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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.buf;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.StandardCharsets;
import org.junit.Assert;
import org.junit.Assume;
import org.junit.Test;
import org.apache.tomcat.util.compat.JreCompat;
public class TestMessageBytesPerformance {
private static final String CONVERSION_STRING =
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF" +
"0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF";
private static final int CONVERSION_LOOPS = 1000000;
/*
* Checks the the optimized code is faster than the non-optimized code.
*/
@Test
public void testConversionPerformance() {
// ISO_8859_1 conversion appears to be optimised in Java 16 onwards
Assume.assumeFalse(JreCompat.isJre16Available());
long optimized = -1;
long nonOptimized = -1;
/*
* One loop is likely to be enough as the optimised code is
* significantly (3x to 4x on markt's desktop) faster than the
* non-optimised code. Loop three times allows once to warn up the JVM
* once to run the test and once more in case of unexpected CI /GC
* slowness. The test will exit early if possible.
*
* MessageBytes only optimises conversion for ISO_8859_1
*/
for (int i = 0; i < 3; i++) {
optimized = doTestOptimisedConversionPerformance();
nonOptimized = doTestConversionPerformance();
System.out.println(" Optimized: " + optimized + "\nNon-optimized: " + nonOptimized);
if (optimized * 2 < nonOptimized) {
break;
}
}
Assert.assertTrue("Non-optimised code was faster (" + nonOptimized + "ns) compared to optimized (" +
optimized + "ns)", optimized < nonOptimized);
}
private long doTestOptimisedConversionPerformance() {
MessageBytes mb = MessageBytes.newInstance();
long start = System.nanoTime();
for (int i = 0; i < CONVERSION_LOOPS; i++) {
mb.recycle();
mb.setCharset(StandardCharsets.ISO_8859_1);
mb.setString(CONVERSION_STRING);
mb.toBytes();
}
return System.nanoTime() - start;
}
private long doTestConversionPerformance() {
long start = System.nanoTime();
for (int i = 0; i < CONVERSION_LOOPS; i++) {
CharsetEncoder encoder = StandardCharsets.ISO_8859_1.newEncoder().onMalformedInput(
CodingErrorAction.REPORT).onUnmappableCharacter(CodingErrorAction.REPORT);
try {
encoder.encode(CharBuffer.wrap(CONVERSION_STRING));
} catch (CharacterCodingException cce) {
Assert.fail();
}
}
return System.nanoTime() - start;
}
}
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