By Dan Sanderson
I have labored with the App Engine for approximately six months and feature won so much of my wisdom from the web documentation. I want I had had this publication while i began. this is often the simplest clarification i have noticeable of entities and the way they relate to transactions. The code examples in Python and Java are tremendous important and provides nice perception into how the 2 languages process the App Engine abstractions. The sections on information modeling and Django integration are fairly sturdy. not just did this publication fill in gaps in my wisdom, however it is satisfactorily special that i am definite i'm going to preserve it on my table as a reference. i have attempted the opposite App Engine books and this is often by means of some distance the easiest. in case you have any curiosity within the App Engine, begin the following.
Read or Download Programming Google App Engine: Build and Run Scalable Web Apps on Google's Infrastructure (Animal Guide) PDF
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Additional resources for Programming Google App Engine: Build and Run Scalable Web Apps on Google's Infrastructure (Animal Guide)
Python users using Windows or Mac OS X can get the Python SDK in the form of a GUI application. Both SDKs are also available as ZIP archives of command-line tools, for using directly or integrating into your development environment or build system. Each SDK includes a development web server that runs your application on your local computer and simulates the runtime environment, the datastore, and the services. The development server automatically detects changes in your source files and reloads them as needed, so you can keep the server running while you develop the application.
If a task fails, the queue retries the task until it succeeds. You can configure the rate at which queues are processed to spread the workload throughout the day. A queue performs a task by calling a request handler. It can include a data payload provided by the code that created the task, delivered to the task’s handler as an HTTP request. The task’s handler is subject to the same limits as other request handlers, including the 30-second time limit. An especially powerful feature of task queues is the ability to enqueue a task within a datastore transaction.
Of course, you can implement your own account mechanism instead of using Google Accounts. Using Google Accounts has advantages and disadvantages—the chief advantage being that you don’t have to implement your own account mechanism. If a user of your app already has a Google account, the user can sign in with that account without creating a new account for your app. If the user accesses the application while signed in, the app loads the user’s preferences data and uses it to render the page. The app retrieves the preferences data in two steps.
Programming Google App Engine: Build and Run Scalable Web Apps on Google's Infrastructure (Animal Guide) by Dan Sanderson