#590 - Add R2DBC EntityCallback example.

r2dbc/example/src/main/java/example/springdata/r2dbc/entitycallback/ApplicationConfiguration.java

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+/*
+ * Copyright 2020 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
+ *
+ *      http://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.r2dbc.entitycallback;
+
+import io.r2dbc.spi.ConnectionFactory;
+import reactor.core.publisher.Mono;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ByteArrayResource;
+import org.springframework.data.r2dbc.mapping.event.BeforeConvertCallback;
+import org.springframework.r2dbc.connection.init.ConnectionFactoryInitializer;
+import org.springframework.r2dbc.connection.init.ResourceDatabasePopulator;
+import org.springframework.r2dbc.core.DatabaseClient;
+
+/**
+ * Application configuration defining a
+ *
+ * @author Mark Paluch
+ */
+@SpringBootApplication
+class ApplicationConfiguration {
+
+	@Bean
+	BeforeConvertCallback<Customer> idGeneratingCallback(DatabaseClient databaseClient) {
+
+		return (customer, sqlIdentifier) -> {
+
+			if (customer.getId() == null) {
+
+				return databaseClient.sql("SELECT primary_key.nextval") //
+						.map(row -> row.get(0, Long.class)) //
+						.first() //
+						.map(customer::withId);
+			}
+
+			return Mono.just(customer);
+		};
+	}
+
+	@Bean
+	ConnectionFactoryInitializer initializer(ConnectionFactory connectionFactory) {
+
+		ConnectionFactoryInitializer initializer = new ConnectionFactoryInitializer();
+		initializer.setConnectionFactory(connectionFactory);
+		initializer.setDatabasePopulator(new ResourceDatabasePopulator(new ByteArrayResource(("CREATE SEQUENCE primary_key;"
+				+ "DROP TABLE IF EXISTS customer;"
+				+ "CREATE TABLE customer (id INT PRIMARY KEY, firstname VARCHAR(100) NOT NULL, lastname VARCHAR(100) NOT NULL);")
+						.getBytes())));
+
+		return initializer;
+	}
+}

r2dbc/example/src/main/java/example/springdata/r2dbc/entitycallback/Customer.java

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+/*
+ * Copyright 2020 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
+ *
+ *      http://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.r2dbc.entitycallback;
+
+import lombok.AllArgsConstructor;
+import lombok.Value;
+import lombok.With;
+
+import org.springframework.data.annotation.Id;
+
+/**
+ * @author Mark Paluch
+ */
+@Value
+@AllArgsConstructor
+@With
+class Customer {
+
+	@Id Long id;
+	String firstname, lastname;
+}

r2dbc/example/src/main/java/example/springdata/r2dbc/entitycallback/CustomerRepository.java

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+/*
+ * Copyright 2020 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
+ *
+ *      http://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.r2dbc.entitycallback;
+
+import org.springframework.data.repository.reactive.ReactiveCrudRepository;
+
+/**
+ * @author Mark Paluch
+ */
+interface CustomerRepository extends ReactiveCrudRepository<Customer, Long> {}

r2dbc/example/src/test/java/example/springdata/r2dbc/entitycallback/CustomerRepositoryIntegrationTests.java

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+/*
+ * Copyright 2020 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
+ *
+ *      http://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.r2dbc.entitycallback;
+
+import static org.assertj.core.api.Assertions.*;
+
+import reactor.test.StepVerifier;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.test.context.junit4.SpringRunner;
+
+/**
+ * Integration test using {@link org.springframework.data.r2dbc.mapping.event.BeforeConvertCallback} to auto-generate an
+ * Id from a sequence.
+ *
+ * @author Mark Paluch
+ * @see ApplicationConfiguration#idGeneratingCallback(DatabaseClient)
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class CustomerRepositoryIntegrationTests {
+
+	@Autowired CustomerRepository customers;
+	@Autowired DatabaseClient database;
+
+	@Test
+	public void generatesIdOnInsert() throws IOException {
+
+		Customer dave = new Customer(null, "Dave", "Matthews");
+
+		this.customers.save(dave) //
+				.as(StepVerifier::create) //
+				.assertNext(actual -> {
+
+					assertThat(dave.getId()).isNull(); // immutable before save
+					assertThat(actual.getId()).isNotNull(); // after save
+				}).verifyComplete();
+	}
+}