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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.core;
import org.junit.Test;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import static com.yahoo.jdisc.core.ScheduledQueue.MILLIS_PER_SLOT;
import static com.yahoo.jdisc.core.ScheduledQueue.NUM_SLOTS;
import static com.yahoo.jdisc.core.ScheduledQueue.NUM_SLOTS_UNDILATED;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* @author Simon Thoresen Hult
*/
public class ScheduledQueueTestCase {
@Test
public void requireThatSlotMaskPreventsOverflow() {
for (int slot = 0; slot < NUM_SLOTS * 2; ++slot) {
assertTrue((slot & ScheduledQueue.SLOT_MASK) < NUM_SLOTS);
}
}
@Test
public void requireThatIterShiftDiscardsSlotBits() {
for (int slot = 0; slot < NUM_SLOTS * 2; ++slot) {
assertEquals(slot / NUM_SLOTS, slot >> ScheduledQueue.ITER_SHIFT);
}
}
@Test
public void requireThatNewEntryDoesNotAcceptNull() {
ScheduledQueue queue = new ScheduledQueue(0);
try {
queue.newEntry(null);
fail();
} catch (NullPointerException e) {
}
}
@Test
public void requireThatEntriesCanBeScheduled() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = new Object();
ScheduledQueue.Entry entry = queue.newEntry(foo);
entry.scheduleAt(200);
assertDrainTo(queue, 150);
assertDrainTo(queue, 250, foo);
}
@Test
public void requireThatEntriesCanBeRescheduled() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = new Object();
ScheduledQueue.Entry entry = queue.newEntry(foo);
entry.scheduleAt(200);
entry.scheduleAt(100);
assertDrainTo(queue, 150, foo);
assertDrainTo(queue, 250);
}
@Test
public void requireThatEntriesCanBeUnscheduled() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = new Object();
ScheduledQueue.Entry entry = queue.newEntry(foo);
entry.scheduleAt(100);
entry.unschedule();
assertDrainTo(queue, 150);
}
@Test
public void requireThatDrainToOnlyDrainsExpiredEntries() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = scheduleAt(queue, 100);
Object bar = scheduleAt(queue, 300);
Object baz = scheduleAt(queue, 200);
assertDrainTo(queue, 150, foo);
assertDrainTo(queue, 250, baz);
assertDrainTo(queue, 350, bar);
assertDrainTo(queue, 450);
}
@Test
public void requireThatEntriesDoNotExpireMoreThanOnce() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = scheduleAt(queue, NUM_SLOTS * MILLIS_PER_SLOT + 50);
long now = 0;
for (int i = 0; i < NUM_SLOTS; ++i, now += MILLIS_PER_SLOT) {
assertDrainTo(queue, now);
}
assertDrainTo(queue, now += MILLIS_PER_SLOT, foo);
for (int i = 0; i < NUM_SLOTS; ++i, now += MILLIS_PER_SLOT) {
assertDrainTo(queue, now);
}
}
@Test
public void requireThatNegativeScheduleTranslatesToNow() {
ScheduledQueue queue = new ScheduledQueue(0);
Object foo = scheduleAt(queue, -100);
assertDrainTo(queue, 0, foo);
}
@Test
public void requireThatDrainToPerformsTimeDilationWhenOverloaded() {
ScheduledQueue queue = new ScheduledQueue(0);
List<Object> payloads = new LinkedList<>();
for (int i = 1; i <= NUM_SLOTS_UNDILATED + 1; ++i) {
payloads.add(scheduleAt(queue, i * MILLIS_PER_SLOT));
}
Queue<Object> expired = new LinkedList<>();
long currentTimeMillis = payloads.size() * MILLIS_PER_SLOT;
queue.drainTo(currentTimeMillis, expired);
assertEquals(NUM_SLOTS_UNDILATED, expired.size());
expired = new LinkedList<>();
currentTimeMillis += MILLIS_PER_SLOT;
queue.drainTo(currentTimeMillis, expired);
assertEquals(1, expired.size());
}
private static Object scheduleAt(ScheduledQueue queue, long expireAtMillis) {
Object obj = new Object();
queue.newEntry(obj).scheduleAt(expireAtMillis);
return obj;
}
private static void assertDrainTo(ScheduledQueue queue, long currentTimeMillis, Object... expected) {
Queue<Object> expired = new LinkedList<>();
queue.drainTo(currentTimeMillis, expired);
assertEquals(expected.length, expired.size());
assertEquals(Arrays.asList(expected), expired);
}
}
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