPE_STREAM_TRUNK |
Fields inherited from class org.h2.util.CacheObject |
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cacheChained, cacheNext, cachePrevious |
Method Summary | |
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boolean |
canMove()
If this page can be moved. |
boolean |
canRemove()
Check if the object can be removed from the cache. |
int |
getMemory()
Get the estimated memory size. |
static int |
getPagesAddressed(int pageSize)
Get the number of pages that can fit in a free list. |
void |
moveTo(Session session,
int newPos)
Copy the data to a new location, change the parent to point to the new location, and free up the current page. |
java.lang.String |
toString()
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void |
write()
Write the page. |
Methods inherited from class org.h2.store.Page |
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add, insert, insert, insert, remove, remove, remove |
Methods inherited from class org.h2.util.CacheObject |
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compareTo, getPos, isChanged, setChanged, setPos |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Method Detail |
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public void write()
Page
write
in class Page
public static int getPagesAddressed(int pageSize)
pageSize
- the page size
public int getMemory()
getMemory
in class CacheObject
public void moveTo(Session session, int newPos)
Page
moveTo
in class Page
session
- the sessionnewPos
- the new positionpublic java.lang.String toString()
toString
in class java.lang.Object
public boolean canRemove()
CacheObject
canRemove
in class CacheObject
public boolean canMove()
Page
canMove
in class Page
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