feat: CalendarService 추가

- 전략 + 플라이웨이트 패턴 적용 테스트 포함

Resolves: #38

application/wypl-core/src/main/java/com/wypl/wyplcore/calendar/service/CalendarService.java

@@ -0,0 +1,48 @@
+package com.wypl.wyplcore.calendar.service;
+
+import com.wypl.jpacalendardomain.calendar.domain.Calendar;
+import com.wypl.jpacalendardomain.calendar.domain.MemberCalendar;
+import com.wypl.jpacalendardomain.calendar.mapper.ScheduleMapper;
+import com.wypl.jpacalendardomain.calendar.repository.ScheduleInfoRepository;
+import com.wypl.jpacalendardomain.calendar.repository.ScheduleRepository;
+import com.wypl.jpamemberdomain.member.Member;
+import com.wypl.wyplcore.auth.domain.AuthMember;
+import com.wypl.wyplcore.calendar.data.response.CalendarFindResponse;
+import com.wypl.wyplcore.calendar.data.response.FindCalendarResponse;
+import com.wypl.wyplcore.calendar.service.strategy.CalendarStrategy;
+import com.wypl.wyplcore.schedule.data.CalendarType;
+import com.wypl.wyplcore.calendar.data.request.CalendarFindRequest;
+import com.wypl.wyplcore.schedule.data.response.ScheduleFindResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.Map;
+
+@Service
+@RequiredArgsConstructor
+public class CalendarService {
+
+    private final ScheduleRepository scheduleRepository;
+    private final ScheduleInfoRepository scheduleInfoRepository;
+    private final Map<CalendarType, CalendarStrategy> calendarStrategyMap;
+
+    @Transactional
+    public FindCalendarResponse findCalendar(AuthMember authMember, long calendarId, CalendarFindRequest calendarFindRequest) {
+
+        Calendar foundCalendar = null;  // FIXME: calendarId로 foundCalendar 엔티티 검증 필요.
+        MemberCalendar foundMemberCalendar = null; // Fixme: memberCalendar 엔티티 검증 필요.
+        Member foundMember = null; // FIXME: member 엔티티 검증 필요.
+
+        CalendarType calendarType = calendarFindRequest.calendarType();
+        LocalDate startDate = calendarFindRequest.startDate();
+
+        List<ScheduleFindResponse> foundScheduleFindResponses = calendarStrategyMap.get(calendarType).getAllSchedule(foundCalendar.getId(), startDate);
+
+
+        CalendarFindResponse calendarFindResponse = new CalendarFindResponse(foundCalendar.getId(), foundMemberCalendar.getColor(), foundCalendar.getName());
+        return new FindCalendarResponse(calendarFindResponse, foundScheduleFindResponses);
+    }
+}

application/wypl-core/src/test/java/com/wypl/wyplcore/calendar/service/strategy/CalendarStrategyConfigTest.java

@@ -0,0 +1,45 @@
+package com.wypl.wyplcore.calendar.service.strategy;
+
+import com.wypl.wyplcore.schedule.data.CalendarType;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+class CalendarStrategyConfigTest {
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Test
+    void testRegisterBean(){
+        assertNotNull(applicationContext.getBean(CalendarStrategyConfig.class));
+        assertTrue(applicationContext.containsBean("calendarStrategyMap"));
+
+        Map<?, ?> instance = (Map<?, ?>) applicationContext.getBean("calendarStrategyMap");
+        for (Map.Entry<?, ?> entry : instance.entrySet()) {
+            assertThat(entry.getKey()).isInstanceOf(CalendarType.class);
+            assertThat(entry.getValue()).isInstanceOf(CalendarStrategy.class);
+            System.out.println(entry.getKey() + " : " + entry.getValue());
+        }
+    }
+
+    @Test
+    void testStrategyFlyweight() {
+
+        // Flyweight(CalendarStrategy)의 공유 역할을 하는 calendarStrategyMap이 싱글톤으로 관리되는 지 확인
+        Map<?, ?> instance = (Map<?, ?>) applicationContext.getBean("calendarStrategyMap");
+        Map<?, ?> instance2 = (Map<?, ?>) applicationContext.getBean("calendarStrategyMap");
+        assertEquals(instance, instance2);
+
+        // 여러 번 호출 시 같은 전략 인스턴스가 호출되는 지 확인
+        assertEquals(instance.get("DAY"), instance2.get("DAY"));
+    }
+}
+