001/*
002 * (C) Copyright 2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 */
019
020package org.nuxeo.ecm.platform.video.listener;
021
022import static org.nuxeo.ecm.core.api.event.DocumentEventTypes.BEFORE_DOC_UPDATE;
023import static org.nuxeo.ecm.core.api.event.DocumentEventTypes.DOCUMENT_CREATED;
024import static org.nuxeo.ecm.platform.picture.api.ImagingDocumentConstants.PICTURE_VIEWS_PROPERTY;
025import static org.nuxeo.ecm.platform.video.VideoConstants.CTX_FORCE_INFORMATIONS_GENERATION;
026import static org.nuxeo.ecm.platform.video.VideoConstants.HAS_VIDEO_PREVIEW_FACET;
027import static org.nuxeo.ecm.platform.video.VideoConstants.STORYBOARD_PROPERTY;
028import static org.nuxeo.ecm.platform.video.VideoConstants.TRANSCODED_VIDEOS_PROPERTY;
029import static org.nuxeo.ecm.platform.video.VideoConstants.VIDEO_CHANGED_EVENT;
030
031import org.apache.commons.logging.Log;
032import org.apache.commons.logging.LogFactory;
033import org.nuxeo.ecm.core.api.Blob;
034import org.nuxeo.ecm.core.api.DocumentModel;
035import org.nuxeo.ecm.core.api.NuxeoException;
036import org.nuxeo.ecm.core.api.model.Property;
037import org.nuxeo.ecm.core.event.Event;
038import org.nuxeo.ecm.core.event.EventContext;
039import org.nuxeo.ecm.core.event.EventListener;
040import org.nuxeo.ecm.core.event.EventService;
041import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
042import org.nuxeo.ecm.platform.picture.api.ImagingDocumentConstants;
043import org.nuxeo.ecm.platform.video.VideoHelper;
044import org.nuxeo.runtime.api.Framework;
045
046/**
047 * Core event listener to trigger the {@link org.nuxeo.ecm.platform.video.VideoConstants#VIDEO_CHANGED_EVENT} event if
048 * the main video has changed. This is useful to update the video information, thumbnails and story board in a dedicated
049 * async event listener.
050 *
051 * @author ogrisel
052 * @since 5.5
053 */
054public class VideoChangedListener implements EventListener {
055
056    private static final Log log = LogFactory.getLog(VideoChangedListener.class);
057
058    @Override
059    public void handleEvent(Event event) {
060        EventContext ctx = event.getContext();
061        if (!(ctx instanceof DocumentEventContext)) {
062            return;
063        }
064        DocumentEventContext docCtx = (DocumentEventContext) ctx;
065        DocumentModel doc = docCtx.getSourceDocument();
066        if (doc.hasFacet(HAS_VIDEO_PREVIEW_FACET) && !doc.isProxy()) {
067            boolean forceGeneration = Boolean.TRUE.equals(doc.getContextData(CTX_FORCE_INFORMATIONS_GENERATION));
068            Property origVideoProperty = doc.getProperty("file:content");
069            if (forceGeneration || DOCUMENT_CREATED.equals(event.getName()) || origVideoProperty.isDirty()) {
070
071                Blob video = (Blob) origVideoProperty.getValue();
072                updateVideoInfo(doc, video);
073
074                if (BEFORE_DOC_UPDATE.equals(event.getName())) {
075                    doc.setPropertyValue(TRANSCODED_VIDEOS_PROPERTY, null);
076                    doc.setPropertyValue(STORYBOARD_PROPERTY, null);
077                    doc.setPropertyValue(PICTURE_VIEWS_PROPERTY, null);
078                }
079
080                // only trigger the event if we really have a video
081                if (video != null) {
082                    Event trigger = docCtx.newEvent(VIDEO_CHANGED_EVENT);
083                    EventService eventService = Framework.getLocalService(EventService.class);
084                    eventService.fireEvent(trigger);
085                }
086            }
087        }
088    }
089
090    protected void updateVideoInfo(DocumentModel doc, Blob video) {
091        try {
092            VideoHelper.updateVideoInfo(doc, video);
093        } catch (NuxeoException e) {
094            // may happen if ffmpeg is not installed
095            log.error(String.format("Unable to retrieve video info: %s", e.getMessage()));
096            log.debug(e, e);
097        }
098    }
099
100}