GORM 8 - A powerful Groovy-based data access toolkit for the JVM
+
+
+ GORM is the data access toolkit used by Grails
+ and provides a rich set
+ of APIs for accessing relational and non-relational data including implementations for
+ Hibernate (SQL), MongoDB, Neo4j, Cassandra and an in-memory ConcurrentHashMap for
+ testing.
+
+
+
+
+
+
Hibernate
+
+
The original implementation of GORM, GORM for Hibernate provides all the goodness of GORM for SQL databases.
+
+
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+ inputs.dir project.layout.projectDirectory.dir('src/main/docs')
+ outputs.dir project.layout.buildDirectory.dir('docs')
+
+ it.jvm {
+ jvmArgs("--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED")
+ }
+ it.baseDirFollowsSourceFile()
+ it.sourceDir project.layout.projectDirectory.dir('src/main/docs')
+ it.outputDir = project.layout.buildDirectory.dir('docs')
+ it.attributes asciidoctorAttributes
+}
+
diff --git a/docs/guide-developer/src/main/docs/gettingStarted.adoc b/docs/guide-developer/src/main/docs/gettingStarted.adoc
new file mode 100644
index 00000000000..19f7768fc5f
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/gettingStarted.adoc
@@ -0,0 +1,47 @@
+
+=== Checking out and Building
+
+
+The project is https://github.com/grails/grails-data-mapping[hosted on GitHub].
+
+You are free to fork the project from there or clone it anonymously using git:
+
+----
+git clone https://github.com/grails/grails-data-mapping.git
+cd grails-data-mapping
+----
+
+The project has a https://gradle.org[Gradle] build.
+
+To build the project you can run the `assemble` task:
+
+----
+./gradlew assemble
+----
+
+To install the jar files for the various subprojects into your local Maven repository you can run:
+
+----
+./gradlew publishToMavenLocal
+----
+
+=== Project Structure
+
+The project is essentially a multi-project Gradle build. There is a core API and then subprojects that implement that API. The core API subprojects include:
+
+* `grails-datastore-core` - The core API, this provides core interfaces for implementing a GORM provider
+* `grails-datastore-gorm` - The runtime meta-programming and AST transformation infrastructure behind GORM. This also provides end users with APIs like `grails.gorm.CriteriaBuilder` and `grails.gorm.DetachedCriteria`
+* `grails-datastore-gorm-support` - Support classes for easing the writing of a GORM plugin for Grails
+* `grails-datastore-gorm-tck` - The TCK that includes hundreds of Spock specifications that a GORM implementation will need to pass
+* `grails-datastore-web` - Classes required to integrate GORM into a web tier
+
+In addition to this, there are separate projects of GORM implementations for various datastores:
+
+* https://github.com/grails/gorm-hibernate4[GORM for Hibernate 4]
+* https://github.com/grails/gorm-hibernate5[GORM for Hibernate 5]
+* https://github.com/grails/gorm-mongodb[GORM for MongoDB]
+* https://github.com/grails/gorm-neo4j[GORM for Neo4j]
+* https://github.com/grails/gorm-redis[GORM for Redis]
+* https://github.com/grails/gorm-cassandra[GORM for Cassandra]
+
+
diff --git a/docs/guide-developer/src/main/docs/index.adoc b/docs/guide-developer/src/main/docs/index.adoc
new file mode 100644
index 00000000000..dacb6468afe
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/index.adoc
@@ -0,0 +1,62 @@
+:imagesdir: ./images
+:source-highlighter: coderay
+:toc: left
+:toc-title: GORM Developer Guide
+:numbered:
+:last-update-label!:
+
+= GORM Developer Guide
+Graeme Rocher
+
+[[introduction]]
+== Introduction
+
+include::introduction.adoc[]
+
+[[gettingStarted]]
+== Getting Started
+
+include::gettingStarted.adoc[]
+
+[[understandingApi]]
+== Understanding the GORM API
+
+include::understandingApi.adoc[]
+
+[[datastoreBasics]]
+=== Datastore Basics
+
+include::understandingApi/datastoreBasics.adoc[]
+
+[[implementingCrud]]
+=== Implementing CRUD
+
+include::understandingApi/implementingCrud.adoc[]
+
+[[secondaryIndexes]]
+=== Secondary Indexing
+
+include::understandingApi/secondaryIndexes.adoc[]
+
+[[implementingQueries]]
+=== Implementing Querying
+
+include::understandingApi/implementingQueries.adoc[]
+
+[[gormEnhancer]]
+=== GORM Enhancer
+
+include::understandingApi/gormEnhancer.adoc[]
+
+[[gormApis]]
+=== Adding to GORM APIs
+
+include::understandingApi/gormApis.adoc[]
+
+[[testing]]
+== Using the Test Compatibility Kit
+
+include::testing.adoc[]
+
+
+include::stepByStep.adoc[]
diff --git a/docs/guide-developer/src/main/docs/introduction.adoc b/docs/guide-developer/src/main/docs/introduction.adoc
new file mode 100644
index 00000000000..bee0574d9d4
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/introduction.adoc
@@ -0,0 +1,17 @@
+This documentation describes the GORM API mechanics and how a datastore implementation can be built to interface to any database providing a GORM API onto it. This documentation is mainly targeted at developers interested in creating implementations of GORM on top of alternative datastores.
