Feature/event project kafka done! (Close #14)

pom.xml

@@ -72,6 +72,12 @@
             <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
         </dependency>
 
+        <!-- Message Broker -->
+        <dependency>
+            <groupId>org.springframework.kafka</groupId>
+            <artifactId>spring-kafka</artifactId>
+        </dependency>
+
         <!-- Caching -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -106,6 +112,11 @@
             <groupId>org.springframework.security</groupId>
             <artifactId>spring-security-test</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.kafka</groupId>
+            <artifactId>spring-kafka-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <dependencyManagement>

src/main/java/com/seyed/ali/timeentryservice/event/ProjectEventListener.java

@@ -0,0 +1,33 @@
+package com.seyed.ali.timeentryservice.event;
+
+import com.seyed.ali.timeentryservice.model.enums.OperationType;
+import com.seyed.ali.timeentryservice.model.payload.ProjectDTO;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.stereotype.Service;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class ProjectEventListener {
+
+    private final ProjectEventService projectEventService;
+
+    @KafkaListener(
+            topics = "${spring.kafka.topic.name}",
+            groupId = "${spring.kafka.consumer.group-id}" // if we change the group-id name, the events from the previous data will also be logged, otherwise, only the new events will be logged!
+    )
+    public void handleProjectEvent(@Payload ConsumerRecord<String, ProjectDTO> record, @Header("OperationType") String operationType) {
+        ProjectDTO projectDTO = record.value();
+        switch (OperationType.valueOf(operationType)) {
+            case DELETE -> this.projectEventService.handleDeleteOperation(projectDTO);
+            case DETACH -> this.projectEventService.handleDetachOperation(projectDTO);
+            default -> log.warn("\"{}\" operation type not supported.", operationType);
+        }
+    }
+
+}

src/main/java/com/seyed/ali/timeentryservice/event/ProjectEventService.java

@@ -0,0 +1,36 @@
+package com.seyed.ali.timeentryservice.event;
+
+import com.seyed.ali.timeentryservice.model.payload.ProjectDTO;
+import com.seyed.ali.timeentryservice.repository.TimeEntryRepository;
+import com.seyed.ali.timeentryservice.service.interfaces.TimeEntryService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class ProjectEventService {
+
+    private final TimeEntryService timeEntryService;
+    private final TimeEntryRepository timeEntryRepository;
+
+    public void handleDeleteOperation(ProjectDTO projectDTO) {
+        log.info("\"Delete\" project, associated tasks & time entries: {}", projectDTO);
+        this.timeEntryRepository.findByProjectId(projectDTO.getProjectId())
+                .forEach(this.timeEntryService::deleteTimeEntry);
+    }
+
+    public void handleDetachOperation(ProjectDTO projectDTO) {
+        log.info("\"Detach\" project, associated tasks & time entries: {}", projectDTO);
+        this.timeEntryRepository.findByProjectId(projectDTO.getProjectId())
+                .forEach(timeEntry -> {
+                    timeEntry.setProjectId(null);
+                    timeEntry.setTaskId(null);
+                    this.timeEntryRepository.save(timeEntry);
+                });
+    }
+
+}

src/main/java/com/seyed/ali/timeentryservice/model/enums/OperationType.java

@@ -0,0 +1,7 @@
+package com.seyed.ali.timeentryservice.model.enums;
+
+public enum OperationType {
+
+    DELETE, DETACH
+
+}

src/main/java/com/seyed/ali/timeentryservice/model/payload/ProjectDTO.java

@@ -0,0 +1,39 @@
+package com.seyed.ali.timeentryservice.model.payload;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * DTO for {@link com.seyed.ali.projectservice.model.domain.Project}
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class ProjectDTO implements Serializable {
+
+        @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Unique identifier for the project", example = "12345")
+        private String projectId;
+
+        @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "The project name", example = "Microservices-Springboot")
+        private String projectName;
+
+        @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "The project name", example = "Learning microservices is really exciting and HARD ;)")
+        private String projectDescription;
+
+        @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "The task associated with the project", implementation = TaskDTO.class)
+        private List<TaskDTO> taskDTO = new ArrayList<>();
+
+        public ProjectDTO(String projectId, String projectName, String projectDescription) {
+                this.projectId = projectId;
+                this.projectName = projectName;
+                this.projectDescription = projectDescription;
+                this.taskDTO = new ArrayList<>();
+        }
+
+}

