Merge pull request #18 from ralf-ueberfuhr-ars/feature/db

Introduce Persistence Layer.

customer-api-provider/pom.xml

@@ -84,6 +84,14 @@
       <groupId>io.quarkus</groupId>
       <artifactId>quarkus-hibernate-validator</artifactId>
     </dependency>
+    <dependency>
+      <groupId>io.quarkus</groupId>
+      <artifactId>quarkus-hibernate-orm-panache</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.quarkus</groupId>
+      <artifactId>quarkus-jdbc-h2</artifactId>
+    </dependency>
   </dependencies>
 
   <build>

customer-api-provider/src/main/java/de/schulung/sample/quarkus/persistence/CustomerEntity.java

@@ -0,0 +1,30 @@
+package de.schulung.sample.quarkus.persistence;
+
+import de.schulung.sample.quarkus.domain.Customer;
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.time.LocalDate;
+import java.util.UUID;
+
+@Getter
+@Setter
+@Entity(name = "Customer")
+@Table(name = "CUSTOMERS")
+public class CustomerEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.UUID)
+  private UUID uuid;
+  @Size(min = 3, max = 100)
+  @NotNull
+  private String name;
+  @Column(name = "DATE_OF_BIRTH")
+  private LocalDate birthdate;
+  @NotNull
+  private Customer.CustomerState state = Customer.CustomerState.ACTIVE;
+
+}

customer-api-provider/src/main/java/de/schulung/sample/quarkus/persistence/CustomerEntityMapper.java

@@ -0,0 +1,16 @@
+package de.schulung.sample.quarkus.persistence;
+
+import de.schulung.sample.quarkus.domain.Customer;
+import org.mapstruct.Mapper;
+import org.mapstruct.MappingTarget;
+
+@Mapper(componentModel = "cdi")
+public interface CustomerEntityMapper {
+
+  CustomerEntity map(Customer source);
+
+  Customer map(CustomerEntity source);
+
+  void copy(CustomerEntity source, @MappingTarget Customer target);
+
+}

customer-api-provider/src/main/java/de/schulung/sample/quarkus/persistence/CustomerEntityRepository.java

@@ -0,0 +1,10 @@
+package de.schulung.sample.quarkus.persistence;
+
+import io.quarkus.hibernate.orm.panache.PanacheRepositoryBase;
+import jakarta.enterprise.context.ApplicationScoped;
+
+import java.util.UUID;
+
+@ApplicationScoped
+public class CustomerEntityRepository implements PanacheRepositoryBase<CustomerEntity, UUID> {
+}

customer-api-provider/src/main/java/de/schulung/sample/quarkus/persistence/CustomersSinkJdbcImpl.java

