org.apache.ignite.internal.pagemem

Interface PageSupport

All Known Subinterfaces:

PageMemory, PageMemoryEx

All Known Implementing Classes:

PageMemoryImpl, PageMemoryNoStoreImpl

public interface PageSupport

Supports operations on pages.

Method Summary

Modifier and Type	Method and Description
long	acquirePage(int grpId, long pageId) Gets the page absolute pointer associated with the given page ID.
boolean	isDirty(int grpId, long pageId, long page)
long	readLock(int grpId, long pageId, long page)
long	readLockForce(int grpId, long pageId, long page) Obtains read lock without checking page tag.
void	readUnlock(int grpId, long pageId, long page) Releases locked page.
void	releasePage(int grpId, long pageId, long page)
long	tryWriteLock(int grpId, long pageId, long page)
long	writeLock(int grpId, long pageId, long page)
void	writeUnlock(int grpId, long pageId, long page, Boolean walPlc, boolean dirtyFlag) Releases locked page.

Method Detail

acquirePage

long acquirePage(int grpId,
                 long pageId)
          throws IgniteCheckedException

Gets the page absolute pointer associated with the given page ID. Each page obtained with this method must be released by calling releasePage(int, long, long). This method will allocate page with given ID if it doesn't exist.

Parameters:

grpId - Cache group ID.

pageId - Page ID.

Returns:

Page pointer.

Throws:

IgniteCheckedException - If failed.

releasePage

void releasePage(int grpId,
                 long pageId,
                 long page)

Parameters:

grpId - Cache group ID.

pageId - Page ID to release.

page - Page pointer.

readLock

long readLock(int grpId,
              long pageId,
              long page)

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

Returns:

Pointer for reading the page.

readLockForce

long readLockForce(int grpId,
                   long pageId,
                   long page)

Obtains read lock without checking page tag.

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

Returns:

Pointer for reading the page.

readUnlock

void readUnlock(int grpId,
                long pageId,
                long page)

Releases locked page.

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

writeLock

long writeLock(int grpId,
               long pageId,
               long page)

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

Returns:

Address of a buffer with contents of the given page or 0L if attempt to take the write lock failed.

tryWriteLock

long tryWriteLock(int grpId,
                  long pageId,
                  long page)

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

Returns:

Address of a buffer with contents of the given page or 0L if attempt to take the write lock failed.

writeUnlock

void writeUnlock(int grpId,
                 long pageId,
                 long page,
                 Boolean walPlc,
                 boolean dirtyFlag)

Releases locked page.

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

walPlc - True if page should be recorded to WAL, false if the page must not be recorded and null for the default behavior.

dirtyFlag - Determines whether the page was modified since the last checkpoint.

isDirty

boolean isDirty(int grpId,
                long pageId,
                long page)

Parameters:

grpId - Cache group ID.

pageId - Page ID.

page - Page pointer.

Returns:

True if the page is dirty.