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POGuava Charmatcher static initialization slow
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copied!<p>UPDATE: It looks like my 13.0.1 is calling code from this diffed CharMatcher.</p> <p><a href="http://code.google.com/p/guava-libraries/source/diff?spec=svn69ad96b719d7cd3d872a948d7454f17b816a21c2&r=464b0cfab7c3b6713c35e6f3ae7426542668c77b&format=side&path=/guava/src/com/google/common/base/CharMatcher.java" rel="noreferrer">http://code.google.com/p/guava-libraries/source/diff?spec=svn69ad96b719d7cd3d872a948d7454f17b816a21c2&r=464b0cfab7c3b6713c35e6f3ae7426542668c77b&format=side&path=/guava/src/com/google/common/base/CharMatcher.java</a></p> <p>I seem to be having an issue with Guava's Charmatcher. I am currently writing some JUnit tests and I am noticing the first test takes a bit of time (15+ seconds), but the future tests are all approximately the same (.3 seconds), with a majority of the tests running through the same code. </p> <p>My analysis of the code has pinpointed that the Charmatcher in Guava's library seems to be the culprit. It looks like there is a bit of static initialization code in CharMatcher that might be the true reason it is taking so long. Is there any way I can disable or optimize this behavior? Is there something I am missing from the wiki pages or help files?</p> <p>Guava version 13.0.1, System: Linux 64, Eclipse 3.6.1</p> <p>EDIT: I built a test app with the following code:</p> <pre><code>import com.google.common.base.CharMatcher; public class Main { public static void main(String[] args) { // Using system instead of stopwatch to isolate library. long startTime = System.currentTimeMillis(); CharMatcher.is(' '); long endTime = System.currentTimeMillis(); System.out.println("took " + String.valueOf(endTime-startTime) + " ms"); startTime = System.currentTimeMillis(); CharMatcher.is('d'); endTime = System.currentTimeMillis(); System.out.println("2nd took " + String.valueOf(endTime-startTime) + " ms"); } } </code></pre> <p>This resulted in the following output:</p> <pre><code>took 15945 ms 2nd took 0 ms </code></pre> <p>I ran this in eclipse minus the JUnit framework and just google's guava library. Also I packaged an executable char and received similar results. I'll come back with a second edit after I run a profiler through it.</p> <p>Thanks for any help.</p> <p>Edit 2: Results from profiling:</p> <pre><code>Main.main(String[]) 22,556 ms com.google.common.base.CharMatcher.<clinit>() 22.556 ms com.google.common.base.CharMatcher.precomputed() 22,550 ms com.google.common.base.Platform.precomputeCharMatcher(CharMatcher) 22,550 ms com.google.common.base.CharMatcher.precomputedInternal() 22,550 ms com.google.common.base.CharMatcher.slowGetChars() 13,638 ms com.google.common.base.CharMatcher.setBits(CharMatcher$LookupTable) 8,911 ms </code></pre>

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