android - PUSH Notifications for >1000 devices through GCM Server(Java) -


i have gcm-backend java server , i'm trying send users notification msg. approach right? split them 1000 each time before giving send request? or there better approach? 

    public void sendmessage(@named("message") string message) throws ioexception {      int count = ofy().load().type(registrationrecord.class).count();      if(count<=1000) {         list<registrationrecord> records = ofy().load().type(registrationrecord.class).limit(count).list();         sendmsg(records,message);     }else     {         int msgsdone=0;         list<registrationrecord> records = ofy().load().type(registrationrecord.class).list();          {             list<registrationrecord> regidsparts = regidtrim(records, msgsdone);             msgsdone+=1000;             sendmsg(regidsparts,message);         }while(msgsdone<count);        }    }

the regidtrim method

   private list<registrationrecord> regidtrim(list<registrationrecord> wholelist, final int start) {      list<registrationrecord> parts = wholelist.sublist(start,(start+1000)> wholelist.size()? wholelist.size() : start+1000);     return parts; }

the sendmsg method 

    private void sendmsg(list<registrationrecord> records,@named("message") string message) throws ioexception {      if (message == null || message.trim().length() == 0) {         log.warning("not sending message because empty");         return;     }      sender sender = new sender(api_key);     message msg = new message.builder().adddata("message", message).build();      // crop longer messages     if (message.length() > 1000) {         message = message.substring(0, 1000) + "[...]";     }     (registrationrecord record : records) {         result result = sender.send(msg, record.getregid(), 5);          if (result.getmessageid() != null) {             log.info("message sent " + record.getregid());             string canonicalregid = result.getcanonicalregistrationid();             if (canonicalregid != null) {                 // if regid changed, have update datastore                 log.info("registration id changed " + record.getregid() + " updating " + canonicalregid);                 record.setregid(canonicalregid);                 ofy().save().entity(record).now();             }         } else {             string error = result.geterrorcodename();             if (error.equals(constants.error_not_registered)) {                 log.warning("registration id " + record.getregid() + " no longer registered gcm, removing datastore");                 // if device no longer registered gcm, remove datastore                 ofy().delete().entity(record).now();             } else {                 log.warning("error when sending message : " + error);             }         }     } }

we can not send more 1000 push notification @ time.i searched lot not result did same approach split whole list in sub lists of 1000 items , send push notification.


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