@@ -0,0 +1,208 @@
+package de.schulung.sample.quarkus.persistence;
+
+import de.schulung.sample.quarkus.domain.Customer;
+import de.schulung.sample.quarkus.domain.Customer.CustomerState;
+import de.schulung.sample.quarkus.domain.CustomersSink;
+import io.quarkus.arc.properties.IfBuildProperty;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.inject.Typed;
+import lombok.RequiredArgsConstructor;
+
+import javax.sql.DataSource;
+import java.sql.*;
+import java.time.LocalDate;
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.stream.Stream;
+
+@ApplicationScoped
+@Typed(CustomersSink.class)
+@RequiredArgsConstructor
+@IfBuildProperty(
+  name = "persistence.sink.implementation",
+  stringValue = "jdbc"
+)
+public class CustomersSinkJdbcImpl implements CustomersSink {
+
+  private final DataSource ds;
+
+  /* ******************************************************* *
+   * Converter methods - could be converter objects instead  *
+   * ******************************************************* */
+
+  private static UUID convertUuid(String uuid) {
+    return Optional.ofNullable(uuid)
+      .map(UUID::fromString)
+      .orElse(null);
+  }
+
+  private static String convertUuid(UUID uuid) {
+    return Optional.ofNullable(uuid)
+      .map(UUID::toString)
+      .orElse(null);
+  }
+
+  private static LocalDate convertDate(Date date) {
+    return Optional.ofNullable(date)
+      .map(Date::toLocalDate)
+      .orElse(null);
+  }
+
+  private static Date convertDate(LocalDate date) {
+    return Optional.ofNullable(date)
+      .map(Date::valueOf)
+      .orElse(null);
+  }
+
+  private static CustomerState convertState(int value) {
+    return CustomerState.values()[value];
+  }
+
+  private static int convertState(CustomerState value) {
+    return Optional.ofNullable(value)
+      .map(CustomerState::ordinal)
+      .orElse(0);
+
+  }
+
+  /* ******************************************************* *
+   * Row Mapping - could be a RowMapper object instead       *
+   * ******************************************************* */
+
+  private static Customer readSingle(ResultSet rs) throws SQLException {
+    return Customer.builder()
+      .uuid(convertUuid(rs.getString("UUID")))
+      .birthdate(convertDate(rs.getDate("DATE_OF_BIRTH")))
+      .name(rs.getString("NAME"))
+      .state(convertState(rs.getInt("STATE")))
+      .build();
+  }
+
+  private static Stream<Customer> readAll(ResultSet rs) throws SQLException {
+    Collection<Customer> result = new LinkedList<>();
+    while (rs.next()) {
+      result.add(readSingle(rs));
+    }
+    return result.stream();
+  }
+
+  /* ******************************************************* *
+   * CustomersSink implementation                            *
+   * ******************************************************* */
+
+  @Override
+  public Stream<Customer> findAll() {
+    try (Connection con = ds.getConnection();
+         Statement stmt = con.createStatement();
+         ResultSet rs = stmt.executeQuery(
+           "select * from CUSTOMERS"
+         )) {
+
+      return readAll(rs);
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+
+  @Override
+  public Stream<Customer> findByState(CustomerState state) {
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "select * from CUSTOMERS where STATE=?"
+         )) {
+
+      stmt.setInt(1, convertState(state));
+
+      try (ResultSet rs = stmt.executeQuery()) {
+        return readAll(rs);
+      }
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+
+  @Override
+  public Optional<Customer> findByUuid(UUID uuid) {
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "select * from CUSTOMERS where UUID=?"
+         )) {
+
+      stmt.setString(1, convertUuid(uuid));
+
+      try (ResultSet rs = stmt.executeQuery()) {
+        if (!rs.next()) {
+          return Optional.empty();
+        }
+        return Optional.of(readSingle(rs));
+      }
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+
+  @Override
+  public void save(Customer customer) {
+    // TODO only insert, we need an update too, if the UUID is already set
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "insert into CUSTOMERS(UUID,NAME,DATE_OF_BIRTH,STATE) values(?,?,?,?)",
+           Statement.RETURN_GENERATED_KEYS
+         )) {
+
+      stmt.setString(1, convertUuid(customer.getUuid()));
+      stmt.setString(2, customer.getName());
+      stmt.setDate(3, convertDate(customer.getBirthdate()));
+      stmt.setInt(4, convertState(customer.getState()));
+      stmt.executeUpdate();
+
+      try (ResultSet rs = stmt.getGeneratedKeys()) {
+        if (!rs.next()) {
+          throw new RuntimeException("not expected"); // bessere Exception
+        }
+        customer.setUuid(convertUuid(rs.getString(1)));
+      }
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+
+  @Override
+  public boolean delete(UUID uuid) {
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "delete from CUSTOMERS where UUID=?"
+         )) {
+
+      stmt.setString(1, convertUuid(uuid));
+      return stmt.executeUpdate() > 0;
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+
+  @Override
+  public long count() {
+    try (Connection con = ds.getConnection();
+         Statement stmt = con.createStatement();
+         ResultSet rs = stmt.executeQuery(
+           "select count(uuid) from CUSTOMERS"
+         )) {
+
+      if (!rs.next()) {
+        return 0;
+      }
+      return rs.getLong(1);
+
+    } catch (SQLException e) {
+      throw new RuntimeException(e); // eigene Exception?
+    }
+  }
+}

customer-api-provider/src/main/java/de/schulung/sample/quarkus/persistence/CustomersSinkJpaImpl.java

@@ -0,0 +1,85 @@
+package de.schulung.sample.quarkus.persistence;
+
+import de.schulung.sample.quarkus.domain.Customer;
+import de.schulung.sample.quarkus.domain.CustomersSink;
+import io.quarkus.arc.properties.IfBuildProperty;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.inject.Typed;
+import jakarta.persistence.EntityManager;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Optional;
+import java.util.UUID;
+import java.util.stream.Stream;
+
+@ApplicationScoped
+@Typed(CustomersSink.class)
+@RequiredArgsConstructor
+@IfBuildProperty(
+  name = "persistence.sink.implementation",
+  stringValue = "jpa"
+)
+public class CustomersSinkJpaImpl implements CustomersSink {
+
+  private final CustomerEntityMapper mapper;
+  private final EntityManager em;
+
+  @Override
+  public Stream<Customer> findAll() {
+    return em.createQuery(
+      "select c from Customer c",
+      CustomerEntity.class
+    )
+      .getResultList()
+      .stream()
+      .map(mapper::map);
+  }
+
+  @Override
+  public Stream<Customer> findByState(Customer.CustomerState state) {
+    return em.createQuery(
+        "select c from Customer c where c.state = :state",
+        CustomerEntity.class
+      )
+      .setParameter("state", state)
+      .getResultList()
+      .stream()
+      .map(mapper::map);
+  }
+
+  @Override
+  public Optional<Customer> findByUuid(UUID uuid) {
+    return Optional
+      .ofNullable(em.find(CustomerEntity.class, uuid))
+      .map(mapper::map);
+  }
+
+  @Override
+  public void save(Customer customer) {
+    var entity = this.mapper.map(customer);
+    em.persist(entity);
+    //customer.setUuid(entity.getUuid());
+    mapper.copy(entity, customer);
+  }
+
+  @Override
+  public boolean delete(UUID uuid) {
+    var found = em.find(CustomerEntity.class, uuid);
+    if(found == null) {
+      return false;
+    }
+    em.remove(found);
+    return true;
+  }
+
+  @Override
+  public boolean exists(UUID uuid) {
+    var found = em.find(CustomerEntity.class, uuid);
+    return found != null;
+  }
+
+  @Override
+  public long count() {
+    return 0; // TODO ??
+  }
+}