From 0f9f591c6b23a70db57a62b169d0f3d29473b03c Mon Sep 17 00:00:00 2001
From: Anton Romanov <romanov73@gmail.com>
Date: Sat, 20 Jul 2019 15:36:10 +0400
Subject: [PATCH] work with different version of entity

---
 .../activity/api/ActivityRepository.java      |  6 ++
 .../common/model/AbstractActivity.java        |  4 ++
 .../common/service/ActivityService.java       | 21 +++++--
 .../activity/conference/model/Conference.java |  6 ++
 .../conference/service/ConferenceService.java | 42 +++++++++----
 .../grant/controller/GrantController.java     |  2 +-
 .../grant/service/GrantRepository.java        |  4 +-
 .../activity/grant/service/GrantService.java  | 20 +++---
 .../paper/controller/PaperController.java     |  2 +-
 .../activity/paper/service/PaperService.java  | 63 +++----------------
 .../project/controller/ProjectController.java |  2 +-
 .../project/service/ProjectService.java       |  9 +--
 .../students/controller/TaskController.java   |  2 +-
 .../ulstu/activity/students/model/Task.java   |  5 ++
 .../students/service/TaskService.java         | 40 ++----------
 .../timeline/service/EventService.java        |  1 -
 16 files changed, 102 insertions(+), 127 deletions(-)

diff --git a/src/main/java/ru/ulstu/activity/api/ActivityRepository.java b/src/main/java/ru/ulstu/activity/api/ActivityRepository.java
index e0be94d..e2feaf8 100644
--- a/src/main/java/ru/ulstu/activity/api/ActivityRepository.java
+++ b/src/main/java/ru/ulstu/activity/api/ActivityRepository.java
@@ -4,6 +4,8 @@ import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.repository.query.Param;
 
+import java.util.Optional;
+
 public interface ActivityRepository<T> {
     String findByNameAndNotId(@Param("name") String name, @Param("id") Integer id);
 
@@ -14,4 +16,8 @@ public interface ActivityRepository<T> {
     Page<T> findAll(Pageable pageable);
 
     void deleteById(Integer id);
+
+    Optional<T> findById(Integer id);
+
+    void detach(T t);
 }
diff --git a/src/main/java/ru/ulstu/activity/common/model/AbstractActivity.java b/src/main/java/ru/ulstu/activity/common/model/AbstractActivity.java
index f4271dc..8796bb0 100644
--- a/src/main/java/ru/ulstu/activity/common/model/AbstractActivity.java
+++ b/src/main/java/ru/ulstu/activity/common/model/AbstractActivity.java
@@ -1,8 +1,10 @@
 package ru.ulstu.activity.common.model;
 
+import ru.ulstu.activity.timeline.model.Event;
 import ru.ulstu.core.model.BaseEntity;
 import ru.ulstu.user.model.User;
 
+import java.util.List;
 import java.util.Set;
 
 public abstract class AbstractActivity extends BaseEntity {
@@ -17,4 +19,6 @@ public abstract class AbstractActivity extends BaseEntity {
     }
 
     public abstract Set<User> getActivityMembers();
+
+    public abstract List<Event> getEvents();
 }
diff --git a/src/main/java/ru/ulstu/activity/common/service/ActivityService.java b/src/main/java/ru/ulstu/activity/common/service/ActivityService.java
index cc7bb7b..382965b 100644
--- a/src/main/java/ru/ulstu/activity/common/service/ActivityService.java
+++ b/src/main/java/ru/ulstu/activity/common/service/ActivityService.java
@@ -13,6 +13,7 @@ import ru.ulstu.activity.timeline.service.EventService;
 import ru.ulstu.core.jpa.OffsetablePageRequest;
 import ru.ulstu.core.model.response.PageableItems;
 
+import javax.persistence.EntityNotFoundException;
 import java.io.IOException;
 import java.util.List;
 
@@ -47,23 +48,31 @@ public abstract class ActivityService<L extends ActivityListDto, T extends Abstr
     }
 
