/**
* 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.*;
import rx.*;
import rx.
Completable.
OnSubscribe;
import rx.plugins.
RxJavaHooks;
import rx.subscriptions.
CompositeSubscription;
public final class
CompletableOnSubscribeMergeIterable implements
OnSubscribe {
final
Iterable<? extends
Completable>
sources;
public
CompletableOnSubscribeMergeIterable(
Iterable<? extends
Completable>
sources) {
this.
sources =
sources;
}
@
Override
public void
call(final
CompletableSubscriber s) {
final
CompositeSubscription set = new
CompositeSubscription();
s.
onSubscribe(
set);
Iterator<? extends
Completable>
iterator;
try {
iterator =
sources.
iterator();
} catch (
Throwable e) {
s.
onError(
e);
return;
}
if (
iterator == null) {
s.
onError(new
NullPointerException("The source iterator returned is null"));
return;
}
final
AtomicInteger wip = new
AtomicInteger(1);
final
AtomicBoolean once = new
AtomicBoolean();
for (;;) {
if (
set.
isUnsubscribed()) {
return;
}
boolean
b;
try {
b =
iterator.
hasNext();
} catch (
Throwable e) {
set.
unsubscribe();
if (
once.
compareAndSet(false, true)) {
s.
onError(
e);
} else {
RxJavaHooks.
onError(
e);
}
return;
}
if (!
b) {
break;
}
if (
set.
isUnsubscribed()) {
return;
}
Completable c;
try {
c =
iterator.
next();
} catch (
Throwable e) {
set.
unsubscribe();
if (
once.
compareAndSet(false, true)) {
s.
onError(
e);
} else {
RxJavaHooks.
onError(
e);
}
return;
}
if (
set.
isUnsubscribed()) {
return;
}
if (
c == null) {
set.
unsubscribe();
NullPointerException npe = new
NullPointerException("A completable source is null");
if (
once.
compareAndSet(false, true)) {
s.
onError(
npe);
} else {
RxJavaHooks.
onError(
npe);
}
return;
}
wip.
getAndIncrement();
c.
unsafeSubscribe(new
CompletableSubscriber() {
@
Override
public void
onSubscribe(
Subscription d) {
set.
add(
d);
}
@
Override
public void
onError(
Throwable e) {
set.
unsubscribe();
if (
once.
compareAndSet(false, true)) {
s.
onError(
e);
} else {
RxJavaHooks.
onError(
e);
}
}
@
Override
public void
onCompleted() {
if (
wip.
decrementAndGet() == 0) {
if (
once.
compareAndSet(false, true)) {
s.
onCompleted();
}
}
}
});
}
if (
wip.
decrementAndGet() == 0) {
if (
once.
compareAndSet(false, true)) {
s.
onCompleted();
}
}
}
}