Modify operation template

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/cache/OperationTemplateCacheLoader.java

@@ -65,7 +65,7 @@ public class OperationTemplateCacheLoader extends CacheLoader<String, OperationT
         }
         try {
             ConnectionManagerUtils.openDBConnection();
-            return operationTemplateDAO.getOperationTemplate(subTypeId, deviceType, operationCode);
+            return operationTemplateDAO.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(deviceType, subTypeId, operationCode);
         } catch (DBConnectionException e) {
             String msg =
                     "Error occurred while obtaining the database connection to retrieve operation template for "

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/cache/OperationTemplateCodesCacheLoader.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018 - 2024, 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 io.entgra.device.mgt.core.operation.template.cache;
+
+import com.google.common.cache.CacheLoader;
+import io.entgra.device.mgt.core.operation.template.dao.OperationTemplateDAO;
+import io.entgra.device.mgt.core.operation.template.dao.OperationTemplateDAOFactory;
+import io.entgra.device.mgt.core.operation.template.dao.impl.util.OperationTemplateManagementUtil;
+import io.entgra.device.mgt.core.operation.template.dto.OperationTemplateCacheKey;
+import io.entgra.device.mgt.core.operation.template.exception.DBConnectionException;
+import io.entgra.device.mgt.core.operation.template.exception.OperationTemplateManagementDAOException;
+import io.entgra.device.mgt.core.operation.template.exception.OperationTemplateMgtPluginException;
+import io.entgra.device.mgt.core.operation.template.util.ConnectionManagerUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Class for the Operation Template cache.
+ */
+public class OperationTemplateCodesCacheLoader extends CacheLoader<String, Set<String>> {
+
+    private static final Log log = LogFactory.getLog(OperationTemplateCodesCacheLoader.class);
+
+    private final OperationTemplateDAO operationTemplateDAO;
+
+    public OperationTemplateCodesCacheLoader() {
+        this.operationTemplateDAO = OperationTemplateDAOFactory.getOperationTemplateDAO();
+    }
+
+    /**
+     *
+     * @param key the non-null key whose value should be loaded
+     * @return
+     * @throws OperationTemplateMgtPluginException
+     */
+    @Override
+    public Set<String> load(String key) throws OperationTemplateMgtPluginException {
+        OperationTemplateCacheKey operationTemplateCacheKey = OperationTemplateManagementUtil.getOperationTemplateCodeCacheKey(
+                key);
+        String subTypeId = operationTemplateCacheKey.getSubTypeId();
+        String deviceType = operationTemplateCacheKey.getDeviceType();
+
+        if (log.isTraceEnabled()) {
+            log.trace(
+                    "Loading operation template for subtype Id : " + subTypeId + " & deviceType : " + deviceType);
+        }
+        try {
+            ConnectionManagerUtils.openDBConnection();
+            return operationTemplateDAO.getOperationTemplateCodesByDeviceTypeAndSubTypeId(deviceType, subTypeId);
+        } catch (DBConnectionException e) {
+            String msg =
+                    "Error occurred while obtaining the database connection to retrieve operation template codes for "
+                            +
+                            "subtype Id : " + subTypeId + " & device type : " + deviceType;
+            log.error(msg);
+            throw new OperationTemplateMgtPluginException(msg, e);
+        } catch (InvalidCacheLoadException e) {
+            String msg =
+                    "CacheLoader returned null for operation template codes for subtype Id : " + subTypeId
+                            + " & device type : " + deviceType;
+            log.error(msg, e);
+            return null;
+        } catch (OperationTemplateManagementDAOException e) {
+            String msg =
+                    "Error occurred in the database level while retrieving operation template codes for subtype Id : "
+                            + subTypeId + " & device type : " + deviceType;
+            log.error(msg);
+            throw new OperationTemplateMgtPluginException(msg, e);
+        } finally {
+            ConnectionManagerUtils.closeDBConnection();
+        }
+    }
+
+}

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/dao/OperationTemplateDAO.java

@@ -21,6 +21,9 @@ package io.entgra.device.mgt.core.operation.template.dao;
 import io.entgra.device.mgt.core.operation.template.dto.OperationTemplate;
 import io.entgra.device.mgt.core.operation.template.exception.OperationTemplateManagementDAOException;
 
