Fix for sycning status update in Android

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/device/details/DeviceMonitoringData.java

@@ -0,0 +1,57 @@
+/*
+ *   Copyright (c) 2021, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ *   Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ *   Version 2.0 (the "License"); you may not use this file except
+ *   in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing,
+ *   software distributed under the License is distributed on an
+ *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *   KIND, either express or implied.  See the License for the
+ *   specific language governing permissions and limitations
+ *   under the License.
+ */
+
+
+package org.wso2.carbon.device.mgt.common.device.details;
+
+import org.wso2.carbon.device.mgt.common.Device;
+
+import java.io.Serializable;
+
+public class DeviceMonitoringData implements Serializable {
+
+    private static final long serialVersionUID = 2448141793L;
+    long lastUpdatedTime;
+    Device device;
+    int tenantId;
+
+    public int getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(int tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public Device getDevice() {
+        return device;
+    }
+
+    public void setDevice(Device device) {
+        this.device = device;
+    }
+
+    public long getLastUpdatedTime() {
+        return lastUpdatedTime;
+    }
+
+    public void setLastUpdatedTime(long lastUpdatedTime) {
+        this.lastUpdatedTime = lastUpdatedTime;
+    }
+}
+

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/DeviceDAO.java

@@ -45,6 +45,7 @@ import org.wso2.carbon.device.mgt.common.Count;
 import org.wso2.carbon.device.mgt.common.configuration.mgt.DevicePropertyInfo;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceData;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceLocationHistorySnapshot;
+import org.wso2.carbon.device.mgt.common.device.details.DeviceMonitoringData;
 import org.wso2.carbon.device.mgt.core.dto.DeviceType;
 import org.wso2.carbon.device.mgt.core.geo.GeoCluster;
 import org.wso2.carbon.device.mgt.core.geo.geoHash.GeoCoordinate;
@@ -682,6 +683,19 @@ public interface DeviceDAO {
     int getCountOfDeviceExpiredByOSVersion(String deviceType, Long osValue, int tenantId)
             throws DeviceManagementDAOException;
 
+    /**
+     * Get All devices for monitoring
+     * @param deviceTypeId device type identifier
+     * @param deviceTypeName name of the type. (android, ios ...)
+     * @param activeServerCount Number of available servers
+     * @param serverHashIndex server index number
+     * @return device object
+     * @throws DeviceManagementDAOException
+     */
+    List<DeviceMonitoringData> getAllDevicesForMonitoring(int deviceTypeId, String deviceTypeName,
+                                                          int activeServerCount, int serverHashIndex)
+            throws DeviceManagementDAOException;
+
     /**
      * Get a paginated list of devices filtered by given encryption status
      *

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/AbstractDeviceDAOImpl.java

@@ -47,6 +47,7 @@ import org.wso2.carbon.device.mgt.common.PaginationRequest;
 import org.wso2.carbon.device.mgt.common.configuration.mgt.DevicePropertyInfo;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceData;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceLocationHistorySnapshot;
+import org.wso2.carbon.device.mgt.common.device.details.DeviceMonitoringData;
 import org.wso2.carbon.device.mgt.core.dao.DeviceDAO;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOException;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOFactory;
@@ -2784,4 +2785,56 @@ public abstract class AbstractDeviceDAOImpl implements DeviceDAO {
         }
         return deviceCount;
     }
+
+    @Override
+    public List<DeviceMonitoringData> getAllDevicesForMonitoring(
+            int deviceTypeId, String deviceTypeName, int activeServerCount, int serverHashIndex)
+            throws DeviceManagementDAOException {
+        List<DeviceMonitoringData> devices = new ArrayList<>();
+
+        String sql = "SELECT D.ID AS DEVICE_ID," +
+                " D.NAME AS DEVICE_NAME, " +
+                " D.DESCRIPTION AS DESCRIPTION," +
+                " D.DEVICE_IDENTIFICATION, " +
+                " D.LAST_UPDATED_TIMESTAMP, " +
+                " D.TENANT_ID, " +
+                " E.ENROLMENT_ID, " +
+                " EN.OWNER, " +
+                " EN.OWNERSHIP, " +
+                " EN.IS_TRANSFERRED, " +
+                " EN.DATE_OF_ENROLMENT, " +
+                " EN.DATE_OF_LAST_UPDATE, " +
+                " EN.STATUS " +
+                "FROM DM_DEVICE D, DM_ENROLMENT EN," +
+                " (SELECT DEVICE_ID, MAX(ID) AS ENROLMENT_ID" +
+                " FROM DM_ENROLMENT" +
+                " WHERE STATUS IN ('ACTIVE', 'UNREACHABLE') " +
+                " GROUP BY DEVICE_ID) E" +
+                " WHERE D.ID = E.DEVICE_ID AND E.ENROLMENT_ID = EN.ID AND D.DEVICE_TYPE_ID = ?";
+        if (activeServerCount > 0) {
+            sql += " AND MOD(D.ID, ?) = ?";
+        }
+
+        try {
+            Connection conn = this.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, deviceTypeId);
+                if (activeServerCount > 0) {
+                    stmt.setInt(2, activeServerCount);
+                    stmt.setInt(3, serverHashIndex);
+                }
+
+                try (ResultSet rs = stmt.executeQuery()) {
+                    while (rs.next()) {
+                        devices.add(DeviceManagementDAOUtil.loadDevice(rs, deviceTypeName));
+                    }
+                    return devices;
+                }
+            }
+        } catch (SQLException e) {
+            String msg = "Error occurred while retrieving devices";
+            log.error(msg, e);
+            throw new DeviceManagementDAOException(msg, e);
+        }
+    }
 }

