initial commit

src/main/java/nl/veenm/paypoint/service/CustomerService.java

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+package nl.veenm.paypoint.service;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.inject.Inject;
+import jakarta.transaction.Transactional;
+import nl.veenm.paypoint.domain.Customer;
+import nl.veenm.paypoint.repository.CustomerRepository;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@ApplicationScoped
+public class CustomerService {
+
+    @Inject
+    CustomerRepository customerRepository;
+
+    public CustomerService() {
+    }
+
+    @Transactional
+    public List<Customer> getCustomers() {
+        List<Customer> customers = customerRepository.listAll();
+        return customers.stream()
+                .sorted(Comparator.comparing(Customer::getFirstName))
+                .collect(Collectors.toList());
+    }
+
+    @Transactional
+    public void addCustomer(Customer customer) {
+        customerRepository.persist(customer);
+    }
+}