+import java.util.List;
+import java.util.Set;
+
 /**
  * This class represents the key operations associated with persisting mobile-device related
  * information.
@@ -31,8 +34,11 @@ public interface OperationTemplateDAO {
     OperationTemplate updateOperationTemplate(OperationTemplate operationTemplate)
             throws OperationTemplateManagementDAOException;
 
-    OperationTemplate getOperationTemplate(String subTypeId, String deviceType, String operationCode) throws OperationTemplateManagementDAOException;
+    OperationTemplate getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode) throws OperationTemplateManagementDAOException;
+
+    List<OperationTemplate> getAllOperationTemplatesByDeviceType(String deviceType) throws OperationTemplateManagementDAOException;
 
-    void deleteOperationTemplate(String subTypeId, String deviceCode, String operationCode) throws OperationTemplateManagementDAOException;
+    int deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode) throws OperationTemplateManagementDAOException;
 
+     Set<String> getOperationTemplateCodesByDeviceTypeAndSubTypeId(String deviceType, String subTypeId) throws OperationTemplateManagementDAOException;
 }

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/dao/impl/OperationTemplateDAOImpl.java

@@ -31,6 +31,10 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -102,7 +106,7 @@ public class OperationTemplateDAOImpl implements OperationTemplateDAO {
                 stmt.setString(5, operationTemplate.getCode());
                 stmt.executeUpdate();
 
-                return getOperationTemplate(operationTemplate.getSubTypeId(), operationTemplate.getDeviceType(), operationTemplate.getCode());
+                return getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(operationTemplate.getDeviceType(), operationTemplate.getSubTypeId(), operationTemplate.getCode());
             } catch (SQLException e) {
                 String msg = "Error occurred while processing update operation template.";
                 log.error(msg);
@@ -122,14 +126,14 @@ public class OperationTemplateDAOImpl implements OperationTemplateDAO {
      * @throws OperationTemplateManagementDAOException
      */
     @Override
-    public OperationTemplate getOperationTemplate(String subTypeId, String deviceType, String operationCode)
+    public OperationTemplate getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode)
             throws OperationTemplateManagementDAOException {
         try {
-            String sql = "SELECT * FROM SUB_OPERATION_TEMPLATE WHERE SUB_TYPE_ID = ? AND DEVICE_TYPE = ? AND OPERATION_CODE = ?";
+            String sql = "SELECT * FROM SUB_OPERATION_TEMPLATE WHERE DEVICE_TYPE = ? AND SUB_TYPE_ID = ? AND OPERATION_CODE = ?";
             Connection conn = ConnectionManagerUtils.getDBConnection();
             try (PreparedStatement stmt = conn.prepareStatement(sql)) {
-                stmt.setString(1, subTypeId);
+                stmt.setString(1, deviceType);
-                stmt.setString(2, deviceType);
+                stmt.setString(2, subTypeId);
                 stmt.setString(3, operationCode);
 
                 try (ResultSet rs = stmt.executeQuery()) {
@@ -151,22 +155,94 @@ public class OperationTemplateDAOImpl implements OperationTemplateDAO {
     }
 