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/util/DeviceManagementDAOUtil.java

@@ -26,6 +26,7 @@ import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.EnrolmentInfo;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceInfo;
 import org.wso2.carbon.device.mgt.common.device.details.DeviceLocationHistorySnapshot;
+import org.wso2.carbon.device.mgt.common.device.details.DeviceMonitoringData;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOException;
 import org.wso2.carbon.device.mgt.core.dto.DeviceType;
 import org.wso2.carbon.device.mgt.core.internal.DeviceManagementDataHolder;
@@ -196,6 +197,23 @@ public final class DeviceManagementDAOUtil {
         return device;
     }
 
+    public static DeviceMonitoringData loadDevice(ResultSet rs, String deviceTypeName) throws SQLException {
+        Device device = new Device();
+        device.setId(rs.getInt("DEVICE_ID"));
+        device.setName(rs.getString("DEVICE_NAME"));
+        device.setDescription(rs.getString("DESCRIPTION"));
+        device.setType(deviceTypeName);
+        device.setDeviceIdentifier(rs.getString("DEVICE_IDENTIFICATION"));
+        device.setEnrolmentInfo(loadEnrolment(rs));
+
+        DeviceMonitoringData deviceMonitoringData = new DeviceMonitoringData();
+        deviceMonitoringData.setLastUpdatedTime(rs
+                .getTimestamp("LAST_UPDATED_TIMESTAMP").getTime());
+        deviceMonitoringData.setTenantId(rs.getInt("TENANT_ID"));
+        deviceMonitoringData.setDevice(device);
+        return deviceMonitoringData;
+    }
+
     //This method will retrieve most appropriate device information when there are multiple device enrollments for
     //a single device. Here we'll consider only active status.
     public static Device loadActiveDevice(ResultSet rs, boolean deviceInfoIncluded) throws SQLException {

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/OperationMappingDAO.java

@@ -19,13 +19,10 @@
 package org.wso2.carbon.device.mgt.core.operation.mgt.dao;
 
 import org.wso2.carbon.device.mgt.common.Device;
-import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.core.dto.operation.mgt.Operation;
-import org.wso2.carbon.device.mgt.core.operation.mgt.OperationEnrolmentMapping;
 import org.wso2.carbon.device.mgt.core.operation.mgt.OperationMapping;
 
 import java.util.List;
-import java.util.Map;
 
 public interface OperationMappingDAO {
 
@@ -41,63 +38,5 @@ public interface OperationMappingDAO {
     void updateOperationMapping(List<OperationMapping> operationMappingList) throws
             OperationManagementDAOException;
 
