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CustomerRepository.java
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CustomerRepository.java
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/*
* Copyright 2013-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package example.springdata.jpa.java8;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Stream;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.Repository;
import org.springframework.scheduling.annotation.Async;
/**
* Repository to manage {@link Customer} instances.
*
* @author Oliver Gierke
* @author Thomas Darimont
*/
public interface CustomerRepository extends Repository<Customer, Long> {
/**
* Special customization of {@link CrudRepository#findOne(java.io.Serializable)} to return a JDK 8 {@link Optional}.
*
* @param id
* @return
*/
Optional<Customer> findById(Long id);
/**
* Saves the given {@link Customer}.
*
* @param customer
* @return
*/
<S extends Customer> S save(S customer);
/**
* Sample method to derive a query from using JDK 8's {@link Optional} as return type.
*
* @param lastname
* @return
*/
Optional<Customer> findByLastname(String lastname);
/**
* Sample default method to show JDK 8 feature support.
*
* @param customer
* @return
*/
default Optional<Customer> findByLastname(Customer customer) {
return findByLastname(customer == null ? null : customer.lastname);
}
/**
* Sample method to demonstrate support for {@link Stream} as a return type with a custom query. The query is executed
* in a streaming fashion which means that the method returns as soon as the first results are ready.
*
* @return
*/
@Query("select c from Customer c")
Stream<Customer> streamAllCustomers();
/**
* Sample method to demonstrate support for {@link Stream} as a return type with a derived query. The query is
* executed in a streaming fashion which means that the method returns as soon as the first results are ready.
*
* @return
*/
Stream<Customer> findAllByLastnameIsNotNull();
@Async
CompletableFuture<List<Customer>> readAllBy();
}