001/*
002 * (C) Copyright 2010 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 */
017
018package org.nuxeo.ecm.platform.video.listener;
019
020import static org.nuxeo.ecm.core.api.event.DocumentEventTypes.BEFORE_DOC_UPDATE;
021import static org.nuxeo.ecm.core.api.event.DocumentEventTypes.DOCUMENT_CREATED;
022import static org.nuxeo.ecm.platform.picture.api.ImagingDocumentConstants.PICTURE_VIEWS_PROPERTY;
023import static org.nuxeo.ecm.platform.video.VideoConstants.CTX_FORCE_INFORMATIONS_GENERATION;
024import static org.nuxeo.ecm.platform.video.VideoConstants.HAS_VIDEO_PREVIEW_FACET;
025import static org.nuxeo.ecm.platform.video.VideoConstants.STORYBOARD_PROPERTY;
026import static org.nuxeo.ecm.platform.video.VideoConstants.TRANSCODED_VIDEOS_PROPERTY;
027import static org.nuxeo.ecm.platform.video.VideoConstants.VIDEO_CHANGED_EVENT;
028
029import org.apache.commons.logging.Log;
030import org.apache.commons.logging.LogFactory;
031import org.nuxeo.ecm.core.api.Blob;
032import org.nuxeo.ecm.core.api.DocumentModel;
033import org.nuxeo.ecm.core.api.NuxeoException;
034import org.nuxeo.ecm.core.api.model.Property;
035import org.nuxeo.ecm.core.event.Event;
036import org.nuxeo.ecm.core.event.EventContext;
037import org.nuxeo.ecm.core.event.EventListener;
038import org.nuxeo.ecm.core.event.EventService;
039import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
040import org.nuxeo.ecm.platform.picture.api.ImagingDocumentConstants;
041import org.nuxeo.ecm.platform.video.VideoHelper;
042import org.nuxeo.runtime.api.Framework;
043
044/**
045 * Core event listener to trigger the {@link org.nuxeo.ecm.platform.video.VideoConstants#VIDEO_CHANGED_EVENT} event if
046 * the main video has changed. This is useful to update the video information, thumbnails and story board in a dedicated
047 * async event listener.
048 *
049 * @author ogrisel
050 * @since 5.5
051 */
052public class VideoChangedListener implements EventListener {
053
054    private static final Log log = LogFactory.getLog(VideoChangedListener.class);
055
056    @Override
057    public void handleEvent(Event event) {
058        EventContext ctx = event.getContext();
059        if (!(ctx instanceof DocumentEventContext)) {
060            return;
061        }
062        DocumentEventContext docCtx = (DocumentEventContext) ctx;
063        DocumentModel doc = docCtx.getSourceDocument();
064        if (doc.hasFacet(HAS_VIDEO_PREVIEW_FACET) && !doc.isProxy()) {
065            boolean forceGeneration = Boolean.TRUE.equals(doc.getContextData(CTX_FORCE_INFORMATIONS_GENERATION));
066            Property origVideoProperty = doc.getProperty("file:content");
067            if (forceGeneration || DOCUMENT_CREATED.equals(event.getName()) || origVideoProperty.isDirty()) {
068
069                Blob video = (Blob) origVideoProperty.getValue();
070                updateVideoInfo(doc, video);
071
072                if (BEFORE_DOC_UPDATE.equals(event.getName())) {
073                    doc.setPropertyValue(TRANSCODED_VIDEOS_PROPERTY, null);
074                    doc.setPropertyValue(STORYBOARD_PROPERTY, null);
075                    doc.setPropertyValue(PICTURE_VIEWS_PROPERTY, null);
076                }
077
078                // only trigger the event if we really have a video
079                if (video != null) {
080                    Event trigger = docCtx.newEvent(VIDEO_CHANGED_EVENT);
081                    EventService eventService = Framework.getLocalService(EventService.class);
082                    eventService.fireEvent(trigger);
083                }
084            }
085        }
086    }
087
088    protected void updateVideoInfo(DocumentModel doc, Blob video) {
089        try {
090            VideoHelper.updateVideoInfo(doc, video);
091        } catch (NuxeoException e) {
092            // may happen if ffmpeg is not installed
093            log.error(String.format("Unable to retrieve video info: %s", e.getMessage()));
094            log.debug(e, e);
095        }
096    }
097
098}