The Servlet API and NIO:Together at last
Think it\'s impossible to combine NIO and the Servlet API? Think again. In this article, Java developer Taylor Cowan shows you how to apply the producer/consumer model to consumer nonblocking I/O, thus easing the
Tutorial Details:
In this article, you\'ll learn how to work around the Servlet API\'s aversion to nonblocking I/O to create a Servlet-based Web server that implements NIO. We\'ll then see how this server scales against a standard I/O server (Tomcat 5.0) in a multiplexed Web server environment. In keeping with the realities of life in the enterprise, we\'ll focus on how NIO compares to standard I/O when an exponentially increasing number of clients retain their socket connections.
The Servlet API and NIO
Nonblocking reads and writes are essential to NIO, but they don\'t come trouble free. A nonblocking read makes no guarantee to the caller besides the fact that it won\'t block. The client or server application may read the complete message, a partial message, or nothing at all. On the other hand, a nonblocking read might read more than enough, forcing an overhead buffer for the next call. And, finally, unlike streams a zero byte read does not indicate that the message has been fully received.
These factors make it impossible to implement even a simple readline method without polling. All servlet containers must provide a readline method on their input streams. As a result, many developers have given up on building a Servlet-based Web application server that implements NIO. Fortunately, there is a solution; one that combines the power of the Servlet API and the multiplexed I/O of NIO.
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Together at last
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Together at last
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