-    /**
-     * This method returns first pending/repeated operation available for each active enrolment of given device-type
-     * where the operation was created after the given timestamp.
-     *
-     * @param minDuration - Upper limit of Operation created time
-     * @param maxDuration - Lower limit of Operation created time
-     * @param deviceTypeId - Device Type Id of required devices
-     * @return List<OperationEnrolmentMapping> - List of OperationEnrolmentMapping objects containing required data
-     * @throws OperationManagementDAOException
-     */
-    List<OperationEnrolmentMapping> getFirstPendingOperationMappingsForActiveEnrolments(long minDuration,
-                                                                                        long maxDuration, int deviceTypeId)
-            throws OperationManagementDAOException;
-
-
-    /**
-     * This method returns first pending/repeated operation available for each active enrolment of given device-type
-     * in a task partitioned execution scenario
-     * where the operation was created after the given timestamp.
-     *
-     * @param minDuration
-     * @param maxDuration
-     * @param deviceTypeId
-     * @param activeServerCount
-     * @param serverHashIndex
-     * @return
-     */
-    List<OperationEnrolmentMapping> getFirstPendingOperationMappingsForActiveEnrolments(long minDuration,
-                                                                                        long maxDuration, int deviceTypeId,
-                                                                                        int activeServerCount, int serverHashIndex)
-            throws OperationManagementDAOException;
-
-    /**
-     * This method returns the timestamp of last completed Operation for each active enrolment of given device-type
-     * where the operation was completed after the given timestamp.
-     *
-     * @param timeStamp - Timestamp of considered time-interval
-     * @param deviceTypeId - Device Type of required devices
-     * @return List<OperationEnrolmentMapping> - List of OperationEnrolmentMapping objects containing required data
-     * @throws OperationManagementDAOException
-     */
-    Map<Integer, Long> getLastConnectedTimeForActiveEnrolments(long timeStamp, int deviceTypeId)
-            throws OperationManagementDAOException;
-
-
-    /**
-     * This method returns the timestamp of last completed Operation for each active enrolment of given device-type
-     * in a task partitioned execution scenario
-     * where the operation was completed after the given timestamp.
-     *
-     * @param timeStamp
-     * @param deviceTypeId
-     * @param activeServerCount
-     * @param serverHashIndex
-     * @return
-     */
-    Map<Integer, Long> getLastConnectedTimeForActiveEnrolments(long timeStamp, int deviceTypeId, int activeServerCount, int serverHashIndex)
-            throws OperationManagementDAOException;
 
 }

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationMappingDAOImpl.java

@@ -194,154 +194,6 @@ public class OperationMappingDAOImpl implements OperationMappingDAO {
         }
     }
 
