Package step.core.accessors

Class CachedAccessor<T extends step.core.accessors.AbstractIdentifiableObject>

java.lang.Object

step.core.accessors.CachedAccessor<T>

Type Parameters:

T - the type of the entity

All Implemented Interfaces:

Accessor<T>

public class CachedAccessor<T extends step.core.accessors.AbstractIdentifiableObject>
extends Object
implements Accessor<T>

This Accessor loads all the entities of the provided underlying Accessor at initialization and keeps them in memory for further accesses. Write operations like remove and save are persisted in the underlying Accessor

Constructor Summary

Constructors

Constructor	Description
CachedAccessor(Accessor<T> underlyingAccessor)

Method Summary

Modifier and Type	Method	Description
T	findByAttributes(Map<String,String> attributes)	Find an object by default attributes.
T	findByAttributes(Map<String,String> attributes, String attributesMapKey)	Find an object by attributes.
T	findByCriteria(Map<String,String> criteria)	Find an object by criteria.
Spliterator<T>	findManyByAttributes(Map<String,String> attributes)	Find objects by attributes.
Spliterator<T>	findManyByAttributes(Map<String,String> attributes, String attributesMapKey)	Find objects by attributes.
Stream<T>	findManyByCriteria(Map<String,String> criteria)	Find objects by criteria.
T	get(String id)	Get an object by id
T	get(org.bson.types.ObjectId id)	Get an object by id
Iterator<T>	getAll()
List<T>	getRange(int skip, int limit)	Get the range of objects specified by the skip/limit parameters browsing the collection sorted by ID in the descending order
void	reloadCache()	Reloads all the entities from the underlying Accessor
void	remove(org.bson.types.ObjectId id)	Remove an entity.
void	save(Iterable<T> entities)	Save a list of entities.
T	save(T entity)	Save an entity.
Stream<T>	stream()

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedAccessor

public CachedAccessor(Accessor<T> underlyingAccessor)

Parameters:

underlyingAccessor - the Accessor from which the entities should be loaded

Method Detail

reloadCache

public void reloadCache()

Reloads all the entities from the underlying Accessor

get

public T get(org.bson.types.ObjectId id)

Description copied from interface: Accessor

Get an object by id

Specified by:

get in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

id - the UID of the object

Returns:

the object

get

public T get(String id)

Description copied from interface: Accessor

Get an object by id

Specified by:

get in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

id - the UID of the object

Returns:

the object

findByCriteria

public T findByCriteria(Map<String,String> criteria)

Description copied from interface: Accessor

Find an object by criteria. If multiple objects match these criteria, the first one will be returned

Specified by:

findByCriteria in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

criteria - the map of mandatory criteria of the object to be found

Returns:

the object

findManyByCriteria

public Stream<T> findManyByCriteria(Map<String,String> criteria)

Description copied from interface: Accessor

Find objects by criteria.

Specified by:

findManyByCriteria in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

criteria - the map of mandatory criteria of the object to be found

Returns:

an Iterator for the objects found

findByAttributes

public T findByAttributes(Map<String,String> attributes)

Description copied from interface: Accessor

Find an object by default attributes. If multiple objects match these attributes, the first one will be returned

Specified by:

findByAttributes in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

attributes - the map of mandatory attributes of the object to be found

Returns:

the object

findManyByAttributes

public Spliterator<T> findManyByAttributes(Map<String,String> attributes)

Description copied from interface: Accessor

Find objects by attributes.

Specified by:

findManyByAttributes in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

attributes - the map of mandatory attributes of the object to be found

Returns:

an Iterator for the objects found

findByAttributes

public T findByAttributes(Map<String,String> attributes,
                          String attributesMapKey)

Description copied from interface: Accessor

Find an object by attributes. If multiple objects match these attributes, the first one will be returned

Specified by:

findByAttributes in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

attributes - the map of mandatory attributes of the object to be found

attributesMapKey - the string representing the name (or "key") of the attribute map

Returns:

the object

findManyByAttributes

public Spliterator<T> findManyByAttributes(Map<String,String> attributes,
                                           String attributesMapKey)

Description copied from interface: Accessor

Find objects by attributes.

Specified by:

findManyByAttributes in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

attributes - the map of mandatory attributes of the object to be found

attributesMapKey - the string representing the name (or "key") of the attribute map

Returns:

an Iterator for the objects found

getAll

public Iterator<T> getAll()

Specified by:

getAll in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

remove

public void remove(org.bson.types.ObjectId id)

Description copied from interface: Accessor

Remove an entity.

Specified by:

remove in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

id - id the entity

save

public T save(T entity)

Description copied from interface: Accessor

Save an entity. If an entity with the same id exists, it will be updated otherwise inserted.

Specified by:

save in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

entity - the entity instance to be saved

Returns:

the saved entity

save

public void save(Iterable<T> entities)

Description copied from interface: Accessor

Save a list of entities.

Specified by:

save in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

entities - the list of entities to be saved

getRange

public List<T> getRange(int skip,
                        int limit)

Description copied from interface: Accessor

Get the range of objects specified by the skip/limit parameters browsing the collection sorted by ID in the descending order

Specified by:

getRange in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Parameters:

skip - the start index (inclusive) of the range

limit - the size of the range

Returns:

a List containing the objects of the specified range

stream

public Stream<T> stream()

Specified by:

stream in interface Accessor<T extends step.core.accessors.AbstractIdentifiableObject>

Returns:

a Stream with all objects