Notification Manager (Embedded)

To get instance of notification manager

BangDB Notification Manager (BangDBEnv *env, int nthreads = 4);

This returns an instance of notification manager given reference to BangDBEnv and number of threads that should be given to the manager to manage the notifications. See BangDBEnv for more details on the db environment.

To create or register a notification

int registerNotification(const char *notif_meta);

It takes notification metadata as input. Example of notification metadata.

 {
   "notifid":12345,
   "name":"notif1",
   "msg":"users msg",
   "pri":1,
   "mailto":[],
   "endpoints":[
      "http://192.168.1.3:10101/account"
   ],
   "schemaid":1234,
   "freq":1
}

It returns -1 for error else 0.

To drop or deregister a notification

void deregisterNotification(long notifid, short state);

state = 0 means pause, 1 means activate, -1 means delete completely.
notifid is the unique id which the user has provided while registering the notification. This API puts the notification in the queue for processing.

int put(long notifid, long pkts, long orig_streamid, const char *notif);

pkts is the pk (timestamp) of the data which is in stream. This checks if notification is needed or not and if needed, then it queues the notifid for further work. It return 0 for success. To get a list for notification generated based on given condition and filter query. This is exactly similar to scanDoc on BangDBTable. Please see DataQuery for more details on effective and right way of scan.

ResultSet * scanDoc(
   ResultSet * prev_rs,
   FDT * pk_skey = NULL,
   FDT * pk_ekey = NULL,
   const char * idx_filter_json = NULL,
   ScanFilter * sf = NULL
);

It returns ResultSet if successful else NULL.

To get a list of registered notifications, call this function. This takes filter query and can do recursive scans. See DataQuery for more details.

ResultSet * scanRegisteredNotif(
   ResultSet * prev_rs,
   FDT * pk_skey = NULL,
   FDT * pk_ekey = NULL,
   const char * idx_filter_json = NULL,
   ScanFilter * sf = NULL
);

It returns NULL for error.

To close Notification Manager

void close Notification Manager (CloseType ctype = DEFAULT_AT_CLIENT);

To create NotificationManager object

public BangDBNotificationManager(BangDBEnv bdbenv)

This returns an instance of notification manager given reference to BangDBEnv and number of threads that should be given to the manager to manage the notifications. See BangDBEnv for more details on the db environment.

To register a notification

public int registerNotification(String notif_meta)

Notif_meta is a json string which looks like:

{
                      "notifid":12345,
                      "name":"notif1",
                      "msg":"users msg",
                      "rule":"notification rule/condition",
                      "pri":1,
                      "mailto":[], 
                      "endpoints":[],
                      "schemaid":1234,
                      "freq":1
                    }

It returns -1 for error else 0

To de-register or delete a registered notification

public int deregisterNotification(long notifid, short state)

The notifid is unique id provided by user when the notification was registered and state = 0 means pause, 1 means activate, -1 means delete completely. This API puts the notification in the queue for processing.

public int put(long notifid, long pks, long orig_strmid, String notif)

pkts is the pk (timestamp) of the data which is in stream. This checks if notification is needed or not and if needed, then it queues the notifid for further work. Queued item must be sent to the respective destination. If it doesn't need to send the notification then it calls send_notification with op = 0 to update the cnt, lts etc. and returns - it doesn't queue.

To get the list for notification generated based on given condition and filter query. This is exactly similar to scanDoc on BangDBTable. Please see DataQuery for more details on effective and right way of scan.

public ResultSet scanRegisteredNotif(
                      ResultSet prev_rs,
                      long k1,
                      long k2,
                      String idx_filter_json,
                      ScanFilter sf
                      )

To close the notification manager

public int closeNotificationManager(CloseType closetype)