Decouple Paging and Sorting repositories from CrudRepository.

This way they can be combined with different variants of CrudRepositories.

This affects
`PagingAndSortingRepository`, `ReactiveSortingRepository`, `CoroutineSortingRepository`, and `RxJavaSortingRepository`.

Any repository implementing those interfaces now needs to also implement a suitable CRUD repository, or needs to manually add the methods from a CRUD repository as needed.

Closes #2537
Original pull request: #2540.

Author: schauder

src/main/asciidoc/repositories.adoc

@@ -58,13 +58,13 @@ public interface CrudRepository<T, ID> extends Repository<T, ID> {
 NOTE: We also provide persistence technology-specific abstractions, such as `JpaRepository` or `MongoRepository`.
 Those interfaces extend `CrudRepository` and expose the capabilities of the underlying persistence technology in addition to the rather generic persistence technology-agnostic interfaces such as `CrudRepository`.
 
-On top of the `CrudRepository`, there is a https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/PagingAndSortingRepository.html[`PagingAndSortingRepository`] abstraction that adds additional methods to ease paginated access to entities:
+Additional to the `CrudRepository`, there is a https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/PagingAndSortingRepository.html[`PagingAndSortingRepository`] abstraction that adds additional methods to ease paginated access to entities:
 
 .`PagingAndSortingRepository` interface
 ====
 [source,java]
 ----
-public interface PagingAndSortingRepository<T, ID> extends CrudRepository<T, ID> {
+public interface PagingAndSortingRepository<T, ID>  {
 
   Iterable<T> findAll(Sort sort);
 
@@ -210,17 +210,35 @@ The sections that follow explain each step in detail:
 
 To define a repository interface, you first need to define a domain class-specific repository interface.
 The interface must extend `Repository` and be typed to the domain class and an ID type.
-If you want to expose CRUD methods for that domain type, extend `CrudRepository` instead of `Repository`.
+If you want to expose CRUD methods for that domain type, you may extend `CrudRepository`, or one of its variants instead of `Repository`.
 
 [[repositories.definition-tuning]]
 === Fine-tuning Repository Definition
 
-Typically, your repository interface extends `Repository`, `CrudRepository`, or `PagingAndSortingRepository`.
-Alternatively, if you do not want to extend Spring Data interfaces, you can also annotate your repository interface with `@RepositoryDefinition`.
-Extending `CrudRepository` exposes a complete set of methods to manipulate your entities.
-If you prefer to be selective about the methods being exposed, copy the methods you want to expose from `CrudRepository` into your domain repository.
+There are a few variants how you can get started with your repository interface.
 
-NOTE: Doing so lets you define your own abstractions on top of the provided Spring Data Repositories functionality.
+The typical approach is to extend `CrudRepository`, which gives you methods for CRUD functionality.
+CRUD stands for Create, Read, Update, Delete.
+With version 3.0 we also introduced `ListCrudRepository` which is very similar to the `CrudRepository` but for those methods that return multiple entities it returns a `List` instead of an `Iterable` which you might find easier to use.
+
+If you are using a reactive store you might choose `ReactiveCrudRepository`, or `RxJava3CrudRepository` depending on which reactive framework you are using.
+
+If you are using Kotlin you might pick `CoroutineCrudRepository` which utilizes Kotlin's coroutines.
+
+Additional you can extend `PagingAndSortingRepository`, `ReactiveSortingRepository`, `RxJava3SortingRepository`, or `CoroutineSortingRepository` if you need methods that allow to specify a `Sort` abstraction or in the first case a `Pageable` abstraction.
+Note that the various sorting repositories no longer extended their respective CRUD repository as they did in Spring Data Versions pre 3.0.
+Therefore, you need to extend both interfaces if you want functionality of both.
+
+If you do not want to extend Spring Data interfaces, you can also annotate your repository interface with `@RepositoryDefinition`.
+Extending one of the CRUD repository interfaces exposes a complete set of methods to manipulate your entities.
+If you prefer to be selective about the methods being exposed, copy the methods you want to expose from the CRUD repository into your domain repository.
+When doing so, you may change the return type of methods.
+Spring Data will honor the return type if possible.
+For example, for methods returning multiple entities you may choose `Iterable<T>`, `List<T>`, `Collection<T>` or a VAVR list.
+
+If many repositories in your application should have the same set of methods you can define your own base interface to inherit from.
+Such an interface must be annotated with `@NoRepositoryBean`.
+This prevents Spring Data to try to create an instance of it directly and failing because it can't determine the entity for that repository, since it still contains a generic type variable.
 
