Code in the Cloud, Programming Google App Engine by Mark C. Chu-Carroll

By Mark C. Chu-Carroll

Probably the most fascinating contemporary adjustments within the computing global is cloud computing. Cloud computing is a dramatic shift in how purposes are built and used---and even in what purposes are. With cloud computing, builders aren't any longer development purposes that run on a user's machine laptop. in its place, they're construction providers at the community that may be utilized by hundreds of thousands of clients even as. Cloud prone are an exhilarating chance for builders: the cloud is a platform for growing companies, a brand new type of program which could succeed in extra clients, and supply these clients with extra services than a computing device program ever may perhaps. construction purposes as cloud providers additionally makes them scalable: cloud functions can simply and easily adapt from working on a unmarried laptop for a unmarried consumer to working on hundreds of thousands of desktops for hundreds of thousands of users.Code within the Cloud will train you what a cloud carrier is, and the way it differs from conventional purposes. it's going to allow you to construct a cloud provider, profiting from the providers that AppEngine makes to be had to you, utilizing iterative improvement of an easy program to lead you thru the several features of AppEngine improvement, utilizing both Python or Java. throughout the strategy of engaged on an easy program, you will know about easy methods to construct an software as a carrier; the way to deal with continual facts utilizing AppEngine; the way to construct dynamic, interactive person interfaces that run in a user's web-browser; find out how to deal with defense in an online software; and the way to engage with different providers operating within the AppEngine cloud.

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Extra resources for Code in the Cloud, Programming Google App Engine

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Go ahead, give it a try. py! So now we can upload it to the App Engine servers. py update to upload it to App Engine. 2. It looks exactly like it did running on the local development server. I sent a few messages using two different usernames and got a beautiful chat transcript. But then I needed to take a break to give my son a bath and put him in bed. When I got back, I sent another message. 3, on the next page. When I sent the new message, all of the older messages were gone! The transcript doesn’t have anything except the new message I just added.

500 Internal Server Error Any error in the server during its process- ing of the request will end up generating a 500 error. In particular, for App Engine services that you implement, the client browser will receive a 500 when your request handlers crash and/or throw an exception. 501 Not implemented The request wants to perform some oper- ation that the server doesn’t support. You’ll see this most often if you do something like misspell the URL in a POST request. 0 printing, April, 2011) 46 M APPING C HAT INTO HTTP You also want to be able to send messages, so you need your browser to be able to talk to the chat room as an active entity and tell the chat room application that you’ve got something to say.

But we don’t really want to have to specify it when we create a message; we want the timestamp to be now—that is, the time when the message was received by the application. ” Because the property is represented by an instance of a Python class, the class can define custom initializer parameters to provide type-specific functionality like auto_now_add without requiring any special primitives. As you’ll see when we look at advanced datastore topics in Chapter 13, Advanced Datastore: Property Types, on page 191, you can define your own new property types and provide your own type specific extensions.

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