1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activemq.broker;
19
20 import EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap;
21
22 import javax.jms.JMSException;
23 import java.util.Map;
24
25 /***
26 * A cache of all the brokers and broker connectors in use which is usually used
27 * in a singleton way but could be used in an IoC style manner.
28 *
29 * @version $Revision: 1.4 $
30 */
31 public class BrokerContext {
32
33 private static final BrokerContext singleton = new BrokerContext();
34
35 private Map brokersByName = new ConcurrentHashMap();
36 private Map connectorsByURL = new ConcurrentHashMap();
37
38 public static BrokerContext getInstance() {
39 return singleton;
40 }
41
42
43 public synchronized BrokerContainer getBrokerContainerByName(String name, BrokerContainerFactory factory) throws JMSException {
44 BrokerContainer container = (BrokerContainer) brokersByName.get(name);
45 if (container == null) {
46
47 container = factory.createBrokerContainer(name, this);
48
49 assert brokersByName.get(name) == container : "Should have registered the container by now";
50
51 container.start();
52 }
53 return container;
54 }
55
56 public void registerContainer(String name, BrokerContainer container) {
57 if (name == null) {
58 throw new IllegalArgumentException("Name must not be null");
59 }
60 brokersByName.put(name, container);
61 }
62
63 public void deregisterContainer(String name, BrokerContainer container) {
64 brokersByName.remove(name);
65 }
66
67 public void registerConnector(String url, BrokerConnector connector) {
68 connectorsByURL.put(url, connector);
69 }
70
71 public void deregisterConnector(String urlString) {
72 connectorsByURL.remove(urlString);
73 }
74
75 public BrokerConnector getConnectorByURL(String url) {
76 BrokerConnector brokerConnector = (BrokerConnector) connectorsByURL.get(url);
77 if (brokerConnector == null) {
78 if (url.startsWith("reliable:")) {
79 return getConnectorByURL(url.substring("reliable:".length()));
80 }
81 else if (url.startsWith("list:")) {
82 return getConnectorByURL(url.substring("list:".length()));
83 }
84 }
85 return brokerConnector;
86 }
87 }