     @Transactional
-    public T update(T entity) {
+    public T update(T oldEntity, T entity) {
+        entity.getEvents().clear();
         eventService.deleteAll(getEvents(entity));
         eventService.createFromObject((EventSource) entity);
+        doActionsOnDiffObjects(oldEntity, entity);
         return activityRepository.save(entity);
     }
 
+    protected abstract void doActionsOnDiffObjects(T oldEntity, T entity);
+
     protected abstract List<Event> getEvents(T entity);
 
     @Transactional
     public D update(D entityDto) {
+        T oldEntity = activityRepository.getById(entityDto.getId());
+        //to init lazy collection
+        oldEntity.getActivityMembers();
+        activityRepository.detach(oldEntity);
         T newEntity;
         try {
             newEntity = copyFromDto(activityRepository.getById(entityDto.getId()), entityDto);
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
-        return getNewActivityDto(update(newEntity));
+        return getNewActivityDto(update(oldEntity, newEntity));
     }
 
     @Transactional
@@ -79,8 +88,13 @@ public abstract class ActivityService<L extends ActivityListDto, T extends Abstr
         return true;
     }
 
+    public D findDtoById(Integer id) {
+        return getNewActivityDto(findById(id));
+    }
+
     public T findById(Integer id) {
-        return activityRepository.getById(id);
+        return activityRepository.findById(id)
+                .orElseThrow(() -> new EntityNotFoundException("Entity with id=" + id + " not found"));
     }
 
     public PageableItems<T> findAll(int offset, int count) {
@@ -92,7 +106,6 @@ public abstract class ActivityService<L extends ActivityListDto, T extends Abstr
         return convertPageable(findAll(offset, count), entity -> getActivityListDto(entity));
     }
 
-
     public abstract PageableItems findAllActiveDto(int offset, int count);
 
     public abstract PageableItems<T> findAllActive(int offset, int count);
diff --git a/src/main/java/ru/ulstu/activity/conference/model/Conference.java b/src/main/java/ru/ulstu/activity/conference/model/Conference.java
index 7dfecf5..8a34f4e 100644
--- a/src/main/java/ru/ulstu/activity/conference/model/Conference.java
+++ b/src/main/java/ru/ulstu/activity/conference/model/Conference.java
@@ -25,6 +25,7 @@ import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
 import javax.validation.constraints.NotBlank;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
@@ -177,4 +178,9 @@ public class Conference extends AbstractActivity implements EventSource {
     public Set<User> getActivityMembers() {
         return users.stream().map(conferenceUser -> conferenceUser.getUser()).collect(Collectors.toSet());
     }
+
+    @Override
+    public List<Event> getEvents() {
+        return Collections.emptyList();
+    }
 }
diff --git a/src/main/java/ru/ulstu/activity/conference/service/ConferenceService.java b/src/main/java/ru/ulstu/activity/conference/service/ConferenceService.java
index 07c99ec..918d273 100644
--- a/src/main/java/ru/ulstu/activity/conference/service/ConferenceService.java
+++ b/src/main/java/ru/ulstu/activity/conference/service/ConferenceService.java
@@ -2,13 +2,13 @@ package ru.ulstu.activity.conference.service;
 
 import org.springframework.data.domain.Page;
 import org.springframework.stereotype.Service;
-import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.activity.common.service.ActivityService;
 import ru.ulstu.activity.conference.model.Conference;
 import ru.ulstu.activity.conference.model.ConferenceDashboardDto;
 import ru.ulstu.activity.conference.model.ConferenceDto;
 import ru.ulstu.activity.conference.model.ConferenceFilterDto;
 import ru.ulstu.activity.conference.model.ConferenceListDto;
+import ru.ulstu.activity.deadline.model.Deadline;
 import ru.ulstu.activity.deadline.service.DeadlineService;
 import ru.ulstu.activity.paper.service.PaperService;
 import ru.ulstu.activity.ping.service.PingService;
@@ -57,18 +57,6 @@ public class ConferenceService extends ActivityService<ConferenceListDto, Confer
         this.eventService = eventService;
     }
 
