Fixing https://github.com/wso2/carbon-device-mgt-plugins/issues/613

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/enforcement/DelegationTask.java

@@ -29,6 +29,7 @@ import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
 import org.wso2.carbon.policy.mgt.core.cache.impl.PolicyCacheManagerImpl;
 import org.wso2.carbon.policy.mgt.core.internal.PolicyManagementDataHolder;
 import org.wso2.carbon.policy.mgt.core.mgt.PolicyManager;
+import org.wso2.carbon.policy.mgt.core.mgt.bean.UpdatedPolicyDeviceListBean;
 import org.wso2.carbon.policy.mgt.core.mgt.impl.PolicyManagerImpl;
 
 import java.util.ArrayList;
@@ -54,7 +55,8 @@ public class DelegationTask implements Task {
 
         try {
             PolicyManager policyManager = new PolicyManagerImpl();
-            List<String> deviceTypes = policyManager.applyChangesMadeToPolicies();
+            UpdatedPolicyDeviceListBean updatedPolicyDeviceList = policyManager.applyChangesMadeToPolicies();
+            List<String> deviceTypes = updatedPolicyDeviceList.getChangedDeviceTypes();
 
             PolicyCacheManagerImpl.getInstance().rePopulateCache();
 
@@ -78,7 +80,8 @@ public class DelegationTask implements Task {
                             // }
                         }
                         if (!toBeNotified.isEmpty()) {
-                            PolicyEnforcementDelegator enforcementDelegator = new PolicyEnforcementDelegatorImpl(toBeNotified);
+                            PolicyEnforcementDelegator enforcementDelegator = new PolicyEnforcementDelegatorImpl
+                                    (toBeNotified, updatedPolicyDeviceList.getUpdatedPolicyIds());
                             enforcementDelegator.delegate();
                         }
                     } catch (DeviceManagementException e) {

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/enforcement/PolicyEnforcementDelegatorImpl.java

@@ -44,8 +44,9 @@ public class PolicyEnforcementDelegatorImpl implements PolicyEnforcementDelegato
     private static final Log log = LogFactory.getLog(PolicyEnforcementDelegatorImpl.class);
 
     private List<Device> devices;
+    private List<Integer> updatedPolicyIds;
 
-    public PolicyEnforcementDelegatorImpl(List<Device> devices) {
+    public PolicyEnforcementDelegatorImpl(List<Device> devices, List<Integer> updatedPolicyIds) {
 
         log.info("Policy re-enforcing stared due to change of the policies.");
 
@@ -56,6 +57,7 @@ public class PolicyEnforcementDelegatorImpl implements PolicyEnforcementDelegato
             }
         }
         this.devices = devices;
+        this.updatedPolicyIds = updatedPolicyIds;
 
     }
 
@@ -66,12 +68,22 @@ public class PolicyEnforcementDelegatorImpl implements PolicyEnforcementDelegato
             identifier.setId(device.getDeviceIdentifier());
             identifier.setType(device.getType());
 
+            Policy devicePolicy = this.getAppliedPolicyToDevice(identifier);
             Policy policy = this.getEffectivePolicy(identifier);
             List<DeviceIdentifier> deviceIdentifiers = new ArrayList<>();
             deviceIdentifiers.add(identifier);
             if (policy != null) {
-                this.addPolicyRevokeOperation(deviceIdentifiers);
+                 /*
-                this.addPolicyOperation(deviceIdentifiers, policy);
+                We add policy operation for the device if,
+                    1) Device does not have any policy or
+                    2) New Policy or
+                    3) Device existing policy has changed
+                 */
+                if (devicePolicy == null || devicePolicy.getId() != policy.getId() || updatedPolicyIds.contains
+                        (policy.getId())) {
+                    this.addPolicyRevokeOperation(deviceIdentifiers);
+                    this.addPolicyOperation(deviceIdentifiers, policy);
+                }
             } else {
                 //This means all the applicable policies have been removed from device. Hence calling a policy revoke.
                 this.addPolicyRevokeOperation(deviceIdentifiers);
@@ -154,4 +166,22 @@ public class PolicyEnforcementDelegatorImpl implements PolicyEnforcementDelegato
         policyRevokeOperation.setType(Operation.Type.COMMAND);
         return policyRevokeOperation;
     }
+
+    /**
+     * Provides the applied policy for give device
+     *
+     * @param identifier Device Identifier
+     * @return Applied Policy
+     * @throws PolicyDelegationException exception throws when retrieving applied policy for given device
+     */
+    public Policy getAppliedPolicyToDevice(DeviceIdentifier identifier) throws PolicyDelegationException {
+        try {
+            PolicyManagerService policyManagerService = new PolicyManagerServiceImpl();
+            return policyManagerService.getAppliedPolicyToDevice(identifier);
+        } catch (PolicyManagementException e) {
+            String msg = "Error occurred while retrieving the applied policy for devices.";
+            log.error(msg, e);
+            throw new PolicyDelegationException(msg, e);
+        }
+    }
 }

