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package other_examples;
import com.google.common.base.Charsets;
import com.google.common.io.CharStreams;
import org.apache.commons.io.IOUtils;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
/**
* Created by vvedenin on 2/15/2016.
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Warmup(iterations = 2, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class ConvertInputStreamToStringBenchmark {
private final static String test1 = "test1847686128764812764876128ΠΏΠ²Π²ΠΏΠ²76417826487216478216784621784672816478216784621784621786478216478216784261784621"+ "\n\r" +"782178647281647821647821697421687126784621874621786478216478216874";
private final static InputStream inputStream = IOUtils.toInputStream(test1, StandardCharsets.UTF_8);
/* 1. Using IOUtils.toString (Apache Utils) */
@Benchmark
public String test1_apacheToInputStream() throws IOException {
mark();
String result = IOUtils.toString(inputStream, StandardCharsets.UTF_8);
reset();
return result;
}
/* 2. Using CharStreams (guava) */
@Benchmark
public String test2_guavaCharStreams() throws IOException {
mark();
String result = CharStreams.toString(new InputStreamReader(inputStream, Charsets.UTF_8));
inputStream.reset();
return result;
}
/* 3. Using Scanner (JDK) */
@Benchmark
public String test3_jdkScanner() throws IOException {
mark();
Scanner s = new Scanner(inputStream).useDelimiter("\\A");
String result = s.hasNext() ? s.next() : "";
reset();
return result;
}
/* 4. Using Stream Api (Java 8) */
@Benchmark
public String test4_jdkJava8() throws IOException {
mark();
String result = new BufferedReader(new InputStreamReader(inputStream)).lines().collect(Collectors.joining("\n"));
reset();
return result;
}
/* 5. Using parallel Stream Api (Java 8) */
@Benchmark
public String test5_jdkJava8parallel() throws IOException {
mark();
String result = new BufferedReader(new InputStreamReader(inputStream)).lines().parallel().collect(Collectors.joining("\n"));
reset();
return result;
}
/* 6. Using InputStreamReader and StringBuilder (JDK) */
@Benchmark
public String test6_inputStreamReaderAndStringBuilder() throws IOException {
mark();
final int bufferSize = 1024;
final char[] buffer = new char[bufferSize];
final StringBuilder out = new StringBuilder();
Reader in = new InputStreamReader(inputStream, "UTF-8");
for (; ; ) {
int rsz = in.read(buffer, 0, buffer.length);
if (rsz < 0)
break;
out.append(buffer, 0, rsz);
}
reset();
return out.toString();
}
/* 7. Using StringWriter and IOUtils.copy (Apache Commons)*/
@Benchmark
public String test7_apacheStringWriterAndIOUtilsCopy() throws IOException {
mark();
StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, "UTF-8");
reset();
return writer.toString();
}
/* 8. Using ByteArrayOutputStream and inputStream.read (JDK) */
@Benchmark
public String test8_readByteArrayOutputStream() throws IOException {
mark();
ByteArrayOutputStream result = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
result.write(buffer, 0, length);
}
reset();
return result.toString("UTF-8");
}
/* 9. Using BufferedReader (JDK) */
@Benchmark
public String test9_bufferedReaderReadLine() throws IOException {
mark();
String newLine = System.getProperty("line.separator");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder result = new StringBuilder();
String line; boolean flag = false;
while ((line = reader.readLine()) != null) {
result.append(flag? newLine: "").append(line);
flag = true;
}
reset();
return result.toString();
}
/* 10. Using BufferedInputStream and ByteArrayOutputStream (JDK) */
@Benchmark
public String test10_bufferedInputStreamAndByteArrayOutputStream() throws IOException {
mark();
BufferedInputStream bis = new BufferedInputStream(inputStream);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result = bis.read();
while(result != -1) {
buf.write((byte) result);
result = bis.read();
}
reset();
return buf.toString();
}
/* 11. Using inputStream.read() and StringBuilder (JDK) */
@Benchmark
public String test11_inputStreamReadAndStringBuilder() throws IOException {
mark();
int ch;
StringBuilder sb = new StringBuilder();
while((ch = inputStream.read()) != -1)
sb.append((char)ch);
reset();
return sb.toString();
}
/* 12. Using BufferedReader (JDK) */
@Benchmark
public String test12_bufferedReaderReadLine2() throws IOException {
mark();
String newLine = System.getProperty("line.separator");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(newLine).append(line);
}
reset();
return result.toString().trim();
}
private void reset() throws IOException {
inputStream.reset();
}
private void mark() {
inputStream.mark(0);
}
public static void main(String[] args) throws Exception {
ConvertInputStreamToStringBenchmark test = new ConvertInputStreamToStringBenchmark();
System.out.println();
System.out.println("1. apacheToInputStream : " + test.test1_apacheToInputStream().length());
System.out.println("2. guavaCharStreams : " + test.test2_guavaCharStreams().length());
System.out.println("3. jdkScanner : " + test.test3_jdkScanner().length());
System.out.println("4. jdkJava8 : " + test.test4_jdkJava8().length());
System.out.println("5. jdkJava8parallel : " + test.test5_jdkJava8parallel().length());
System.out.println("6. inputStreamReaderAndStringBuilder : " + test.test6_inputStreamReaderAndStringBuilder().length());
System.out.println("7. apacheStringWriterAndIOUtilsCopy : " + test.test7_apacheStringWriterAndIOUtilsCopy().length());
System.out.println("8. readByteArrayOutputStream : " + test.test8_readByteArrayOutputStream().length());
System.out.println("9. bufferedReaderReadLine : " + test.test9_bufferedReaderReadLine().length());
System.out.println("10. bufferedInputStreamAndByteArrayOutputStream : " + test.test10_bufferedInputStreamAndByteArrayOutputStream().length());
System.out.println("11. inputStreamReadAndStringBuilder : " + test.test11_inputStreamReadAndStringBuilder().length());
System.out.println("12. test12_bufferedReaderReadLine2 : " + test.test12_bufferedReaderReadLine2().length());
System.out.println();
Options opt = new OptionsBuilder()
.include(ConvertInputStreamToStringBenchmark.class.getSimpleName())
.build();
new Runner(opt).run();
}
}