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rxjava2-extensions developed by David Karnok

There is a newer version: 0.20.10

/*
 * Copyright 2016-2018 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.rxjava2.debug;

import io.reactivex.*;
import io.reactivex.internal.fuseable.QueueDisposable;
import io.reactivex.internal.observers.BasicFuseableObserver;

/**
 * Wraps a ObservableSource and inject the assembly info.
 *
 * @param  the value type
 */
final class ObservableOnAssembly extends Observable {

    final ObservableSource source;

    final RxJavaAssemblyException assembled;

    ObservableOnAssembly(ObservableSource source) {
        this.source = source;
        this.assembled = new RxJavaAssemblyException();
    }

    @Override
    protected void subscribeActual(Observer s) {
        source.subscribe(new OnAssemblyObserver(s, assembled));
    }

    static final class OnAssemblyObserver extends BasicFuseableObserver {

        final RxJavaAssemblyException assembled;

        OnAssemblyObserver(Observer actual, RxJavaAssemblyException assembled) {
            super(actual);
            this.assembled = assembled;
        }

        @Override
        public void onNext(T t) {
            downstream.onNext(t);
        }

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

        @Override
        public int requestFusion(int mode) {
            QueueDisposable qs = this.qd;
            if (qs != null) {
                int m = qs.requestFusion(mode);
                sourceMode = m;
                return m;
            }
            return NONE;
        }

        @Override
        public T poll() throws Exception {
            return qd.poll();
        }
    }
}