[GitHub] amarkevich opened a new pull request #483: HttpHeaderHelper: String.replace instead of Pattern.matcher().replaceAll

[GitBox <gi...@apache.org>]

amarkevich opened a new pull request #483: HttpHeaderHelper: String.replace instead of Pattern.matcher().replaceAll
URL: https://github.com/apache/cxf/pull/483
 
 
   benchmark [1] results:
   - old: 40 MB 47 ms
   - new: 9 MB 0 ms
   1.
   ```
   public class HttpHeaderHelperMapCharsetTest {
       private static final int CNT = 131072;
       static final String charset = java.nio.charset.StandardCharsets.UTF_8.name();
       private static final String[] STR = new String[CNT];
       static {
           for (int i = 0; i < CNT; ++i) {
               if (i % 3 == 0) {
                   STR[i] = "\"" + charset + "\"";
               } else if (i % 3 == 1) {
                   STR[i] = "'" + charset + "'";
               } else {
                   STR[i] = charset;
               }
           }
       }
   
       @org.junit.Test
       public void mapCharset() {
           metrics("HttpHeaderHelper::mapCharset", HttpHeaderHelper::mapCharset);
       }
   
       @org.junit.Test
       public void mapCharset2() {
           metrics("HttpHeaderHelper::mapCharset2", HttpHeaderHelper::mapCharset2);
       }
   
       private static void metrics(String label, java.util.function.Function<String, String> f) {
           Runtime.getRuntime().gc();
           long m = Runtime.getRuntime().freeMemory();
           long t = System.currentTimeMillis();
           for (int i = 0; i < CNT; ++i) {
               org.junit.Assert.assertEquals(charset, f.apply(STR[i]));
           }
           System.out.println(label + ": " + ((m - Runtime.getRuntime().freeMemory()) / (1024 * 1024)) + " MB "
                   + (System.currentTimeMillis() - t) + " ms");
       }
   
       public static void main(String[] args) {
           final HttpHeaderHelperMapCharsetTest splitTest = new HttpHeaderHelperMapCharsetTest();
           for (int i = 0; i < 10; ++i) {
               System.out.println("Round #" + i);
               splitTest.mapCharset();
               splitTest.mapCharset2();
           }
       }
   
   }
   ```

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