org.keycloak.models.map.storage

Interface MapStorage<K,V extends AbstractEntity<K>,M>

Type Parameters:

K - Type of the primary key. Various storages can

V - Type of the stored values that contains all the data stripped of session state. In other words, in the entities there are only IDs and mostly primitive types / String, never references to *Model instances. See the Abstract*Entity classes in this module.

M - Type of the *Model corresponding to the stored value, e.g. UserModel. This is used for filtering via model fields in ModelCriteriaBuilder which is necessary to abstract from physical layout and thus to support no-downtime upgrade.

All Known Implementing Classes:

ConcurrentHashMapStorage, UserSessionConcurrentHashMapStorage

public interface MapStorage<K,V extends AbstractEntity<K>,M>

Implementation of this interface interacts with a persistence storage storing various entities, e.g. users, realms. It contains basic object CRUD operations as well as bulk read(org.keycloak.models.map.storage.ModelCriteriaBuilder) and bulk delete(org.keycloak.models.map.storage.ModelCriteriaBuilder) operations, and operation for determining the number of the objects satisfying given criteria (getCount(org.keycloak.models.map.storage.ModelCriteriaBuilder)).

Author:

hmlnarik

Method Summary

Modifier and Type	Method and Description
V	create(K key, V value) Creates an object in the store identified by given key.
ModelCriteriaBuilder<M>	createCriteriaBuilder() Returns criteria builder for the storage engine.
MapKeycloakTransaction<K,V,M>	createTransaction(KeycloakSession session) Creates a MapKeycloakTransaction object that tracks a new transaction related to this storage.
boolean	delete(K key) Deletes object with the given key from the storage, if exists, no-op otherwise.
long	delete(ModelCriteriaBuilder<M> criteria) Deletes objects that match the given criteria.
long	getCount(ModelCriteriaBuilder<M> criteria) Returns the number of objects satisfying given criteria from the storage.
StringKeyConvertor<K>	getKeyConvertor() Returns a StringKeyConvertor that is used to convert primary keys from String to internal representation and vice versa.
V	read(K key) Returns object with the given key from the storage or null if object does not exist.
Stream<V>	read(ModelCriteriaBuilder<M> criteria) Returns stream of objects satisfying given criteria from the storage.
V	update(K key, V value) Updates the object with the given id in the storage if it already exists.

Method Detail

create

V create(K key,
         V value)

Creates an object in the store identified by given key.

Parameters:

key - Key of the object as seen in the logical level

value - Entity

Returns:

Reference to the entity created in the store

Throws:

NullPointerException - if object or its key is null

read

V read(K key)

Returns object with the given key from the storage or null if object does not exist.
TODO: Consider returning Optional<V> instead.

Parameters:

key - Key of the object. Must not be null.

Returns:

See description

Throws:

NullPointerException - if the key is null

read

Stream<V> read(ModelCriteriaBuilder<M> criteria)

Returns stream of objects satisfying given criteria from the storage. The criteria are specified in the given criteria builder based on model properties.

Parameters:

criteria - Criteria filtering out the object, originally obtained from createCriteriaBuilder() method of this object. If null, it returns an empty stream.

Returns:

Stream of objects. Never returns null.

Throws:

IllegalStateException - If criteria is not compatible, i.e. has not been originally created by the createCriteriaBuilder() method of this object.

getCount

long getCount(ModelCriteriaBuilder<M> criteria)

Returns the number of objects satisfying given criteria from the storage. The criteria are specified in the given criteria builder based on model properties.

Parameters:

criteria -

Returns:

Number of objects. Never returns null.

Throws:

IllegalStateException - If criteria is not compatible, i.e. has not been originally created by the createCriteriaBuilder() method of this object.

update

V update(K key,
         V value)

Updates the object with the given id in the storage if it already exists.

Parameters:

key - Primary key of the object to update

value - Updated value

Throws:

NullPointerException - if object or its id is null

delete

boolean delete(K key)

Deletes object with the given key from the storage, if exists, no-op otherwise.

Parameters:

key -

Returns:

Returns true if the object has been deleted or result cannot be determined, false otherwise.

delete

long delete(ModelCriteriaBuilder<M> criteria)

Deletes objects that match the given criteria.

Parameters:

criteria -

Returns:

Number of removed objects (might return -1 if not supported)

Throws:

IllegalStateException - If criteria is not compatible, i.e. has not been originally created by the createCriteriaBuilder() method of this object.

createCriteriaBuilder

ModelCriteriaBuilder<M> createCriteriaBuilder()

Returns criteria builder for the storage engine. The criteria are specified in the given criteria builder based on model properties.
Note: While the criteria are formulated in terms of model properties, the storage engine may in turn process them into the best form that suits the underlying storage engine query language, e.g. to conditions on storage attributes or REST query parameters. If possible, do not delay filtering after the models are reconstructed from storage entities, in most cases this would be highly inefficient.

Returns:

See description. Never returns null

createTransaction

MapKeycloakTransaction<K,V,M> createTransaction(KeycloakSession session)

Creates a MapKeycloakTransaction object that tracks a new transaction related to this storage. In case of JPA or similar, the transaction object might be supplied by the container (via JTA) or shared same across storages accessing the same database within the same session; in other cases (e.g. plain map) a separate transaction handler might be created per each storage.

Returns:

See description. Never returns null

getKeyConvertor

StringKeyConvertor<K> getKeyConvertor()

Returns a StringKeyConvertor that is used to convert primary keys from String to internal representation and vice versa.

Returns:

See above. Never returns null.