-    @Transactional
-    @Override
-    public ConferenceDto update(ConferenceDto conferenceDto) {
-        Conference conference = conferenceRepository.getOne(conferenceDto.getId());
-        try {
-            conferenceRepository.save(copyFromDto(conference, conferenceDto));
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-        return new ConferenceDto(update(conference));
-    }
-
     @Override
     protected ConferenceListDto getActivityListDto(Conference entity) {
         return new ConferenceListDto(entity);
@@ -131,6 +119,34 @@ public class ConferenceService extends ActivityService<ConferenceListDto, Confer
         return conferenceRepository.findActiveByUser(user);
     }
 
+    @Override
+    protected void doActionsOnDiffObjects(Conference oldEntity, Conference entity) {
+        if (!entity.getBeginDate().equals(oldEntity.getBeginDate())
+                || !entity.getEndDate().equals(oldEntity.getEndDate())) {
+            conferenceNotificationService.updateConferencesDatesNotification(entity, oldEntity.getBeginDate(), oldEntity.getEndDate());
+        }
+        entity.getActivityMembers().forEach(author -> {
+            if (!oldEntity.getActivityMembers().contains(author)) {
+                conferenceNotificationService.sendCreateNotification(entity);
+            }
+        });
+        sendNotificationAfterUpdateDeadlines(entity, oldEntity.getDeadlines());
+    }
+
+    private void sendNotificationAfterUpdateDeadlines(Conference conference, List<Deadline> oldDeadlines) {
+        if (oldDeadlines.size() != conference.getDeadlines().size()) {
+            conferenceNotificationService.updateDeadlineNotification(conference);
+            return;
+        }
+
+        if (conference.getDeadlines()
+                .stream()
+                .filter(deadline -> !oldDeadlines.contains(deadline))
+                .count() > 0) {
+            conferenceNotificationService.updateDeadlineNotification(conference);
+        }
+    }
+
     @Override
     protected List<Event> getEvents(Conference entity) {
         return eventService.findByConference(entity);
diff --git a/src/main/java/ru/ulstu/activity/grant/controller/GrantController.java b/src/main/java/ru/ulstu/activity/grant/controller/GrantController.java
index 93fbba8..21b1d9b 100644
--- a/src/main/java/ru/ulstu/activity/grant/controller/GrantController.java
+++ b/src/main/java/ru/ulstu/activity/grant/controller/GrantController.java
@@ -53,7 +53,7 @@ public class GrantController implements ActivityController<GrantListDto, GrantDa
     @Override
     @GetMapping("{grant-id}")
     public Response<GrantDto> get(@PathVariable("grant-id") Integer entityId) {
-        return new Response<>(grantService.findGrantById(entityId));
+        return new Response<>(grantService.findDtoById(entityId));
     }
 
     @Override
diff --git a/src/main/java/ru/ulstu/activity/grant/service/GrantRepository.java b/src/main/java/ru/ulstu/activity/grant/service/GrantRepository.java
index cfc84aa..76961ec 100644
--- a/src/main/java/ru/ulstu/activity/grant/service/GrantRepository.java
+++ b/src/main/java/ru/ulstu/activity/grant/service/GrantRepository.java
@@ -2,15 +2,15 @@ package ru.ulstu.activity.grant.service;
 
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
-import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import ru.ulstu.activity.api.ActivityRepository;
 import ru.ulstu.activity.grant.model.Grant;
+import ru.ulstu.core.repository.JpaDetachableRepository;
 
 import java.util.List;
 
-interface GrantRepository extends JpaRepository<Grant, Integer>, ActivityRepository<Grant> {
+interface GrantRepository extends JpaDetachableRepository<Grant, Integer>, ActivityRepository<Grant> {
 
