fr.inria.atlanmod.neoemf.data.mapdb.store

Class DirectWriteMapDbIndicesStore

java.lang.Object

fr.inria.atlanmod.neoemf.data.store.AbstractPersistentStore

fr.inria.atlanmod.neoemf.data.store.AbstractDirectWriteStore<MapDbPersistenceBackend>

fr.inria.atlanmod.neoemf.data.mapdb.store.DirectWriteMapDbStore

fr.inria.atlanmod.neoemf.data.mapdb.store.DirectWriteMapDbIndicesStore

All Implemented Interfaces:

DirectWriteStore, PersistentStore, InternalEObject.EStore

public class DirectWriteMapDbIndicesStore
extends DirectWriteMapDbStore

A DirectWriteMapDbStore that persists Collection indices instead of serialized arrays.

Indices are persisted with dedicated FeatureKeys containing the index of the element to store. Using this approach avoid to deserialize entire Collections to retrieve a single element, which can be an important bottleneck in terms of execution time and memory consumption if the underlying model contains very large Collections.

This class re-implements EStructuralFeature accessors and mutators as well as Collection operations such as size, clear, or indexOf.

This store can be used as a base store that can be complemented by plugging decorator stores on top of it (see AbstractPersistentStoreDecorator subclasses) to provide additional features such as caching or logging.

See Also:

DirectWriteMapDbStore, MapDbPersistenceBackend, AbstractPersistentStoreDecorator

Field Summary

Fields inherited from class fr.inria.atlanmod.neoemf.data.mapdb.store.DirectWriteMapDbStore

DEFAULT_CACHE_SIZE, persistentObjectsCache

Fields inherited from class fr.inria.atlanmod.neoemf.data.store.AbstractDirectWriteStore

backend

Fields inherited from interface fr.inria.atlanmod.neoemf.data.store.PersistentStore

NO_INDEX

Constructor Summary

Constructors

Constructor and Description
DirectWriteMapDbIndicesStore(Resource.Internal resource, MapDbPersistenceBackend backend) Constructs a new DirectWriteMapDbIndicesStore between the given resource and the backend.

Method Summary

Modifier and Type	Method and Description
void	add(InternalEObject internalObject, EStructuralFeature feature, int index, Object value) Adds the value at the index in the content of the object's feature.
void	clear(InternalEObject internalObject, EStructuralFeature feature) Removes all values form the content of the object's feature
protected Object	getAttribute(PersistentEObject object, EAttribute attribute, int index) Returns the value at the index in the content of the attribute of the object.
protected Object	getReference(PersistentEObject object, EReference reference, int index) Returns the value at the index in the content of the reference of the object.
int	indexOf(InternalEObject internalObject, EStructuralFeature feature, Object value) Returns the first index of the given value in the content of the object's feature.
int	lastIndexOf(InternalEObject internalObject, EStructuralFeature feature, Object value) Returns the last index of the given value in the content of the object's feature.
Object	remove(InternalEObject internalObject, EStructuralFeature feature, int index) Removes the value at the index in the content of the object's feature.
protected Object	setAttribute(PersistentEObject object, EAttribute attribute, int index, Object value) Sets the value at the index in the content of the attribute of the object.
protected Object	setReference(PersistentEObject object, EReference reference, int index, PersistentEObject value) Sets the value at the index in the content of the reference of the object.
int	size(InternalEObject internalObject, EStructuralFeature feature) Returns the number of values in the content of the object's feature.

Methods inherited from class fr.inria.atlanmod.neoemf.data.mapdb.store.DirectWriteMapDbStore

addAttribute, addReference, contains, eObject, getContainer, getContainingFeature, getFromMap, getFromMap, isSet, removeAttribute, removeReference, unset, updateContainment, updateInstanceOf

Methods inherited from class fr.inria.atlanmod.neoemf.data.store.AbstractDirectWriteStore

clearAttribute, clearReference, containsAttribute, containsReference, create, get, hashCode, indexOfAttribute, indexOfReference, isEmpty, isSetAttribute, isSetReference, lastIndexOfAttribute, lastIndexOfReference, move, parseProperty, resource, save, serializeToProperty, set, toArray, toArray, unsetAttribute, unsetReference

Methods inherited from class java.lang.Object

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

Methods inherited from interface fr.inria.atlanmod.neoemf.data.store.PersistentStore

getAllInstances

Constructor Detail

DirectWriteMapDbIndicesStore

public DirectWriteMapDbIndicesStore(Resource.Internal resource,
                                    MapDbPersistenceBackend backend)

Constructs a new DirectWriteMapDbIndicesStore between the given resource and the backend.

Parameters:

resource - the resource to persist and access

backend - the persistence back-end used to store the model

Method Detail

add

public void add(InternalEObject internalObject,
                EStructuralFeature feature,
                int index,
                Object value)

Description copied from class: AbstractDirectWriteStore

Adds the value at the index in the content of the object's feature.

By default, calls the associated methods depending on the type of the feature.

Specified by:

add in interface InternalEObject.EStore

Overrides:

add in class AbstractDirectWriteStore<MapDbPersistenceBackend>

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

index - an index within the content.

value - the value to add.