-    @Override
-    public List<OperationEnrolmentMapping> getFirstPendingOperationMappingsForActiveEnrolments(long minDuration,
-                                   long maxDuration, int deviceTypeId) throws OperationManagementDAOException {
-        PreparedStatement stmt = null;
-        ResultSet rs = null;
-        List<OperationEnrolmentMapping> enrolmentOperationMappingList;
-        try {
-            Connection conn = OperationManagementDAOFactory.getConnection();
-            //We are specifically looking for operation mappings in 'Pending' & 'Repeated' states. Further we want
-            //devices to be active at that moment. Hence filtering by 'ACTIVE' & 'UNREACHABLE' device states.
-            String sql = "SELECT ENROLMENT_ID, D.DEVICE_IDENTIFICATION AS DEVICE_IDENTIFIER, MIN(CREATED_TIMESTAMP) " +
-                    "AS CREATED_TIMESTAMP, E.STATUS AS ENROLMENT_STATUS, E.TENANT_ID FROM " +
-                    "DM_ENROLMENT_OP_MAPPING OP INNER JOIN DM_ENROLMENT E ON OP.ENROLMENT_ID = E.ID INNER JOIN " +
-                    "DM_DEVICE D ON E.DEVICE_ID = D.ID WHERE " +
-                    "OP.STATUS IN ('"+ Operation.Status.PENDING.name() + "','" + Operation.Status.REPEATED.name() + "') " +
-                    "AND OP.CREATED_TIMESTAMP BETWEEN ? AND ? AND E.STATUS IN ('" + EnrolmentInfo.Status.ACTIVE.name() +
-                    "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? GROUP BY ENROLMENT_ID," +
-                    " D.DEVICE_IDENTIFICATION, E.STATUS, E.TENANT_ID";
-            stmt = conn.prepareStatement(sql);
-            stmt.setLong(1, maxDuration);
-            stmt.setLong(2, minDuration);
-            stmt.setInt(3, deviceTypeId);
-            rs = stmt.executeQuery();
-            enrolmentOperationMappingList = new ArrayList<>();
-            while (rs.next()) {
-                OperationEnrolmentMapping enrolmentOperationMapping = this.getEnrolmentOpMapping(rs);
-                enrolmentOperationMappingList.add(enrolmentOperationMapping);
-            }
-        } catch (SQLException e) {
-            throw new OperationManagementDAOException("Error occurred while fetching pending operation mappings for " +
-                    "active devices of type '" + deviceTypeId + "'", e);
-        } finally {
-            OperationManagementDAOUtil.cleanupResources(stmt, rs);
-        }
-        return enrolmentOperationMappingList;
-    }
-
-    @Override
-    public List<OperationEnrolmentMapping> getFirstPendingOperationMappingsForActiveEnrolments(
-            long minDuration,
-            long maxDuration, int deviceTypeId,
-            int activeServerCount, int serverHashIndex) throws OperationManagementDAOException {
-        List<OperationEnrolmentMapping> enrolmentOperationMappingList;
-        try {
-            Connection conn = OperationManagementDAOFactory.getConnection();
-            //We are specifically looking for operation mappings in 'Pending' & 'Repeated' states. Further we want
-            //devices to be active at that moment. Hence filtering by 'ACTIVE' & 'UNREACHABLE' device states.
-            String sql = "SELECT ENROLMENT_ID, D.DEVICE_IDENTIFICATION AS DEVICE_IDENTIFIER, MIN(CREATED_TIMESTAMP) " +
-                         "AS CREATED_TIMESTAMP, E.STATUS AS ENROLMENT_STATUS, E.TENANT_ID FROM " +
-                         "DM_ENROLMENT_OP_MAPPING OP INNER JOIN DM_ENROLMENT E ON OP.ENROLMENT_ID = E.ID INNER JOIN " +
-                         "DM_DEVICE D ON E.DEVICE_ID = D.ID WHERE " +
-                         "OP.STATUS IN ('" + Operation.Status.PENDING.name() + "','" + Operation.Status.REPEATED.name() + "') " +
-                         "AND OP.CREATED_TIMESTAMP BETWEEN ? AND ? AND E.STATUS IN ('" + EnrolmentInfo.Status.ACTIVE.name() +
-                         "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? AND MOD(D.ID, ?) = ? GROUP BY ENROLMENT_ID," +
-                         " D.DEVICE_IDENTIFICATION, E.STATUS, E.TENANT_ID";
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
-                stmt.setLong(1, maxDuration);
-                stmt.setLong(2, minDuration);
-                stmt.setInt(3, deviceTypeId);
-                stmt.setInt(4, activeServerCount);
-                stmt.setInt(5, serverHashIndex);
-                try (ResultSet rs = stmt.executeQuery()) {
-                    enrolmentOperationMappingList = new ArrayList<>();
-                    while (rs.next()) {
-                        OperationEnrolmentMapping enrolmentOperationMapping = this.getEnrolmentOpMapping(rs);
-                        enrolmentOperationMappingList.add(enrolmentOperationMapping);
-                    }
-                }
-            }
-        } catch (SQLException e) {
-            String msg = "Error occurred while fetching pending operation mappings for " +