     List<Grant> findByStatus(Grant.GrantStatus status);
 
diff --git a/src/main/java/ru/ulstu/activity/grant/service/GrantService.java b/src/main/java/ru/ulstu/activity/grant/service/GrantService.java
index d3f3a1c..4b350bd 100644
--- a/src/main/java/ru/ulstu/activity/grant/service/GrantService.java
+++ b/src/main/java/ru/ulstu/activity/grant/service/GrantService.java
@@ -116,6 +116,18 @@ public class GrantService extends ActivityService<GrantListDto, Grant, GrantDto>
         return grant;
     }
 
+    @Override
+    protected void doActionsOnDiffObjects(Grant oldEntity, Grant entity) {
+        entity.getAuthors().forEach(author -> {
+            if (!oldEntity.getAuthors().contains(author)) {
+                grantNotificationService.sendAuthorsChangeNotification(entity, oldEntity.getAuthors());
+            }
+        });
+        if (!entity.getLeader().equals(oldEntity.getLeader())) {
+            grantNotificationService.sendLeaderChangeNotification(entity, oldEntity.getLeader());
+        }
+    }
+
     @Override
     protected List<Event> getEvents(Grant entity) {
         return eventService.findByGrant(entity);
@@ -169,14 +181,6 @@ public class GrantService extends ActivityService<GrantListDto, Grant, GrantDto>
         return new PageableItems<>(activeGrantsPage.getTotalElements(), activeGrantsPage.getContent());
     }
 
-    public GrantDto findGrantById(Integer id) {
-        return new GrantDto(findById(id));
-    }
-
-    public Grant findById(Integer id) {
-        return grantRepository.getOne(id);
-    }
-
     @Transactional
     public void ping(int grantId) {
         pingService.addPing(findById(grantId));
diff --git a/src/main/java/ru/ulstu/activity/paper/controller/PaperController.java b/src/main/java/ru/ulstu/activity/paper/controller/PaperController.java
index 8a3a71f..ff219e8 100644
--- a/src/main/java/ru/ulstu/activity/paper/controller/PaperController.java
+++ b/src/main/java/ru/ulstu/activity/paper/controller/PaperController.java
@@ -47,7 +47,7 @@ public class PaperController implements ActivityController<PaperListDto, PaperDa
 
     @GetMapping("{paper-id}")
     public Response<PaperDto> get(@PathVariable("paper-id") Integer paperId) {
-        return new Response<>(paperService.findPaperById(paperId));
+        return new Response<>(paperService.findDtoById(paperId));
     }
 
     @PostMapping
diff --git a/src/main/java/ru/ulstu/activity/paper/service/PaperService.java b/src/main/java/ru/ulstu/activity/paper/service/PaperService.java
index 3cac351..40e7b48 100644
--- a/src/main/java/ru/ulstu/activity/paper/service/PaperService.java
+++ b/src/main/java/ru/ulstu/activity/paper/service/PaperService.java
@@ -6,12 +6,10 @@ import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.activity.common.service.ActivityService;
 import ru.ulstu.activity.deadline.model.Deadline;
 import ru.ulstu.activity.deadline.service.DeadlineService;
-import ru.ulstu.activity.file.model.FileDataDto;
 import ru.ulstu.activity.file.service.FileService;
 import ru.ulstu.activity.paper.model.Paper;
 import ru.ulstu.activity.paper.model.PaperDashboardDto;
 import ru.ulstu.activity.paper.model.PaperDto;
-import ru.ulstu.activity.paper.model.PaperFilterListDto;
 import ru.ulstu.activity.paper.model.PaperListDto;
 import ru.ulstu.activity.paper.model.PaperStatusDto;
 import ru.ulstu.activity.paper.model.PaperTypeDto;
@@ -23,13 +21,10 @@ import ru.ulstu.core.model.response.PageableItems;
 import ru.ulstu.user.model.User;
 import ru.ulstu.user.service.UserService;
 
-import javax.persistence.EntityNotFoundException;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Date;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 
 import static java.util.stream.Collectors.toList;
 import static org.hibernate.internal.util.collections.CollectionHelper.isNotEmpty;
@@ -53,9 +48,6 @@ public class PaperService extends ActivityService<PaperListDto, Paper, PaperDto>
     private final EventService eventService;
     private final PingService pingService;
 
