com.hazelcast.query.impl

Class Indexes

java.lang.Object

com.hazelcast.query.impl.Indexes

public class Indexes
extends Object

Contains all indexes for a data-structure, e.g. an IMap.

Constructor Summary

Constructors

Constructor and Description
Indexes(InternalSerializationService serializationService, IndexProvider indexProvider, Extractors extractors, boolean global, IndexCopyBehavior copyBehavior)

Method Summary

Modifier and Type	Method and Description
Index	addOrGetIndex(String attribute, boolean ordered)
void	clearContents() Clears contents of indexes managed by this instance.
void	clearIndexes()
Index	destroyIndex(String attribute)
Index	getIndex(String attribute) Get index for a given attribute.
Index[]	getIndexes()
boolean	hasIndex()
boolean	isGlobal()
Set<QueryableEntry>	query(Predicate predicate)
void	removeEntryIndex(Data key, Object value)
void	saveEntryIndex(QueryableEntry queryableEntry, Object oldValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

Indexes

public Indexes(InternalSerializationService serializationService,
               IndexProvider indexProvider,
               Extractors extractors,
               boolean global,
               IndexCopyBehavior copyBehavior)

Method Detail

destroyIndex

public Index destroyIndex(String attribute)

addOrGetIndex

public Index addOrGetIndex(String attribute,
                           boolean ordered)

getIndexes

public Index[] getIndexes()

clearIndexes

public void clearIndexes()

clearContents

public void clearContents()

Clears contents of indexes managed by this instance.

removeEntryIndex

public void removeEntryIndex(Data key,
                             Object value)
                      throws QueryException

Throws:

QueryException

hasIndex

public boolean hasIndex()

saveEntryIndex

public void saveEntryIndex(QueryableEntry queryableEntry,
                           Object oldValue)
                    throws QueryException

Throws:

QueryException

isGlobal

public boolean isGlobal()

Returns:

true if the index is global-per map, meaning there is just a single instance of this object per map. Global indexes are used in on-heap maps, since they give a significant performance boost. The opposite of global indexes are partitioned-indexes which are stored locally per partition. In case of a partitioned-index, each query has to query the index in each partition separately, which all-together may be around 3 times slower than querying a single global index.

getIndex

public Index getIndex(String attribute)

Get index for a given attribute. If the index does not exist then returns null.

Parameters:

attribute -

Returns:

Index for attribute or null if the index does not exist.

query

public Set<QueryableEntry> query(Predicate predicate)