     /**
-     * @param subTypeId
      * @param deviceType
-     * @param operationCode
+     * @param subTypeId
+     * @return
      * @throws OperationTemplateManagementDAOException
      */
     @Override
-    public void deleteOperationTemplate(String subTypeId, String deviceType, String operationCode)
+    public Set<String> getOperationTemplateCodesByDeviceTypeAndSubTypeId(String deviceType, String subTypeId)
             throws OperationTemplateManagementDAOException {
-        String sql = "DELETE FROM SUB_OPERATION_TEMPLATE WHERE SUB_TYPE_ID = ? AND DEVICE_TYPE = ? AND OPERATION_CODE = ?";
+
         try {
+            String sql = "SELECT OPERATION_CODE FROM SUB_OPERATION_TEMPLATE WHERE SUB_TYPE_ID = ? AND DEVICE_TYPE = ?";
             Connection conn = ConnectionManagerUtils.getDBConnection();
             try (PreparedStatement stmt = conn.prepareStatement(sql)) {
                 stmt.setString(1, subTypeId);
                 stmt.setString(2, deviceType);
+
+                Set<String> deviceTypes = new HashSet<>();
+                try (ResultSet rs = stmt.executeQuery()) {
+                    while (rs.next()) {
+                        deviceTypes.add(rs.getString("OPERATION_CODE"));
+                    }
+                    return deviceTypes;
+                }
+            } catch (SQLException e) {
+                String msg = "Error occurred while getting operation template codes for sub type id : " + subTypeId
+                        + " and device type : " + deviceType;
+                log.error(msg, e);
+                throw new OperationTemplateManagementDAOException(msg, e);
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining DB connection to getting operation template codes.";
+            log.error(msg);
+            throw new OperationTemplateManagementDAOException(msg, e);
+        }
+    }
+
+
+    /**
+     * @param deviceType
+     * @return
+     * @throws OperationTemplateManagementDAOException
+     */
+    @Override
+    public List<OperationTemplate> getAllOperationTemplatesByDeviceType(String deviceType)
+            throws OperationTemplateManagementDAOException {
+
+        try {
+            String sql = "SELECT * FROM SUB_OPERATION_TEMPLATE WHERE DEVICE_TYPE = ?";
+            List<OperationTemplate> operationTemplates = new ArrayList<>();
+
+            Connection conn = ConnectionManagerUtils.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, deviceType);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    while (rs.next()) {
+                        operationTemplates.add(DAOUtil.loadOperationTemplate(rs));
+                    }
+                    return operationTemplates;
+                }
+            } catch (SQLException e) {
+                String msg = "Error occurred while loading operation template list.";
+                log.error(e.getMessage());
+                throw new OperationTemplateManagementDAOException(msg, e);
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining DB connection to loading operation template list.";
+            log.error(msg);
+            throw new OperationTemplateManagementDAOException(msg, e);
+        }
+    }
+
+    /**
+     * @param subTypeId
+     * @param deviceType
+     * @param operationCode
+     * @throws OperationTemplateManagementDAOException
+     */
+    @Override
+    public int deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode)
+            throws OperationTemplateManagementDAOException {
+        String sql = "DELETE FROM SUB_OPERATION_TEMPLATE WHERE DEVICE_TYPE = ? AND SUB_TYPE_ID = ? AND OPERATION_CODE = ?";
+        try {
+            Connection conn = ConnectionManagerUtils.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, deviceType);
+                stmt.setString(2, subTypeId);
                 stmt.setString(3, operationCode);
-                stmt.executeUpdate();
+                return stmt.executeUpdate();
             } catch (SQLException e) {
                 String msg = "Error occurred while deleting operation template for sub type id : " + subTypeId
                         + " and operation code : " + operationCode;

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/dao/impl/util/OperationTemplateManagementUtil.java

@@ -59,8 +59,18 @@ public class OperationTemplateManagementUtil {
      * @param operationCode
      * @return
      */
-    public static String setOperationTemplateCacheKey(String subTypeId, String deviceType, String operationCode) {
+    public static String setOperationTemplateCacheKey(String deviceType, String subTypeId, String operationCode) {
-        return subTypeId + "|" + deviceType + "|" + operationCode;
+        return deviceType + "|" + subTypeId + "|" + operationCode;
+    }
+
+    /**
+     *
+     * @param subTypeId
+     * @param deviceType
+     * @return
+     */
+    public static String setOperationTemplateCacheKey(String deviceType, String subTypeId) {
+        return deviceType + "|" + subTypeId;
     }
 
     /**
@@ -70,8 +80,8 @@ public class OperationTemplateManagementUtil {
      */
     public static OperationTemplateCacheKey getOperationTemplateCacheKey(String key) {
         String[] keys = key.split("\\|");
-        String subTypeId = keys[0];;
+        String deviceType = keys[0];;
-        String deviceType = keys[1];
+        String subTypeId = keys[1];
         String operationCode = keys[2];
 
         OperationTemplateCacheKey operationTemplateCacheKey = new OperationTemplateCacheKey();
@@ -82,4 +92,22 @@ public class OperationTemplateManagementUtil {
         return operationTemplateCacheKey;
     }
 
+    /**
+     *
+     * @param key
+     * @return
+     */
+    public static OperationTemplateCacheKey getOperationTemplateCodeCacheKey(String key) {
+
+        String[] keys = key.split("\\|");
+        String deviceType = keys[0];;
+        String subTypeId = keys[1];
+
+        OperationTemplateCacheKey operationTemplateCacheKey = new OperationTemplateCacheKey();
+        operationTemplateCacheKey.setSubTypeId(subTypeId);
+        operationTemplateCacheKey.setDeviceType(deviceType);
+
+        return operationTemplateCacheKey;
+    }
+
 }

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/impl/OperationTemplateServiceImpl.java

