Is there a recommended strategy for checking of notifications within my AngularJS app?
By 'notification' I'm talking about message alerts that are to be displayed to a user when they're logged into the application.
My plan is to notify the user of unread notifications in the app's NavBar as shown below:
My app communicates with my restFul API (written using Node.js, express, MongoDB), so I anticipate that new notification will be written to a MongoDB collection with details the user the notification is intended for.
What I'm unsure about is how the AngularJS application will check for notifications once a user is logged on. I could call my API for unread notifications every time the user navigates from one path to another but that seems simplistic and it wouldn't work if a new notification occurs whilst a user is viewing a page.
Another way would be some sort of timer system that checked, say, every 30 seconds. But this would results in unnecessary polling of my API when there aren't any new notification for a user.
So, wondering if there is a recommended strategy. Thanks for your help.
Polling is a solution but it is very inefficient. The solution to your problem are websockets. Websockets is a technology that provides a full-duplex bidirectional communication between your clients and your server. So you can send messages from your server to your connected clients. Your server maintains an array of connected clients and you just have to know which ID you need to send a message to it.
For your stack, the best solution I have came to is Socket.io http://socket.io
It also have cool features. For example, you can "observe" models, so if a model change in your database, for example an update to a user profile is made, you can trigger an event and automagically send a message to your client. This client get and handles the notification and do something, like put a badge on your alerts icon.
Hope this is useful for you.
Related
I’m implementing a solution that will notify users in a scenario very similar to a chat.
I’ll be using SignalR and Azure Notifications Hub for the job.
There are two scenarios that I need to address:
Notifying users that are currently connected and using my app - either web or mobile
Notifying users who are NOT currently using the app
I think SignalR will work just fine for the first scenario which is fairly easy.
My question is handling the second scenario which will require Azure Notifications Hub.
In a typical chat app, though it’s not real-time, there’s little delay before an inactive user receives a notification for a new message he receives.
How do I “trigger” a process that will send a notification through Azure Notifications Hub?
I can think of two ways to handle this:
Figure out a way to keep a list of users who currently have an active connection to my app. These users can be notified through SignalR. So after each new message, I could trigger a notification process that will use Azure Notifications Hub for users who are NOT in the active users list i.e. those who are NOT actively connected to my app.
Another approach would be to assume no one is connected. I could create an Azure Functions app that runs every minute to check on messages that are NOT opened. It would then compile a list of users who need to be notified and call Azure Notifications Hub process to notify them.
I don’t want to reinvent the wheel and want to tap into the experience of those who’ve already implemented a solution like this.
I’m currently leaning towards the second approach. I’d appreciate your suggestions, especially on approaches that I haven’t thought of. Thanks!
I have Notifications working in a .NET Core web application using the Abp Boilerplate framework. I've also implemented EmailRealTimeNotifier so that after the Push notification is sent, an Email is sent as well.
I'd like to give Users of the application the ability to choose as a preference, whether they want to receive
Push Notifications Only
Email Notifications Only
Both Push and Email Notifications
I figure I can refactor the EmailRealTimeNotifier class used to send Emails with some clever logic hopefully. But I'm stuck on where and or how I would implement code to prevent the Push Notification from firing off.
You can save the settings in the Settings per user provided by abp, read those settings and based on that send the emails or push notifications.
We already have a system in place that uses Restful APIs in order to send let's say SMS. All of our clients are using our server to send their requests to Rest API so we drop connections except our server IP to handle authentication.
Now policy has been changed. We want to expose our APIs to the outside world. We now want to be able to push to user under specific circumstances. Let's say that I want to send a delivery report to the user when SMS has been delivered. Or when something has been scheduled for a specific time, when that time arrives user get notified.
How to handle these notifs? Has anyone used the same or similar approach?
Assuming you can reach your clients back via HTTP. The model to do this is to use callbacks. When someone posts a scheduled job on your server, they should also post a callback URI where your server can notify when the job is complete.
