/*
* Copyright 2013 Rackspace
*
* 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 com.rackspacecloud.blueflood.rollup;
import com.rackspacecloud.blueflood.exceptions.GranularityException;
import com.rackspacecloud.blueflood.types.Range;
import org.junit.Assert;
import org.junit.Test;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class SlotTest {
@Test
public void testRangeIteratorFullAnd5m() throws Exception {
Set<Range> expectedRanges = new HashSet<Range>();
expectedRanges.add(new Range(0, 299999));
expectedRanges.add(new Range(300000, 599999));
expectedRanges.add(new Range(600000, 899999));
expectedRanges.add(new Range(900000, 1199999));
// FULL and 5m have the same rollup semantics.
for (Granularity g : new Granularity[] { Granularity.FULL, Granularity.MIN_5}) {
Set<Range> actualRanges = new HashSet<Range>();
for (Range time : Range.getRangesToRollup(g, 200000, 1000000)) {
actualRanges.add(time);
verifySingleSlot(time, g);
}
Assert.assertEquals(expectedRanges, actualRanges);
}
}
@Test
public void testRangeIterator20m() throws Exception {
Set<Range> expectedRanges = makeRanges(Granularity.MIN_20, 3600000, 33);
Set<Range> actualRanges = new HashSet<Range>();
int baseMillis = 6500000;
int hrs = 10;
int endMillis = baseMillis + 3600000 * hrs;
for (Range time : Range.getRangesToRollup(Granularity.MIN_20, baseMillis, endMillis)) {
actualRanges.add(time);
verifySingleSlot(time, Granularity.MIN_20);
}
Assert.assertEquals(expectedRanges, actualRanges);
}
@Test
public void testRangeMapper60m() throws Exception {
int baseMillis = 6500000;
int hrs = 10;
int endMillis = baseMillis + 3600000 * hrs;
//Map of every 60m(coarser gran) in this time range, mapped to iterable of 20m sub-ranges that get rolled up
Map<Range, Iterable<Range>> retMap = Range.mapFinerRanges(Granularity.MIN_60, new Range(baseMillis, endMillis));
Assert.assertEquals(retMap.entrySet().size(), 11);
for(Map.Entry<Range,Iterable<Range>> entry : retMap.entrySet()) {
Range coarserSubRange = entry.getKey();
int iterValCount = 0;
Iterable<Range> subranges = entry.getValue();
for (Range subrange : subranges) {
if(iterValCount == 0) {
//Start point of coarser range is equal to start point of 1st 20m sub-range
Assert.assertEquals(coarserSubRange.getStart(), subrange.getStart());
}
iterValCount++;
if(iterValCount == 3) {
Assert.assertEquals(coarserSubRange.getStop() - 1, subrange.getStop());
}
}
//Every 60m range gets divided into 3 20m sub-ranges
Assert.assertEquals(iterValCount, 3);
}
}
@Test
public void testRangeIterator60m() throws Exception {
Set<Range> expectedRanges = makeRanges(Granularity.MIN_60, 1334577600000L, 72);
Set<Range> actualRanges = new HashSet<Range>();
long baseMillis = 1334582854000L; // nearly Mon Apr 16 06:26:52 PDT 2012
int hrs = 70;
long endMillis = baseMillis + 3600000 * hrs;
for (Range time : Range.getRangesToRollup(Granularity.MIN_60, baseMillis, endMillis)) {
actualRanges.add(time);
verifySingleSlot(time, Granularity.MIN_60);
}
Assert.assertEquals(expectedRanges, actualRanges);
}
@Test
public void testRangeIterator240m() throws Exception {
Set<Range> expectedRanges = makeRanges(Granularity.MIN_240, 1334534400000L, 66);
Set<Range> actualRanges = new HashSet<Range>();
long baseMillis = 1334582854000L; // nearly Mon Apr 16 06:26:52 PDT 2012
int hrs = 240; // 10 days.
long endMillis = baseMillis + 3500000 * hrs; // todo: should be 3600000?
for (Range time : Range.getRangesToRollup(Granularity.MIN_240, baseMillis, endMillis)) {
actualRanges.add(time);
verifySingleSlot(time, Granularity.MIN_240);
}
Assert.assertEquals(expectedRanges, actualRanges);
}
// there is no testRangeIterator1440m because range iteration isn't defined for that granularity because there
// is no granularity that is more coarse.