-                         "active devices of type '" + deviceTypeId + "'";
-            log.error(msg, e);
-            throw new OperationManagementDAOException(msg, e);
-        }
-        return enrolmentOperationMappingList;
-    }
-
-    @Override
-    public Map<Integer, Long> getLastConnectedTimeForActiveEnrolments(long timeStamp, int deviceTypeId) throws OperationManagementDAOException {
-        PreparedStatement stmt = null;
-        ResultSet rs = null;
-        Map<Integer, Long> lastConnectedTimeMap = null;
-        try {
-            Connection conn = OperationManagementDAOFactory.getConnection();
-            //We are specifically looking for operation mappings in 'Pending' & 'Repeated' states. Further we want
-            //devices to be active at that moment. Hence filtering by 'ACTIVE' & 'UNREACHABLE' device states.
-            String sql = "SELECT OP.ENROLMENT_ID AS EID, MAX(OP.UPDATED_TIMESTAMP) AS LAST_CONNECTED_TIME FROM " +
-                    "DM_ENROLMENT_OP_MAPPING OP INNER JOIN DM_ENROLMENT E ON OP.ENROLMENT_ID = E.ID INNER JOIN " +
-                    "DM_DEVICE D ON E.DEVICE_ID = D.ID WHERE " +
-                    "OP.STATUS = '" + Operation.Status.COMPLETED.name() + "'" +
-                    "AND OP.UPDATED_TIMESTAMP >= ? AND E.STATUS IN ('" + EnrolmentInfo.Status.ACTIVE.name() +
-                    "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? GROUP BY ENROLMENT_ID";
-            stmt = conn.prepareStatement(sql);
-            stmt.setLong(1, timeStamp);
-            stmt.setInt(2, deviceTypeId);
-            rs = stmt.executeQuery();
-            lastConnectedTimeMap = new HashMap<>();
-            while (rs.next()) {
-                lastConnectedTimeMap.put(rs.getInt("EID"), rs.getLong("LAST_CONNECTED_TIME"));
-            }
-        } catch (SQLException e) {
-            throw new OperationManagementDAOException("Error occurred while fetching last connected time for " +
-                    "active devices of type '" + deviceTypeId + "'", e);
-        } finally {
-            OperationManagementDAOUtil.cleanupResources(stmt, rs);
-        }
-        return lastConnectedTimeMap;
-    }
-
-    @Override
-    public Map<Integer, Long> getLastConnectedTimeForActiveEnrolments(long timeStamp,
-                                                                      int deviceTypeId,
-                                                                      int activeServerCount,
-                                                                      int serverHashIndex)
-            throws OperationManagementDAOException {
-        Map<Integer, Long> lastConnectedTimeMap = null;
-        try {
-            Connection conn = OperationManagementDAOFactory.getConnection();
-            //We are specifically looking for operation mappings in 'Pending' & 'Repeated' states. Further we want
-            //devices to be active at that moment. Hence filtering by 'ACTIVE' & 'UNREACHABLE' device states.
-            String sql = "SELECT OP.ENROLMENT_ID AS EID, MAX(OP.UPDATED_TIMESTAMP) AS LAST_CONNECTED_TIME FROM " +
-                         "DM_ENROLMENT_OP_MAPPING OP INNER JOIN DM_ENROLMENT E ON OP.ENROLMENT_ID = E.ID INNER JOIN " +
-                         "DM_DEVICE D ON E.DEVICE_ID = D.ID WHERE " +
-                         "OP.STATUS = '" + Operation.Status.COMPLETED.name() + "'" +
-                         "AND OP.UPDATED_TIMESTAMP >= ? AND E.STATUS IN ('" + EnrolmentInfo.Status.ACTIVE.name() +
-                         "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? AND MOD(D.ID, ?) = ? GROUP BY ENROLMENT_ID";
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
-                stmt.setLong(1, timeStamp);
-                stmt.setInt(2, deviceTypeId);
-                stmt.setInt(3, activeServerCount);
-                stmt.setInt(4, serverHashIndex);
-                try (ResultSet rs = stmt.executeQuery()) {
-                    lastConnectedTimeMap = new HashMap<>();
-                    while (rs.next()) {
-                        lastConnectedTimeMap.put(rs.getInt("EID"), rs.getLong("LAST_CONNECTED_TIME"));
-                    }
-                }
-            }
-        } catch (SQLException e) {
-            String msg = "Error occurred while fetching last connected time for " +
-                         "active devices of type '" + deviceTypeId + "'";
-            log.error(msg, e);
-            throw new OperationManagementDAOException(msg, e);
-        }
-        return lastConnectedTimeMap;
-    }
-
     private OperationEnrolmentMapping getEnrolmentOpMapping(ResultSet rs) throws SQLException {
         OperationEnrolmentMapping enrolmentOperationMapping = new OperationEnrolmentMapping();
         enrolmentOperationMapping.setEnrolmentId(rs.getInt("ENROLMENT_ID"));