+
+As of this writing the project has several implementations of GORM against a variety of different datastore implementations. Current implementations include:
+
+* Hibernate 3, 4 and 5
+* MongoDB
+* Redis
+* Neo4j
+* Cassandra
+* java.util.ConcurrentHashMap (the fastest datastore in the world)
+
+The remainder of this document describes how the project is structured, how to build a project and how to implement a GORM provider.
+
+
+
+
+
diff --git a/docs/guide-developer/src/main/docs/stepByStep.adoc b/docs/guide-developer/src/main/docs/stepByStep.adoc
new file mode 100644
index 00000000000..e7e7841fddc
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/stepByStep.adoc
@@ -0,0 +1,154 @@
+[[stepByStep]]
+== Step-by-Step Guide to Creating an Implementation
+
+To get started with a new GORM implementation, the following steps are required:
+
+
+=== Initial Directory Creation
+
+
+----
+git clone https://github.com/grails/grails-data-mapping.git
+cd grails-data-mapping
+mkdir grails-datastore-gorm-xyz
+----
+
+
+=== Setup Gradle Build
+
+
+Create build.gradle:
+
+----
+vi grails-datastore-gorm-xyz/build.gradle
+----
+
+With contents:
+
+[source,groovy]
+----
+dependencies {
+ implementation project(':grails-datastore-gorm'),
+ project(':grails-datastore-web'),
+ project(':grails-datastore-gorm-support')
+
+ testImplementation project(':grails-datastore-gorm-tck')
+ testRuntime "javax.servlet:javax.servlet-api:$servletApiVersion"
+
+}
+----
+
+Add new project to settings.gradle in root project:
+
+----
+vi settings.gradle
+----
+
+Changes shown below:
+
+[source,groovy]
+----
+// GORM Implementations
+'grails-datastore-gorm-neo4j',
+'grails-datastore-gorm-xyz',
+...
+----
+
+
+=== Create Project Source Directories
+
+
+----
+mkdir grails-datastore-gorm-xyz/src/main/groovy
+mkdir grails-datastore-gorm-xyz/src/test/groovy
+----
+
+
+=== Generate IDE Project Files and Import into IDE (Optional)
+
+
+----
+./gradlew grails-datastore-gorm-xyz:idea
+----
+
+Or
+
+----
+./gradlew grails-datastore-gorm-xyz:eclipse
+----
+
+
+=== Implement Required Interfaces
+
+
+In `src/main/groovy` create implementations:
+
+* `org.grails.datastore.xyz.XyzDatastore` extends and implements `org.grails.datastore.mapping.core.AbstractDatastore`
+* `org.grails.datastore.xyz.XyzSession` extends and implements `org.grails.datastore.mapping.core.AbstractSession`
+* `org.grails.datastore.xyz.engine.XyzEntityPersister` extends and implements `org.grails.datastore.mapping.engine.NativeEntryEntityPersister`
+* `org.grails.datastore.xyz.query.XyzQuery` extends and implements `org.grails.datastore.mapping.query.Query`
+
+
+=== Create Test Suite
+
+
+In `src/test/groovy` create `org.grails.datastore.gorm.Setup` class to configure TCK:
+
+[source,groovy]
+----
+class Setup {
+
+ static xyz
+ static destroy() {
+ xyz.disconnect()
+ }
+ static Session setup(classes) {
+ def ctx = new GenericApplicationContext()
+ ctx.refresh()
+ xyz = new XyzDatastore(ctx)
+ for (cls in classes) {
+ xyz.mappingContext.addPersistentEntity(cls)
+ }
+
+
+ def enhancer = new GormEnhancer(xyz, new DatastoreTransactionManager(datastore: xyz))
+ enhancer.enhance()
+
+ xyz.mappingContext.addMappingContextListener({ e -> enhancer.enhance e } as MappingContext.Listener)
+ xyz.applicationContext.addApplicationListener new DomainEventListener(xyz)
+ xyz.applicationContext.addApplicationListener new AutoTimestampEventListener(xyz)
+
+ xyz.connect()
+ }
+}
+----
+
+Then in `src/test/groovy` create test suite class to allow running tests in IDE (without this you won't be able to run TCK tests from the IDE). Example test suite:
+
+[source,groovy]
+----
+package org.grails.datastore.gorm
+
+import org.junit.runners.Suite.SuiteClasses
+import org.junit.runners.Suite
+import org.junit.runner.RunWith
+import grails.gorm.tests.*
+
+/**
+ * @author graemerocher
+ */
+@RunWith(Suite)
+@SuiteClasses([
+ FindByMethodSpec,
+ ListOrderBySpec
+])
+class XyzTestSuite {
+}
+----
+
+
+=== Implement the TCK!