// ensure that every point of time within a given range is in the same slot as the beginning of the range.
private void verifySingleSlot(Range r, Granularity g) {
int init = g.slot(r.start);
for (long time = r.start; time <= r.stop; time += 1000)
Assert.assertEquals(init, g.slot(time));
}
// create a collection of consecutive ranges.
private static Set<Range> makeRanges(Granularity g, long startMillis, int count) {
Set<Range> set = new HashSet<Range>();
long millis = startMillis;
for (int i = 0; i < count; i++) {
long end = millis + g.milliseconds();
set.add(new Range(millis, end - 1));
millis = end;
}
return set;
}
@Test
public void testSlotCalculationsRawAnd5m() {
final long now = 1331650343000L;
final long slot = 3634;
Assert.assertEquals(slot, Granularity.millisToSlot(now));
// 5 mins now should be in the next slot.
Assert.assertEquals(slot + 1, Granularity.millisToSlot(now + Granularity.MILLISECONDS_IN_SLOT));
Assert.assertEquals(slot + 1, Granularity.FULL.slot(now + Granularity.MILLISECONDS_IN_SLOT));
Assert.assertEquals(slot + 1, Granularity.MIN_5.slot(now + Granularity.MILLISECONDS_IN_SLOT));
// should repeat after however many seconds are in NUMBER_OF_SLOTS * MILLISECONDS_PER_SLOT
Assert.assertEquals(slot, Granularity.millisToSlot(now + (Granularity.FULL.numSlots() * Granularity.MILLISECONDS_IN_SLOT)));
Assert.assertEquals(slot, Granularity.FULL.slot(now + (Granularity.FULL.numSlots() * Granularity.MILLISECONDS_IN_SLOT)));
Assert.assertEquals(slot, Granularity.MIN_5.slot(now + (Granularity.FULL.numSlots() * Granularity.MILLISECONDS_IN_SLOT)));
// test the very end of the cycle.
long endOfCycle = now + ((Granularity.FULL.numSlots() - slot - 1) * Granularity.MILLISECONDS_IN_SLOT); // basically the number of secs to get to slot == 4095
Assert.assertEquals(Granularity.FULL.numSlots() - 1, Granularity.millisToSlot(endOfCycle));
Assert.assertEquals(Granularity.FULL.numSlots() - 1, Granularity.FULL.slot(endOfCycle));
Assert.assertEquals(Granularity.MIN_5.numSlots() - 1, Granularity.MIN_5.slot(endOfCycle));
// adding 300s (one slot) should wrap back around to zero.
Assert.assertEquals(0, Granularity.millisToSlot(endOfCycle + Granularity.MILLISECONDS_IN_SLOT));
Assert.assertEquals(0, Granularity.FULL.slot(endOfCycle + Granularity.MILLISECONDS_IN_SLOT));
Assert.assertEquals(0, Granularity.MIN_5.slot(endOfCycle + Granularity.MILLISECONDS_IN_SLOT));
}
@Test
public void testSlotRelationships() {
final long now = 1331650343000L;
final long slot = 3634;
Assert.assertEquals(slot, Granularity.FULL.slot(now));
Assert.assertEquals(slot, Granularity.MIN_5.slot(now));
Assert.assertEquals(Granularity.FULL.numSlots(), Granularity.MIN_5.numSlots());
Assert.assertEquals(Granularity.FULL.numSlots() / 4, Granularity.MIN_20.numSlots());
Assert.assertEquals(Granularity.FULL.numSlots() / 12, Granularity.MIN_60.numSlots());
Assert.assertEquals(Granularity.FULL.numSlots() / 48, Granularity.MIN_240.numSlots());
Assert.assertEquals(Granularity.FULL.numSlots() / 288, Granularity.MIN_1440.numSlots());
// make sure there are no remainders for the minute ratios
Assert.assertTrue(Granularity.FULL.numSlots() % 4 == 0);
Assert.assertTrue(Granularity.FULL.numSlots() % 12 == 0);
Assert.assertTrue(Granularity.FULL.numSlots() % 48 == 0);
Assert.assertTrue(Granularity.FULL.numSlots() % 288 == 0);
}
@Test
public void testStaticSameAsFull() {
final long baseMillis = 1333635148000L; // some point during 5 April 2012.