src/main/java/com/seyed/ali/timeentryservice/repository/TimeEntryRepository.java

@@ -3,6 +3,7 @@
 import com.seyed.ali.timeentryservice.model.domain.TimeEntry;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.List;
 import java.util.Optional;
 
 public interface TimeEntryRepository extends JpaRepository<TimeEntry, String> {
@@ -11,4 +12,8 @@ public interface TimeEntryRepository extends JpaRepository<TimeEntry, String> {
 
     TimeEntry findByUserIdAndTimeEntryId(String userId, String timeEntryId);
 
+    List<TimeEntry> findByProjectId(String projectId);
+
+    List<TimeEntry> findByTaskId(String taskId);
+
 }

src/main/java/com/seyed/ali/timeentryservice/service/TimeEntryServiceImpl.java

@@ -113,4 +113,19 @@ public void deleteTimeEntry(String timeEntryId) {
         this.timeEntryRepository.deleteById(timeEntryId);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @Transactional
+    @CacheEvict(
+            cacheNames = TimeEntryCacheManager.TIME_ENTRY_CACHE,
+            key = "#timeEntry.timeEntryId"
+    )
+    public void deleteTimeEntry(TimeEntry timeEntry) {
+        TimeEntry foundTimeEntry = this.timeEntryRepository.findById(timeEntry.getTimeEntryId())
+                .orElseThrow(() -> new ResourceNotFoundException("The provided timeEntryId does not exist"));
+        this.timeEntryRepository.delete(foundTimeEntry);
+    }
+
 }

src/main/java/com/seyed/ali/timeentryservice/service/interfaces/TimeEntryService.java

@@ -55,10 +55,17 @@ public interface TimeEntryService {
     TimeEntry updateTimeEntryManually(String id, TimeEntryDTO timeEntryDTO);
 
     /**
-     * Deletes a time entry.
+     * Deletes a time entry by ID.
      *
      * @param timeEntryId The ID of the time entry to be deleted.
      */
     void deleteTimeEntry(String timeEntryId);
 
+    /**
+     * Deletes a time entry.
+     *
+     * @param timeEntry The time entry to be deleted.
+     */
+    void deleteTimeEntry(TimeEntry timeEntry);
+
 }

src/main/resources/application-dev.yml

@@ -70,4 +70,23 @@ authentication:
   service:
     user-persistence-controller:
       base-url: http://${AUTHENTICATION_SERVICE_HANDLE_USER_BASE_URL:localhost:8081}/keycloak-user
-      handle-user-url: /handle-user
+      handle-user-url: /handle-user
+
+--- # Kafka
+spring:
+  kafka:
+    consumer:
+      bootstrap-servers: localhost:9092
+      group-id: project_group_timeentry
+      auto-offset-reset: earliest
+
+      #configure deserialize classes for key & value pair
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
+      properties:
+        spring.json.trusted.packages: "*"
+        spring.json.type.mapping: ProjectEvent:com.seyed.ali.timeentryservice.model.payload.ProjectDTO
+
+        #custom
+    topic:
+      name: project_name

src/test/resources/application-test.yml

@@ -38,4 +38,23 @@ authentication:
   service:
     user-persistence-controller:
       base-url: http://${AUTHENTICATION_SERVICE_HANDLE_USER_BASE_URL:localhost:8081}/keycloak-user
-      handle-user-url: /handle-user
+      handle-user-url: /handle-user
+
+--- # Kafka
+spring:
+  kafka:
+    consumer:
+      bootstrap-servers: localhost:9092
+      group-id: project_group_timeentry
+      auto-offset-reset: earliest
+
+      #configure deserialize classes for key & value pair
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
+      properties:
+        spring.json.trusted.packages: "*"
+        spring.json.type.mapping: ProjectEvent:com.seyed.ali.timeentryservice.model.payload.ProjectDTO
+
+        #custom
+    topic:
+      name: project_name