hu.akarnokd.rxjava2.internal.operators.completable.CompletableOnSubscribeMergeIterable Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava2-backport Show documentation
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.completable;

import java.util.Iterator;
import java.util.concurrent.atomic.*;

import hu.akarnokd.rxjava2.Completable;
import hu.akarnokd.rxjava2.Completable.*;
import hu.akarnokd.rxjava2.disposables.*;
import hu.akarnokd.rxjava2.plugins.RxJavaPlugins;

public final class CompletableOnSubscribeMergeIterable implements CompletableOnSubscribe {
    final Iterable sources;
    
    public CompletableOnSubscribeMergeIterable(Iterable sources) {
        this.sources = sources;
    }
    
    @Override
    public void accept(final CompletableSubscriber s) {
        final CompositeDisposable set = new CompositeDisposable();
        final AtomicInteger wip = new AtomicInteger(1);
        final AtomicBoolean once = new AtomicBoolean();
        
        s.onSubscribe(set);
        
        Iterator iterator;
        
        try {
            iterator = sources.iterator();
        } catch (Throwable e) {
            s.onError(e);
            return;
        }
        
        if (iterator == null) {
            s.onError(new NullPointerException("The source iterator returned is null"));
            return;
        }
        
        for (;;) {
            if (set.isDisposed()) {
                return;
            }
            
            boolean b;
            try {
                b = iterator.hasNext();
            } catch (Throwable e) {
                set.dispose();
                if (once.compareAndSet(false, true)) {
                    s.onError(e);
                } else {
                    RxJavaPlugins.onError(e);
                }
                return;
            }
                    
            if (!b) {
                break;
            }
            
            if (set.isDisposed()) {
                return;
            }
            
            Completable c;
            
            try {
                c = iterator.next();
            } catch (Throwable e) {
                set.dispose();
                if (once.compareAndSet(false, true)) {
                    s.onError(e);
                } else {
                    RxJavaPlugins.onError(e);
                }
                return;
            }
            
            if (set.isDisposed()) {
                return;
            }
            
            if (c == null) {
                set.dispose();
                NullPointerException npe = new NullPointerException("A completable source is null");
                if (once.compareAndSet(false, true)) {
                    s.onError(npe);
                } else {
                    RxJavaPlugins.onError(npe);
                }
                return;
            }
            
            wip.getAndIncrement();
            
            c.subscribe(new CompletableSubscriber() {
                @Override
                public void onSubscribe(Disposable d) {
                    set.add(d);
                }

                @Override
                public void onError(Throwable e) {
                    set.dispose();
                    if (once.compareAndSet(false, true)) {
                        s.onError(e);
                    } else {
                        RxJavaPlugins.onError(e);
                    }
                }

                @Override
                public void onComplete() {
                    if (wip.decrementAndGet() == 0) {
                        if (once.compareAndSet(false, true)) {
                            s.onComplete();
                        }
                    }
                }
                
            });
        }
        
        if (wip.decrementAndGet() == 0) {
            if (once.compareAndSet(false, true)) {
                s.onComplete();
            }
        }
    }
}