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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.juli;
import org.junit.Assert;
import org.junit.Test;
/**
* Compares date/time format implementations. The current implementation ({@link
* DateFormatCache} is one to two orders of magnitude faster than
* {@link String#format(String, Object...)}
*/
public class TestOneLineFormatterPerformance {
@Test
public void testDateFormat() throws Exception {
DateFormat stringFormatImpl = new StringFormatImpl();
long stringFormatImplTime = doTestDateFormat(stringFormatImpl);
DateFormat dateFormatCacheImpl = new DateFormatCacheImpl();
long dateFormatCacheImplTime = doTestDateFormat(dateFormatCacheImpl);
Assert.assertTrue("String#format was faster that DateFormatCache",
dateFormatCacheImplTime < stringFormatImplTime);
}
private long doTestDateFormat(DateFormat df) {
int iters = 1000000;
long start = System.nanoTime();
for (int i = 0; i < iters; i++) {
df.format(System.nanoTime());
}
long end = System.nanoTime();
System.out.println(
"Impl: [" + df.getClass().getName() + "] took [" + (end - start) + "] ns");
return end - start;
}
private interface DateFormat {
String format(long timestamp);
}
private static class StringFormatImpl implements DateFormat {
@Override
public String format(long timestamp) {
return String.format("%1$td-%1$tb-%1$tY %1$tH:%1$tM:%1$tS", Long.valueOf(timestamp));
}
}
private static class DateFormatCacheImpl implements DateFormat {
private final DateFormatCache cache;
DateFormatCacheImpl() {
cache = new DateFormatCache(5, "dd-MMM-yyyy HH:mm:ss", null);
}
@Override
public String format(long timestamp) {
return cache.getFormat(timestamp);
}
}
}
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