/*
* 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.http;
import org.junit.Assert;
import org.junit.Test;
public class TestFastHttpDateFormat {
@Test
public void testGetCurrentDate() {
/*
* Run three iterations of the test. The runs are offset by 1300 seconds to ensure that FastHttpDateFormat is
* using a 1s window aligned with the start of a second.
*/
for (int i = 0; i < 3; i++) {
if (i > 0) {
try {
Thread.sleep(1300);
} catch (InterruptedException e) {
Assert.fail("InterruptedException observed");
}
}
String d1 = FastHttpDateFormat.getCurrentDate();
long start = System.currentTimeMillis() / 1000;
long t1 = start;
long t2 = 0;
long t3 = 0;
String d2 = d1;
/*
* Run this test for 3s. Should normally see 3 changes of date. Because d1 and t1 are not set atomically,
* it is possible for them to be inconsistent. That inconsistency can lead to one more or one less change
* than typically expected. Therefore, the test accepts 2, 3 or 4 changes.
*/
int changes = 0;
while (t1 - start < 3) {
// Copy results to next slot, dropping the oldest (t3 and d2)
d2 = d1;
t3 = t2;
t2 = t1;
// Get current results. The date must be obtained before the current time.
d1 = FastHttpDateFormat.getCurrentDate();
t1 = System.currentTimeMillis() / 1000;
// Has the formatted date changed
if (!d2.equals(d1)) {
changes++;
// Then the second must have changed
if (t1 == t2 && t2 == t3) {
Assert.fail("Formatted date changed within the same second");
}
}
}
Assert.assertTrue("Saw [" + changes + "] changes in formatted date", changes > 1 && changes < 5);
}
}
}