@@ -22,6 +22,7 @@ import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
 import io.entgra.device.mgt.core.operation.template.cache.OperationTemplateCacheLoader;
+import io.entgra.device.mgt.core.operation.template.cache.OperationTemplateCodesCacheLoader;
 import io.entgra.device.mgt.core.operation.template.dao.OperationTemplateDAO;
 import io.entgra.device.mgt.core.operation.template.dao.OperationTemplateDAOFactory;
 import io.entgra.device.mgt.core.operation.template.dao.impl.util.OperationTemplateManagementUtil;
@@ -35,6 +36,10 @@ import io.entgra.device.mgt.core.operation.template.util.AssertUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 
@@ -46,6 +51,9 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
     private static final Log log = LogFactory.getLog(OperationTemplateServiceImpl.class);
     private static final LoadingCache<String, OperationTemplate> operationTemplateCache = CacheBuilder.newBuilder()
             .expireAfterWrite(15, TimeUnit.MINUTES).build(new OperationTemplateCacheLoader());
+
+    private static final LoadingCache<String, Set<String>> operationTemplateCodeCache = CacheBuilder.newBuilder()
+            .expireAfterWrite(15, TimeUnit.MINUTES).build(new OperationTemplateCodesCacheLoader());
     private final OperationTemplateDAO operationTemplateDAO;
 
     public OperationTemplateServiceImpl() {
@@ -67,10 +75,6 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
             operationTemplateDAO.addOperationTemplate(operationTemplate);
             ConnectionManagerUtils.commitDBTransaction();
 
-            String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
-                    operationTemplate.getSubTypeId(), operationTemplate.getDeviceType(), operationTemplate.getCode());
-            operationTemplateCache.put(key, operationTemplate);
-
             if (log.isDebugEnabled()) {
                 String msg = "Operation Template added successfully,for subtype id "
                         + operationTemplate.getSubTypeId() + " and operation code "
@@ -82,6 +86,61 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
             throw new OperationTemplateMgtPluginException(e.getMessage(), e);
         } finally {
             ConnectionManagerUtils.closeDBConnection();
+            addOperationTemplateDetailsForCacheLoader(operationTemplate);
+        }
+    }
+
+    public void addOperationTemplateDetailsForCacheLoader(OperationTemplate operationTemplate) {
+        try {
+            String operationTemplateKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
+                    operationTemplate.getDeviceType(), operationTemplate.getSubTypeId(), operationTemplate.getCode());
+            String operationTemplateCodeKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
+                    operationTemplate.getDeviceType(), operationTemplate.getSubTypeId());
+
+            operationTemplateCache.put(operationTemplateKey, operationTemplate);
+
+            Set<String> operationCodeList = operationTemplateCodeCache.get(operationTemplateCodeKey);
+            if (operationCodeList == null) {
+                operationCodeList = new HashSet<>();
+            }
+            operationCodeList.add(operationTemplate.getCode());
+            operationTemplateCodeCache.put(operationTemplateCodeKey, operationCodeList);
+        } catch (Exception e) {
+            log.error("Error occurred while adding operation template details for the cache loader", e);
+        }
+    }
+
+    public void deleteOperationTemplateDetailsForCacheLoader(String deviceType, String subTypeId, String code) {
+        try {
+            String operationTemplateKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
+                    deviceType, subTypeId, code);
+            String operationTemplateCodeKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
+                    deviceType, subTypeId);
+
+            operationTemplateCache.invalidate(operationTemplateKey);
+            operationTemplateCodeCache.invalidate(operationTemplateCodeKey);
+        } catch (Exception e) {
+            log.error("Error occurred removing operation template details for the cache loader", e);
+        }
+    }
+
+    public void refreshOperationTemplateDetailsForCacheLoader(OperationTemplate operationTemplate) {
+        try {
+            if (operationTemplate != null) {
+                String operationTemplateKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(operationTemplate.getDeviceType(),
+                        operationTemplate.getSubTypeId(), operationTemplate.getCode());
+                String operationTemplateCodeKey = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
+                        operationTemplate.getDeviceType(), operationTemplate.getSubTypeId());
+
+                operationTemplateCache.put(operationTemplateKey, operationTemplate);
+                Set<String> codeList = operationTemplateCodeCache.get(operationTemplateCodeKey);
+                codeList.remove(operationTemplate.getCode());
+                operationTemplateCodeCache.put(operationTemplateCodeKey, codeList);
+
+
+            }
+        } catch (ExecutionException e) {
+            log.error("Error occurred while updating operation template cache loader");
         }
     }
 
