Add caching layer for DeviceStatusManagementServiceImpl

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/metadata/mgt/DeviceStatusManagementServiceImpl.java

@@ -18,6 +18,8 @@
 
 package io.entgra.device.mgt.core.device.mgt.core.metadata.mgt;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import com.google.gson.Gson;
 import com.google.gson.JsonObject;
 import com.google.gson.reflect.TypeToken;
@@ -42,6 +44,7 @@ import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 
 public class DeviceStatusManagementServiceImpl implements DeviceStatusManagementService {
@@ -54,6 +57,10 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
 
     private final Gson gson;
 
+    private static final Cache<String, List<AllowedDeviceStatus>> cache = CacheBuilder.newBuilder()
+            .expireAfterWrite(5, TimeUnit.HOURS)
+            .build();
+
     private DeviceStatusManagementServiceImpl() {
         this.metadataDAO = MetadataManagementDAOFactory.getMetadataDAO();
         this.gson = new Gson();
@@ -282,27 +289,29 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
             log.error(msg);
             throw new IllegalArgumentException(msg);
         }
-        MetadataManagementService metadataManagementService = new MetadataManagementServiceImpl();
-        Metadata metadata = metadataManagementService.retrieveMetadata(MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
-        String metaValue;
-        if (metadata != null) {
-            metaValue = metadata.getMetaValue();
-        } else {
-            List<DeviceStatusItem> statusList = getDefaultDeviceStatus();
-            metaValue = gson.toJson(statusList);
-            addDefaultDeviceStatusFilters(tenantId);
+        List<AllowedDeviceStatus> allowedDeviceStatus = cache.getIfPresent(Integer.toString(tenantId));
+        if (allowedDeviceStatus == null) {
+            MetadataManagementService metadataManagementService = new MetadataManagementServiceImpl();
+            Metadata metadata = metadataManagementService.retrieveMetadata(MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
+            String metaValue;
+            if (metadata != null) {
+                metaValue = metadata.getMetaValue();
+            } else {
+                List<DeviceStatusItem> statusList = getDefaultDeviceStatus();
+                metaValue = gson.toJson(statusList);
+                addDefaultDeviceStatusFilters(tenantId);
+            }
+            Type listType = new TypeToken<List<AllowedDeviceStatus>>() {
+            }.getType();
+            allowedDeviceStatus = gson.fromJson(metaValue, listType);
+            cache.put(Integer.toString(tenantId), allowedDeviceStatus);
         }
-        Type listType = new TypeToken<List<AllowedDeviceStatus>>() {
-        }.getType();
-        List<AllowedDeviceStatus> statusList = gson.fromJson(metaValue, listType);
-
-        for (AllowedDeviceStatus status : statusList) {
+        for (AllowedDeviceStatus status : allowedDeviceStatus) {
             if (deviceType.equalsIgnoreCase(status.getType())) {
                 List<String> allowedStatus = status.getStatus();
                 return allowedStatus.contains(deviceStatus);
             }
         }
-
         return false; // Device type not found in metadata
     }