+
+
+Keep iterating until you have implemented all the tests in the TCK.
+
diff --git a/docs/guide-developer/src/main/docs/testing.adoc b/docs/guide-developer/src/main/docs/testing.adoc
new file mode 100644
index 00000000000..7faabeba669
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/testing.adoc
@@ -0,0 +1,59 @@
+The `grails-datastore-gorm-tck` project provides several hundred tests to guarantee that a particular GORM implementation is compliant. To use the TCK you need to define a dependency on the TCK in the subprojects `build.gradle` file:
+
+[source,groovy]
+----
+testCompile project(':grails-datastore-gorm-tck')
+----
+
+Then create a `Setup.groovy` file that sets up your custom datastore in your implementation.
+
+For example the `ConcurrentHashMap` implementation has one defined in `grails-datastore-gorm-test/src/test/groovy/org/grails/datastore/gorm/Setup.groovy`:
+
+[source,groovy]
+----
+class Setup {
+
+ static destroy() {
+ // noop
+ }
+ static Session setup(classes) {
+
+ def ctx = new GenericApplicationContext()
+ ctx.refresh()
+ def simple = new SimpleMapDatastore(ctx)
+
+ ...
+ for (cls in classes) {
+ simple.mappingContext.addPersistentEntity(cls)
+ }
+
+ ...
+ def enhancer = new GormEnhancer(simple, new DatastoreTransactionManager(datastore: simple))
+ enhancer.enhance()
+
+ simple.mappingContext.addMappingContextListener({ e -> enhancer.enhance e } as MappingContext.Listener)
+
+ simple.applicationContext.addApplicationListener new DomainEventListener(simple)
+ simple.applicationContext.addApplicationListener new AutoTimestampEventListener(simple)
+
+ return simple.connect()
+ }
+}
+----
+
+Some setup code has been omitted for clarity, but essentially, the `Setup.groovy` class should initialize the `Datastore` and return a `Session` from the static setup method, which is passed a list of classes to configure.
+
+With this setup, all the TCK tests will be run against the subproject. If a specific test cannot be implemented due to the underlying datastore lacking support for a particular feature, you can create a test with the same name as the failing test, and that will then override the corresponding test in the TCK.
+
+For example: SimpleDB doesn't support pagination. Add a `grails.gorm.tests.PagedResultSpec` class that overrides the one from the TCK. Each test is a Spock specification and Spock has an `Ignore` annotation that can be used to ignore a particular test:
+
+[source,groovy]
+----
+/**
+ * Ignored for SimpleDB because SimpleDB doesn't support pagination
+ */
+@Ignore
+class PagedResultSpec extends GormDatastoreSpec{
+ ...
+}
+----
\ No newline at end of file
diff --git a/docs/guide-developer/src/main/docs/understandingApi.adoc b/docs/guide-developer/src/main/docs/understandingApi.adoc
new file mode 100644
index 00000000000..b5a711e96e4
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/understandingApi.adoc
@@ -0,0 +1,7 @@
+
+=== Introduction
+
+The GORM Developer API is divided into a low-level API that implementors must implement for each specific datastore, and a set of higher-level APIs that enhance domain classes with features visible to regular users, such as dynamic finders, criteria queries, and so on.
