Add alternative implementations with JPA and JDBC

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

@@ -0,0 +1,232 @@
+package de.samples.schulung.quarkus.persistence;
+
+import de.samples.schulung.quarkus.domain.Customer;
+import de.samples.schulung.quarkus.domain.Customer.CustomerState;
+import de.samples.schulung.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")))
+      .birthday(convertDate(rs.getDate("BIRTH_DATE")))
+      .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 insert(Customer customer) {
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "insert into CUSTOMERS(NAME,BIRTH_DATE,STATE) values(?,?,?)",
+           Statement.RETURN_GENERATED_KEYS
+         )) {
+
+      stmt.setString(1, customer.getName());
+      stmt.setDate(2, convertDate(customer.getBirthday()));
+      stmt.setInt(3, 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 void update(Customer customer) {
+    try (Connection con = ds.getConnection();
+         PreparedStatement stmt = con.prepareStatement(
+           "update CUSTOMERS set NAME=?, BIRTH_DATE=?, STATE=?) where UUID=?",
+           Statement.RETURN_GENERATED_KEYS
+         )) {
+
+      stmt.setString(1, customer.getName());
+      stmt.setDate(2, convertDate(customer.getBirthday()));
+      stmt.setInt(3, convertState(customer.getState()));
+      stmt.setString(4, convertUuid(customer.getUuid()));
+      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/samples/schulung/quarkus/persistence/CustomersSinkJpaImpl.java

@@ -0,0 +1,95 @@
+package de.samples.schulung.quarkus.persistence;
+
+import de.samples.schulung.quarkus.domain.Customer;
+import de.samples.schulung.quarkus.domain.CustomersSink;
+import io.quarkus.arc.properties.IfBuildProperty;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.inject.Typed;
+import jakarta.persistence.EntityManager;
+import jakarta.transaction.Transactional;
+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);
+  }
+
+  @Transactional
+  @Override
+  public void insert(Customer customer) {
+    var entity = this.mapper.map(customer);
+    em.persist(entity);
+    mapper.copy(entity, customer);
+  }
+
+  @Transactional
+  @Override
+  public void update(Customer customer) {
+    var entity = this.mapper.map(customer);
+    em.persist(entity);
+    mapper.copy(entity, customer);
+  }
+
+  @Transactional
+  @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 existsByUuid(UUID uuid) {
+    var found = em.find(CustomerEntity.class, uuid);
+    return found != null;
+  }
+
+  @Override
+  public long count() {
+    return 0; // TODO ??
+  }
+}