rx.internal.operators.CompletableOnSubscribeConcatIterable Maven / Gradle / Ivy
/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx.internal.operators;
import java.util.Iterator;
import java.util.concurrent.atomic.AtomicInteger;
import rx.*;
import rx.Completable.OnSubscribe;
import rx.subscriptions.*;
public final class CompletableOnSubscribeConcatIterable implements OnSubscribe {
final Iterable extends Completable> sources;
public CompletableOnSubscribeConcatIterable(Iterable extends Completable> sources) {
this.sources = sources;
}
@Override
public void call(CompletableSubscriber s) {
Iterator extends Completable> it;
try {
it = sources.iterator();
} catch (Throwable e) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(e);
return;
}
if (it == null) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(new NullPointerException("The iterator returned is null"));
return;
}
ConcatInnerSubscriber inner = new ConcatInnerSubscriber(s, it);
s.onSubscribe(inner.sd);
inner.next();
}
static final class ConcatInnerSubscriber extends AtomicInteger implements CompletableSubscriber {
/** */
private static final long serialVersionUID = -7965400327305809232L;
final CompletableSubscriber actual;
final Iterator extends Completable> sources;
final SerialSubscription sd;
public ConcatInnerSubscriber(CompletableSubscriber actual, Iterator extends Completable> sources) {
this.actual = actual;
this.sources = sources;
this.sd = new SerialSubscription();
}
@Override
public void onSubscribe(Subscription d) {
sd.set(d);
}
@Override
public void onError(Throwable e) {
actual.onError(e);
}
@Override
public void onCompleted() {
next();
}
void next() {
if (sd.isUnsubscribed()) {
return;
}
if (getAndIncrement() != 0) {
return;
}
Iterator extends Completable> a = sources;
do {
if (sd.isUnsubscribed()) {
return;
}
boolean b;
try {
b = a.hasNext();
} catch (Throwable ex) {
actual.onError(ex);
return;
}
if (!b) {
actual.onCompleted();
return;
}
Completable c;
try {
c = a.next();
} catch (Throwable ex) {
actual.onError(ex);
return;
}
if (c == null) {
actual.onError(new NullPointerException("The completable returned is null"));
return;
}
c.unsafeSubscribe(this);
} while (decrementAndGet() != 0);
}
}
}
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