@@ -102,6 +161,7 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
             updatedOperationTemplate = operationTemplateDAO.updateOperationTemplate(
                     operationTemplate);
             ConnectionManagerUtils.commitDBTransaction();
+
             if (log.isDebugEnabled()) {
                 String msg = "Operation Template updated successfully,for subtype id "
                         + operationTemplate.getSubTypeId() + " and operation code " + operationTemplate.getCode()
@@ -114,12 +174,7 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
             throw new OperationTemplateMgtPluginException(e.getMessage(), e);
         } finally {
             ConnectionManagerUtils.closeDBConnection();
-
+            refreshOperationTemplateDetailsForCacheLoader(updatedOperationTemplate);
-            if (updatedOperationTemplate != null) {
-                String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
-                        operationTemplate.getSubTypeId(), operationTemplate.getDeviceType(), operationTemplate.getCode());
-                operationTemplateCache.refresh(key);
-            }
         }
     }
 
@@ -131,12 +186,12 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
      * @throws OperationTemplateMgtPluginException
      */
     @Override
-    public OperationTemplate getOperationTemplate(String subTypeId, String deviceType, String operationCode)
+    public OperationTemplate getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode)
             throws OperationTemplateMgtPluginException {
         try {
 
             validateGetOperationTemplate(subTypeId, deviceType, operationCode);
-            String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(subTypeId, deviceType,
+            String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(deviceType, subTypeId,
                     operationCode);
             return operationTemplateCache.get(key);
         } catch (ExecutionException e) {
@@ -150,6 +205,27 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
         }
     }
 
+    /**
+     * @param deviceType
+     * @return
+     * @throws OperationTemplateMgtPluginException
+     */
+    @Override
+    public List<OperationTemplate> getAllOperationTemplatesByDeviceType(String deviceType)
+            throws OperationTemplateMgtPluginException {
+        AssertUtils.hasText(deviceType, "Invalid device type.");
+        try {
+             ConnectionManagerUtils.openDBConnection();
+             return operationTemplateDAO.getAllOperationTemplatesByDeviceType(deviceType);
+        } catch (DBConnectionException | OperationTemplateManagementDAOException e) {
+            log.error(e.getMessage());
+            throw new OperationTemplateMgtPluginException(e.getMessage(), e);
+        } finally {
+            ConnectionManagerUtils.closeDBConnection();
+
+        }
+    }
+
     /**
      * @param subTypeId
      * @param deviceType
@@ -157,17 +233,18 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
      * @throws OperationTemplateMgtPluginException
      */
     @Override
-    public void deleteOperationTemplate(String subTypeId, String deviceType, String operationCode)
+    public void deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode)
             throws OperationTemplateMgtPluginException {
 
         String msg = "Operation Template does not exist for subtype id : " + subTypeId
                 + " and device type : " + deviceType + " and operation code : "
                 + operationCode;
-        AssertUtils.isNull(getOperationTemplate(subTypeId, deviceType, operationCode), msg);
+        AssertUtils.isNull(getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(deviceType, subTypeId, operationCode), msg);
 
+        int deleted = 0;
         try {
             ConnectionManagerUtils.beginDBTransaction();
-            operationTemplateDAO.deleteOperationTemplate(subTypeId, deviceType, operationCode);
+            deleted = operationTemplateDAO.deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(deviceType, subTypeId, operationCode);
             ConnectionManagerUtils.commitDBTransaction();
             if (log.isDebugEnabled()) {
                 String debugMsg = "Operation Template deleted successfully,for subtype id "
@@ -175,15 +252,43 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
                         + operationCode + "";
                 log.debug(debugMsg);
             }
-            String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(
-                    subTypeId, deviceType, operationCode);
-            operationTemplateCache.invalidate(key);
         } catch (DBConnectionException | OperationTemplateManagementDAOException e) {
             log.error(e.getMessage());
             throw new OperationTemplateMgtPluginException(e.getMessage(), e);
         } finally {
             ConnectionManagerUtils.closeDBConnection();
+            if (deleted == 1) {
+                deleteOperationTemplateDetailsForCacheLoader(deviceType, subTypeId, operationCode);
+            }
+
+        }
+    }
+
+    /**
+     * @param deviceType
+     * @param subTypeId
+     * @return
+     * @throws OperationTemplateMgtPluginException
+     */
+    @Override
+    public Set<String> getOperationTemplateCodesByDeviceTypeAndSubTypeId(String deviceType, String subTypeId)
+            throws OperationTemplateMgtPluginException  {
 
