001/*
002 * (C) Copyright 2006-2016 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 */
019package org.nuxeo.runtime.services.event;
020
021import java.util.Arrays;
022
023import org.apache.commons.logging.Log;
024import org.apache.commons.logging.LogFactory;
025import org.nuxeo.common.xmap.annotation.XNode;
026import org.nuxeo.common.xmap.annotation.XNodeList;
027import org.nuxeo.common.xmap.annotation.XObject;
028
029/**
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032@XObject("listener")
033public class ListenerDescriptor {
034
035    private static final EventListener NULL_LISTENER = event -> {};
036
037    private static final Log log = LogFactory.getLog(ListenerDescriptor.class);
038
039    @XNodeList(value = "topic", type = String[].class, componentType = String.class)
040    String[] topics;
041
042    EventListener listener;
043
044    @XNode("@class")
045    public void setListener(Class<EventListener> listenerClass) {
046        try {
047            listener = listenerClass.newInstance();
048        } catch (ReflectiveOperationException e) {
049            log.error(e);
050            listener = NULL_LISTENER;
051        }
052    }
053
054    @Override
055    public String toString() {
056        return listener + " { " + Arrays.toString(topics) + " }";
057    }
058
059}