org.apache.ignite.internal.processors.cache.persistence.pagemem

Interface PageReadWriteManager

All Known Subinterfaces:

IgnitePageStoreManager

All Known Implementing Classes:

DefragmentationPageReadWriteManager, FilePageStoreManager, PageReadWriteManagerImpl

public interface PageReadWriteManager

Method Summary

Modifier and Type	Method and Description
long	allocatePage(int grpId, int partId, byte flags) Allocates a page for the given page space.
void	read(int grpId, long pageId, ByteBuffer pageBuf, boolean keepCrc) Reads a page for the given cache ID.
PageStore	write(int grpId, long pageId, ByteBuffer pageBuf, int tag, boolean calculateCrc) Writes the page for the given cache ID.

Method Detail

read

void read(int grpId,
          long pageId,
          ByteBuffer pageBuf,
          boolean keepCrc)
   throws IgniteCheckedException

Reads a page for the given cache ID. Cache ID may be 0 if the page is a meta page.

Parameters:

grpId - Cache group ID.

pageId - PageID to read.

pageBuf - Page buffer to write to.

keepCrc - Keep CRC flag.

Throws:

IgniteCheckedException - If failed to read the page.

write

PageStore write(int grpId,
                long pageId,
                ByteBuffer pageBuf,
                int tag,
                boolean calculateCrc)
         throws IgniteCheckedException

Writes the page for the given cache ID. Cache ID may be 0 if the page is a meta page.

Parameters:

grpId - Cache group ID.

pageId - Page ID.

pageBuf - Page buffer to write.

Throws:

IgniteCheckedException - If failed to write page.

allocatePage

long allocatePage(int grpId,
                  int partId,
                  byte flags)
           throws IgniteCheckedException

Allocates a page for the given page space.

Parameters:

grpId - Cache group ID.

partId - Partition ID. Used only if flags is equal to PageIdAllocator.FLAG_DATA.

flags - Page allocation flags.

Returns:

Allocated page ID.

Throws:

IgniteCheckedException - If IO exception occurred while allocating a page ID.