Download e-book for kindle: Code in the Cloud by Mark C. Chu-Carroll


By Mark C. Chu-Carroll

ISBN-10: 1934356638

ISBN-13: 9781934356630

One of the main fascinating contemporary alterations within the computing international is cloud computing. Cloud computing is a dramatic shift in how functions are built and used---and even in what purposes are. With cloud computing, builders aren't any longer construction purposes that run on a user's computing device laptop. as a substitute, they're construction companies at the community that may be utilized by hundreds of thousands of clients whilst.

Cloud prone are an exhilarating chance for builders: the cloud is a platform for growing prone, a brand new form of software which could achieve extra clients, and supply these clients with extra services than a computer program ever may well. construction purposes as cloud prone additionally makes them scalable: cloud functions can simply and easily adapt from operating on a unmarried computing device for a unmarried consumer to working on millions of pcs for thousands of clients.

Code within the Cloud will educate you what a cloud provider is, and the way it differs from conventional purposes. it is going to provide help to construct a cloud carrier, benefiting from the providers that AppEngine makes on hand to you, utilizing iterative improvement of an easy software to lead you thru different elements of AppEngine improvement, utilizing both Python or Java.

during the strategy of engaged on an easy program, you'll find out about find out how to construct an program as a carrier; how you can deal with power info utilizing AppEngine; the best way to construct dynamic, interactive consumer interfaces that run in a user's web-browser; tips to deal with safeguard in an internet software; and the way to have interaction with different prone working within the AppEngine cloud.

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Example text

Now we need to think a bit about UI issues. How is the user going to be able to POST data to our application? We need to provide a way to do that. The easiest is to create a form in the page that’s sent when a user asks to view the chat room. So the chat page will have a title at the top, and then it will have a transcript of what’s in the room, and then, at the bottom, we’ll have an entry form that takes the user’s name and the message that the user wants to post. To implement this in App Engine, we need to build one RequestHandler that implements GET for the chat room content and then build another RequestHandler that receives the POSTs and adds things to the chat.

You can’t build a cloud application without thinking about how you’re going to handle multiple users and how you’re going to handle data for multiple users. A chat application is simple but pretty typical. To build a chat, we need to think about interactions between multiple users, we need to store and retrieve persistent data, and we’ll have multiple streams of data for different discussions. On top of that, it’s easy to build a simple version and then gradually add features that demonstrate more and more of the capabilities of App Engine.

The cloud is a whole different world. The rules that you’re used to— even things as simple as the ways that variables work—are very different. This program isn’t running on your computer; it’s running on who-knows-how-many computers, which are living who-knows-where Download from Wow! com> W HY D IDN ’ T C HAT W ORK ? in some data center connected to the network. We wrote a cloud application and uploaded it using Google App Engine’s service. From the moment we did that, the program was running.

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Code in the Cloud by Mark C. Chu-Carroll

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