The Internet Medium in Java

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The Internet Medium
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Six attributes of the Internet as a medium compound the challenge of delivering performance and scalability The better we understand and appreciate these attributes, the more strategic we can be in meeting the challenge to build Web applications that perform and scale well First, as mentioned earlier, there is potentially a wide audience for Web application providers to manage wider than in any other medium Second, the Web is an interactive medium: Consumers not only receive information, they also submit it Third, the Internet is dynamic in the sense that a given user request does not always result in the same server-side response Fourth, the Internet as a utility is always on and providers have no guarantees about when and how often their information will be accessed Fifth, providing information over the Internet is an integrated process that often depends on the coordination of multiple provider subsystems to deliver information And sixth, providers lack complete control in terms of the delivery of information to consumers: There are many networking elements that exist between provider and consumer, most of which are not controlled by the provider Some of these attributes may seem obvious; some may not In either case, thinking about the details and their implications will prepare you for the solutions part of this book
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Wide Audience
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I'm not going to beat you over the head with the fact that millions of people use the Internet every day That is obvious and the increasing numbers are the primary reason that application architects worry about things like scalability in the first place However, I will inform you of a few things that you may not know or just may not appreciate, yet One is that there is another Internet "audience" to consider, one that is not often addressed This quieter, hidden, but rapidly growing group of Web clients are better known as "bots" If you are familiar with search engine technology, you already know that search engines use automated softbots to "spider" (recursively traverse) the Web and update search engine indices This process has been going on since search engines were first deployed; bots are a simple example of one type of information agent Today's bots are just the tip of the iceberg More sophisticated information agents are just around the corner that will allow users to monitor multiple sites continuously and automatically For example, instead of using the Web interactively to watch and participate in online auctions (like those at eBay and Yahoo), users will configure information agents to watch continuously and bid automatically This is an inevitable and obvious future direction for the Web: People want to do more than sit around watching their monitors all day, manually hunting for information Bots and information agents are particularly fond of things like data feeds, which are information sources that continually change and require monitoring When the Internet was first being commercialized, it was popular to connect real-time data feeds (such as the newswire services) and build access methods to them via Web applications This trend shows no sign of slowing; in fact, it threatens to become much greater as Web applications gradually become data feeds in themselves I've avoided boring, albeit frightening, statistics about the growing number of human Internet users Instead, I've reminded you that there are and will be new types of application clients, not
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just those with two eyes An increasing number of information agents will automate Web querying and a growing trend will be to treat Web applications like data feeds In short, the Web's audience is definitely growing, not to mention changing, and so are its demands What's more, this newer audience is persistent and regular, and does not mind testing the 24x7 feature of the Web and its applications!
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