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<title>Back End Examples</title>
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<body bgcolor=ffffff>
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<h2>Back End Examples</h2>
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<p>
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Here are some examples of the "back ends" that could be used by
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various types of project.
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<p>
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<b>SETI@home with local data servers</b>
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<ul>
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<li> A <b>splitter program</b> generates data files. For each data
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file, calls the BOINC server library to create a workunit record and
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several result records, and stores the data file on disk of a data
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server.
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<li> A <b>garbage collector</b> program deletes data files for which
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enough results have been returned.
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Generates new result records as needed.
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<li> A <b>result handler</b> program checks for new results. Parses
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result files, and transfers contents to a separate "science database".
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Does redundancy checking, and marks result records as valid or invalid.
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</ul>
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<p>
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<b>SETI@home with remote data servers</b>
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<p>
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As above, but the splitter program writes data files to DLT tape.
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The result records are generated, using the URL of a selected data
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server.
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The tape is mailed to the data server.
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An operator at the data
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server transfers the files to disk, than uses a web control panel to
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mark the batch as ready, which marks the result records as ready.
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