com.bigdata.mdi

Interface IMetadataIndex

All Superinterfaces:

IRangeQuery

All Known Implementing Classes:

CacheOnceMetadataIndex, CachingMetadataIndex, MetadataIndex, MetadataIndexView, NoCacheMetadataIndexView

public interface IMetadataIndex
extends IRangeQuery

Interface for a metadata index. The metadata index stores the PartitionLocators that specify which IDataService has data for each index partition in a scale-out index.

Version:

$Id$

Author:

Bryan Thompson

Field Summary

Fields inherited from interface com.bigdata.btree.IRangeQuery

ALL, CURSOR, DEFAULT, DELETED, FIXED_LENGTH_SUCCESSOR, KEYS, NONE, PARALLEL, READONLY, REMOVEALL, REVERSE, VALS

Method Summary

Methods

Modifier and Type	Method and Description
PartitionLocator	find(byte[] key) Find and return the partition spanning the given key.
PartitionLocator	get(byte[] key) The partition with that separator key or null (exact match on the separator key).
MetadataIndex.MetadataIndexMetadata	getIndexMetadata() The metadata for the metadata index itself.
IndexMetadata	getScaleOutIndexMetadata() The metadata template for the scale-out index managed by this metadata index.
void	staleLocator(PartitionLocator locator) Notification that a locator is stale.

Methods inherited from interface com.bigdata.btree.IRangeQuery

rangeCount, rangeCount, rangeCountExact, rangeCountExactWithDeleted, rangeIterator, rangeIterator, rangeIterator

Method Detail

getIndexMetadata

MetadataIndex.MetadataIndexMetadata getIndexMetadata()

The metadata for the metadata index itself. Note that the MetadataIndex.MetadataIndexMetadata.getManagedIndexMetadata() returns the template IndexMetadata for the scale-out index partitions.

See Also:

getScaleOutIndexMetadata()

getScaleOutIndexMetadata

IndexMetadata getScaleOutIndexMetadata()

The metadata template for the scale-out index managed by this metadata index.

get

PartitionLocator get(byte[] key)

The partition with that separator key or null (exact match on the separator key).

Parameters:

key - The separator key (the first key that would go into that partition).

Returns:

The partition with that separator key or null.

find

PartitionLocator find(byte[] key)

Find and return the partition spanning the given key.

Parameters:

key - A key (optional). When null the locator for the last index partition will be returned.

Returns:

The partition spanning the given key or null if there are no partitions defined.

staleLocator

void staleLocator(PartitionLocator locator)

Notification that a locator is stale. Caching implementations of this interface will use this notice to update their state from the authoritative metadata index. Non-caching and authoritative implementations just ignore this message.

Parameters:

locator - The locator.