hu.akarnokd.rxjava2.internal.operators.PublisherDelaySubscriptionOther Maven / Gradle / Ivy

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rxjava2-backport developed by David Karnok
There is a newer version: 2.0.0-RC3
/**
 * Copyright 2015 David Karnok and 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 hu.akarnokd.rxjava2.internal.operators;

import org.reactivestreams.*;

import hu.akarnokd.rxjava2.internal.subscriptions.SubscriptionArbiter;
import hu.akarnokd.rxjava2.plugins.RxJavaPlugins;

/**
 * Delays the subscription to the main source until the other
 * observable fires an event or completes.
 * @param  the main type
 * @param  the other value type, ignored
 */
public final class PublisherDelaySubscriptionOther implements Publisher {
    final Publisher main;
    final Publisher other;
    
    public PublisherDelaySubscriptionOther(Publisher main, Publisher other) {
        this.main = main;
        this.other = other;
    }
    
    @Override
    public void subscribe(final Subscriber child) {
        final SubscriptionArbiter serial = new SubscriptionArbiter();
        child.onSubscribe(serial);
        
        Subscriber otherSubscriber = new Subscriber() {
            boolean done;
            
            @Override
            public void onSubscribe(final Subscription s) {
                serial.setSubscription(new Subscription() {
                    @Override
                    public void request(long n) {
                        // ignored
                    }
                    
                    @Override
                    public void cancel() {
                        s.cancel();
                    }
                });
                s.request(Long.MAX_VALUE);
            }
            
            @Override
            public void onNext(U t) {
                onComplete();
            }
            
            @Override
            public void onError(Throwable e) {
                if (done) {
                    RxJavaPlugins.onError(e);
                    return;
                }
                done = true;
                child.onError(e);
            }
            
            @Override
            public void onComplete() {
                if (done) {
                    return;
                }
                done = true;
                
                main.subscribe(new Subscriber() {
                    @Override
                    public void onSubscribe(Subscription s) {
                        serial.setSubscription(s);
                    }
                    
                    @Override
                    public void onNext(T t) {
                        child.onNext(t);
                    }
                    
                    @Override
                    public void onError(Throwable t) {
                        child.onError(t);
                    }
                    
                    @Override
                    public void onComplete() {
                        child.onComplete();
                    }
                });
            }
        };
        
        other.subscribe(otherSubscriber);
    }
}