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RxJava 3.x extra sources, operators and components and ports of many 1.x companion libraries.

There is a newer version: 3.1.1

/*
 * Copyright 2016-2019 David Karnok
 *
 * 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 hu.akarnokd.rxjava3.debug;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;

/**
 * Wraps a Publisher and inject the assembly info.
 *
 * @param  the value type
 */
final class SingleOnAssembly extends Single {

    final SingleSource source;

    final RxJavaAssemblyException assembled;

    SingleOnAssembly(SingleSource source) {
        this.source = source;
        this.assembled = new RxJavaAssemblyException();
    }

    @Override
    protected void subscribeActual(SingleObserver observer) {
        source.subscribe(new OnAssemblySingleObserver(observer, assembled));
    }

    static final class OnAssemblySingleObserver implements SingleObserver, Disposable {

        final SingleObserver downstream;

        final RxJavaAssemblyException assembled;

        Disposable upstream;

        OnAssemblySingleObserver(SingleObserver downstream, RxJavaAssemblyException assembled) {
            this.downstream = downstream;
            this.assembled = assembled;
        }

        @Override
        public void onSubscribe(Disposable d) {
            if (DisposableHelper.validate(this.upstream, d)) {
                this.upstream = d;

                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onSuccess(T value) {
            downstream.onSuccess(value);
        }

        @Override
        public void onError(Throwable t) {
            downstream.onError(assembled.appendLast(t));
        }

        @Override
        public boolean isDisposed() {
            return upstream.isDisposed();
        }

        @Override
        public void dispose() {
            // don't break the link here
            upstream.dispose();
        }
    }
}