/*
* ModeShape (http://www.modeshape.org)
*
* Licensed 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.modeshape.common.util;
import static org.junit.Assert.assertEquals;
import org.junit.Before;
import org.junit.Test;
/**
* @author Randall Hauch (rhauch@redhat.com)
*/
public class TimeBasedKeysTest {
protected TimeBasedKeys counter = TimeBasedKeys.create();
private boolean print;
@Before
public void beforeEach() {
this.print = false;
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor1BitCounter() {
TimeBasedKeys counter = TimeBasedKeys.create(1);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(1L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor2Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(2);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(3L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor3Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(3);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(7L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor4Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(4);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(15L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor5Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(5);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(31L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor6Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(6);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(63L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor7Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(7);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(127L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor8Bit() {
TimeBasedKeys counter = TimeBasedKeys.create(8);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(255L, counter.getCounterEndingAt(0L));
}
@Test
public void shouldCorrectlyCalculateFirstAndLastCounterFor16Bit() {
long maxValue = ((long)Math.pow(2, 16)) - 1;
TimeBasedKeys counter = TimeBasedKeys.create(16);
assertEquals(0L, counter.getCounterStartingAt(0L));
assertEquals(maxValue, counter.getCounterEndingAt(0L));
}
@Test
public void shouldObtain10MillionCountersThreadSafe() {
print(counter.nextKey());
for (int i = 0; i != 10000000; ++i) {
counter.nextKey();
}
print(counter.nextKey());
}
@Test
public void shouldObtain10MillionCountersFromThreadSafeUsingMultipleThreads() {
print(counter.nextKey());
for (int j = 0; j != 100; ++j) {
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i != 100000; ++i) {
counter.nextKey();
}
}
}).run();
}
print(counter.nextKey());
}
protected void print( String str ) {
if (print) System.out.println(str);
}
protected void print( long value ) {
if (print) System.out.println(value);
}
}