rx.internal.operators.OnSubscribeLift Maven / Gradle / Ivy
/**
* Copyright 2016 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 rx.Observable.*;
import rx.Subscriber;
import rx.exceptions.Exceptions;
import rx.plugins.RxJavaHooks;
/**
* Transforms the downstream Subscriber into a Subscriber via an operator
* callback and calls the parent OnSubscribe.call() method with it.
* @param the source value type
* @param the result value type
*/
public final class OnSubscribeLift implements OnSubscribe {
final OnSubscribe parent;
final Operator extends R, ? super T> operator;
public OnSubscribeLift(OnSubscribe parent, Operator extends R, ? super T> operator) {
this.parent = parent;
this.operator = operator;
}
@Override
public void call(Subscriber super R> o) {
try {
Subscriber super T> st = RxJavaHooks.onObservableLift(operator).call(o);
try {
// new Subscriber created and being subscribed with so 'onStart' it
st.onStart();
parent.call(st);
} catch (Throwable e) {
// localized capture of errors rather than it skipping all operators
// and ending up in the try/catch of the subscribe method which then
// prevents onErrorResumeNext and other similar approaches to error handling
Exceptions.throwIfFatal(e);
st.onError(e);
}
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
// if the lift function failed all we can do is pass the error to the final Subscriber
// as we don't have the operator available to us
o.onError(e);
}
}
}
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