Sample below:
https://schedulingSevrer.com/runSchedule?callback=http://clientserver.com/reportStatusHere
So when the job is done your callback will be like
http://clientserver.com/reportStatusHere?jobId=12345&status=complete
Or if your clients are mobile apps on Andorid you can use the Google Push notifications.
I want to notify a user if any other user wants to be friend with him. The only ways I can currently think of is notify through push notifications or recipients device will keep polling server for new information at certain frequency or device will check for new information only when it launches.
I have some problems with Push Notifications method to send requests
If device is offline only last notification will get processed
If app is not running, push notification will get delivered in Notifications and I don't know how can I extract information from there to my app.
Also, if device keeps polling for new information number of API calls will be very high which is not cost effective and alternately if device asks for new information only at start up launch it will not get real time updates.
Is there any way I can send information to device as soon as information is available?.
Any suggestions will be appreciated
Have you taken a look at Urban Airship?
They have a great framework set up for queueing and receiving push notifications, even when your app is offline. You can either queue the notification from the app itself or from your server hosting your account data. They also have the ability to compose and push rich content notifications.
The basic account for small apps gets 1 million free push notifications per month. Everything beyond that is fractions of a penny.
Hope this helps, Cheers!
Notifications is one such thing which can drain down battery if one takes polling route, thats one of the reasons Apple developed Push Notifications. I would recommend try to use Apple Push notification as much as possible as it would have been optimized to hell. If you have different flows for when the app is active & for when the app is not active (reg. notifications) you can do it like so -
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
if(application.applicationState == UIApplicationStateActive) {
// app active.
}
else {
// app not active
}
}
But if in any case Apples Technology does not suite ones needs one could always use third party services. In this case there are a few that can really help you.
Pusher has an Objective-C library and a REST API (along with a number of libraries) that would let you push realtime updates from your server into an iOS application.
OpenPush is another such service. Also check this link, here's a compiled list of realtime technologies in which I'm sure you'll also find technologies that meet your requirements.
All of these are better than polling.
Is there any way I can send information to device as soon as information is available?. Any suggestions will be appreciated
user1 wants to add user2 as friend.
from device, post information to server, in your webscript, process the friend request of user1 to user2 (insert/update information to database etc), when done. send the notification to user2. this will work if the device is offline, user2 will have real time update, if the app is running. you can run scheduled request that will check new notifications. say every 2 minutes, a method in your app runs. but thats not a very good idea. A reload button inside the app to check notification is better.
What you would normally do is to use the push request as a means of informing your app that new data is available. The user clicks on the push notification - the app is opened with the
-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
you register that there was push, query your server and the server let's your app know that this list of new friend requests are there.
You can't really do the queuing of messages on the device - and you don't need to. It's much easier to just store the info on your server until the app queries it.
i've been looking around to find a simple library or a client/server sample code for implementing a messaging system between users of my IOS clients app and a REST server. I would need that each user has an incoming and sent messages view. This view would display the conversations grouped by user. For example, using a table view where each cell represent a thread between the 2 distinct users, selecting a user's conversation it would push a new view that would display all the messages between the two users.
I have to say that i didn't found much, this is a mix of libraries and front ends:
an XMPP objective-c library: https://github.com/robbiehanson/XMPPFramework, but i don't really want an IM behavior
Acani chat, https://github.com/acani/AcaniChat seems promising but waiting for the acani chat server, i could use the front end
another chat https://github.com/honcheng/iOS-nodechat
MailCore, an IMAP api for objective-c: https://github.com/mronge/mailcore . i would need to relay on a mail server, create emails for each user and ... too much!
too bad there isn't any iMessage API
dont want to send a SMS or an email
push notification it's not a must to start
maybe coding a simple REST service for publishing and retrieving messages to and from a user would be the best approach? i'm i missing something?
thanks!!