 The following example shows how to selectively expose CRUD methods (`findById` and `save`, in this case):
 

src/main/java/org/springframework/data/repository/PagingAndSortingRepository.java

@@ -20,16 +20,19 @@
 import org.springframework.data.domain.Sort;
 
 /**
- * Extension of {@link CrudRepository} to provide additional methods to retrieve entities using the pagination and
- * sorting abstraction.
+ * Repository fragment to provide methods to retrieve entities using the pagination and sorting abstraction. In many
+ * cases this will be combined with {@link CrudRepository} or similar or with manually added methods to provide CRUD
+ * functionality.
  *
  * @author Oliver Gierke
+ * @author Jens Schauder
  * @see Sort
  * @see Pageable
  * @see Page
+ * @see CrudRepository
  */
 @NoRepositoryBean
-public interface PagingAndSortingRepository<T, ID> extends CrudRepository<T, ID> {
+public interface PagingAndSortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/reactive/ReactiveSortingRepository.java

@@ -20,20 +20,24 @@
 
 import org.springframework.data.domain.Sort;
 import org.springframework.data.repository.NoRepositoryBean;
+import org.springframework.data.repository.Repository;
 
 /**
- * Extension of {@link ReactiveCrudRepository} to provide additional methods to retrieve entities using the sorting
- * abstraction.
+ * Repository fragment to provide methods to retrieve entities using the sorting abstraction. In many cases it
+ * should be combined with {@link ReactiveCrudRepository} or a similar repository interface in order to add CRUD
+ * functionality.
  *
  * @author Mark Paluch
  * @author Christoph Strobl
+ * @author Jens Schauder
  * @since 2.0
  * @see Sort
  * @see Mono
  * @see Flux
+ * @see ReactiveCrudRepository
  */
 @NoRepositoryBean
-public interface ReactiveSortingRepository<T, ID> extends ReactiveCrudRepository<T, ID> {
+public interface ReactiveSortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/reactive/RxJava3SortingRepository.java

@@ -19,18 +19,21 @@
 
 import org.springframework.data.domain.Sort;
 import org.springframework.data.repository.NoRepositoryBean;
+import org.springframework.data.repository.Repository;
 
 /**
- * Extension of {@link RxJava3CrudRepository} to provide additional methods to retrieve entities using the sorting
- * abstraction.
- *
+ * Repository fragment to provide methods to retrieve entities using the sorting abstraction. In many cases this
+ * should be combined with {@link RxJava3CrudRepository} or a similar interface to provide CRUD functionality.
+ * 
  * @author Mark Paluch
+ * @author Jens Schauder
  * @since 2.4
  * @see Sort
  * @see Flowable
+ * @see RxJava3CrudRepository
  */
 @NoRepositoryBean
-public interface RxJava3SortingRepository<T, ID> extends RxJava3CrudRepository<T, ID> {
+public interface RxJava3SortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/support/DefaultRepositoryInvokerFactory.java

@@ -35,6 +35,7 @@
  *
  * @author Oliver Gierke
  * @author Christoph Strobl
+ * @author Jens Schauder
  * @since 1.10
  */
 public class DefaultRepositoryInvokerFactory implements RepositoryInvokerFactory {
@@ -93,7 +94,7 @@ private RepositoryInvoker prepareInvokers(Class<?> domainType) {
 	@SuppressWarnings("unchecked")
 	protected RepositoryInvoker createInvoker(RepositoryInformation information, Object repository) {
 
-		if (repository instanceof PagingAndSortingRepository) {
+		if (repository instanceof PagingAndSortingRepository && repository instanceof CrudRepository) {
 			return new PagingAndSortingRepositoryInvoker((PagingAndSortingRepository<Object, Object>) repository, information,
 					conversionService);
 		} else if (repository instanceof CrudRepository) {

src/main/java/org/springframework/data/repository/support/PagingAndSortingRepositoryInvoker.java

@@ -21,6 +21,7 @@
 import org.springframework.core.convert.ConversionService;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
+import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.PagingAndSortingRepository;
 import org.springframework.data.repository.core.RepositoryMetadata;
 
@@ -29,6 +30,7 @@
  * avoid reflection overhead introduced by the superclass.
  *
  * @author Oliver Gierke
+ * @author Jens Schauder
  * @since 1.10
  */
 class PagingAndSortingRepositoryInvoker extends CrudRepositoryInvoker {
@@ -47,7 +49,7 @@ class PagingAndSortingRepositoryInvoker extends CrudRepositoryInvoker {
 	public PagingAndSortingRepositoryInvoker(PagingAndSortingRepository<Object, Object> repository,
 			RepositoryMetadata metadata, ConversionService conversionService) {
 
