001/*
002 * (C) Copyright 2006-2011 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 *     Bogdan Stefanescu
018 *     Florent Guillaume
019 */
020package org.nuxeo.ecm.core.event;
021
022import org.nuxeo.ecm.core.event.impl.EventListenerDescriptor;
023import org.nuxeo.ecm.core.event.impl.EventServiceImpl;
024import org.nuxeo.runtime.api.Framework;
025import org.nuxeo.runtime.model.ComponentContext;
026import org.nuxeo.runtime.model.ComponentInstance;
027import org.nuxeo.runtime.model.DefaultComponent;
028
029/**
030 * Event Service Component, allowing registration of contributions and doing the event service shutdown upon
031 * deactivation.
032 */
033public class EventServiceComponent extends DefaultComponent {
034
035    public static final int APPLICATION_STARTED_ORDER = -500;
036
037    public static final String EVENT_LISTENER_XP = "listener";
038
039    public static final long DEFAULT_SHUTDOWN_TIMEOUT = 5 * 1000; // 5 seconds
040
041    protected EventServiceImpl service;
042
043    @Override
044    public void activate(ComponentContext context) {
045        service = new EventServiceImpl();
046    }
047
048    @Override
049    public void deactivate(ComponentContext context) {
050        if (service != null) {
051            String s = Framework.getProperty("org.nuxeo.ecm.core.event.shutdown.timeoutMillis");
052            long timeout = s == null ? DEFAULT_SHUTDOWN_TIMEOUT : Long.parseLong(s);
053            try {
054                service.shutdown(timeout);
055            } catch (InterruptedException e) {
056                // restore interrupted status
057                Thread.currentThread().interrupt();
058                throw new RuntimeException(e);
059            }
060            service = null;
061        }
062    }
063
064    @Override
065    public int getApplicationStartedOrder() {
066        return APPLICATION_STARTED_ORDER;
067    }
068
069    @Override
070    public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
071        if (EVENT_LISTENER_XP.equals(extensionPoint)) {
072            EventListenerDescriptor descriptor = (EventListenerDescriptor) contribution;
073            descriptor.setRuntimeContext(contributor.getRuntimeContext());
074            service.addEventListener(descriptor);
075        }
076    }
077
078    @Override
079    public void unregisterContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
080        if (EVENT_LISTENER_XP.equals(extensionPoint)) {
081            service.removeEventListener((EventListenerDescriptor) contribution);
082        }
083    }
084
085    @SuppressWarnings("unchecked")
086    @Override
087    public <T> T getAdapter(Class<T> adapter) {
088        if (EventService.class == adapter || EventProducer.class == adapter || EventServiceAdmin.class == adapter) {
089            return (T) service;
090        }
091        return null;
092    }
093
094}