main() — netty Function Reference

Source Code

codec-http2/src/test/java/io/netty/handler/codec/http2/HashCollisionTest.java lines 44–79

    public static void main(String[] args) throws IllegalAccessException, IOException, URISyntaxException {
        // Big initial size for when all name sources are pulled in.
        List<CharSequence> strings = new ArrayList<CharSequence>(350000);
        addHttpHeaderNames(strings);
        addHttpHeaderValues(strings);
        addHttp2HeaderNames(strings);
        addWordsFromFile(new File("/usr/share/dict/words"), strings);
        // More "english words" can be found here:
        // https://gist.github.com/Scottmitch/de2f03912778016ecee3c140478f07e0#file-englishwords-txt

        Map<Integer, List<CharSequence>> dups = calculateDuplicates(strings, new Function<CharSequence, Integer>() {
            @Override
            public Integer apply(CharSequence string) {
                int h = 0;
                for (int i = 0; i < string.length(); ++i) {
                    // masking with 0x1F reduces the number of overall bits that impact the hash code but makes the hash
                    // code the same regardless of character case (upper case or lower case hash is the same).
                    h = h * 31 + (string.charAt(i) & 0x1F);
                }
                return h;
            }
        });
        PrintStream writer = System.out;
        writer.println("==Old Duplicates==");
        printResults(writer, dups);

        dups = calculateDuplicates(strings, new Function<CharSequence, Integer>() {
            @Override
            public Integer apply(CharSequence string) {
                return PlatformDependent.hashCodeAscii(string);
            }
        });
        writer.println();
        writer.println("==New Duplicates==");
        printResults(writer, dups);
    }