-    private Paper.PaperStatus oldStatus;
-    private Set<User> oldAuthors;
-
     public PaperService(PaperRepository paperRepository,
                         FileService fileService,
                         PaperNotificationService paperNotificationService,
@@ -108,21 +100,14 @@ public class PaperService extends ActivityService<PaperListDto, Paper, PaperDto>
         return eventService.findByPaper(entity);
     }
 
-    @Transactional
-    public PaperDto update(PaperDto paperDto) {
-        Paper paper = findById(paperDto.getId());
-        oldStatus = paper.getStatus();
-        oldAuthors = new HashSet<>(paper.getAuthors());
-
-        //TODO: move to service
-        if (paperDto.getFiles() != null) {
-            for (FileDataDto file : paperDto.getFiles().stream()
-                    .filter(f -> f.isDeleted() && f.getId() != null)
-                    .collect(toList())) {
-                fileService.delete(file.getId());
-            }
+    @Override
+    protected void doActionsOnDiffObjects(Paper oldEntity, Paper entity) {
+        if (oldEntity.getStatus() != entity.getStatus()) {
+            paperNotificationService.statusChangeNotification(entity, oldEntity.getStatus());
+        }
+        if (!oldEntity.getAuthors().equals(entity.getAuthors())) {
+            paperNotificationService.sendCreateNotification(entity, oldEntity.getAuthors());
         }
-        return new PaperDto(update(copyFromDto(paper, paperDto)));
     }
 
     protected Paper copyFromDto(Paper paper, PaperDto paperDto) {
@@ -152,13 +137,6 @@ public class PaperService extends ActivityService<PaperListDto, Paper, PaperDto>
         return paper;
     }
 
-    @Transactional
-    public boolean delete(Integer paperId) {
-        Paper paper = paperRepository.getOne(paperId);
-        paperRepository.delete(paper);
-        return true;
-    }
-
     public List<PaperStatusDto> getPaperStatuses() {
         return convert(Arrays.asList(Paper.PaperStatus.values()), PaperStatusDto::new);
     }
@@ -181,12 +159,6 @@ public class PaperService extends ActivityService<PaperListDto, Paper, PaperDto>
         return create(paper);
     }
 
-    public List<PaperListDto> filter(PaperFilterListDto filterDto) {
-        return convert(sortPapers(paperRepository.filter(
-                filterDto.getFilterAuthorId() == null ? null : userService.findById(filterDto.getFilterAuthorId()),
-                filterDto.getYear())), PaperListDto::new);
-    }
-
     private List<Paper> sortPapers(List<Paper> papers) {
         return papers.stream().sorted((paper1, paper2) -> {
             int statusCompareResult =
@@ -223,28 +195,7 @@ public class PaperService extends ActivityService<PaperListDto, Paper, PaperDto>
         }
     }
 
-    public PaperDto findPaperById(Integer paperId) {
-        return new PaperDto(findById(paperId));
-    }
-
-    public Paper findById(Integer paperId) {
-        return paperRepository.findById(paperId)
-                .orElseThrow(() -> new EntityNotFoundException("Paper with id=" + paperId + " not found"));
-    }
-
-    public List<PaperDto> findAllNotCompleted() {
-        return convert(paperRepository.findByStatusNot(COMPLETED), PaperDto::new);
-    }
-
-    public List<PaperDto> findAllSelect(List<Integer> paperIds) {
-        return convert(paperRepository.findAllByIdIn(paperIds), PaperDto::new);
-    }
-
     public List<User> getPaperAuthors() {
         return userService.findAll();
     }
-
-    public List<Paper> findAllCompletedByType(Paper.PaperType type) {
-        return paperRepository.findByTypeAndStatus(type, Paper.PaperStatus.COMPLETED);
-    }
 }
diff --git a/src/main/java/ru/ulstu/activity/project/controller/ProjectController.java b/src/main/java/ru/ulstu/activity/project/controller/ProjectController.java
index baf0a9b..9a0b16e 100644
--- a/src/main/java/ru/ulstu/activity/project/controller/ProjectController.java
+++ b/src/main/java/ru/ulstu/activity/project/controller/ProjectController.java
@@ -43,7 +43,7 @@ public class ProjectController implements ActivityController<ProjectListDto, Pro
 