+        try {
+            AssertUtils.hasText(subTypeId, "Invalid meter device subtype id: " + subTypeId);
+            AssertUtils.isTrue(Integer.valueOf(subTypeId)>0, "Invalid meter device subtype id: " + subTypeId);
+            AssertUtils.hasText(deviceType, "Invalid device type.");
+
+            String key = OperationTemplateManagementUtil.setOperationTemplateCacheKey(deviceType, subTypeId);
+            return operationTemplateCodeCache.get(key);
+        } catch (ExecutionException e) {
+            log.error(e.getMessage());
+            throw new OperationTemplateMgtPluginException(e.getMessage(), e);
+        } catch (CacheLoader.InvalidCacheLoadException e) {
+            String msg = "Operation Template codes doesn't exist for subtype id : " + subTypeId + " and device type : "
+                    + deviceType;
+            log.error(msg, e);
+            return null;
         }
     }
 
@@ -216,7 +321,7 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
         String msg = "Operation Template already exist for subtype id : " + operationTemplate.getSubTypeId()
                 + " and device type : " + operationTemplate.getDeviceType() + " and operation code : "
                 + operationTemplate.getCode();
-        AssertUtils.notNull(getOperationTemplate(operationTemplate.getSubTypeId(), operationTemplate.getDeviceType(),
+        AssertUtils.notNull(getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(operationTemplate.getDeviceType(), operationTemplate.getSubTypeId(),
                 operationTemplate.getCode()), msg);
     }
 
@@ -232,7 +337,7 @@ public class OperationTemplateServiceImpl implements OperationTemplateService {
         String msg = "Operation Template does not exist for subtype id : " + operationTemplate.getSubTypeId()
                 + " and device type : " + operationTemplate.getDeviceType() + " and operation code : "
                 + operationTemplate.getCode();
-        AssertUtils.isNull(getOperationTemplate(operationTemplate.getSubTypeId(), operationTemplate.getDeviceType(),
+        AssertUtils.isNull(getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(operationTemplate.getDeviceType(), operationTemplate.getSubTypeId(),
                 operationTemplate.getCode()), msg);
     }
 

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/spi/OperationTemplateService.java

@@ -21,6 +21,9 @@ package io.entgra.device.mgt.core.operation.template.spi;
 import io.entgra.device.mgt.core.operation.template.dto.OperationTemplate;
 import io.entgra.device.mgt.core.operation.template.exception.OperationTemplateMgtPluginException;
 
+import java.util.List;
+import java.util.Set;
+
 /**
  * Operation Template service interface.
  */
@@ -30,8 +33,11 @@ public interface OperationTemplateService {
 
     OperationTemplate updateOperationTemplate(OperationTemplate operationTemplate) throws OperationTemplateMgtPluginException;
 
-    OperationTemplate getOperationTemplate(String subTypeId, String deviceType, String operationCode) throws OperationTemplateMgtPluginException;
+    OperationTemplate getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode) throws OperationTemplateMgtPluginException;
+
+    List<OperationTemplate> getAllOperationTemplatesByDeviceType(String deviceType) throws OperationTemplateMgtPluginException;
 
-    void deleteOperationTemplate(String subTypeId, String deviceType, String operationCode) throws OperationTemplateMgtPluginException;
+    void deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(String deviceType, String subTypeId, String operationCode) throws OperationTemplateMgtPluginException;
 
+    Set<String> getOperationTemplateCodesByDeviceTypeAndSubTypeId(String deviceType, String subTypeId) throws OperationTemplateMgtPluginException;
 }

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/main/java/io/entgra/device/mgt/core/operation/template/util/DAOUtil.java

@@ -44,7 +44,6 @@ public class DAOUtil {
     public static OperationTemplate loadOperationTemplate(ResultSet rs)
         throws SQLException, JsonSyntaxException {
         OperationTemplate operationTemplate = new OperationTemplate();
-        Gson g = new Gson();
         operationTemplate.setSubTypeId(rs.getString("SUB_TYPE_ID"));
         operationTemplate.setCode(rs.getString("OPERATION_CODE"));
         operationTemplate.setDeviceType(rs.getString("DEVICE_TYPE"));

