/**
* 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.single;
import java.util.concurrent.atomic.
AtomicInteger;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.internal.functions.
ObjectHelper;
import io.reactivex.plugins.
RxJavaPlugins;
public final class
SingleEquals<T> extends
Single<
Boolean> {
final
SingleSource<? extends T>
first;
final
SingleSource<? extends T>
second;
public
SingleEquals(
SingleSource<? extends T>
first,
SingleSource<? extends T>
second) {
this.
first =
first;
this.
second =
second;
}
@
Override
protected void
subscribeActual(final
SingleObserver<? super
Boolean>
observer) {
final
AtomicInteger count = new
AtomicInteger();
final
Object[]
values = { null, null };
final
CompositeDisposable set = new
CompositeDisposable();
observer.
onSubscribe(
set);
first.
subscribe(new
InnerObserver<T>(0,
set,
values,
observer,
count));
second.
subscribe(new
InnerObserver<T>(1,
set,
values,
observer,
count));
}
static class
InnerObserver<T> implements
SingleObserver<T> {
final int
index;
final
CompositeDisposable set;
final
Object[]
values;
final
SingleObserver<? super
Boolean>
downstream;
final
AtomicInteger count;
InnerObserver(int
index,
CompositeDisposable set,
Object[]
values,
SingleObserver<? super
Boolean>
observer,
AtomicInteger count) {
this.
index =
index;
this.
set =
set;
this.
values =
values;
this.
downstream =
observer;
this.
count =
count;
}
@
Override
public void
onSubscribe(
Disposable d) {
set.
add(
d);
}
@
Override
public void
onSuccess(T
value) {
values[
index] =
value;
if (
count.
incrementAndGet() == 2) {
downstream.
onSuccess(
ObjectHelper.
equals(
values[0],
values[1]));
}
}
@
Override
public void
onError(
Throwable e) {
for (;;) {
int
state =
count.
get();
if (
state >= 2) {
RxJavaPlugins.
onError(
e);
return;
}
if (
count.
compareAndSet(
state, 2)) {
set.
dispose();
downstream.
onError(
e);
return;
}
}
}
}
}