     @GetMapping("{project-id}")
     public Response<ProjectDto> get(@PathVariable("project-id") Integer projectId) {
-        return new Response<>(projectService.findProjectById(projectId));
+        return new Response<>(projectService.findDtoById(projectId));
     }
 
     @PostMapping
diff --git a/src/main/java/ru/ulstu/activity/project/service/ProjectService.java b/src/main/java/ru/ulstu/activity/project/service/ProjectService.java
index d0b1087..79c9d47 100644
--- a/src/main/java/ru/ulstu/activity/project/service/ProjectService.java
+++ b/src/main/java/ru/ulstu/activity/project/service/ProjectService.java
@@ -56,6 +56,11 @@ public class ProjectService extends ActivityService<ProjectListDto, Project, Pro
         return new PageableItems<>(activeProjectPage.getTotalElements(), activeProjectPage.getContent());
     }
 
+    @Override
+    protected void doActionsOnDiffObjects(Project oldEntity, Project entity) {
+        //TODO
+    }
+
     @Override
     protected List<Event> getEvents(Project entity) {
         return eventService.findByProject(entity);
@@ -88,8 +93,4 @@ public class ProjectService extends ActivityService<ProjectListDto, Project, Pro
     protected ProjectDto getNewActivityDto(Project entity) {
         return new ProjectDto(entity);
     }
-
-    public ProjectDto findProjectById(Integer projectId) {
-        return getNewActivityDto(findById(projectId));
-    }
 }
\ No newline at end of file
diff --git a/src/main/java/ru/ulstu/activity/students/controller/TaskController.java b/src/main/java/ru/ulstu/activity/students/controller/TaskController.java
index 8be575f..8cf808a 100644
--- a/src/main/java/ru/ulstu/activity/students/controller/TaskController.java
+++ b/src/main/java/ru/ulstu/activity/students/controller/TaskController.java
@@ -44,7 +44,7 @@ public class TaskController implements ActivityController<TaskListDto, TaskDashb
 
     @GetMapping("{task-id}")
     public Response<TaskDto> get(@PathVariable("task-id") Integer taskId) {
-        return new Response<>(taskService.findTaskById(taskId));
+        return new Response<>(taskService.findDtoById(taskId));
     }
 
     @PostMapping
diff --git a/src/main/java/ru/ulstu/activity/students/model/Task.java b/src/main/java/ru/ulstu/activity/students/model/Task.java
index f893ed2..4ae6a56 100644
--- a/src/main/java/ru/ulstu/activity/students/model/Task.java
+++ b/src/main/java/ru/ulstu/activity/students/model/Task.java
@@ -110,6 +110,11 @@ public class Task extends AbstractActivity implements EventSource {
         return Collections.emptySet();
     }
 
+    @Override
+    public List<Event> getEvents() {
+        return Collections.emptyList();
+    }
+
     public TaskStatus getStatus() {
         return status;
     }
diff --git a/src/main/java/ru/ulstu/activity/students/service/TaskService.java b/src/main/java/ru/ulstu/activity/students/service/TaskService.java
index 48c4dbe..5b1a62f 100644
--- a/src/main/java/ru/ulstu/activity/students/service/TaskService.java
+++ b/src/main/java/ru/ulstu/activity/students/service/TaskService.java
@@ -1,7 +1,6 @@
 package ru.ulstu.activity.students.service;
 
 import org.springframework.data.domain.Page;
-import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.activity.common.service.ActivityService;
@@ -12,7 +11,6 @@ import ru.ulstu.activity.students.model.Scheduler;
 import ru.ulstu.activity.students.model.Task;
 import ru.ulstu.activity.students.model.TaskDashboardDto;
 import ru.ulstu.activity.students.model.TaskDto;
-import ru.ulstu.activity.students.model.TaskFilterDto;
 import ru.ulstu.activity.students.model.TaskListDto;
 import ru.ulstu.activity.tags.model.Tag;
 import ru.ulstu.activity.tags.service.TagService;
@@ -22,7 +20,6 @@ import ru.ulstu.core.jpa.OffsetablePageRequest;
 import ru.ulstu.core.model.response.PageableItems;
 import ru.ulstu.core.util.DateUtils;
 
