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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package benchmarks.regression;
     18 
     19 import com.google.caliper.Param;
     20 
     21 public class StringReplaceAllBenchmark {
     22     // NOTE: These estimates of MOVEABLE / NON_MOVEABLE are based on a knowledge of
     23     // ART implementation details. They make a difference here because JNI calls related
     24     // to strings took different paths depending on whether the String in question was
     25     // moveable or not.
     26     enum StringLengths {
     27         EMPTY(""),
     28         MOVEABLE_16(makeString(16)),
     29         MOVEABLE_256(makeString(256)),
     30         MOVEABLE_1024(makeString(1024)),
     31         NON_MOVEABLE(makeString(64 * 1024)),
     32         BOOT_IMAGE(java.util.jar.JarFile.MANIFEST_NAME);
     33 
     34         private final String value;
     35 
     36         StringLengths(String s) {
     37             this.value = s;
     38         }
     39     }
     40 
     41     private static final String makeString(int length) {
     42         final String sequence8 = "abcdefghijklmnop";
     43         final int numAppends = (length / 16) - 1;
     44         StringBuilder stringBuilder = new StringBuilder(length);
     45 
     46         // (n-1) occurences of "abcdefghijklmnop"
     47         for (int i = 0; i < numAppends; ++i) {
     48             stringBuilder.append(sequence8);
     49         }
     50 
     51         // and one final occurence of qrstuvwx.
     52         stringBuilder.append("qrstuvwx");
     53 
     54         return stringBuilder.toString();
     55     }
     56 
     57     @Param private StringLengths s;
     58 
     59     public void timeReplaceAllTrivialPatternNonExistent(int reps) {
     60         for (int i = 0; i < reps; ++i) {
     61             s.value.replaceAll("fish", "0");
     62         }
     63     }
     64 
     65     public void timeReplaceTrivialPatternAllRepeated(int reps) {
     66         for (int i = 0; i < reps; ++i) {
     67             s.value.replaceAll("jklm", "0");
     68         }
     69     }
     70 
     71     public void timeReplaceAllTrivialPatternSingleOccurence(int reps) {
     72         for (int i = 0; i < reps; ++i) {
     73             s.value.replaceAll("qrst", "0");
     74         }
     75     }
     76 }
     77