XML Parsing in a Producer-Consumer Model

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Tutorial: XML Parsing in a Producer-Consumer Model

XML plays a vital role in integrating business-to-business applications. To parse XML files, these applications use either a Simple API for XML (SAX) or a Document Object Model (DOM) parser. Parsing in single-threaded applications is straightforward.

Tutorial Details:

the applications often create a dedicated thread to parse XML, serving many concurrently running threads with the parsed data. This describes one implementation of parsing XML in concurrent applications.
Design Approach
Based on producer-consumer concurrent programming concepts, a dedicated thread acts as producer to parse the XML. A group of threads act as consumers. As the producer thread parses XML data, it stores the data in a shared data structure for the consumer threads to pick up for further processing. To maximize throughput and minimize memory usage, this design uses a special queue for the producer and the consumers to store and to retrieve parsed data, respectively.
XML Parsing
This design uses the SAX API for parsing XML file for the following reasons:

The API reads XML data quickly and efficiently.
It does not construct any internal data representation of XML. Instead, it simply delivers data to the application as it encounters XML elements.
The SAX API fits very well with the producer-consumer model

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