-import javax.persistence.EntityNotFoundException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
@@ -34,7 +31,6 @@ import java.util.TreeMap;
 import java.util.stream.Collectors;
 
 import static ru.ulstu.activity.students.model.Task.TaskStatus.IN_WORK;
-import static ru.ulstu.core.util.StreamApiUtils.convert;
 import static ru.ulstu.core.util.StreamApiUtils.convertPageable;
 
 @Service
@@ -65,10 +61,6 @@ public class TaskService extends ActivityService<TaskListDto, Task, TaskDto> {
         this.pingService = pingService;
     }
 
-    public List<Task> findAll() {
-        return taskRepository.findAll(new Sort(Sort.Direction.DESC, "createDate"));
-    }
-
     public PageableItems<Task> findAll(int offset, int count) {
         final Page<Task> page = taskRepository.findAll(new OffsetablePageRequest(offset, count));
         return new PageableItems<>(page.getTotalElements(), page.getContent());
@@ -89,18 +81,6 @@ public class TaskService extends ActivityService<TaskListDto, Task, TaskDto> {
         return new TaskDto(entity);
     }
 
-    public List<TaskDto> filter(TaskFilterDto filterDto) {
-        if (filterDto.getOrder().compareTo("new") == 0) {
-            return convert(taskRepository.filterNew(
-                    filterDto.getStatus(),
-                    filterDto.getTag() == null ? null : tagService.findById(filterDto.getTag())), TaskDto::new);
-        } else {
-            return convert(taskRepository.filterOld(
-                    filterDto.getStatus(),
-                    filterDto.getTag() == null ? null : tagService.findById(filterDto.getTag())), TaskDto::new);
-        }
-    }
-
     protected Task copyFromDto(Task task, TaskDto taskDto) {
         task.setTitle(taskDto.getTitle());
         task.setDescription(taskDto.getDescription());
@@ -113,6 +93,11 @@ public class TaskService extends ActivityService<TaskListDto, Task, TaskDto> {
         return task;
     }
 
+    @Override
+    protected void doActionsOnDiffObjects(Task oldEntity, Task entity) {
+        //TODO
+    }
+
     @Override
     protected List<Event> getEvents(Task entity) {
         return eventService.findByTask(entity);
@@ -252,19 +237,4 @@ public class TaskService extends ActivityService<TaskListDto, Task, TaskDto> {
     public PageableItems<Task> findAllActive(int offset, int count) {
         return findAll(offset, count);
     }
-
-    public TaskDto findTaskById(Integer taskId) {
-        return new TaskDto(findById(taskId));
-    }
-
-    public Task findById(Integer taskId) {
-        return taskRepository.findById(taskId)
-                .orElseThrow(() -> new EntityNotFoundException("Paper with id=" + taskId + " not found"));
-    }
-
-
-    @Transactional
-    public void ping(int taskId) {
-        pingService.addPing(findById(taskId));
-    }
 }
diff --git a/src/main/java/ru/ulstu/activity/timeline/service/EventService.java b/src/main/java/ru/ulstu/activity/timeline/service/EventService.java
index 99d49b4..a9a3f7d 100644
--- a/src/main/java/ru/ulstu/activity/timeline/service/EventService.java
+++ b/src/main/java/ru/ulstu/activity/timeline/service/EventService.java
@@ -68,7 +68,6 @@ public class EventService {
                     + eventSource.getTitle() + "'");
             eventSource.addObjectToEvent(newEvent);
             newEvent.setRecipients(eventSource.getRecipients());
-            newEvents.add(eventRepository.save(newEvent));
         }
         eventRepository.saveAll(newEvents);
     }