+
+The low-level API classes are located within the `grails-datastore-core` subproject, whereas the higher-level APIs used to enhance domain classes can be found in `grails-datastore-gorm`. In this section, we will discuss the low-level API.
+
diff --git a/docs/guide-developer/src/main/docs/understandingApi/datastoreBasics.adoc b/docs/guide-developer/src/main/docs/understandingApi/datastoreBasics.adoc
new file mode 100644
index 00000000000..0209133ed1e
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/understandingApi/datastoreBasics.adoc
@@ -0,0 +1,100 @@
+
+==== The MappingContext
+
+
+The `org.grails.datastore.mapping.model.MappingContext` interface is used to obtain metadata about the classes that are configured for persistence. There are `org.grails.datastore.mapping.model.PersistentEntity` and `org.grails.datastore.mapping.model.PersistentProperty` interfaces that represent a class and its properties respectively. These can be obtained and introspected via the `MappingContext`.
+
+There are various concrete implementations of the `MappingContext` interface such as:
+
+* `DocumentMappingContext` - Used for document stores, subclassed by `MongoMappingContext`
+* `JpaMappingContext` - Used for JPA
+* `KeyValueMappingContext` - Used by key/value stores
+
+Creating a new `MappingContext` may be useful because it allows users to configure how a class is mapped to the underlying datastore using GORM's `mapping` block as well as allowing registration of custom type converters and so on. The implementation for Neo4j looks like this:
+
+[source,groovy]
+----
+class Neo4jMappingContext extends AbstractMappingContext {
+
+ MappingFactory mappingFactory
+ MappingConfigurationStrategy syntaxStrategy
+
+ Neo4jMappingContext() {
+ mappingFactory = new GraphGormMappingFactory()
+ syntaxStrategy = new GormMappingConfigurationStrategy(mappingFactory)
+ //addTypeConverter(new StringToNumberConverterFactory().getConverter(BigDecimal))
+ addTypeConverter(new StringToShortConverter())
+ addTypeConverter(new StringToBigIntegerConverter())
+ ...
+ }
+
+ @Override
+ protected PersistentEntity createPersistentEntity(Class javaClass) {
+ GraphPersistentEntity persistentEntity = new GraphPersistentEntity(javaClass, this)
+ mappingFactory.createMappedForm(persistentEntity) // populates mappingFactory.entityToPropertyMap as a side effect
+ persistentEntity
+ }
+
+ MappingConfigurationStrategy getMappingSyntaxStrategy() {
+ syntaxStrategy
+ }
+
+ MappingFactory getMappingFactory() {
+ mappingFactory
+ }
+}
+----
+
+
+Notice how Neo4j provides a custom `GraphGormMappingFactory` and `GraphPersistentEntity` to allow the domain class configuration to be changed for a given Neo4j `Node`.
+
+
+==== The Datastore Interface
+
+
+The `org.grails.datastore.mapping.core.Datastore` interface is the equivalent of a SQL `DataSource` where by it provides the necessary capability to create a connection. In most cases one can simply subclass the `AbstractDatastore` super class and implement the `createSession` method. The following implementation is from the `SimpleMapDatastore` which implements GORM ontop of a `ConcurrentHashMap`:
+
+[,java]
+----
+@Override
+protected Session createSession(PropertyResolver connDetails) {
+ return new SimpleMapSession(this, getMappingContext(), getApplicationEventPublisher());
+}
+----
+
+The implementation depends a lot on the underlying datastore. For example for MongoDB the following implementation is used:
+
+[,java]
+----
+@Override
+protected Session createSession(PropertyResolver connDetails) {
+ return new MongoSession(this, getMappingContext(), getApplicationEventPublisher(), false);
+}
+----
+
+Notice that the `Datastore` also has a reference to the `MappingContext` discussed in the previous section.
+
+
+
+==== The Session Interface
+
+
+The `org.grails.datastore.mapping.core.Session` interface represents an active connection. It can be either stateful or stateless, depending on the implementation. For example of embedded databases where there is no network connection, a stateful session is not particularly useful, but a datastore that creates network connections you may want to cache returned instances to reduce load.
+
+The `AbstractSession` class provides some support for creating stateful sessions, if you prefer a stateless implementation then simply implement `Session` or subclass `AbstractAttributeStoringSession`.
