Home | History | Annotate | Download | only in examples 
      1 /*
      2  * Copyright (C) 2010 Google Inc.
      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 examples;
     18 
     19 import com.google.caliper.Benchmark;
     20 import com.google.caliper.Param;
     21 import com.google.caliper.model.ArbitraryMeasurement;
     22 
     23 import java.io.ByteArrayOutputStream;
     24 import java.io.IOException;
     25 import java.util.HashMap;
     26 import java.util.Map;
     27 import java.util.zip.Deflater;
     28 
     29 /**
     30  * Example "arbitrary measurement" benchmark.
     31  */
     32 public class CompressionSizeBenchmark {
     33 
     34   @Param({
     35       "this string will compress badly",
     36       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
     37       "asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf"})
     38   private String toCompress;
     39   @Param({"bestCompression", "bestSpeed", "noCompression", "huffmanOnly"})
     40   private String compressionLevel;
     41 
     42   private double compressionRatio;
     43 
     44   public static final Map<String, Integer> compressionLevelMap = new HashMap<String, Integer>();
     45   static {
     46       compressionLevelMap.put("bestCompression", Deflater.BEST_COMPRESSION);
     47       compressionLevelMap.put("bestSpeed", Deflater.BEST_SPEED);
     48       compressionLevelMap.put("noCompression", Deflater.NO_COMPRESSION);
     49       compressionLevelMap.put("huffmanOnly", Deflater.HUFFMAN_ONLY);
     50   }
     51 
     52   @Benchmark long simpleCompression(int reps) {
     53     long dummy = 0;
     54     for (int i = 0; i < reps; i++) {
     55       dummy += compress(toCompress.getBytes()).length;
     56     }
     57     return dummy;
     58   }
     59 
     60   @ArbitraryMeasurement(units = ":1", description = "ratio of uncompressed to compressed")
     61   public double compressionSize() {
     62     byte[] initialBytes = toCompress.getBytes();
     63     byte[] finalBytes = compress(initialBytes);
     64     compressionRatio = (double) initialBytes.length / (double) finalBytes.length;
     65     return compressionRatio;
     66   }
     67 
     68   private byte[] compress(byte[] bytes) {
     69     Deflater compressor = new Deflater();
     70     compressor.setLevel(compressionLevelMap.get(compressionLevel));
     71     compressor.setInput(bytes);
     72     compressor.finish();
     73     ByteArrayOutputStream bos = new ByteArrayOutputStream();
     74     byte[] buf = new byte[1024];
     75     while (!compressor.finished()) {
     76       int count = compressor.deflate(buf);
     77       bos.write(buf, 0, count);
     78     }
     79     try {
     80       bos.close();
     81     } catch (IOException e) {
     82     }
     83     return bos.toByteArray();
     84   }
     85 }
     86