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -1405,6 +1405,12 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                     log.debug(msg);
                 }
                 return null;
+            } else {
+                Device deviceFromCache = getDeviceFromCache(deviceData.getDeviceIdentifier());
+                if (deviceFromCache != null && device.getEnrolmentInfo() != null &&
+                        deviceFromCache.getEnrolmentInfo().getStatus() != device.getEnrolmentInfo().getStatus()) {
+                    this.addDeviceToCache(deviceData.getDeviceIdentifier(), device);
+                }
             }
         } catch (DeviceManagementDAOException e) {
             String msg =

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/status/task/impl/DeviceStatusMonitoringTask.java

@@ -21,24 +21,18 @@ package org.wso2.carbon.device.mgt.core.status.task.impl;
 import com.google.gson.Gson;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.wso2.carbon.device.mgt.common.Device;
 import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.DeviceStatusTaskPluginConfig;
 import org.wso2.carbon.device.mgt.common.DynamicTaskContext;
 import org.wso2.carbon.device.mgt.common.EnrolmentInfo;
+import org.wso2.carbon.device.mgt.common.device.details.DeviceMonitoringData;
 import org.wso2.carbon.device.mgt.common.exceptions.DeviceManagementException;
 import org.wso2.carbon.device.mgt.common.exceptions.TransactionManagementException;
 import org.wso2.carbon.device.mgt.core.cache.impl.DeviceCacheManagerImpl;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOException;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOFactory;
-import org.wso2.carbon.device.mgt.core.internal.DeviceManagementDataHolder;
-import org.wso2.carbon.device.mgt.core.operation.mgt.OperationEnrolmentMapping;
-import org.wso2.carbon.device.mgt.core.operation.mgt.dao.OperationManagementDAOException;
-import org.wso2.carbon.device.mgt.core.operation.mgt.dao.OperationManagementDAOFactory;
-import org.wso2.carbon.device.mgt.core.service.DeviceManagementProviderService;
 import org.wso2.carbon.device.mgt.core.status.task.DeviceStatusTaskException;
 import org.wso2.carbon.device.mgt.core.task.impl.DynamicPartitionedScheduleTask;
-import org.wso2.carbon.ntask.core.Task;
 
 import java.sql.SQLException;
 import java.util.ArrayList;
@@ -67,64 +61,65 @@ public class DeviceStatusMonitoringTask extends DynamicPartitionedScheduleTask {
 
     @Override
     protected void setup() {
+    }
 
+    public List<DeviceMonitoringData> getAllDevicesForMonitoring() throws DeviceManagementException {
+
+        try {
+            DeviceManagementDAOFactory.openConnection();
+            DynamicTaskContext ctx = getTaskContext();
+            if (ctx != null && ctx.isPartitioningEnabled()) {
+                return DeviceManagementDAOFactory.getDeviceDAO()
+                        .getAllDevicesForMonitoring(this.deviceTypeId, this.deviceType,
+                                ctx.getActiveServerCount(), ctx.getServerHashIndex());
+            } else {
+                return DeviceManagementDAOFactory.getDeviceDAO()
+                        .getAllDevicesForMonitoring(this.deviceTypeId, this.deviceType, -1, -1);
+            }
+        } catch (DeviceManagementDAOException e) {
+            String msg = "Error occurred while retrieving devices list for monitoring.";
+            log.error(msg, e);
+            throw new DeviceManagementException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred while opening a connection to the data source";
+            log.error(msg, e);
+            throw new DeviceManagementException(msg, e);
+        } finally {
+            DeviceManagementDAOFactory.closeConnection();
+        }
     }
 