+
+In general, if you subclass `AbstractSession`, the minimum you need to do is implement the `createPersister` method:
+
+[,java]
+----
+protected Persister createPersister(Class cls, MappingContext mappingContext) {
+ PersistentEntity entity = mappingContext.getPersistentEntity(cls.getName());
+ if (entity == null) {
+ return null;
+ }
+ return new SimpleMapEntityPersister(mappingContext, entity, this,
+ (SimpleMapDatastore) getDatastore(), publisher);
+}
+----
+
+The example above is from the `SimpleMapSession` implementation, which creates a `SimpleMapEntityPersister` instance and returns it. Returning null indicates that the class cannot be persisted and an exception will be thrown.
\ No newline at end of file
diff --git a/docs/guide-developer/src/main/docs/understandingApi/gormApis.adoc b/docs/guide-developer/src/main/docs/understandingApi/gormApis.adoc
new file mode 100644
index 00000000000..1856a7e6624
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/understandingApi/gormApis.adoc
@@ -0,0 +1,46 @@
+By default, the GORM compiler ensures that all GORM entities implement the `GormEntity` trait, which provides them with all the default GORM methods. Nevertheless, if there's a need to extend GORM functionality to incorporate additional methods tailored to a specific datastore, you can achieve this by extending the `GormEntity` trait.
+
+For example Neo4j adds methods for Cypher querying:
+
+[source,groovy]
+----
+trait Neo4jEntity extends GormEntity {
+
+ static Result cypherStatic(String queryString, Map params ) {
+ def session = AbstractDatastore.retrieveSession(Neo4jDatastore)
+ def graphDatabaseService = (GraphDatabaseService)session.nativeInterface
+ graphDatabaseService.execute(queryString, params)
+ }
+}
+----
+
+With this addition, you need to instruct the GORM compiler to make entities implement this trait. To achieve this, implement a `TraitProvider`:
+
+[source,groovy]
+----
+package org.grails.datastore.gorm.neo4j
+
+import grails.neo4j.Neo4jEntity
+import groovy.transform.CompileStatic
+import org.grails.compiler.gorm.GormEntityTraitProvider
+
+@CompileStatic
+class Neo4jEntityTraitProvider implements GormEntityTraitProvider {
+ final Class entityTrait = Neo4jEntity
+}
+----
+
+And then add a `src/main/resources/META-INF/services/org.grails.compiler.gorm.GormEntityTraitProvider` file specifying the name of your trait provider:
+
+----
+org.grails.datastore.gorm.neo4j.Neo4jEntityTraitProvider
+----
+
+GORM will automatically inject the trait into any domain class discovered in `grails-app/domain` or annotated with the `Entity` annotation. However, if Hibernate is present on the classpath, you must inform GORM to map the domain class with Neo4j:
+
+[,groovy]
+----
+static mapWith = "neo4j"
+----
+
+
diff --git a/docs/guide-developer/src/main/docs/understandingApi/gormEnhancer.adoc b/docs/guide-developer/src/main/docs/understandingApi/gormEnhancer.adoc
new file mode 100644
index 00000000000..316d24b0a91
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/understandingApi/gormEnhancer.adoc
@@ -0,0 +1,40 @@
+Once you have implemented the lower-level APIs you can trivially provide a GORM API to a set of Grails domain classes. For example consider the following simple domain class:
+
+[source,groovy]
+----
+import grails.persistence.*
+
+@Entity
+class Book {
+ String title
+}
+----
+
+
+The following setup code can be written to enable GORM for MongoDB:
+
+[source,groovy]
+----
+// create context
+def context = new MongoMappingContext(databaseName)
+context.addPersistentEntity(Book)
+
+// create datastore
+def mongoDatastore = new MongoDatastore(context)
+mongoDatastore.afterPropertiesSet()
+
+// enhance
+def enhancer = new MongoGormEnhancer(mongoDatastore, new DatastoreTransactionManager(datastore: mongoDatastore))
+enhancer.enhance()
+
+// use GORM!
+def books = Book.list()
+----
+
+The key element for enabling the use of all GORM methods (`list()`, dynamic finders, etc.) is the utilization of the `MongoGormEnhancer`. This class is a subclass of `org.grails.datastore.gorm.GormEnhancer` and offers extensions to GORM specifically tailored for MongoDB. However, a subclass is not mandatory, and if you don't need any datastore-specific extensions, you can equally use the standard `GormEnhancer`:
+
+[source,groovy]
+----
+def enhancer = new GormEnhancer(mongoDatastore, new DatastoreTransactionManager(datastore: mongoDatastore))
+enhancer.enhance()
+----
\ No newline at end of file
diff --git a/docs/guide-developer/src/main/docs/understandingApi/implementingCrud.adoc b/docs/guide-developer/src/main/docs/understandingApi/implementingCrud.adoc
new file mode 100644
index 00000000000..227fc031906
--- /dev/null
+++ b/docs/guide-developer/src/main/docs/understandingApi/implementingCrud.adoc
@@ -0,0 +1,193 @@
+
+==== The EntityPersister Interface
+
+
+The `EntityPersister` interface is used to implement the basic Create, Read, Update and Delete (CRUD) operations. There are individual methods to implement such as `persistEntity`, `updateEntity`, `deleteEntity` and so on.
