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In this session we are going to take a look of Windows Azure features that can help us to write better applications for Windows 8. A Metro style app (and not only) need to communicate with different services and load different resources from different locations from internet. Windows Azure is a very good place to host and store these resources.
Citation preview
How to use Windows Azure features on
Windows 8
Radu [email protected]
http://vunvulearadu.blogspot.com
How to use Windows Azure features on
Windows 8
Radu [email protected]
http://vunvulearadu.blogspot.com
• A short introduction in Metro App • Push Notifications• Scenario 1• Scenario 2• Scenario 3• Shared Access Signature• Scenario 4• Scenario 5• Conclusion
Agenda
• Focus on user experience
Metro Style application
• Focus on user experience• Consistent UI through all the applications
Metro Style application
• Focus on user experience• Consistent UI through all the applications• Do one think, but do it best
Metro Style application
• Tables• Blobs• Queues• Service Bus• SQL Azure• Push Notifications• Shared Access Signature• Web roles• Worker roles• Cache roles• Virtual Machines roles• ... and a lot more
What does Windows Azure offers to us
• Using this mechanism we can send toasts, badges, tiles and row notifications to the client application
• The send request notifications can be send from a cloud service
Push Notifications
Metro Style App
Cloud Service
Windows Push Notification Service
Notification Client Platform
Scenario 1
Windows Azure
• Use table storage to store what each patient eat at each meal
• The price for storing data in table storage is very low
Problem• How user can have limited access to only one part of the
table ?
Scenario 1 – Azure Tables
Timestamp Partition Key Row Key … … …
2005-10-30 T 10:45 UTC
Client ID Meal type
Problem• How user can have limited access to only one part of the
table?
Solution• We can use Shared Access Signature
• What we can do with Shared Access Signature• Limit access of the user to only a specific numbers of
tables• Limit access to a specific partition key and row key
intervals• Limit what kind of actions a user can do on the table• Give access to a resource for a specific time interval
Scenario 1 - Azure Tables + SAS
• Limit user access to a specific Windows Azure resource• Types of resources:
• Tables • Queues• Blobs and containers
• You don’t need to know or register user LIVE account• The only thing that you share with the user is a token• User can access your resource based on a token
What is Shared Access Signature
• Create the access policySharedAccessTablePolicy tablePolicy = new SharedAccessTablePolicy() {
Permissions = SharedAccessTablePermissions.Query | SharedAccessTablePermissions.Add,
SharedAccessExpiryTime = DateTime.UtcNow + TimeSpan.FromHours(1)
};• Assign permissionsTablePermissions tablePermissions = new TablePermissions(); tablePermissions.SharedAccessPolicies.Add(
"Client1", tablePolicy);
myTable.SetPermissions(tablePermissions);• Generate the access token signaturetableToken = myTable.GetSharedAccessSignature(
new SharedAccessTablePolicy(), "Client1_1", 10, 0, 19, 100);
How to create a SAS for Azure Tables
• Create the access signaturevar sharedAccessSignature = myBlob.GetSharedAccessSignature(
new SharedAccessPolicy() {
Permissions = SharedAccessPermissions.Write | SharedAccessPermissions.Read,
SharedAccessExpiryTime = DateTime.UtcNow + TimeSpan.FromHours(1);
} • Generate access URLstring sharedAccessSignatureUri = blob.Uri.AbsoluteUri + + sharedAccessSignature;• Use the access signaturevar storageCredentialsSAS = new StorageCredentialsSharedAccessSignature( sharedAccessSignature); var blobClient = new CloudBlobClient(
myAccount.BlobEndpoint, storageCredentialsSAS);
var myBlob = blobClient .GetBlobReference(“myContainer/firstBlob.txt”); string currentContentOfBlob = myBlob.DownloadText(); myBlob.UploadText(“New text appended”);
How to create a SAS for Azure Blobs
• Create the access signatureSharedAccessQueuePolicy sharedAccessPolicy = new SharedAccessQueuePolicy() {
Permissions = SharedAccessQueuePermissions .ProcessMessages, SharedAccessExpiryTime = DateTime.UtcNow + TimeSpan.FromHours(1) };string policyIdentifier = "QueuePolicy1"; QueuePermissions queuePermissions= new QueuePermissions(); queuePermissions.SharedAccessPolicies.Add(
policyIdentifier, sharedAccessPolicy);
myQueue.SetPermissions(queuePermissions);• Generate access token signaturestring accessSignature = myQueue.GetSharedAccessSignature(
new SharedAccessQueuePolicy(), policyIdentifier);
How to create a SAS for Azure Queues
Scenario 2
Windows Azure
• Store all content on Blob Storage• Cheap• Scalable • Can stream any type of content• Multiply devices of the same client can access the same
resources based on the Shared Access Signature• We can send the access token by email
Scenario 2 – Blob Storage
Scenario 3
Windows Azure
• Each document for processing a command is send to Azure queue
• The message from the queue can be consumed by the core application that process the message
• Limited access based on Shared Access Signature• The user that generate the requests will not be able to
read or pop any kind of messages from the queue
Scenario 3 – Azure Queues
How to access Windows Azure content?
Proxy
(1)
(2)
Web Role
Shared Access Signature
(1)
(3)
Web Role (2) (4)
• We are a well know photograph• We decide that we what to share our pictures with peoples that own a
Windows 8 tablet all around the world • Based on a subscriptions for each album we hope to make money• An album can contain 10 to n photos
How can we share this content with our clients?
Scenario 4
• A simple solution is using blobs plus Shared Access Signature• For each client we create an access token that allow clients to access the
album for which they already paid• Over this structure we create a web-application that allow clients to
download the albums based on a token• We can use the token that is generated by Shared Access
Signature
Scenario 4 - Blobs
Stock
• Let’s imagine an application that will display stock reports for each week• This information is generated based on a lot of computation power • Because of this the company decides to sell this valuable content based on
a weekly subscriptions• A client can have access only to information for the weeks that he paid• The client want to access this content from a Metro app created by us but
he also want to import this data in his own systems
Scenario 5
• Store all the weakly report information on Azure Tables
• Create a service that give the user the ability to access report data based on a username and password
• Update and manage the username list and what reports they can access
Scenario 5 – Azure Tables
• Store all the weakly report information on Azure Tables
• Create a service that give the user the ability to access report data based on a username and password
• Update and manage the username list and what reports they can access
• Define a Shared Access Policy based on partition key and row key
Partition Key – Week unique id (201234)Row Key – Report name
Scenario 5 – Azure Tables
Conclusion
Conclusion
Metro style apps are great to create a consistent, elegant & compelling user experience