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/test/java/io/entgra/device/mgt/core/operation/template/DAOTest.java

@@ -48,8 +48,8 @@ public class DAOTest extends BaseOperationTemplatePluginTest {
             throws DBConnectionException, OperationTemplateManagementDAOException {
 
         ConnectionManagerUtils.openDBConnection();
-        OperationTemplate operationTemplateActual = operationTemplateDAO.getOperationTemplate(
+        OperationTemplate operationTemplateActual = operationTemplateDAO.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(
-                "4", TestUtils.deviceType, TestUtils.operationCode);
+                 TestUtils.deviceType, "4", TestUtils.operationCode);
         ConnectionManagerUtils.closeDBConnection();
         Assert.assertNotNull(operationTemplateActual, "Cannot be null");
         Assert.assertEquals(operationTemplateActual.getSubTypeId(), "4");
@@ -72,8 +72,8 @@ public class DAOTest extends BaseOperationTemplatePluginTest {
         operationTemplateDAO.addOperationTemplate(operationTemplate);
         ConnectionManagerUtils.commitDBTransaction();
 
-        OperationTemplate operationTemplateActual = operationTemplateDAO.getOperationTemplate(
+        OperationTemplate operationTemplateActual = operationTemplateDAO.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(
-                "4", TestUtils.deviceType, TestUtils.operationCode);
+                TestUtils.deviceType, "4", TestUtils.operationCode);
         ConnectionManagerUtils.closeDBConnection();
         Assert.assertNotNull(operationTemplateActual, "Cannot be null");
         Assert.assertEquals(operationTemplateActual.getSubTypeId(), "4");
@@ -86,8 +86,8 @@ public class DAOTest extends BaseOperationTemplatePluginTest {
             throws DBConnectionException, OperationTemplateManagementDAOException {
 
         ConnectionManagerUtils.beginDBTransaction();
-        OperationTemplate operationTemplate = operationTemplateDAO.getOperationTemplate(
+        OperationTemplate operationTemplate = operationTemplateDAO.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(
-                "4", TestUtils.deviceType, TestUtils.operationCode);
+                TestUtils.deviceType, "4", TestUtils.operationCode);
         OperationTemplate operationTemplateActual = operationTemplateDAO.updateOperationTemplate(
                 operationTemplate);
         ConnectionManagerUtils.commitDBTransaction();

components/operation-template-mgt/io.entgra.device.mgt.core.operation.template/src/test/java/io/entgra/device/mgt/core/operation/template/ServiceTest.java

@@ -29,6 +29,9 @@ import org.testng.Assert;
 import org.testng.annotations.BeforeClass;
 import org.testng.annotations.Test;
 
+import java.util.List;
+import java.util.Set;
+
 public class ServiceTest extends BaseOperationTemplatePluginTest {
 
     private static final Log log = LogFactory.getLog(ServiceTest.class);
@@ -43,7 +46,8 @@ public class ServiceTest extends BaseOperationTemplatePluginTest {
     @Test(dependsOnMethods = "testAddOperationTemplate")
     public void testGetOperationTemplate() throws OperationTemplateMgtPluginException {
 
-        OperationTemplate operationTemplateActual = operationTemplateService.getOperationTemplate(TestUtils.subtypeId, TestUtils.deviceType, TestUtils.operationCode);
+        OperationTemplate operationTemplateActual = operationTemplateService.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(
+                TestUtils.deviceType, TestUtils.subtypeId, TestUtils.operationCode);
         Assert.assertEquals(operationTemplateActual.getSubTypeId(), operationTemplateActual.getSubTypeId());
         Assert.assertEquals(operationTemplateActual.getCode(), TestUtils.operationCode);
         Assert.assertEquals(operationTemplateActual.getDeviceType(), TestUtils.deviceType);
@@ -59,7 +63,7 @@ public class ServiceTest extends BaseOperationTemplatePluginTest {
         operationTemplate.setOperationDefinition(TestUtils.getOperationDefinition(TestUtils.subtypeId, TestUtils.operationCode));
         operationTemplateService.addOperationTemplate(operationTemplate);
 
