rx.internal.operators.OperatorMapNotification Maven / Gradle / Ivy

Go to download
/**
 * Copyright 2014 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 java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicLong;

import rx.*;
import rx.Observable.Operator;
import rx.exceptions.*;
import rx.functions.*;
import rx.internal.producers.ProducerArbiter;
import rx.internal.util.unsafe.*;

/**
 * Applies a function of your choosing to every item emitted by an {@code Observable}, and emits the results of
 * this transformation as a new {@code Observable}.
 * 
 * 
 */
public final class OperatorMapNotification implements Operator {

    private final Func1 onNext;
    private final Func1 onError;
    private final Func0 onCompleted;

    public OperatorMapNotification(Func1 onNext, Func1 onError, Func0 onCompleted) {
        this.onNext = onNext;
        this.onError = onError;
        this.onCompleted = onCompleted;
    }

    @Override
    public Subscriber call(final Subscriber o) {
        final ProducerArbiter pa = new ProducerArbiter();
        
        MapNotificationSubscriber subscriber = new MapNotificationSubscriber(pa, o);
        o.add(subscriber);
        subscriber.init();
        return subscriber;
    }
    
    final class MapNotificationSubscriber extends Subscriber {
        private final Subscriber o;
        private final ProducerArbiter pa;
        final SingleEmitter emitter;
        
        private MapNotificationSubscriber(ProducerArbiter pa, Subscriber o) {
            this.pa = pa;
            this.o = o;
            this.emitter = new SingleEmitter(o, pa, this);
        }
        
        void init() {
            o.setProducer(emitter);
        }

        @Override
        public void setProducer(Producer producer) {
            pa.setProducer(producer);
        }

        @Override
        public void onCompleted() {
            try {
                emitter.offerAndComplete(onCompleted.call());
            } catch (Throwable e) {
                Exceptions.throwOrReport(e, o);
            }
        }

        @Override
        public void onError(Throwable e) {
            try {
                emitter.offerAndComplete(onError.call(e));
            } catch (Throwable e2) {
                Exceptions.throwOrReport(e2, o);
            }
        }

        @Override
        public void onNext(T t) {
            try {
                emitter.offer(onNext.call(t));
            } catch (Throwable e) {
                Exceptions.throwOrReport(e, o, t);
            }
        }
    }
    static final class SingleEmitter extends AtomicLong implements Producer, Subscription {
        /** */
        private static final long serialVersionUID = -249869671366010660L;
        final NotificationLite nl;
        final Subscriber child;
        final Producer producer;
        final Subscription cancel;
        final Queue