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/*
* 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.rxjava3.internal.observers;
import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.SingleObserver;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Wraps another {@link SingleObserver} and catches exceptions thrown by its
* {@code onSubscribe}, {@code onSuccess} or {@code onError} methods despite
* the protocol forbids it.
*
* Such exceptions are routed to the {@link RxJavaPlugins#onError(Throwable)} handler.
*
* @param the element type of the sequence
* @since 3.0.0
*/
public final class SafeSingleObserver implements SingleObserver {
final SingleObserver super T> downstream;
boolean onSubscribeFailed;
public SafeSingleObserver(SingleObserver super T> downstream) {
this.downstream = downstream;
}
@Override
public void onSubscribe(@NonNull Disposable d) {
try {
downstream.onSubscribe(d);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
onSubscribeFailed = true;
d.dispose();
RxJavaPlugins.onError(ex);
}
}
@Override
public void onSuccess(@NonNull T t) {
if (!onSubscribeFailed) {
try {
downstream.onSuccess(t);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
RxJavaPlugins.onError(ex);
}
}
}
@Override
public void onError(@NonNull Throwable e) {
if (onSubscribeFailed) {
RxJavaPlugins.onError(e);
} else {
try {
downstream.onError(e);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
RxJavaPlugins.onError(new CompositeException(e, ex));
}
}
}
}