Event Source Notifications in MFP 7.1 Cordova Applications
Prerequisite: Make sure to read the Push Notifications in Hybrid Applications tutorial first.
This blogpost is here to show you how to write Cordova applications with event source notification functionality.
Event source notifications are notification messages that are targeted to devices with a user subscription. While the user subscription exists, MobileFirst Server can produce push notifications for the subscribed user. These notifications can be delivered by the adapter code to all or some of the devices from which the user subscribed.
To learn more about the architecture and terminology of event-source push notifications refer to the Push notification overview tutorial.
Implementation of the push notification API consists of the following main steps:
On the server side:
- Creating an event source
- Sending notification
On the client side:
- Sending the token and initializing the
- Registering the event source
- Subscribing to/unsubscribing from the event source Displaying a received notification
Notification API - Server-side
Creating an event source
name– a name by which the event source is referenced.
onDeviceSubscribe– an adapter function that is invoked when the user subscription request is received.
onDeviceUnsubscribe– an adapter function that is invoked when the user unsubscription request is received.
securityTest– a security test from the
authenticationConfig.xmlfile, which is used to protect the event source.
An additional event source option:
poll– a method that is used for notification retrieval. The following parameters are required:
interval– the polling interval in seconds.
onPoll– the polling implementation. An adapter function to be invoked at specified intervals.
Sending a notification
As described previously, notifications can be either polled from the back-end system or pushed by one. In this example, a
submitNotifications() adapter function is invoked by a back-end system as an external API to send notifications.
submitNotification function receives the
userId to send notification to and the
A user subscription object contains the information about all of the user’s subscriptions. Each user subscription can have several device subscriptions. The object structure is as follows:
If the user has no subscriptions for the specified event source, a null object is returned.
WL.Server.createDefaultNotification API method creates and returns a default notification JSON block for the supplied values.
notificationText- The text to be pushed to the device.
Badge(number) - A number that is displayed on the application icon or tile (available only in iOS and Windows Phone).
custom- Custom, or Payload, is a JSON object that is transferred to the application and that can contain custom properties.
WL.Server.notifyAllDevices API method sends notification to all the devices that are subscribed to the user.
Several APIs exist for sending notifications:
WL.Server.notifyAllDevices(userSubscription, options)- to send notification to all user’s devices.
WL.Server.notifyDevice(userSubscription, device, options)- to send notification to a specific device that belongs to a specific user subscription.
WL.Server.notifyDeviceSubscription(deviceSubscription, options)- to send the notification to a specific device.
Notification API - Client-side
trueif push notifications are supported by the platform, or
WL.Client.Push.isSubscribed(alias)– returns whether the currently logged-in user is subscribed to a specified event source alias.
Set up push notifications, with the callback function defined in
WL.Client.Push.onReadyToSubscribe to notify that a device is ready to subscribe to push notifications:
When a push notification is received by a device, the callback function defined in
WL.Client.Push.registerEventSourceCallback is invoked:
If the application was in background mode (or inactive) when the push notification arrived, this callback function is invoked when the application returns to the foreground.
Click to download the sample project.
Sending a notification
To get the app running:
- Create a MFP Cordova Application and select the platforms you would like to be supported by your app
Copy contents in sample app to your Cordova app (PushNotifications/www/, application-descriptor.xml)
Follow instructions in Push Notifications Overview to set up corresponding platform
Create Local MFP Server, or Use Remote MFP Server
- Create http adapter
Copy contents in sample app to your Cordova app (backendServer/PushAdapter/, backendServer/server/conf/authenticationConfig.xml)
Push Adapter to server
- Run app on corresponding device
- To test the sample, go into
/backendServerto call the adapter in the CLI. Use the username you entered to login to the app:
Note that for push notifications to work on an emulator, it must be using one of the “Google APIs…” targets, as opposed to the regular “Android x.x.x” targets. You can check what target an emulator is using by opening the AVD manager and looking at the value in the “Target Name” column.