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/mgt/PolicyManager.java

@@ -21,6 +21,7 @@ import org.wso2.carbon.device.mgt.common.Device;
 import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.policy.mgt.Policy;
 import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
+import org.wso2.carbon.policy.mgt.core.mgt.bean.UpdatedPolicyDeviceListBean;
 
 import java.util.HashMap;
 import java.util.List;
@@ -67,7 +68,7 @@ public interface PolicyManager {
     void addAppliedPolicyFeaturesToDevice(DeviceIdentifier deviceIdentifier, Policy policy)
             throws PolicyManagementException;
 
-    List<String> applyChangesMadeToPolicies() throws PolicyManagementException;
+    UpdatedPolicyDeviceListBean applyChangesMadeToPolicies() throws PolicyManagementException;
 
     void addAppliedPolicyToDevice(DeviceIdentifier deviceIdentifier, Policy policy) throws PolicyManagementException;
 

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/mgt/bean/UpdatedPolicyDeviceListBean.java

@@ -0,0 +1,65 @@
+/*
+*  Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+*
+*  WSO2 Inc. 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.policy.mgt.core.mgt.bean;
+
+import org.wso2.carbon.device.mgt.common.policy.mgt.Policy;
+import org.wso2.carbon.device.mgt.core.dto.DeviceType;
+
+
+import java.util.List;
+
+/**
+ * This class stores list of updated policies and list of changed devices for Policy Manager
+ */
+public class UpdatedPolicyDeviceListBean {
+
+    private List<Policy> updatedPolicies;
+    private List<Integer> updatedPolicyIds;
+    private List<String> changedDeviceTypes;
+
+    public UpdatedPolicyDeviceListBean(List<Policy> updatedPolicies, List<Integer> updatedPolicyIds, List<String>
+            deviceTypes) {
+        this.updatedPolicies = updatedPolicies;
+        this.updatedPolicyIds = updatedPolicyIds;
+        this.changedDeviceTypes = deviceTypes;
+    }
+
+    public List<Policy> getUpdatedPolicies() {
+        return updatedPolicies;
+    }
+
+    public void setUpdatedPolicies(List<Policy> updatedPolicies) {
+        this.updatedPolicies = updatedPolicies;
+    }
+
+    public List<Integer> getUpdatedPolicyIds() {
+        return updatedPolicyIds;
+    }
+
+    public void setUpdatedPolicyIds(List<Integer> updatedPolicyIds) {
+        this.updatedPolicyIds = updatedPolicyIds;
+    }
+
+    public List<String> getChangedDeviceTypes() {
+        return changedDeviceTypes;
+    }
+
+    public void setChangedDeviceTypes(List<String> changedDeviceTypes) {
+        this.changedDeviceTypes = changedDeviceTypes;
+    }
+}

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/mgt/impl/PolicyManagerImpl.java

@@ -39,6 +39,7 @@ import org.wso2.carbon.policy.mgt.core.cache.impl.PolicyCacheManagerImpl;
 import org.wso2.carbon.policy.mgt.core.dao.*;
 import org.wso2.carbon.policy.mgt.core.mgt.PolicyManager;
 import org.wso2.carbon.policy.mgt.core.mgt.ProfileManager;
+import org.wso2.carbon.policy.mgt.core.mgt.bean.UpdatedPolicyDeviceListBean;
 import org.wso2.carbon.policy.mgt.core.util.PolicyManagerUtil;
 
 import java.sql.SQLException;
@@ -830,15 +831,15 @@ public class PolicyManagerImpl implements PolicyManager {
     }
 
     @Override
-    public List<String> applyChangesMadeToPolicies() throws PolicyManagementException {
+    public UpdatedPolicyDeviceListBean applyChangesMadeToPolicies() throws PolicyManagementException {
 
         List<String> changedDeviceTypes = new ArrayList<>();
+        List<Policy> updatedPolicies = new ArrayList<>();
+        List<Integer> updatedPolicyIds = new ArrayList<>();
         try {
             //HashMap<Integer, Integer> map = policyDAO.getUpdatedPolicyIdandDeviceTypeId();
-            List<Policy> updatedPolicies = new ArrayList<>();
 //            List<Policy> activePolicies = new ArrayList<>();
 //            List<Policy> inactivePolicies = new ArrayList<>();
-            List<Integer> updatedPolicyIds = new ArrayList<>();
 
 //            List<Policy> allPolicies = this.getPolicies();
             List<Policy> allPolicies = PolicyCacheManagerImpl.getInstance().getAllPolicies();
@@ -867,7 +868,7 @@ public class PolicyManagerImpl implements PolicyManager {
         } finally {
             PolicyManagementDAOFactory.closeConnection();
         }
-        return changedDeviceTypes;
+        return new UpdatedPolicyDeviceListBean(updatedPolicies, updatedPolicyIds, changedDeviceTypes);
     }