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<title>Source (Parallel Java 2 Library Documentation)</title>
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<div class="subTitle">edu.rit.pjmr</div>
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<h2 title="Interface Source" class="title">Interface Source<I,C></h2>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>I</code> - Data type for data record ID.</dd><dd><code>C</code> - Data type for data record contents.</dd></dl>
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<dl>
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<dt>All Superinterfaces:</dt>
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<dt>All Known Implementing Classes:</dt>
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<dd><a href="../../../edu/rit/pjmr/TextDirectorySource.html" title="class in edu.rit.pjmr">TextDirectorySource</a>, <a href="../../../edu/rit/pjmr/TextFileSource.html" title="class in edu.rit.pjmr">TextFileSource</a></dd>
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<pre>public interface <span class="strong">Source<I,C></span>
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extends <a href="../../../edu/rit/io/Streamable.html" title="interface in edu.rit.io">Streamable</a></pre>
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<div class="block">Interface Source specifies the interface for a data source in the Parallel
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Java Map Reduce Framework.
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<P>
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<I>Note:</I> A class that implements interface Source must be streamable.
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<I>Note:</I> A class that implements interface Source must be multiple thread
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safe.</div>
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<h3>Method Summary</h3>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/pjmr/Source.html#close()">close</a></strong>()</code>
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<div class="block">Close this data source.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code><a href="../../../edu/rit/util/Pair.html" title="class in edu.rit.util">Pair</a><<a href="../../../edu/rit/pjmr/Source.html" title="type parameter in Source">I</a>,<a href="../../../edu/rit/pjmr/Source.html" title="type parameter in Source">C</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/pjmr/Source.html#next(int)">next</a></strong>(int id)</code>
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<div class="block">Get the next data record from this data source.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../edu/rit/pjmr/Source.html#open()">open</a></strong>()</code>
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<div class="block">Open this data source.</div>
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<h3>Methods inherited from interface edu.rit.io.<a href="../../../edu/rit/io/Streamable.html" title="interface in edu.rit.io">Streamable</a></h3>
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<code><a href="../../../edu/rit/io/Streamable.html#readIn(edu.rit.io.InStream)">readIn</a>, <a href="../../../edu/rit/io/Streamable.html#writeOut(edu.rit.io.OutStream)">writeOut</a></code></li>
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<h3>Method Detail</h3>
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<h4>open</h4>
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<pre>void open()
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throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
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<div class="block">Open this data source.</div>
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<dl><dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - Thrown if an I/O error occurred.</dd></dl>
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<h4>next</h4>
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<pre><a href="../../../edu/rit/util/Pair.html" title="class in edu.rit.util">Pair</a><<a href="../../../edu/rit/pjmr/Source.html" title="type parameter in Source">I</a>,<a href="../../../edu/rit/pjmr/Source.html" title="type parameter in Source">C</a>> next(int id)
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throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
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<div class="block">Get the next data record from this data source. The data record is being
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requested by the mapper with the given ID. The data record is a
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<a href="../../../edu/rit/util/Pair.html" title="class in edu.rit.util">Pair</a> containing a data record ID and the data record
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contents.
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<P>
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The mapper ID is an integer ≥ 0 that uniquely identifies a particular
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<a href="../../../edu/rit/pjmr/Mapper.html" title="class in edu.rit.pjmr"><code>Mapper</code></a>. The source cannot assume anything about which mapper IDs
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will be passed to the <TT>next()</TT> method. The source is allowed to
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ignore the mapper ID, if it makes no difference.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>id</code> - Mapper ID.</dd>
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<dt><span class="strong">Returns:</span></dt><dd>Data record, or null if there are no more.</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - Thrown if an I/O error occurred.</dd></dl>
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<h4>close</h4>
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<pre>void close()
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throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
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<div class="block">Close this data source.</div>
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<dl><dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - Thrown if an I/O error occurred.</dd></dl>
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<p class="legalCopy"><small><FONT SIZE="-2">Copyright © 2013–2016 by Alan Kaminsky. All rights reserved. Send comments to ark</FONT><FONT SIZE="1" COLOR="#FFFFFF">­</FONT><FONT SIZE="-2">@</FONT><FONT SIZE="1" COLOR="#FFFFFF">­</FONT><FONT SIZE="-2">cs.rit.edu.</FONT></small></p>
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