diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/CommentsManager.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/CommentsManager.java
index b0e0f4bd822..d3bccd0c3c5 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/CommentsManager.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/CommentsManager.java
@@ -18,9 +18,89 @@
  */
 package org.wso2.carbon.device.application.mgt.common.services;
 
+import org.wso2.carbon.device.application.mgt.common.Comment;
+import org.wso2.carbon.device.application.mgt.common.PaginationRequest;
+import org.wso2.carbon.device.application.mgt.common.PaginationResult;
+import org.wso2.carbon.device.application.mgt.common.exception.ApplicationManagementException;
+import org.wso2.carbon.device.application.mgt.common.exception.CommentManagementException;
+import org.wso2.carbon.device.application.mgt.common.exception.DBConnectionException;
+
+import java.sql.SQLException;
+
 /**
  * CommentsManager is responsible for handling all the add/update/delete/get operations related with
- * {@link org.wso2.carbon.device.application.mgt.common.Comment}.
+ *
  */
 public interface CommentsManager {
+
+    /**
+     * To add a comment to a application
+     *
+     * @param comment comment of the application.
+     * @param uuid uuid of the application release
+     * @param tenantId tenant id of the application
+     * @return {@link Comment}
+     * @throws CommentManagementException Exceptions of the comment management.
+     */
+
+    /**
+     * Get all comments to pagination
+     *
+     *@param request Pagination request
+     * @param uuid uuid of the application release
+     * @return {@link PaginationResult} pagination result with starting index and limit
+     * @throws CommentManagementException Exceptions of the comment management.
+     * @throws SQLException SQL Exception
+     */
+    PaginationResult getAllComments(PaginationRequest request,String uuid) throws CommentManagementException, SQLException;
+
+    /**
+     * To get the comment with id.
+     *
+     * @param apAppCommentId id of the comment
+     * @return Comment of the comment id
+     * @throws CommentManagementException Exceptions of the comment management.
+     */
+    Comment getComment(int apAppCommentId)throws CommentManagementException;
+
+
+    /**
+     * To update a comment.
+     *
+     * @param comment comment of the application.
+     * @param apAppCommentId id of the comment
+     * @return updated comment
+     * @throws CommentManagementException Exceptions of the comment management
+     * @throws SQLException SQL Exception
+     * @throws DBConnectionException Database connection Exception
+     */
+    Comment updateComment(Comment comment,int apAppCommentId) throws CommentManagementException, SQLException, DBConnectionException;
+
+    /**
+     * To get the average of stars
+     *
+     * @param uuid uuid of the comment
+     * @return value of the stars of an application
+     * @throws SQLException sql exception
+     */
+    int getStars(String uuid)throws SQLException;
+
+    /**
+     * To update rating stars
+     *
+     * @param stars amount of stars
+     * @param uuid uuid of the application
+     * @return value of the added stars
+     * @throws ApplicationManagementException Application Management Exception.
+     */
+    int updateStars(int stars, String uuid) throws ApplicationManagementException;
+
+    /**
+     * To get number of rated users
+     *
+     * @param uuid uuid of the application
+     * @return number of rated users
+     * @throws SQLException sql exception
+     */
+    int getRatedUser(String uuid)throws SQLException;
 }