@Test
public void reduceForJavaApiMustWork() throws Exception {
LinkedList<Future<String>> listFutures = new LinkedList<Future<String>>();
StringBuilder expected = new StringBuilder();
for (int i = 0; i < 10; i++) {
expected.append("test");
listFutures.add(
Futures.future(
new Callable<String>() {
public String call() {
return "test";
}
},
system.dispatcher()));
}
Future<String> result =
Futures.reduce(
listFutures,
new Function2<String, String, String>() {
public String apply(String r, String t) {
return r + t;
}
},
system.dispatcher());
assertEquals(Await.result(result, timeout), expected.toString());
}
@Test
public void findForJavaApiMustWork() throws Exception {
LinkedList<Future<Integer>> listFutures = new LinkedList<Future<Integer>>();
for (int i = 0; i < 10; i++) {
final Integer fi = i;
listFutures.add(
Futures.future(
new Callable<Integer>() {
public Integer call() {
return fi;
}
},
system.dispatcher()));
}
final Integer expect = 5;
Future<Option<Integer>> f =
Futures.find(
listFutures,
new Function<Integer, Boolean>() {
public Boolean apply(Integer i) {
return i == 5;
}
},
system.dispatcher());
assertEquals(expect, Await.result(f, timeout).get());
}
@Test
public void traverseForJavaApiMustWork() throws Exception {
LinkedList<String> listStrings = new LinkedList<String>();
LinkedList<String> expectedStrings = new LinkedList<String>();
for (int i = 0; i < 10; i++) {
expectedStrings.add("TEST");
listStrings.add("test");
}
Future<Iterable<String>> result =
Futures.traverse(
listStrings,
new Function<String, Future<String>>() {
public Future<String> apply(final String r) {
return Futures.future(
new Callable<String>() {
public String call() {
return r.toUpperCase();
}
},
system.dispatcher());
}
},
system.dispatcher());
assertEquals(Await.result(result, timeout), expectedStrings);
}
@Test
public void blockMustBeCallable() throws Exception {
Promise<String> p = Futures.promise();
Duration d = Duration.create(1, TimeUnit.SECONDS);
p.success("foo");
Await.ready(p.future(), d);
assertEquals(Await.result(p.future(), d), "foo");
}
@Test
public void mapToMustBeCallable() throws Exception {
Promise<Object> p = Futures.promise();
Future<String> f = p.future().mapTo(classTag(String.class));
Duration d = Duration.create(1, TimeUnit.SECONDS);
p.success("foo");
Await.ready(p.future(), d);
assertEquals(Await.result(p.future(), d), "foo");
}
// TODO: Improve this test, perhaps with an Actor
@Test
public void mustSequenceAFutureList() throws Exception {
LinkedList<Future<String>> listFutures = new LinkedList<Future<String>>();
LinkedList<String> listExpected = new LinkedList<String>();
for (int i = 0; i < 10; i++) {
listExpected.add("test");
listFutures.add(
Futures.future(
new Callable<String>() {
public String call() {
return "test";
}
},
system.dispatcher()));
}
Future<Iterable<String>> futureList = Futures.sequence(listFutures, system.dispatcher());
assertEquals(Await.result(futureList, timeout), listExpected);
}
@Test
public void mustBeAbleToExecuteAnOnResultCallback() throws Throwable {
final CountDownLatch latch = new CountDownLatch(1);
Promise<String> cf = Futures.promise();
Future<String> f = cf.future();
f.onSuccess(
new OnSuccess<String>() {
public void onSuccess(String result) {
if (result.equals("foo")) latch.countDown();
}
},
system.dispatcher());
cf.success("foo");
assertTrue(latch.await(5000, TimeUnit.MILLISECONDS));
assertEquals(Await.result(f, timeout), "foo");
}
@Test
public void mustBeAbleToForeachAFuture() throws Throwable {
final CountDownLatch latch = new CountDownLatch(1);
Promise<String> cf = Futures.promise();
Future<String> f = cf.future();
f.foreach(
new Foreach<String>() {
public void each(String future) {
latch.countDown();
}
},
system.dispatcher());
cf.success("foo");
assertTrue(latch.await(5000, TimeUnit.MILLISECONDS));
assertEquals(Await.result(f, timeout), "foo");
}
@Test
public void mustBeAbleToExecuteAnOnExceptionCallback() throws Throwable {
final CountDownLatch latch = new CountDownLatch(1);
Promise<String> cf = Futures.promise();
Future<String> f = cf.future();
f.onFailure(
new OnFailure() {
public void onFailure(Throwable t) {
if (t instanceof NullPointerException) latch.countDown();
}
},
system.dispatcher());
Throwable exception = new NullPointerException();
cf.failure(exception);
assertTrue(latch.await(5000, TimeUnit.MILLISECONDS));
assertEquals(f.value().get().failed().get(), exception);
}
@Test
public void recoverWithToMustBeCallable() throws Exception {
final IllegalStateException fail = new IllegalStateException("OHNOES");
Promise<Object> p = Futures.promise();
Future<Object> f =
p.future()
.recoverWith(
new Recover<Future<Object>>() {
public Future<Object> recover(Throwable t) throws Throwable {
if (t == fail) return Futures.<Object>successful("foo");
else throw t;
}
},
system.dispatcher());
Duration d = Duration.create(1, TimeUnit.SECONDS);
p.failure(fail);
assertEquals(Await.result(f, d), "foo");
}
@Test
public void mustBeAbleToFilterAFuture() throws Throwable {
final CountDownLatch latch = new CountDownLatch(1);
Promise<String> cf = Futures.promise();
Future<String> f = cf.future();
Future<String> r =
f.filter(
Filter.filterOf(
new Function<String, Boolean>() {
public Boolean apply(String r) {
latch.countDown();
return r.equals("foo");
}
}),
system.dispatcher());
cf.success("foo");
assertTrue(latch.await(5000, TimeUnit.MILLISECONDS));
assertEquals(Await.result(f, timeout), "foo");
assertEquals(Await.result(r, timeout), "foo");
}
@Test
public void mustBeAbleToMapAFuture() throws Exception {
Future<String> f1 =
Futures.future(
new Callable<String>() {
public String call() {
return "Hello";
}
},
system.dispatcher());
Future<String> f2 =
f1.map(
new Mapper<String, String>() {
public String apply(String s) {
return s + " World";
}
},
system.dispatcher());
assertEquals("Hello World", Await.result(f2, timeout));
}
@Test
public void mustBeAbleToFlatMapAFuture() throws Throwable {
final CountDownLatch latch = new CountDownLatch(1);
Promise<String> cf = Futures.promise();
cf.success("1000");
Future<String> f = cf.future();
Future<Integer> r =
f.flatMap(
new Mapper<String, Future<Integer>>() {
public Future<Integer> checkedApply(String r) throws Throwable {
if (false) throw new IOException("Just here to make sure this compiles.");
latch.countDown();
Promise<Integer> cf = Futures.promise();
cf.success(Integer.parseInt(r));
return cf.future();
}
},
system.dispatcher());
assertEquals(Await.result(f, timeout), "1000");
assertEquals(Await.result(r, timeout).intValue(), 1000);
assertTrue(latch.await(5000, TimeUnit.MILLISECONDS));
}