See Also:

AbstractDirectWriteStore.addAttribute(PersistentEObject, EAttribute, int, Object), AbstractDirectWriteStore.addReference(PersistentEObject, EReference, int, PersistentEObject)

remove

public Object remove(InternalEObject internalObject,
                     EStructuralFeature feature,
                     int index)

Description copied from class: AbstractDirectWriteStore

Removes the value at the index in the content of the object's feature.

By default, calls the associated methods depending on the type of the feature.

Specified by:

remove in interface InternalEObject.EStore

Overrides:

remove in class AbstractDirectWriteStore<MapDbPersistenceBackend>

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

index - the index within the feature's content of the value to remove.

Returns:

the removed value.

See Also:

AbstractDirectWriteStore.removeAttribute(PersistentEObject, EAttribute, int), AbstractDirectWriteStore.removeReference(PersistentEObject, EReference, int)

indexOf

public int indexOf(InternalEObject internalObject,
                   EStructuralFeature feature,
                   Object value)

Description copied from class: AbstractDirectWriteStore

Returns the first index of the given value in the content of the object's feature.

By default, calls the associated methods depending on the type of the feature.

Specified by:

indexOf in interface InternalEObject.EStore

Overrides:

indexOf in class DirectWriteMapDbStore

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

value - the value in question.

Returns:

the first index of the given value in the content of the object's feature.

See Also:

AbstractDirectWriteStore.indexOfAttribute(PersistentEObject, EAttribute, Object), AbstractDirectWriteStore.indexOfReference(PersistentEObject, EReference, PersistentEObject)

lastIndexOf

public int lastIndexOf(InternalEObject internalObject,
                       EStructuralFeature feature,
                       Object value)

Description copied from class: AbstractDirectWriteStore

Returns the last index of the given value in the content of the object's feature.

By default, calls the associated methods depending on the type of the feature.

Specified by:

lastIndexOf in interface InternalEObject.EStore

Overrides:

lastIndexOf in class DirectWriteMapDbStore

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

value - the value in question.

Returns:

the last index of the given value in the content of the object's feature.

See Also:

AbstractDirectWriteStore.lastIndexOfAttribute(PersistentEObject, EAttribute, Object), AbstractDirectWriteStore.lastIndexOfReference(PersistentEObject, EReference, PersistentEObject)

clear

public void clear(InternalEObject internalObject,
                  EStructuralFeature feature)

Description copied from class: AbstractDirectWriteStore

Removes all values form the content of the object's feature

By default, calls the associated methods depending on the type of the feature.

Specified by:

clear in interface InternalEObject.EStore

Overrides:

clear in class DirectWriteMapDbStore

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

See Also:

AbstractDirectWriteStore.clearAttribute(PersistentEObject, EAttribute), AbstractDirectWriteStore.clearReference(PersistentEObject, EReference)

getAttribute

protected Object getAttribute(PersistentEObject object,
                              EAttribute attribute,
                              int index)

Description copied from class: AbstractDirectWriteStore

Returns the value at the index in the content of the attribute of the object.

Overrides:

getAttribute in class DirectWriteMapDbStore

Parameters:

object - the object

attribute - an attribute of the object

index - an index within the content or PersistentStore.NO_INDEX

Returns:

the value

See Also:

AbstractDirectWriteStore.get(InternalEObject, EStructuralFeature, int)

getReference

protected Object getReference(PersistentEObject object,
                              EReference reference,
                              int index)

Description copied from class: AbstractDirectWriteStore

Returns the value at the index in the content of the reference of the object.

Overrides:

getReference in class DirectWriteMapDbStore

Parameters:

object - the object

reference - a reference of the object

index - an index within the content or PersistentStore.NO_INDEX

Returns:

the value

See Also:

AbstractDirectWriteStore.get(InternalEObject, EStructuralFeature, int)

setAttribute

protected Object setAttribute(PersistentEObject object,
                              EAttribute attribute,
                              int index,
                              Object value)

Description copied from class: AbstractDirectWriteStore

Sets the value at the index in the content of the attribute of the object.

Overrides:

setAttribute in class DirectWriteMapDbStore

Parameters:

object - the object

attribute - an attribute of the object

index - an index within the content or PersistentStore.NO_INDEX

value - the new value

Returns:

the previous value

See Also:

AbstractDirectWriteStore.set(InternalEObject, EStructuralFeature, int, Object)

setReference

protected Object setReference(PersistentEObject object,
                              EReference reference,
                              int index,
                              PersistentEObject value)

Description copied from class: AbstractDirectWriteStore

Sets the value at the index in the content of the reference of the object.

Overrides:

setReference in class DirectWriteMapDbStore

Parameters:

object - the object

reference - a reference of the object

index - an index within the content or PersistentStore.NO_INDEX

value - the new value

Returns:

the previous value

See Also:

AbstractDirectWriteStore.set(InternalEObject, EStructuralFeature, int, Object)

size

public int size(InternalEObject internalObject,
                EStructuralFeature feature)

Description copied from interface: org.eclipse.emf.ecore.InternalEObject.EStore

Returns the number of values in the content of the object's feature.

Specified by:

size in interface InternalEObject.EStore

Overrides:

size in class DirectWriteMapDbStore

Parameters:

internalObject - the object in question.

feature - a many-valued feature of the object.

Returns:

the number of values in the content of the object's feature.