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    • rx.internal.operators.OperatorWithLatestFromMany Maven / Gradle / Ivy

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    /**
 * 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.Arrays;
import java.util.concurrent.atomic.*;

import rx.*;
import rx.Observable.OnSubscribe;
import rx.exceptions.Exceptions;
import rx.functions.FuncN;
import rx.observers.SerializedSubscriber;
import rx.plugins.RxJavaHooks;

public final class OperatorWithLatestFromMany implements OnSubscribe {
    final Observable main;
    
    final Observable[] others;
    
    final Iterable> othersIterable;
    
    final FuncN combiner;
    
    public OperatorWithLatestFromMany(Observable main, Observable[] others, Iterable> othersIterable, FuncN combiner) {
        this.main = main;
        this.others = others;
        this.othersIterable = othersIterable;
        this.combiner = combiner;
    }

    @Override
    public void call(Subscriber t) {
        SerializedSubscriber serial = new SerializedSubscriber(t);
        
        
        Observable[] sources;
        int n = 0;
        
        if (others != null) {
            sources = others;
            n = sources.length;
        } else {
            sources = new Observable[8];
            for (Observable o : othersIterable) {
                if (n == sources.length) {
                    sources = Arrays.copyOf(sources, n + (n >> 2));
                }
                sources[n++] = o;
            }
        }
            
        WithLatestMainSubscriber parent = new WithLatestMainSubscriber(t, combiner, n);
    
        serial.add(parent);

            
        for (int i = 0; i < n; i++) {
            if (serial.isUnsubscribed()) {
                return;
            }
            
            WithLatestOtherSubscriber inner = new WithLatestOtherSubscriber(parent, i + 1);
            parent.add(inner);
            
            Observable o = sources[i];
            o.unsafeSubscribe(inner);
        }
        
        main.unsafeSubscribe(parent);
    }
    
    static final class WithLatestMainSubscriber extends Subscriber {
        final Subscriber actual;
        
        final FuncN combiner;
        
        final AtomicReferenceArray current;
        
        static final Object EMPTY = new Object();
        
        final AtomicInteger ready;
        
        boolean done;
        
        public WithLatestMainSubscriber(Subscriber actual, FuncN combiner, int n) {
            this.actual = actual;
            this.combiner = combiner;
            
            AtomicReferenceArray array = new AtomicReferenceArray(n + 1);
            for (int i = 0; i <= n; i++) {
                array.lazySet(i, EMPTY);
            }
            this.current = array;
            
            this.ready = new AtomicInteger(n);
            this.request(0);
        }
        
        @Override
        public void onNext(T t) {
            if (done) {
                return;
            }
            if (ready.get() == 0) {
                
                AtomicReferenceArray array = current;
                int n = array.length();
                array.lazySet(0, t);
                
                Object[] copy = new Object[array.length()];
                for (int i = 0; i < n; i++) {
                    copy[i] = array.get(i);
                }
                
                R result;
                
                try {
                    result = combiner.call(copy);
                } catch (Throwable ex) {
                    Exceptions.throwIfFatal(ex);
                    onError(ex);
                    return;
                }
                
                actual.onNext(result);
            } else {
                request(1);
            }
        }
        
        @Override
        public void onError(Throwable e) {
            if (done) {
                RxJavaHooks.onError(e);
                return;
            }
            done = true;
            unsubscribe();
            actual.onError(e);
        }
        
        @Override
        public void onCompleted() {
            if (done) {
                return;
            }
            done = true;
            unsubscribe();
            actual.onCompleted();
        }
        
        @Override
        public void setProducer(Producer p) {
            super.setProducer(p);
            actual.setProducer(p);
        }
        
        void innerNext(int index, Object o) {
            Object last = current.getAndSet(index, o);
            if (last == EMPTY) {
                ready.decrementAndGet();
            }
        }
        
        void innerError(int index, Throwable e) {
            onError(e);
        }
        
        void innerComplete(int index) {
            if (current.get(index) == EMPTY) {
                onCompleted();
            }
        }
    }
    
    static final class WithLatestOtherSubscriber extends Subscriber {
        final WithLatestMainSubscriber parent;
        
        final int index;

        public WithLatestOtherSubscriber(WithLatestMainSubscriber parent, int index) {
            this.parent = parent;
            this.index = index;
        }
        
        @Override
        public void onNext(Object t) {
            parent.innerNext(index, t);
        }
        
        @Override
        public void onError(Throwable e) {
            parent.innerError(index, e);
        }
        
        @Override
        public void onCompleted() {
            parent.innerComplete(index);
        }
    }
}
    
    
    
    

    




    
    
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