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 */
017 package org.apache.camel.component.eventadmin;
018
019 import java.util.Dictionary;
020 import java.util.Hashtable;
021 import java.util.Map;
022
023 import org.apache.camel.CamelContext;
024 import org.apache.camel.CamelExchangeException;
025 import org.apache.camel.Exchange;
026 import org.apache.camel.Message;
027 import org.apache.camel.impl.DefaultProducer;
028 import org.apache.camel.util.CamelContextHelper;
029 import org.osgi.service.event.Event;
030 import org.osgi.service.event.EventAdmin;
031 import org.osgi.util.tracker.ServiceTracker;
032
033 /**
034 * EventAdmin producer
035 */
036 public class EventAdminProducer extends DefaultProducer {
037
038 private final EventAdminEndpoint endpoint;
039 private ServiceTracker tracker;
040
041 public EventAdminProducer(EventAdminEndpoint endpoint) {
042 super(endpoint);
043 this.endpoint = endpoint;
044 this.tracker = new ServiceTracker(endpoint.getComponent().getBundleContext(), EventAdmin.class.getName(), null);
045 }
046
047 @Override
048 protected void doStart() throws Exception {
049 super.doStart();
050 this.tracker.open();
051 }
052
053 @Override
054 protected void doStop() throws Exception {
055 this.tracker.close();
056 super.doStop();
057 }
058
059 public void process(Exchange exchange) throws Exception {
060 EventAdmin admin = (EventAdmin) this.tracker.getService();
061 if (admin != null) {
062 Event event = getEvent(exchange);
063 if (endpoint.isSend()) {
064 admin.sendEvent(event);
065 } else {
066 admin.postEvent(event);
067 }
068 } else {
069 throw new CamelExchangeException("EventAdmin service not present", exchange);
070 }
071 }
072
073 protected String getTopic(Exchange exchange) {
074 Message in = exchange.getIn();
075 String topic = in.getHeader(EventAdminConstants.EVENTADMIN_TOPIC, String.class);
076 if (topic != null) {
077 in.removeHeader(EventAdminConstants.EVENTADMIN_TOPIC);
078 }
079 if (topic == null) {
080 topic = endpoint.getTopic();
081 }
082 return topic;
083 }
084
085 protected Event getEvent(Exchange exchange) {
086 Message in = exchange.getIn();
087 CamelContext context = endpoint.getCamelContext();
088 Event event = context.getTypeConverter().convertTo(Event.class, exchange, in.getBody());
089 if (event == null) {
090 String topic = getTopic(exchange);
091 Dictionary props = getProperties(exchange);
092 event = new Event(topic, props);
093 }
094 return event;
095 }
096
097 protected Dictionary getProperties(Exchange exchange) {
098 Message in = exchange.getIn();
099 CamelContext context = endpoint.getCamelContext();
100 Map map = context.getTypeConverter().convertTo(Map.class, exchange, in.getBody());
101 Dictionary dict = new Hashtable();
102 for (Object key : map.keySet()) {
103 String keyString = CamelContextHelper.convertTo(context, String.class, key);
104 if (keyString != null) {
105 Object val = map.get(key);
106 // TODO: convert to acceptable value
107 dict.put(keyString, val);
108 }
109 }
110 return dict;
111 }
112
113 }