-        OperationTemplate operationTemplateActual = operationTemplateService.getOperationTemplate(TestUtils.subtypeId, TestUtils.deviceType, TestUtils.operationCode);
+        OperationTemplate operationTemplateActual = operationTemplateService.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(TestUtils.deviceType, TestUtils.subtypeId, TestUtils.operationCode);
         Assert.assertNotNull(operationTemplateActual, "Cannot be null");
         Assert.assertEquals(operationTemplateActual.getOperationDefinition(), TestUtils.getOperationDefinition(TestUtils.subtypeId, TestUtils.operationCode));
         Assert.assertEquals(operationTemplateActual.getSubTypeId(), operationTemplateActual.getSubTypeId());
@@ -70,7 +74,7 @@ public class ServiceTest extends BaseOperationTemplatePluginTest {
     @Test(dependsOnMethods = "testAddOperationTemplate")
     public void testUpdateOperationTemplate() throws OperationTemplateMgtPluginException {
 
-        OperationTemplate operationTemplate = operationTemplateService.getOperationTemplate(TestUtils.subtypeId, TestUtils.deviceType, TestUtils.operationCode);
+        OperationTemplate operationTemplate = operationTemplateService.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(TestUtils.deviceType, TestUtils.subtypeId, TestUtils.operationCode);
         operationTemplate.setOperationDefinition("{}");
         OperationTemplate operationTemplateActual = operationTemplateService.updateOperationTemplate(operationTemplate);
 
@@ -81,13 +85,30 @@ public class ServiceTest extends BaseOperationTemplatePluginTest {
         Assert.assertEquals(operationTemplateActual.getDeviceType(), TestUtils.deviceType);
     }
 
-    @Test(dependsOnMethods = {"testAddOperationTemplate", "testGetOperationTemplate", "testUpdateOperationTemplate"})
+
-    public void testDeleteOperationTemplate() throws OperationTemplateMgtPluginException {
+    public OperationTemplate getOperationTemplateBySubtypeIdAndDeviceTypeAndOperationCode(String deviceType, String subtypeId, String operationCode) throws OperationTemplateMgtPluginException {
-        operationTemplateService.deleteOperationTemplate(TestUtils.subtypeId, TestUtils.deviceType, TestUtils.operationCode);
+        return operationTemplateService.getOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(deviceType, subtypeId, operationCode);
-        Assert.assertNull(getOperationTemplateBySubtypeIdAndDeviceTypeAndOperationCode(TestUtils.subtypeId, TestUtils.deviceType, TestUtils.operationCode));
+    }
+
+    @Test(dependsOnMethods = "testAddOperationTemplate")
+    public void testGetOperationTemplateCodesByDeviceTypeAndSubTypeId() throws OperationTemplateMgtPluginException {
+
+        Set<String> operationCodes = operationTemplateService.getOperationTemplateCodesByDeviceTypeAndSubTypeId(TestUtils.deviceType, TestUtils.subtypeId);
+        Assert.assertNotNull(operationCodes, "Cannot be null");
+    }
+
+    @Test(dependsOnMethods = "testAddOperationTemplate")
+    public void testGetAllOperationTemplatesByDeviceType() throws OperationTemplateMgtPluginException {
+
+        List<OperationTemplate> operationTemplates = operationTemplateService.getAllOperationTemplatesByDeviceType(TestUtils.deviceType);
+        Assert.assertNotNull(operationTemplates, "Cannot be null");
+        Assert.assertFalse(operationTemplates.isEmpty(), "operationTemplates is empty");
     }
 
-    public OperationTemplate getOperationTemplateBySubtypeIdAndDeviceTypeAndOperationCode(String subtypeId, String deviceType, String operationCode) throws OperationTemplateMgtPluginException {
+    @Test(dependsOnMethods = {"testAddOperationTemplate", "testGetOperationTemplate", "testUpdateOperationTemplate",
-        return operationTemplateService.getOperationTemplate(subtypeId, deviceType, operationCode);
+            "testGetOperationTemplateCodesByDeviceTypeAndSubTypeId", "testGetAllOperationTemplatesByDeviceType"})
+    public void testDeleteOperationTemplate() throws OperationTemplateMgtPluginException {
+        operationTemplateService.deleteOperationTemplateByDeviceTypeAndSubTypeIdAndOperationCode(TestUtils.deviceType, TestUtils.subtypeId, TestUtils.operationCode);
+        Assert.assertNull(getOperationTemplateBySubtypeIdAndDeviceTypeAndOperationCode(TestUtils.deviceType, TestUtils.subtypeId, TestUtils.operationCode));
     }
 }