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| <h2 title="Class DemoImpl" class="title">Class DemoImpl</h2> |
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| <pre>public class <span class="typeNameLabel">DemoImpl</span> |
| extends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">A simple demo that compares brute force counting of uniques vs. using sketches. |
| |
| <p>This demo computes a stream of values and feeds them first to |
| an exact sort-based method of computing the number of unique values |
| in the stream and then feeds a similar stream to two different types of |
| sketches from the library. |
| |
| <p>This demo becomes most significant in the case where the number of uniques in the |
| stream exceeds what the computer can hold in memory. |
| |
| <p>This demo utilizes the Unix sort and wc commands for the brute force compuation. |
| So this needs to be run on a linux or mac machine. A windows machine with a similar unix |
| library installed should also work, but it has not been tested.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/demo/DemoImpl.html#DemoImpl-long-double-">DemoImpl</a></span>(long streamLen, |
| double uniquesFraction)</code> |
| <div class="block">Constuct the demo.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/demo/DemoImpl.html#runDemo--">runDemo</a></span>()</code> |
| <div class="block">Run the demo</div> |
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| <h4>DemoImpl</h4> |
| <pre>public DemoImpl(long streamLen, |
| double uniquesFraction)</pre> |
| <div class="block">Constuct the demo.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>streamLen</code> - The total stream length. Must be > 1000. Will be rounded up to nearest |
| 1000.</dd> |
| <dd><code>uniquesFraction</code> - the fraction of streamLen values less than 1.0, that will be unique. |
| The actual # of uniques will vary around this value, because it is computed statistically.</dd> |
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| <div class="block">Run the demo</div> |
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