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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.concurrent;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* @author Simon Thoresen Hult
*/
public class EventBarrierTestCase {
@Test
public void testEmpty() {
// waiting for an empty set of events
Barrier b = new Barrier();
EventBarrier eb = new EventBarrier();
assertTrue(!eb.startBarrier(b));
assertTrue(!b.done);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
int token = eb.startEvent();
eb.completeEvent(token);
assertTrue(!eb.startBarrier(b));
assertTrue(!b.done);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
}
@Test
public void testSimple() {
// a single barrier waiting for a single event
Barrier b = new Barrier();
EventBarrier eb = new EventBarrier();
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
int token = eb.startEvent();
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 0);
assertTrue(eb.startBarrier(b));
assertTrue(!b.done);
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 1);
eb.completeEvent(token);
assertTrue(b.done);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
}
@Test
public void testBarrierChain() {
// more than one barrier waiting for the same set of events
Barrier b1 = new Barrier();
Barrier b2 = new Barrier();
Barrier b3 = new Barrier();
EventBarrier eb = new EventBarrier();
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
int token = eb.startEvent();
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 0);
assertTrue(eb.startBarrier(b1));
assertTrue(eb.startBarrier(b2));
assertTrue(eb.startBarrier(b3));
assertTrue(!b1.done);
assertTrue(!b2.done);
assertTrue(!b3.done);
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 3);
eb.completeEvent(token);
assertTrue(b1.done);
assertTrue(b2.done);
assertTrue(b3.done);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
}
@Test
public void testEventAfter() {
// new events starting after the start of a barrier
Barrier b = new Barrier();
EventBarrier eb = new EventBarrier();
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
int token = eb.startEvent();
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 0);
assertTrue(eb.startBarrier(b));
assertTrue(!b.done);
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 1);
int t2 = eb.startEvent();
assertTrue(!b.done);
assertEquals(eb.getNumEvents(), 2);
assertEquals(eb.getNumBarriers(), 1);
eb.completeEvent(token);
assertTrue(b.done);
assertEquals(eb.getNumEvents(), 1);
assertEquals(eb.getNumBarriers(), 0);
eb.completeEvent(t2);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
}
@Test
public void testReorder() {
// events completing in a different order than they started
Barrier b1 = new Barrier();
Barrier b2 = new Barrier();
Barrier b3 = new Barrier();
EventBarrier eb = new EventBarrier();
int t1 = eb.startEvent();
eb.startBarrier(b1);
int t2 = eb.startEvent();
eb.startBarrier(b2);
int t3 = eb.startEvent();
eb.startBarrier(b3);
int t4 = eb.startEvent();
assertEquals(eb.getNumEvents(), 4);
assertEquals(eb.getNumBarriers(), 3);
assertTrue(!b1.done);
assertTrue(!b2.done);
assertTrue(!b3.done);
eb.completeEvent(t4);
assertTrue(!b1.done);
assertTrue(!b2.done);
assertTrue(!b3.done);
eb.completeEvent(t3);
assertTrue(!b1.done);
assertTrue(!b2.done);
assertTrue(!b3.done);
eb.completeEvent(t1);
assertTrue(b1.done);
assertTrue(!b2.done);
assertTrue(!b3.done);
eb.completeEvent(t2);
assertTrue(b1.done);
assertTrue(b2.done);
assertTrue(b3.done);
assertEquals(eb.getNumEvents(), 0);
assertEquals(eb.getNumBarriers(), 0);
}
private static class Barrier implements EventBarrier.BarrierWaiter {
boolean done = false;
@Override
public void completeBarrier() {
done = true;
}
}
}
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