     @Override
     public void executeDynamicTask() {
-        List<OperationEnrolmentMapping> operationEnrolmentMappings;
+        try {
             List<EnrolmentInfo> enrolmentInfoTobeUpdated = new ArrayList<>();
-        Map<Integer, Long> lastActivities = null;
+            List<DeviceMonitoringData> allDevicesForMonitoring = getAllDevicesForMonitoring();
-        EnrolmentInfo enrolmentInfo;
+            long timeMillis = System.currentTimeMillis();
-        DeviceIdentifier deviceIdentifier;
+            for (DeviceMonitoringData monitoringData : allDevicesForMonitoring) {
-        Device device;
+                long lastUpdatedTime = (timeMillis - monitoringData
-        try {
+                        .getLastUpdatedTime()) / 1000;
-            operationEnrolmentMappings = this.getOperationEnrolmentMappings(super.getTaskContext());
+
-            if (!operationEnrolmentMappings.isEmpty()) {
+                EnrolmentInfo enrolmentInfo = new EnrolmentInfo();
-                lastActivities = this.getLastDeviceActivities(super.getTaskContext());
+                enrolmentInfo.setId(monitoringData.getDevice().getEnrolmentInfo().getId());
-            }
+                EnrolmentInfo.Status status = null;
-        } catch (DeviceStatusTaskException e) {
+                if (lastUpdatedTime >= this.deviceStatusTaskPluginConfig
-            log.error("Error occurred while fetching OperationEnrolment mappings of deviceType '" + deviceType + "'", e);
+                        .getIdleTimeToMarkInactive()) {
-            return;
+                    status = EnrolmentInfo.Status.INACTIVE;
-        }
+                } else if (lastUpdatedTime >= this.deviceStatusTaskPluginConfig
-        for (OperationEnrolmentMapping mapping : operationEnrolmentMappings) {
+                        .getIdleTimeToMarkUnreachable()) {
-            long lastActivity = -1;
+                    status = EnrolmentInfo.Status.UNREACHABLE;
-            if (lastActivities != null && lastActivities.containsKey(mapping.getEnrolmentId())) {
-                lastActivity = lastActivities.get(mapping.getEnrolmentId());
-            }
-            EnrolmentInfo.Status newStatus = this.determineDeviceStatus(mapping, lastActivity);
-            if (newStatus != mapping.getDeviceStatus()) {
-                deviceIdentifier = new DeviceIdentifier();
-                deviceIdentifier.setId(mapping.getDeviceId());
-                deviceIdentifier.setId(mapping.getDeviceType());
-                device = DeviceCacheManagerImpl.getInstance().getDeviceFromCache(deviceIdentifier, mapping.getTenantId());
-                if (device == null) {
-                    enrolmentInfo = new EnrolmentInfo();
-                    enrolmentInfo.setId(mapping.getEnrolmentId());
-                    enrolmentInfo.setStatus(newStatus);
-                } else {
-                    DeviceManagementProviderService dmps = DeviceManagementDataHolder.getInstance()
-                            .getDeviceManagementProvider();
-                    try {
-                        Device updatedDevice = dmps
-                                .getDevice(device.getDeviceIdentifier(), device.getDeviceInfo().getUpdatedTime(), true);
-                        if (updatedDevice != null) {
-                            device = updatedDevice;
-                        }
-                    } catch (DeviceManagementException e) {
-                        log.error(
-                                "Error occurred while getting the updated device information which has device identifier: "
-                                        + device.getDeviceIdentifier());
-                    }
-                    enrolmentInfo = device.getEnrolmentInfo();
-                    enrolmentInfo.setStatus(newStatus);
-                    device.setEnrolmentInfo(enrolmentInfo);
-                    DeviceCacheManagerImpl.getInstance().addDeviceToCache(deviceIdentifier, device, mapping.getTenantId());
                 }
+
+                if (status != null) {
+                    enrolmentInfo.setStatus(status);
                     enrolmentInfoTobeUpdated.add(enrolmentInfo);
-                if(log.isDebugEnabled()){
+                    DeviceIdentifier deviceIdentifier =
-                    log.debug("Enrollment Information updated for device ID : " +  device.getDeviceIdentifier());
+                            new DeviceIdentifier(monitoringData.getDevice()
-                }
+                                    .getDeviceIdentifier(), deviceType);
+                    DeviceCacheManagerImpl.getInstance().removeDeviceFromCache(deviceIdentifier,
+                            monitoringData.getTenantId());
+                    DeviceCacheManagerImpl.getInstance().addDeviceToCache(deviceIdentifier,
+                            monitoringData.getDevice(), monitoringData.getTenantId());
                 }
             }
 
@@ -132,37 +127,18 @@ public class DeviceStatusMonitoringTask extends DynamicPartitionedScheduleTask {
                 try {
                     this.updateDeviceStatus(enrolmentInfoTobeUpdated);
                 } catch (DeviceStatusTaskException e) {
-                log.error("Error occurred while updating non-responsive device-status of devices of type '" + deviceType + "'", e);
+                    log.error("Error occurred while updating non-responsive " +
-            }
+                            "device-status of devices of type '" + deviceType + "'", e);
                 }
             }
 
-    private EnrolmentInfo.Status determineDeviceStatus(OperationEnrolmentMapping opMapping, long lastActivityTime) {
+
-        long lastPendingOpBefore = (System.currentTimeMillis() / 1000) - opMapping.getCreatedTime();
+        } catch (DeviceManagementException e) {
-        EnrolmentInfo.Status newStatus = null;
+            String msg = "Error occurred while retrieving devices list for monitoring.";
-        if (lastPendingOpBefore >= this.deviceStatusTaskPluginConfig.getIdleTimeToMarkInactive()) {
+            log.error(msg, e);
-            newStatus = EnrolmentInfo.Status.INACTIVE;
-        } else if (lastPendingOpBefore >= this.deviceStatusTaskPluginConfig.getIdleTimeToMarkUnreachable()) {
-            newStatus = EnrolmentInfo.Status.UNREACHABLE;
         }
-        if (lastActivityTime != -1) {
-            long lastActivityBefore = (System.currentTimeMillis() / 1000) - lastActivityTime;
-            if (lastActivityBefore < lastPendingOpBefore) {
-                return opMapping.getDeviceStatus();
-            }
-        }
-        return newStatus;
     }
 
