atom.app.DisruptorNotificationManager Maven / Gradle / Ivy

Go to download
/*
 * Copyright © 2013 Geeoz, and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Research Projects is dual-licensed under the GNU General Public
 * License, version 2.0 (GPLv2) and the Geeoz Commercial License.
 *
 * Solely for non-commercial purposes. A purpose is non-commercial only if
 * it is in no manner primarily intended for or directed toward commercial
 * advantage or private monetary compensation.
 *
 * This Geeoz Software is supplied to you by Geeoz in consideration of your
 * agreement to the following terms, and your use, installation, modification
 * or redistribution of this Geeoz Software constitutes acceptance of these
 * terms. If you do not agree with these terms, please do not use, install,
 * modify or redistribute this Geeoz Software.
 *
 * Neither the name, trademarks, service marks or logos of Geeoz may be used
 * to endorse or promote products derived from the Geeoz Software without
 * specific prior written permission from Geeoz.
 *
 * The Geeoz Software is provided by Geeoz on an "AS IS" basis. GEEOZ MAKES NO
 * WARRANTIES, EXPRESS  OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, REGARDING THE GEEOZ SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
 * COMBINATION WITH YOUR PRODUCTS.
 *
 * IN NO EVENT SHALL GEEOZ BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION
 * AND/OR DISTRIBUTION OF THE GEEOZ SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER
 * THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR
 * OTHERWISE, EVEN IF GEEOZ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * A copy of the GNU General Public License is included in the distribution in
 * the file LICENSE and at
 *
 *     http://www.gnu.org/licenses/gpl-2.0.html
 *
 * If you are using the Research Projects for commercial purposes, we
 * encourage you to visit
 *
 *     http://products.geeoz.com/license
 *
 * for more details.
 *
 * This software or hardware and documentation may provide access to
 * or information on content, products, and services from third parties.
 * Geeoz and its affiliates are not responsible for and expressly disclaim
 * all warranties of any kind with respect to third-party content, products,
 * and services. Geeoz and its affiliates will not be responsible for any loss,
 * costs, or damages incurred due to your access to or use of third-party
 * content, products, or services. If a third-party content exists, the
 * additional copyright notices and license terms applicable to portions of the
 * software are set forth in the THIRD_PARTY_LICENSE_README file.
 *
 * Please contact Geeoz or visit www.geeoz.com if you need additional
 * information or have any questions.
 */

package atom.app;

import atom.content.Context;
import atom.content.Intent;
import atom.content.pm.NotifierInfo;
import atom.content.pm.PackageManager;
import com.lmax.disruptor.BatchEventProcessor;
import com.lmax.disruptor.EventFactory;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.YieldingWaitStrategy;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Notification manager implementation that based on Disruptor.
 *
 * @author Alex Voloshyn
 * @version 1.0 10/30/13
 */
public final class DisruptorNotificationManager implements NotificationManager {
    /**
     * Number of the separate event processors.
     */
    private static final int NUM_EVENT_PROC = 1;
    /**
     * Ring buffer size.
     */
    private static final int RING_BUFFER_SIZE = 32;
    /**
     * Package manager service.
     */
    private static final PackageManager PACKAGES =
            Context.getSystemService(PackageManager.class);
    /**
     * Intents ring buffer.
     */
    private static final RingBuffer BUFFER =
            RingBuffer.createMultiProducer(Event.FACTORY,
                    RING_BUFFER_SIZE, new YieldingWaitStrategy());

    static {
        final BatchEventProcessor processor =
                new BatchEventProcessor<>(BUFFER, BUFFER.newBarrier(),
                        new Handler());

        final ExecutorService executor =
                Executors.newFixedThreadPool(NUM_EVENT_PROC);
        executor.execute(processor);
    }

    @Override
    public void notify(final Intent intent) {
        final long sequence = BUFFER.next();
        final Event event = BUFFER.get(sequence);
        event.reset();
        event.intent = intent;
        BUFFER.publish(sequence);
    }

    /**
     * Event container for intent processing.
     */
    private static class Event {
        /**
         * Event factory fot new instance entries for filling the ring
         * buffer.
         */
        public static final EventFactory FACTORY =
                new EventFactory() {
                    public Event newInstance() {
                        return new Event();
                    }
                };
        /**
         * Intent to process.
         */
        private transient Intent intent;

        /**
         * Reset to empty state.
         */
        public void reset() {
            intent = null;
        }
    }

    /**
     * Event event handler for start activity thread event.
     */
    private static final class Handler
            implements com.lmax.disruptor.EventHandler {
        @Override
        public void onEvent(final Event event,
                            final long sequence,
                            final boolean endOfBatch) {
            final Intent intent = event.intent;
            final List infos = PACKAGES.resolveNotifier(intent);
            if (infos == null || infos.isEmpty()) {
                return;
            }

            for (final NotifierInfo info : infos) {
                final Class clazz = info.getClassName();
                try {
                    final Notifier notifier = clazz.newInstance();
                    notifier.notify(intent);
                } catch (InstantiationException | IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}