adding missing files

src/main/java/com/release11/klaus/service/EtrackService.java

@@ -0,0 +1,12 @@
+package com.release11.klaus.service;
+
+import com.release11.klaus.model.Event;
+import com.release11.klaus.model.EventRequestDto;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public interface EtrackService {
+    List<Event> getEventsByDateTimeAndBusinessKeys(EventRequestDto eventsDto);
+}

src/main/java/com/release11/klaus/service/EtrackServiceImpl.java

@@ -0,0 +1,29 @@
+package com.release11.klaus.service;
+
+import com.release11.klaus.model.Event;
+import com.release11.klaus.model.EventRequestDto;
+import com.release11.klaus.repository.EventRepository;
+import com.release11.klaus.utilis.BusinessKey;
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Slf4j
+@Service
+@AllArgsConstructor
+public class EtrackServiceImpl implements EtrackService {
+
+    private final EventRepository eventRepository;
+
+    @Override
+    public List<Event> getEventsByDateTimeAndBusinessKeys(EventRequestDto eventsDto) {
+        Map<BusinessKey, String> businessKeys = new HashMap<>();
+        businessKeys.put(BusinessKey.CLIENT_UUID, eventsDto.getClientUUID().toString());
+        return eventRepository.findEvents(eventsDto.getLocalDateTimeFrom(), eventsDto.getLocalDateTimeTo(),
+                businessKeys);
+    }
+}