-		super(repository, metadata, conversionService);
+		super((CrudRepository<Object, Object>) repository, metadata, conversionService);
 
 		var crudMethods = metadata.getCrudMethods();
 

src/main/kotlin/org/springframework/data/repository/kotlin/CoroutineSortingRepository.kt

@@ -18,18 +18,23 @@ package org.springframework.data.repository.kotlin
 import kotlinx.coroutines.flow.Flow
 import org.springframework.data.domain.Sort
 import org.springframework.data.repository.NoRepositoryBean
+import org.springframework.data.repository.Repository
 
 /**
- * Extension of [CoroutineCrudRepository] to provide additional methods to retrieve entities using the sorting
+ * Repository fragment to provide methods to retrieve entities using the sorting
  * abstraction.
  *
+ * In many cases this should be combined with [CoroutineCrudRepository] or similar or manually added methods to provide CRUD functionality.
+ *
  * @author Mark Paluch
+ * @author Jens Schauder
  * @since 2.3
  * @see Flow
  * @see Sort
+ * @see CoroutineCrudRepository
  */
 @NoRepositoryBean
-interface CoroutineSortingRepository<T, ID> : CoroutineCrudRepository<T, ID> {
+interface CoroutineSortingRepository<T, ID> : Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/test/java/org/springframework/data/repository/core/support/AbstractRepositoryMetadataUnitTests.java

@@ -27,6 +27,7 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.querydsl.User;
+import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.PagingAndSortingRepository;
 import org.springframework.data.repository.Repository;
 import org.springframework.data.repository.core.RepositoryMetadata;
@@ -95,7 +96,7 @@ void handlesGenericTypeInReturnedCollectionCorrectly() throws SecurityException,
 	@Test // DATACMNS-471
 	void detectsArrayReturnTypeCorrectly() throws Exception {
 
-		RepositoryMetadata metadata = new DefaultRepositoryMetadata(PagedRepository.class);
+		RepositoryMetadata metadata = new DefaultRepositoryMetadata(CompletePageableAndSortingRepository.class);
 		var method = PagedRepository.class.getMethod("returnsArray");
 
 		assertThat(metadata.getReturnedDomainClass(method)).isEqualTo(User.class);
@@ -169,4 +170,8 @@ abstract class Container implements Iterable<Element> {}
 	interface ContainerRepository extends Repository<Container, Long> {
 		Container someMethod();
 	}
+
+	interface CompletePageableAndSortingRepository extends PagingAndSortingRepository<Container, Long> {
+	}
+
 }

src/test/java/org/springframework/data/repository/core/support/DefaultCrudMethodsUnitTests.java

@@ -197,7 +197,7 @@ interface Domain {}
 
 	interface DomainCrudRepository extends CrudRepository<Domain, Long> {}
 
-	interface DomainPagingAndSortingRepository extends PagingAndSortingRepository<Domain, Long> {}
+	interface DomainPagingAndSortingRepository extends PagingAndSortingRepository<Domain, Long>, CrudRepository<Domain, Long> {}
 
 	interface RepositoryWithCustomSave extends Repository<Domain, Serializable> {
 

src/test/java/org/springframework/data/repository/core/support/DefaultRepositoryInformationUnitTests.java

@@ -111,27 +111,11 @@ void considersIntermediateMethodsAsFinderMethods() {
 		assertThat(information.hasCustomMethod()).isFalse();
 	}
 
-	@Test
-	void discoversIntermediateMethodsAsBackingMethods() throws NoSuchMethodException, SecurityException {
-
-		var metadata = new DefaultRepositoryMetadata(CustomRepository.class);
-		var information = new DefaultRepositoryInformation(metadata,
-				PagingAndSortingRepository.class, RepositoryComposition.empty());
-
-		var method = CustomRepository.class.getMethod("findAll", Pageable.class);
-		assertThat(information.isBaseClassMethod(method)).isTrue();
-
-		method = getMethodFrom(CustomRepository.class, "existsById");
-
-		assertThat(information.isBaseClassMethod(method)).isTrue();
-		assertThat(information.getQueryMethods()).isEmpty();
-	}
-
 	@Test // DATACMNS-151
 	void doesNotConsiderManuallyDefinedSaveMethodAQueryMethod() {
 