-    private long getMinTimeWindow() {
-        return (System.currentTimeMillis() / 1000) - this.deviceStatusTaskPluginConfig.getIdleTimeToMarkUnreachable();
-    }
-
-    private long getMaxTimeWindow() {
-        //Need to consider the frequency of the task as well
-        return (System.currentTimeMillis() / 1000) - this.deviceStatusTaskPluginConfig.getIdleTimeToMarkInactive() -
-                this.deviceStatusTaskPluginConfig.getFrequency();
-    }
 
     private boolean updateDeviceStatus(List<EnrolmentInfo> enrolmentInfos) throws
             DeviceStatusTaskException {
@@ -184,56 +160,4 @@ public class DeviceStatusMonitoringTask extends DynamicPartitionedScheduleTask {
         return updateStatus;
     }
 
-    private List<OperationEnrolmentMapping> getOperationEnrolmentMappings(DynamicTaskContext ctx) throws DeviceStatusTaskException {
-        List<OperationEnrolmentMapping> operationEnrolmentMappings;
-        try {
-            OperationManagementDAOFactory.openConnection();
-            if(ctx != null && ctx.isPartitioningEnabled()){
-                operationEnrolmentMappings = OperationManagementDAOFactory.
-                        getOperationMappingDAO().getFirstPendingOperationMappingsForActiveEnrolments(this.getMinTimeWindow(),
-                                                                                                     this.getMaxTimeWindow(), this.deviceTypeId,
-                                                                                                     ctx.getActiveServerCount(), ctx.getServerHashIndex());
-            } else {
-                operationEnrolmentMappings = OperationManagementDAOFactory.
-                        getOperationMappingDAO().getFirstPendingOperationMappingsForActiveEnrolments(this.getMinTimeWindow(),
-                                                                                                     this.getMaxTimeWindow(), this.deviceTypeId);
-            }
-
-        } catch (SQLException e) {
-            throw new DeviceStatusTaskException("Error occurred while getting Enrolment operation mappings for " +
-                    "determining device status of deviceType '" + deviceType + "'", e);
-        } catch (OperationManagementDAOException e) {
-            throw new DeviceStatusTaskException("Error occurred obtaining a DB connection for fetching " +
-                    "operation-enrolment mappings for status monitoring of deviceType '" + deviceType + "'", e);
-        } finally {
-            OperationManagementDAOFactory.closeConnection();
-        }
-        return operationEnrolmentMappings;
-    }
-
-    private Map<Integer, Long> getLastDeviceActivities(DynamicTaskContext ctx) throws DeviceStatusTaskException {
-        Map<Integer, Long> lastActivities;
-        try {
-            OperationManagementDAOFactory.openConnection();
-            if(ctx != null && ctx.isPartitioningEnabled()) {
-                lastActivities = OperationManagementDAOFactory.
-                        getOperationMappingDAO().getLastConnectedTimeForActiveEnrolments(this.getMaxTimeWindow(),
-                                                                                         this.deviceTypeId,
-                                                                                         ctx.getActiveServerCount(), ctx.getServerHashIndex());
-            } else {
-                lastActivities = OperationManagementDAOFactory.
-                        getOperationMappingDAO().getLastConnectedTimeForActiveEnrolments(this.getMaxTimeWindow(),
-                                                                                         this.deviceTypeId);
-            }
-        } catch (SQLException e) {
-            throw new DeviceStatusTaskException("Error occurred while getting last activities for " +
-                    "determining device status of deviceType '" + deviceType + "'", e);
-        } catch (OperationManagementDAOException e) {
-            throw new DeviceStatusTaskException("Error occurred obtaining a DB connection for fetching " +
-                    "last activities for status monitoring of deviceType '" + deviceType + "'", e);
-        } finally {
-            OperationManagementDAOFactory.closeConnection();
-        }
-        return lastActivities;
-    }
 }