*/
public static void initializePersistenceManager() {
File usageAgentConfigFile = new File(CarbonUtils.getCarbonConfigDirPath() + File.separator +
StratosConstants.MULTITENANCY_CONFIG_FOLDER + File.separator + Util.USAGE_THROTTLING_AGENT_CONFIG_FILE);
persistenceManager = new UsageDataPersistenceManager(new UsageAgentConfiguration(usageAgentConfigFile));
//start a thread for persisting bandwidth Usage statistics
if("true".equals(ServerConfiguration.getInstance().getFirstProperty("EnableMetering"))){
persistenceManager.scheduleBandwidthUsageDataRetrievalTask();
persistenceManager.scheduleUsageDataPersistenceTask();
}