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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.Callable;

import org.reactivestreams.*;

import io.reactivex.Flowable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.subscriptions.EmptySubscription;

public final class FlowableDefer extends Flowable {
    final Callable> supplier;
    public FlowableDefer(Callable> supplier) {
        this.supplier = supplier;
    }

    @Override
    public void subscribeActual(Subscriber s) {
        Publisher pub;
        try {
            pub = ObjectHelper.requireNonNull(supplier.call(), "The publisher supplied is null");
        } catch (Throwable t) {
            Exceptions.throwIfFatal(t);
            EmptySubscription.error(t, s);
            return;
        }

        pub.subscribe(s);
    }
}