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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.handler;
import org.junit.jupiter.api.Test;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
/**
* @author Simon Thoresen Hult
*/
public class FutureConjunctionTestCase {
private final ExecutorService executor = Executors.newCachedThreadPool();
@Test
void requireThatAllFuturesAreWaitedFor() throws Exception {
final CountDownLatch latch = new CountDownLatch(1);
FutureConjunction future = new FutureConjunction();
CompletableFuture<Boolean> cf = new CompletableFuture<>();
cf.completeAsync(() -> {
try {
return latch.await(600, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
return false;
}
}, executor);
future.addOperand(cf);
try {
future.get(100, TimeUnit.MILLISECONDS);
fail();
} catch (TimeoutException e) {
}
latch.countDown();
assertTrue(future.get(600, TimeUnit.SECONDS));
}
@Test
void requireThatGetReturnValueIsAConjunction() throws Exception {
assertTrue(tryGet(true));
assertTrue(tryGet(true, true));
assertTrue(tryGet(true, true, true));
assertFalse(tryGet(false));
assertFalse(tryGet(false, true));
assertFalse(tryGet(true, false));
assertFalse(tryGet(false, true, true));
assertFalse(tryGet(true, false, true));
assertFalse(tryGet(true, true, false));
assertFalse(tryGet(false, false, true));
assertFalse(tryGet(false, true, false));
assertFalse(tryGet(true, false, false));
}
@Test
void requireThatIsDoneReturnValueIsAConjunction() {
assertTrue(tryIsDone(true));
assertTrue(tryIsDone(true, true));
assertTrue(tryIsDone(true, true, true));
assertFalse(tryIsDone(false));
assertFalse(tryIsDone(false, true));
assertFalse(tryIsDone(true, false));
assertFalse(tryIsDone(false, true, true));
assertFalse(tryIsDone(true, false, true));
assertFalse(tryIsDone(true, true, false));
assertFalse(tryIsDone(false, false, true));
assertFalse(tryIsDone(false, true, false));
assertFalse(tryIsDone(true, false, false));
}
@Test
void requireThatCancelReturnValueIsAConjuction() {
assertTrue(tryCancel(true));
assertTrue(tryCancel(true, true));
assertTrue(tryCancel(true, true, true));
assertFalse(tryCancel(false));
assertFalse(tryCancel(false, true));
assertFalse(tryCancel(true, false));
assertFalse(tryCancel(false, true, true));
assertFalse(tryCancel(true, false, true));
assertFalse(tryCancel(true, true, false));
assertFalse(tryCancel(false, false, true));
assertFalse(tryCancel(false, true, false));
assertFalse(tryCancel(true, false, false));
}
@Test
void requireThatIsCancelledReturnValueIsAConjuction() {
assertTrue(tryIsCancelled(true));
assertTrue(tryIsCancelled(true, true));
assertTrue(tryIsCancelled(true, true, true));
assertFalse(tryIsCancelled(false));
assertFalse(tryIsCancelled(false, true));
assertFalse(tryIsCancelled(true, false));
assertFalse(tryIsCancelled(false, true, true));
assertFalse(tryIsCancelled(true, false, true));
assertFalse(tryIsCancelled(true, true, false));
assertFalse(tryIsCancelled(false, false, true));
assertFalse(tryIsCancelled(false, true, false));
assertFalse(tryIsCancelled(true, false, false));
}
@Test
void requireThatConjunctionCanBeListenedTo() throws InterruptedException {
FutureConjunction conjunction = new FutureConjunction();
RunnableLatch listener = new RunnableLatch();
conjunction.addListener(listener, Runnable::run);
assertTrue(listener.await(600, TimeUnit.SECONDS));
conjunction = new FutureConjunction();
FutureBoolean foo = new FutureBoolean();
conjunction.addOperand(foo);
FutureBoolean bar = new FutureBoolean();
conjunction.addOperand(bar);
listener = new RunnableLatch();
conjunction.addListener(listener, Runnable::run);
assertFalse(listener.await(100, TimeUnit.MILLISECONDS));
foo.set(true);
assertFalse(listener.await(100, TimeUnit.MILLISECONDS));
bar.set(true);
assertTrue(listener.await(600, TimeUnit.SECONDS));
conjunction = new FutureConjunction();
foo = new FutureBoolean();
conjunction.addOperand(foo);
bar = new FutureBoolean();
conjunction.addOperand(bar);
listener = new RunnableLatch();
conjunction.addListener(listener, Runnable::run);
assertFalse(listener.await(100, TimeUnit.MILLISECONDS));
bar.set(true);
assertFalse(listener.await(100, TimeUnit.MILLISECONDS));
foo.set(true);
assertTrue(listener.await(600, TimeUnit.SECONDS));
}
private static boolean tryGet(boolean... operands) throws Exception {
FutureConjunction foo = new FutureConjunction();
FutureConjunction bar = new FutureConjunction();
for (boolean op : operands) {
foo.addOperand(MyFuture.newInstance(op));
bar.addOperand(MyFuture.newInstance(op));
}
boolean fooResult = foo.get();
boolean barResult = foo.get(0, TimeUnit.SECONDS);
assertEquals(fooResult, barResult);
return fooResult;
}
private static boolean tryIsDone(boolean... operands) {
FutureConjunction foo = new FutureConjunction();
for (boolean op : operands) {
foo.addOperand(MyFuture.newIsDone(op));
}
return foo.isDone();
}
private static boolean tryCancel(boolean... operands) {
FutureConjunction foo = new FutureConjunction();
FutureConjunction bar = new FutureConjunction();
for (boolean op : operands) {
foo.addOperand(MyFuture.newCanCancel(op));
bar.addOperand(MyFuture.newCanCancel(op));
}
boolean fooResult = foo.cancel(true);
boolean barResult = foo.cancel(false);
assertEquals(fooResult, barResult);
return fooResult;
}
private static boolean tryIsCancelled(boolean... operands) {
FutureConjunction foo = new FutureConjunction();
for (boolean op : operands) {
foo.addOperand(MyFuture.newIsCancelled(op));
}
return foo.isCancelled();
}
private static class FutureBoolean extends CompletableFuture<Boolean> {
public boolean set(Boolean val) {
return super.complete(val);
}
}
private static class MyFuture extends CompletableFuture<Boolean> {
final boolean value;
final boolean isDone;
final boolean canCancel;
final boolean isCancelled;
MyFuture(boolean value, boolean isDone, boolean canCancel, boolean isCancelled) {
this.value = value;
this.isDone = isDone;
this.canCancel = canCancel;
this.isCancelled = isCancelled;
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return canCancel;
}
@Override
public boolean isCancelled() {
return isCancelled;
}
@Override
public boolean isDone() {
return isDone;
}
@Override
public Boolean get() {
return value;
}
@Override
public Boolean get(long timeout, TimeUnit unit) {
return value;
}
static CompletableFuture<Boolean> newInstance(boolean value) {
return new MyFuture(value, false, false, false);
}
static CompletableFuture<Boolean> newIsDone(boolean isDone) {
return new MyFuture(false, isDone, false, false);
}
static CompletableFuture<Boolean> newCanCancel(boolean canCancel) {
return new MyFuture(false, false, canCancel, false);
}
static CompletableFuture<Boolean> newIsCancelled(boolean isCancelled) {
return new MyFuture(false, false, false, isCancelled);
}
}
}
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