 		RepositoryMetadata metadata = new DefaultRepositoryMetadata(CustomRepository.class);
-		RepositoryInformation information = new DefaultRepositoryInformation(metadata, PagingAndSortingRepository.class,
+		RepositoryInformation information = new DefaultRepositoryInformation(metadata, CompletePageableAndSortingRepository.class,
 				RepositoryComposition.empty());
 
 		assertThat(information.getQueryMethods()).isEmpty();
@@ -427,4 +411,8 @@ public Sample save(Sample entity) {
 			return entity;
 		}
 	}
+
+	interface CompletePageableAndSortingRepository<T, ID> extends CrudRepository<T, ID>, PagingAndSortingRepository<T, ID> {
+	}
+
 }

src/test/java/org/springframework/data/repository/core/support/ReactiveRepositoryInformationUnitTests.java

@@ -66,7 +66,7 @@ void discoversRxJava3MethodWithConvertibleArguments() throws Exception {
 	@Test // DATACMNS-836
 	void discoversMethodAssignableArguments() throws Exception {
 
-		var reference = extractTargetMethodFromRepository(ReactiveSortingRepository.class, "saveAll", Publisher.class);
+		var reference = extractTargetMethodFromRepository(ReactiveCrudRepository.class, "saveAll", Publisher.class);
 
 		assertThat(reference.getDeclaringClass()).isEqualTo(ReactiveCrudRepository.class);
 		assertThat(reference.getName()).isEqualTo("saveAll");

src/test/java/org/springframework/data/repository/core/support/ReactiveWrapperRepositoryFactorySupportUnitTests.java

@@ -20,6 +20,7 @@
 import io.reactivex.rxjava3.core.Completable;
 import io.reactivex.rxjava3.core.Maybe;
 import io.reactivex.rxjava3.core.Single;
+import org.springframework.data.repository.reactive.ReactiveCrudRepository;
 import reactor.core.publisher.Mono;
 
 import java.io.Serializable;
@@ -47,7 +48,7 @@ class ReactiveWrapperRepositoryFactorySupportUnitTests {
 
 	DummyRepositoryFactory factory;
 
-	@Mock ReactiveSortingRepository<Object, Serializable> backingRepo;
+	@Mock ReactiveCrudRepository<Object, Serializable> backingRepo;
 	@Mock ObjectRepositoryCustom customImplementation;
 
 	@BeforeEach

src/test/java/org/springframework/data/repository/core/support/RepositoryFactorySupportUnitTests.java

@@ -51,6 +51,7 @@
 import org.springframework.data.domain.Sort;
 import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.querydsl.QuerydslPredicateExecutor;
+import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.PagingAndSortingRepository;
 import org.springframework.data.repository.Repository;
 import org.springframework.data.repository.RepositoryDefinition;
@@ -90,7 +91,7 @@ class RepositoryFactorySupportUnitTests {
 
 	DummyRepositoryFactory factory;
 
-	@Mock PagingAndSortingRepository<Object, Object> backingRepo;
+	@Mock CrudRepository<Object, Object> backingRepo;
 	@Mock ObjectRepositoryCustom customImplementation;
 
 	@Mock MyQueryCreationListener listener;
@@ -167,12 +168,11 @@ void invokesCustomMethodCompositionMethodIfItRedeclaresACRUDOne() {
 	void createsRepositoryInstanceWithCustomIntermediateRepository() {
 
 		var repository = factory.getRepository(CustomRepository.class);
-		Pageable pageable = PageRequest.of(0, 10);
 
-		when(backingRepo.findAll(pageable)).thenReturn(new PageImpl<>(Collections.emptyList()));
-		repository.findAll(pageable);
+		when(backingRepo.findAll()).thenReturn(new PageImpl<>(Collections.emptyList()));
+		repository.findAll();
 
-		verify(backingRepo, times(1)).findAll(pageable);
+		verify(backingRepo, times(1)).findAll();
 	}
 
 	@Test

src/test/java/org/springframework/data/repository/support/CrudRepositoryInvokerUnitTests.java

@@ -153,7 +153,7 @@ interface OrderRepository extends CrudRepository<Order, Long> {
 
 	static class Person {}
 
-	interface PersonRepository extends PagingAndSortingRepository<Person, Long> {
+	interface PersonRepository extends PagingAndSortingRepository<Person, Long>, CrudRepository<Person, Long> {
 
 		Page<Person> findByFirstName(@Param("firstName") String firstName, Pageable pageable);
 

src/test/java/org/springframework/data/repository/support/DefaultRepositoryInvokerFactoryIntegrationTests.java

@@ -93,7 +93,6 @@ void createsCrudRepositoryInvokerForRepositoryExtendingCrudRepository() {
 		var invoker = factory.getInvokerFor(User.class);
 
 		assertThat(invoker)//
-				.isInstanceOf(CrudRepositoryInvoker.class)//
-				.isNotInstanceOf(PagingAndSortingRepositoryInvoker.class);
+				.isInstanceOf(CrudRepositoryInvoker.class);
 	}
 }