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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.flowable;

import java.util.concurrent.*;

import org.reactivestreams.Subscriber;

import io.reactivex.Flowable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.subscriptions.DeferredScalarSubscription;

public final class FlowableFromFuture extends Flowable {
    final Future future;
    final long timeout;
    final TimeUnit unit;

    public FlowableFromFuture(Future future, long timeout, TimeUnit unit) {
        this.future = future;
        this.timeout = timeout;
        this.unit = unit;
    }

    @Override
    public void subscribeActual(Subscriber s) {
        DeferredScalarSubscription deferred = new DeferredScalarSubscription(s);
        s.onSubscribe(deferred);

        T v;
        try {
            v = unit != null ? future.get(timeout, unit) : future.get();
        } catch (Throwable ex) {
            Exceptions.throwIfFatal(ex);
            if (!deferred.isCancelled()) {
                s.onError(ex);
            }
            return;
        }
        if (v == null) {
            s.onError(new NullPointerException("The future returned null"));
        } else {
            deferred.complete(v);
        }
    }
}