org.apache.ignite.internal.processors.cache.database

Class MetadataStorage

java.lang.Object

org.apache.ignite.internal.processors.cache.database.MetadataStorage

All Implemented Interfaces:

MetaStore

public class MetadataStorage
extends Object
implements MetaStore

Metadata storage.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MetadataStorage.MetaStoreInnerIO
static class	MetadataStorage.MetaStoreLeafIO

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_IDX_NAME_LEN Max index name length (bytes num)

Constructor Summary

Constructors

Constructor and Description
MetadataStorage(PageMemory pageMem, IgniteWriteAheadLogManager wal, AtomicLong globalRmvId, int cacheId, int allocPartId, byte allocSpace, ReuseList reuseList, long rootPageId, boolean initNew)

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Destroy this meta store.
RootPage	dropRootPage(String idxName) Deallocate index page and remove from tree.
RootPage	getOrAllocateForTree(String idxName) Get or allocate initial page for an index.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_IDX_NAME_LEN

public static final int MAX_IDX_NAME_LEN

Max index name length (bytes num)

See Also:

Constant Field Values

Constructor Detail

MetadataStorage

public MetadataStorage(PageMemory pageMem,
               IgniteWriteAheadLogManager wal,
               AtomicLong globalRmvId,
               int cacheId,
               int allocPartId,
               byte allocSpace,
               ReuseList reuseList,
               long rootPageId,
               boolean initNew)

Parameters:

pageMem - Page memory.

wal - Write ahead log manager.

Method Detail

getOrAllocateForTree

public RootPage getOrAllocateForTree(String idxName)
                              throws IgniteCheckedException

Get or allocate initial page for an index.

Specified by:

getOrAllocateForTree in interface MetaStore

Parameters:

idxName - Index name.

Returns:

RootPage that keeps pageId, allocated flag that shows whether the page was newly allocated, and rootId that is counter which increments each time new page allocated.

Throws:

IgniteCheckedException

dropRootPage

public RootPage dropRootPage(String idxName)
                      throws IgniteCheckedException

Deallocate index page and remove from tree.

Specified by:

dropRootPage in interface MetaStore

Parameters:

idxName - Index name.

Returns:

Root ID or -1 if no page was removed.

Throws:

IgniteCheckedException

destroy

public void destroy()
             throws IgniteCheckedException

Destroy this meta store.

Specified by:

destroy in interface MetaStore

Throws:

IgniteCheckedException