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Reactive Extensions for Java
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/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.internal.operators.completable;

import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.*;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.plugins.RxJavaPlugins;

public final class CompletableUsing extends Completable {

    final Callable resourceSupplier;
    final Function completableFunction;
    final Consumer disposer;
    final boolean eager;

    public CompletableUsing(Callable resourceSupplier,
                            Function completableFunction, Consumer disposer,
                            boolean eager) {
        this.resourceSupplier = resourceSupplier;
        this.completableFunction = completableFunction;
        this.disposer = disposer;
        this.eager = eager;
    }

    @Override
    protected void subscribeActual(CompletableObserver observer) {
        R resource;

        try {
            resource = resourceSupplier.call();
        } catch (Throwable ex) {
            Exceptions.throwIfFatal(ex);
            EmptyDisposable.error(ex, observer);
            return;
        }

        CompletableSource source;

        try {
            source = ObjectHelper.requireNonNull(completableFunction.apply(resource), "The completableFunction returned a null CompletableSource");
        } catch (Throwable ex) {
            Exceptions.throwIfFatal(ex);
            if (eager) {
                try {
                    disposer.accept(resource);
                } catch (Throwable exc) {
                    Exceptions.throwIfFatal(exc);
                    EmptyDisposable.error(new CompositeException(ex, exc), observer);
                    return;
                }
            }

            EmptyDisposable.error(ex, observer);

            if (!eager) {
                try {
                    disposer.accept(resource);
                } catch (Throwable exc) {
                    Exceptions.throwIfFatal(exc);
                    RxJavaPlugins.onError(exc);
                }
            }
            return;
        }

        source.subscribe(new UsingObserver(observer, resource, disposer, eager));
    }

    static final class UsingObserver
    extends AtomicReference