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Urgent and time-sensitive data (e.g., storm warning) Updates (e.g., count of new messages) Continuous data (e.g., Twitter client, stock ticker)
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Introducing the Push Notifications Architecture
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Windows Phone push notifications involve three players, a phone application, a Microsoft service, and a remote web-based service, as illustrated in Figure 17 3. At the heart of push notifications is a service provided by Microsoft called, very appropriately, Microsoft Push Notification Service (MPNS). MPNS provides a dedicated, resilient, and persistent channel for pushing a notification to a mobile device, according to MSDN documentation. This service is hosted on Microsoft s Azure cloud operating system and is responsible for seamlessly establishing a channel of communication between a Windows Phone 7 device and an application that provides notification data to it. Typically, notifications to Windows Phone 7 devices are provided by a web service (or a cloud service, as often seen in Microsoft documentation). These cloud services are generally accessible via standard web protocols, such as REST and SOAP, aside from MPNS for data retrieval and updates. Naturally, you may be wondering what happens when MPNS becomes unavailable for some technical reason. At the moment, the answer is that should that happen, push notifications will not
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CHAPTER 17 PUSH NOTIFICATIONS
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reach their destination, i.e., they will be simply dropped. Hence, push notifications should never be counted on as a reliable form of message delivery.
Figure 17 2. A tile notification
The Life Cycle of a Notification
Let s suppose that you re building a mobile stock trading application that consists of a central web service, which gathers and analyzes trading data, and an application running on Windows Phone 7 devices, which displays data to users. Suppose you want the application to notify users whenever there is a significant jump in the value of Microsoft stock, such as might occur right after the official launch of Windows Phone 7. Architecturally seaking, how would it go about doing that First, the application would need to take advantage of Push Notification Services, since this will allow it to keep the user updated on the market conditions even if the user is not constantly running the stock trading app on her Windows Phone 7. Second, to enable push notifications on Windows Phone 7, a communication channel for notifications must be created between the application and the web service that is collecting stock trading data. In the world of push notifications, a communication channel is represented by a URI that contains all of the information necessary for notifications to reach their destination. A Windows Phone 7 client must request this channel be created, and obtain the URI associated with that communication channel. Third, the URI of this communication channel must be communicated to the web service that will deliver, or push notifications about the market conditions to Windows Phone 7 clients. Once this third step is complete, all three types of push notifications are available to the stock trading application.
CHAPTER 17 PUSH NOTIFICATIONS
Figure 17 3 provides detailed visual representation of how a Windows Phone 7 client application would be able to receive stock trading alerts from the server using MPNS. The steps are sequentially numbered and each numbered step is described in detail below: 1. 2. 3. 4. 5. Windows Phone 7 application contacts MPNS and requests for communication channel inside MPNS to be created. MPNS responds with the URI of communication channel, which is unique for a given Windows Phone 7 device and an application on that device. Windows Phone 7 application communicates the URI of the channel created in Step 2 to the service providing stock quotes. The stock quotes service publishes updates to the URI communicated to it in Step 3. MPNS routes the updates to the proper Windows Phone 7 device and application on that device.
When the service needs to send notifications to its clients, it contacts MPNS by making a POST request to the unique URIs created for each client (Step 4 in the outline above). These POST requests have to conform to a predefined XML schema set by Microsoft. The type of notification sent (toast, tile, or raw) is determined by one of the header values inside the POST request namely, the "XNotificationClass" header, and you will see how to use this header momentarily. In the sections that follow, we ll show you how to write code for the steps that have just been described. Using the Windows Phone 7 emulator, you ll implement an application with both toast and tile notifications. When programming Windows Phone 7 push notifications, perhaps the most common error that occurs is the PayloadFormat error. Generally, that means that the XML or message format received from the MPNS does not conform to the expected format. Things to check in that case would be whether an XML format expected for tile notifications is used for toast notifications or vice versa.
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