final long endMillis = baseMillis + (1000 * 60 * 60 * 48); // +48hrs
Assert.assertEquals(Granularity.millisToSlot(baseMillis), Granularity.FULL.slot(baseMillis));
Assert.assertEquals(Granularity.millisToSlot(endMillis), Granularity.FULL.slot(endMillis));
}
@Test
// make sure the same kind of tests still pass at coarser granularities.
public void testCoarseSlotCalculations() {
final long now = 1334582854000L;
Granularity[] granularities = new Granularity[] {Granularity.MIN_20, Granularity.MIN_60, Granularity.MIN_240, Granularity.MIN_1440};
int[] initialSlots = new int[] {328, 109, 27, 4};
for (int i = 0; i < initialSlots.length; i++) {
final long slot = initialSlots[i];
final Granularity gran = granularities[i];
Assert.assertEquals(slot, gran.slot(now));
// next slot should increment by 1.
Assert.assertEquals(slot + 1, gran.slot(now + gran.milliseconds()));
// should repeat.
Assert.assertEquals(slot, gran.slot(now + gran.milliseconds() * gran.numSlots()));
// very end of cycle.
long endOfCycle = now + (gran.numSlots() - slot - 1) * gran.milliseconds();
Assert.assertEquals(gran.numSlots() - 1, gran.slot(endOfCycle));
// adding seconds() should wrap back to zero.
Assert.assertEquals(0, gran.slot(endOfCycle + gran.milliseconds()));
}
}
@Test(expected=GranularityException.class)
public void testSlotFromFinerSlotThrowsAtFull() throws Throwable {
try {
Granularity.FULL.slotFromFinerSlot(123);
} catch (RuntimeException e) {
throw e.getCause();
}
}
@Test
public void testSlotFromFinerSlot() {
// i.e, slot 144 for a 5m is == slot 36 of 20m ( 144 / (20/5)), slot 12 at 60m, slot 3 at 240m, etc
try {
Assert.assertEquals(256, Granularity.MIN_5.slotFromFinerSlot(256));
Assert.assertEquals(35, Granularity.MIN_20.slotFromFinerSlot(143));
Assert.assertEquals(36, Granularity.MIN_20.slotFromFinerSlot(144));
Assert.assertEquals(36, Granularity.MIN_20.slotFromFinerSlot(145));
Assert.assertEquals(36, Granularity.MIN_20.slotFromFinerSlot(146));
Assert.assertEquals(36, Granularity.MIN_20.slotFromFinerSlot(147));
Assert.assertEquals(37, Granularity.MIN_20.slotFromFinerSlot(148));
Assert.assertEquals(12, Granularity.MIN_60.slotFromFinerSlot(36));
Assert.assertEquals(3, Granularity.MIN_240.slotFromFinerSlot(12));
Assert.assertEquals(2, Granularity.MIN_1440.slotFromFinerSlot(13));
} catch (GranularityException e) {
Assert.assertNull("GranularityException seen on non-full-res Granularity", e);
}
}
@Test
public void testRangeDerivation() {
for (Granularity gran : Granularity.granularities()) {
long now = 1334582854000L;
int nowSlot = gran.slot(now);
now = gran.snapMillis(now);
Range nowRange = new Range(now, now + gran.milliseconds() - 1);
Assert.assertEquals(nowRange, gran.deriveRange(nowSlot, now));
Range prevRange = gran.deriveRange(nowSlot - 1, now);
Assert.assertEquals(gran.milliseconds(), nowRange.start - prevRange.start);
// incrementing nowSlot forces us to test slot wrapping.
Range wayBeforeRange = gran.deriveRange(nowSlot + 1, now);
Assert.assertEquals(gran.numSlots() - 1, (nowRange.start - wayBeforeRange.start) / gran.milliseconds());
}
}
}