Mick Thompson - Getting Started with GEO, CouchDB, and Node.js
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Copyright 2011 David M. Thompson
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Where. Whether it refers to where you have been, where you are, or where you are going, the concept of where is important. Where links data to the physical world. A shopping list can be a very useful collection of data on its own, but that data can be even more useful with more context. If you map the location of the stores needed for each item on the shopping list, then you can create an efficient route to acquire the items on the list. Driving directions, traffic information, and weather can impact the route. All of this data can be fetched based on the location data added to the simple shopping list.
Location can add a new filter or layer of insight into existing data. It makes all kinds of new applications possible. In the past, using location or geographic data meant using complex or at times expensive software. Datasets could be costly or hard to find. Developing using open source tools such as Node.js and CouchDB has recently made working with location data simple and fast.
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Node.js has quickly become a very popular asynchronous framework for JavaScript. It is built on top of the same V8 engine that the Chromium and Google Chrome web browsers use to interpret JavaScript. With the addition of networking and file system API support, it has quickly proved to be a capable tool for interacting with IO in a asynchronous way.
There are many other libraries in several other languages that can accomplish the same asynchronous handling of IO. There are different conventions, schools of thought, and preferences of developers. Node.js uses callbacks for the developer to notified of the progress of asynchronous operations. Callbacks are nothing new for developers accustom to Pythons Twisted library or other similar frameworks. Callbacks can be a very easy and powerful way to manage the flow of an appilication, but as with anything new they also offer an opportunity to trip up a developer. The first thing to keep in mind when getting started with asynchronous development is that execution might not follow the same squence every time.
In order to install Node.js, download the source and build it. The main Node.js web page at http://nodejs.org can be very helpful in linking to downloads, source code repositories, and documentation. The master branch of the repository is kept in a semi-unstable state, so before building check out the most recent tagged version. For example: v0.4.9.
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