/**
* 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.completable;
import java.util.
Iterator;
import java.util.concurrent.atomic.
AtomicInteger;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.
ObjectHelper;
public final class
CompletableConcatIterable extends
Completable {
final
Iterable<? extends
CompletableSource>
sources;
public
CompletableConcatIterable(
Iterable<? extends
CompletableSource>
sources) {
this.
sources =
sources;
}
@
Override
public void
subscribeActual(
CompletableObserver observer) {
Iterator<? extends
CompletableSource>
it;
try {
it =
ObjectHelper.
requireNonNull(
sources.
iterator(), "The iterator returned is null");
} catch (
Throwable e) {
Exceptions.
throwIfFatal(
e);
EmptyDisposable.
error(
e,
observer);
return;
}
ConcatInnerObserver inner = new
ConcatInnerObserver(
observer,
it);
observer.
onSubscribe(
inner.
sd);
inner.
next();
}
static final class
ConcatInnerObserver extends
AtomicInteger implements
CompletableObserver {
private static final long
serialVersionUID = -7965400327305809232L;
final
CompletableObserver downstream;
final
Iterator<? extends
CompletableSource>
sources;
final
SequentialDisposable sd;
ConcatInnerObserver(
CompletableObserver actual,
Iterator<? extends
CompletableSource>
sources) {
this.
downstream =
actual;
this.
sources =
sources;
this.
sd = new
SequentialDisposable();
}
@
Override
public void
onSubscribe(
Disposable d) {
sd.
replace(
d);
}
@
Override
public void
onError(
Throwable e) {
downstream.
onError(
e);
}
@
Override
public void
onComplete() {
next();
}
void
next() {
if (
sd.
isDisposed()) {
return;
}
if (
getAndIncrement() != 0) {
return;
}
Iterator<? extends
CompletableSource>
a =
sources;
do {
if (
sd.
isDisposed()) {
return;
}
boolean
b;
try {
b =
a.
hasNext();
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(
ex);
return;
}
if (!
b) {
downstream.
onComplete();
return;
}
CompletableSource c;
try {
c =
ObjectHelper.
requireNonNull(
a.
next(), "The CompletableSource returned is null");
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
downstream.
onError(
ex);
return;
}
c.
subscribe(this);
} while (
decrementAndGet() != 0);
}
}
}