+
+In many cases there is a representation of an entity in its "native" form as supplied by the datastore driver. For example in Cassandra this could be a `ColumnFamily`, or in MongoDB a `DBCollection`.
+
+To support implementing such cases, there is an abstract `NativeEntryEntityPersister` super class that provides the basis for an implementation that maps a native entry, such as a MongoDB `DBObject` or a Neo4j `Node`, to a persisted entity and back again.
+
+The two generic types of this superclass indicate the native entry type (example `DBObject` in MongoDB) and the native key type (example `ObjectId` in MongoDB). The MongoDB implementation looks like this:
+
+[,java]
+----
+public class MongoEntityPersister extends NativeEntryEntityPersister
+----
+
+Note that `Object` is used for the key since MongoDB also supports Long and String-based identifiers.
+
+They key methods that need implementing are defined below:
+
+* `getEntityFamily()` - Defines the name of the entity group or family. This could be a database table, a Cassandra Column Family or a MongoDB collection
+* `T createNewEntry(String family)` - Creates a native entry ready to be inserted
+* `Object getEntryValue(T nativeEntry, String property)` - Retrieves a value of entry and returns its Java object form. For example a "date" property stored as a String in the datastore would need to be returned as a java.util.Date at this point
+* `setEntryValue(T nativeEntry, String key, Object value)` - Sets a value of the native entry, converting any Java objects to the required native format
+* `deleteEntry(String family, K key, Object entry)` - Deletes an entry for the given family, native key and entry
+* `T retrieveEntry(PersistentEntity persistentEntity, String family, Serializable key)` - Retrieves a native entry for the given entity, family and key
+* `K storeEntry(PersistentEntity persistentEntity, EntityAccess entityAccess, K storeId, T nativeEntry)` - Stores a native entry for the given id
+* `updateEntry(PersistentEntity persistentEntity, EntityAccess entityAccess, K key, T entry)` - Updates an entry
+* `K generateIdentifier(PersistentEntity persistentEntity, T entry)` - Generate an identifier for the given native entry
+* `PropertyValueIndexer getPropertyIndexer(PersistentProperty property)` - If the datastore requires manual indexing, you'll need to implement a `PropertyIndexer`, otherwise return null
+* `AssociationIndexer getAssociationIndexer(T nativeEntry, Association association)` - If the datastore requires manual indexing, you'll need to implement a `AssociationIndexer`, otherwise return null
+
+
+
+
+
+==== Create
+
+
+The `createNewEntry` method is used to create a native record that will be inserted into the datastore. In MongoDB this is a `DBObject` whilst in the implementation for `ConcurrentHashMap` it is another `Map`:
+
+[,java]
+----
+@Override
+protected DBObject createNewEntry(String family) {
+ return new BasicDBObject();
+}
+----
+
+
+==== Read
+
+
+The `retrieveEntry` method is used to retrieve a native record for a given key:
+
+[,java]
+----
+protected DBObject retrieveEntry(final PersistentEntity persistentEntity,
+ String family, final Serializable key) {
+ return mongoTemplate.execute(new DbCallback() {
+ public DBObject doInDB(DB con) throws MongoException, DataAccessException {
+ DBCollection dbCollection = con.getCollection(getCollectionName(persistentEntity));
+ return dbCollection.findOne(key);
+ }
+ });
+}
+----
+
+Here you can see the `MongoDB` implementation that uses a Spring Data `MongoTemplate` to find a `DBObject` for the given key. There is a separate `storeEntry` method that is used to actually store the native object. In `MongoDB` this looks like:
+
+[,java]
+----
+@Override
+protected Object storeEntry(final PersistentEntity persistentEntity, final EntityAccess entityAccess,
+ final Object storeId, final DBObject nativeEntry) {
+ return mongoTemplate.execute(new DbCallback
+ GORM
+