1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.openjdk.bench.java.util.regex;
  24 
  25 import org.openjdk.jmh.annotations.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Measurement;
  28 import org.openjdk.jmh.annotations.Mode;
  29 import org.openjdk.jmh.annotations.OutputTimeUnit;
  30 import org.openjdk.jmh.annotations.Param;
  31 import org.openjdk.jmh.annotations.Scope;
  32 import org.openjdk.jmh.annotations.Setup;
  33 import org.openjdk.jmh.annotations.State;
  34 import org.openjdk.jmh.annotations.Warmup;
  35 
  36 import java.util.concurrent.TimeUnit;
  37 import java.util.regex.Pattern;
  38 import java.util.regex.PatternSyntaxException;
  39 
  40 @BenchmarkMode(Mode.AverageTime)
  41 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  42 @State(Scope.Thread)
  43 public class PatternBench {
  44 
  45     public String fileTestString;
  46     public String flagsString;
  47 
  48 
  49     public Pattern graphemePattern;
  50     public Pattern jmodPattern;
  51     public Pattern jmodCanonicalPattern;
  52 
  53     public Pattern pattern;
  54 
  55     @Setup
  56     public void setup() {
  57         flagsString = "\ud83c\udde6\ud83c\uddec\ud83c\uddec\ud83c\udde6\ud83c\uddfa\ud83c\uddf8\ud83c\uddeb\ud83c\uddf7";
  58         fileTestString = "META-INF/providers/org.openjdk.foo_hotspot_nodes_PluginFactory_EndLockScopeNode";
  59         graphemePattern = Pattern.compile("\\b{g}");
  60         jmodCanonicalPattern = Pattern.compile("^.*(?:(?:_the\\.[^/]*)|(?:_[^/]*\\.marker)|(?:[^/]*\\.diz)|(?:[^/]*\\.debuginfo)|(?:[^/]*\\.dSYM/.*)|(?:[^/]*\\.dSYM)|(?:[^/]*\\.pdb)|(?:[^/]*\\.map))$", Pattern.CANON_EQ);
  61         jmodPattern = Pattern.compile("^.*(?:(?:_the\\.[^/]*)|(?:_[^/]*\\.marker)|(?:[^/]*\\.diz)|(?:[^/]*\\.debuginfo)|(?:[^/]*\\.dSYM/.*)|(?:[^/]*\\.dSYM)|(?:[^/]*\\.pdb)|(?:[^/]*\\.map))$");
  62     }
  63 
  64     @Benchmark
  65     @Warmup(iterations = 3)
  66     @Measurement(iterations = 3)
  67     public int splitFlags() {
  68         return graphemePattern.split(flagsString).length;
  69     }
  70 
  71     @Benchmark
  72     @Warmup(iterations = 3)
  73     @Measurement(iterations = 3)
  74     public boolean canonicalJmodMatch() {
  75         return jmodCanonicalPattern.matcher(fileTestString).matches();
  76     }
  77 
  78     @Benchmark
  79     @Warmup(iterations = 3)
  80     @Measurement(iterations = 3)
  81     public boolean normalJmodMatch() {
  82         return jmodPattern.matcher(fileTestString).matches();
  83     }
  84 }