Добавлены классы для пакетов и паттернов

src/main/java/ru/serega6531/packmate/service/StreamService.java

@@ -0,0 +1,28 @@
+package ru.serega6531.packmate.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import ru.serega6531.packmate.model.Stream;
+import ru.serega6531.packmate.repository.StreamRepository;
+
+import java.util.List;
+
+@Service
+public class StreamService {
+
+    private final StreamRepository repository;
+
+    @Autowired
+    public StreamService(StreamRepository repository) {
+        this.repository = repository;
+    }
+
+    public List<Stream> findAll() {
+        return repository.findAll();
+    }
+
+    public List<Stream> findAllByServicePort(int port) {
+        return repository.findAllByService_Port(port);
+    }
+
+}