/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex.internal.operators.maybe;
import java.util.concurrent.*;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.
Exceptions;
/**
* Waits until the source Future completes or the wait times out; treats a {@code null}
* result as indication to signal {@code onComplete} instead of {@code onSuccess}.
*
* @param <T> the value type
*/
public final class
MaybeFromFuture<T> extends
Maybe<T> {
final
Future<? extends T>
future;
final long
timeout;
final
TimeUnit unit;
public
MaybeFromFuture(
Future<? extends T>
future, long
timeout,
TimeUnit unit) {
this.
future =
future;
this.
timeout =
timeout;
this.
unit =
unit;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super T>
observer) {
Disposable d =
Disposables.
empty();
observer.
onSubscribe(
d);
if (!
d.
isDisposed()) {
T
v;
try {
if (
timeout <= 0L) {
v =
future.
get();
} else {
v =
future.
get(
timeout,
unit);
}
} catch (
Throwable ex) {
if (
ex instanceof
ExecutionException) {
ex =
ex.
getCause();
}
Exceptions.
throwIfFatal(
ex);
if (!
d.
isDisposed()) {
observer.
onError(
ex);
}
return;
}
if (!
d.
isDisposed()) {
if (
v == null) {
observer.
onComplete();
} else {
observer.
onSuccess(
v);
}
}
}
}
}