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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.observable;

import java.util.concurrent.*;

import io.reactivex.*;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.*;
import io.reactivex.internal.observers.*;
import io.reactivex.internal.util.*;

/**
 * Utility methods to consume an Observable in a blocking manner with callbacks or Observer.
 */
public final class ObservableBlockingSubscribe {

    /** Utility class. */
    private ObservableBlockingSubscribe() {
        throw new IllegalStateException("No instances!");
    }

    /**
     * Subscribes to the source and calls the Observer methods on the current thread.
     * 

* @param o the source ObservableSource * The call to dispose() is composed through. * @param observer the subscriber to forward events and calls to in the current thread * @param the value type */ public static void subscribe(ObservableSource o, Observer observer) { final BlockingQueue queue = new LinkedBlockingQueue(); BlockingObserver bs = new BlockingObserver(queue); observer.onSubscribe(bs); o.subscribe(bs); for (;;) { if (bs.isDisposed()) { break; } Object v = queue.poll(); if (v == null) { try { v = queue.take(); } catch (InterruptedException ex) { bs.dispose(); observer.onError(ex); return; } } if (bs.isDisposed() || o == BlockingObserver.TERMINATED || NotificationLite.acceptFull(v, observer)) { break; } } } /** * Runs the source observable to a terminal event, ignoring any values and rethrowing any exception. * @param o the source ObservableSource * @param the value type */ public static void subscribe(ObservableSource o) { BlockingIgnoringReceiver callback = new BlockingIgnoringReceiver(); LambdaObserver ls = new LambdaObserver(Functions.emptyConsumer(), callback, callback, Functions.emptyConsumer()); o.subscribe(ls); BlockingHelper.awaitForComplete(callback, ls); Throwable e = callback.error; if (e != null) { throw ExceptionHelper.wrapOrThrow(e); } } /** * Subscribes to the source and calls the given actions on the current thread. * @param o the source ObservableSource * @param onNext the callback action for each source value * @param onError the callback action for an error event * @param onComplete the callback action for the completion event. * @param the value type */ public static void subscribe(ObservableSource o, final Consumer onNext, final Consumer onError, final Action onComplete) { ObjectHelper.requireNonNull(onNext, "onNext is null"); ObjectHelper.requireNonNull(onError, "onError is null"); ObjectHelper.requireNonNull(onComplete, "onComplete is null"); subscribe(o, new LambdaObserver(onNext, onError, onComplete, Functions.emptyConsumer())); } }