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.camel.component.event;
018
019import java.util.LinkedHashSet;
020import java.util.Map;
021import java.util.Set;
022
023import org.apache.camel.spi.annotations.Component;
024import org.apache.camel.support.DefaultComponent;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027import org.springframework.beans.BeansException;
028import org.springframework.context.ApplicationContext;
029import org.springframework.context.ApplicationContextAware;
030import org.springframework.context.ApplicationEvent;
031import org.springframework.context.ConfigurableApplicationContext;
032
033/**
034 * The <a href="http://camel.apache.org/event.html">Event Component</a> is for working with Spring ApplicationEvents.
035 */
036@Component("spring-event")
037public class EventComponent extends DefaultComponent implements ApplicationContextAware {
038    private static final Logger LOG = LoggerFactory.getLogger(EventComponent.class);
039    private ApplicationContext applicationContext;
040    private final Set<EventEndpoint> endpoints = new LinkedHashSet<>();
041
042    public EventComponent() {
043    }
044
045    public EventComponent(ApplicationContext applicationContext) {
046        super();
047        setApplicationContext(applicationContext);
048    }
049
050    public ApplicationContext getApplicationContext() {
051        return applicationContext;
052    }
053
054    /**
055     * The Spring ApplicationContext
056     */
057    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
058        this.applicationContext = applicationContext;
059    }
060
061    public ConfigurableApplicationContext getConfigurableApplicationContext() {
062        ApplicationContext applicationContext = getApplicationContext();
063        if (applicationContext instanceof ConfigurableApplicationContext) {
064            return (ConfigurableApplicationContext)applicationContext;
065        } else {
066            throw new IllegalArgumentException("Class: " + applicationContext.getClass().getName() + " is not an instanceof ConfigurableApplicationContext.");
067        }
068    }
069
070    protected EventEndpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
071        EventEndpoint answer = new EventEndpoint(uri, this, remaining);
072        setProperties(answer, parameters);
073        return answer;
074    }
075
076    protected void consumerStarted(EventEndpoint endpoint) {
077        endpoints.add(endpoint);
078    }
079
080    protected void consumerStopped(EventEndpoint endpoint) {
081        endpoints.remove(endpoint);
082    }
083
084    public void onApplicationEvent(ApplicationEvent event) {
085        // broadcast to the endpoints in use
086        for (EventEndpoint endpoint : endpoints) {
087            try {
088                endpoint.onApplicationEvent(event);
089            } catch (Exception e) {
090                LOG.warn("Error on application event " + event + ". This exception will be ignored.", e);
091            }
092        }
093    }
094
095    @Override
096    protected void doStop() throws Exception {
097        endpoints.clear();
098        super.doStop();
099    }
100}