001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.cdi;
018
019import javax.enterprise.event.Event;
020import javax.inject.Inject;
021
022import org.apache.wicket.MetaDataKey;
023import org.apache.wicket.request.IRequestHandler;
024import org.apache.wicket.request.cycle.IRequestCycleListener;
025import org.apache.wicket.request.cycle.RequestCycle;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * Request cycle listener that fires the {@link DetachEvent} event
031 * 
032 * @author igor
033 * 
034 */
035public class DetachEventEmitter implements IRequestCycleListener
036{
037        private static final Logger logger = LoggerFactory.getLogger(DetachEventEmitter.class);
038
039        private static final MetaDataKey<Boolean> DETACH_SCHEDULED_KEY = new MetaDataKey<>()
040        {
041                private static final long serialVersionUID = 1L;
042        };
043
044        @Inject
045        Event<DetachEvent> detachEvent;
046
047        /**
048         * Constructor
049         */
050        public DetachEventEmitter()
051        {
052                NonContextual.of(DetachEventEmitter.class).postConstruct(this);
053        }
054
055        @Override
056        public void onRequestHandlerResolved(RequestCycle cycle, IRequestHandler handler)
057        {
058                // this is a wicket request, schedule detach event to be fired
059
060                cycle.setMetaData(DETACH_SCHEDULED_KEY, true);
061        }
062
063        @Override
064        public void onDetach(RequestCycle cycle)
065        {
066                if (Boolean.TRUE.equals(cycle.getMetaData(DETACH_SCHEDULED_KEY)))
067                {
068                        logger.debug("Firing Detach event {}", cycle.getRequest().getUrl());
069
070                        detachEvent.fire(new DetachEvent());
071
072                        cycle.setMetaData(DETACH_SCHEDULED_KEY, null);
073                }
074        }
075}