1 /**
2 *
3 * Copyright 2003-2004 The Apache Software Foundation
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.apache.geronimo.gbean.runtime;
19
20 import org.apache.commons.logging.Log;
21 import org.apache.commons.logging.LogFactory;
22 import org.apache.geronimo.gbean.AbstractName;
23 import org.apache.geronimo.gbean.GReferenceInfo;
24 import org.apache.geronimo.gbean.InvalidConfigurationException;
25 import org.apache.geronimo.gbean.ReferencePatterns;
26 import org.apache.geronimo.kernel.Kernel;
27 import org.apache.geronimo.kernel.GBeanNotFoundException;
28
29 /**
30 * @version $Rev: 430508 $ $Date: 2006-08-10 12:56:47 -0700 (Thu, 10 Aug 2006) $
31 */
32 public class GBeanSingleReference extends AbstractGBeanReference {
33 private static final Log log = LogFactory.getLog(GBeanSingleReference.class);
34
35 /**
36 * The object to which the proxy is bound
37 */
38 private final AbstractName targetName;
39
40 public GBeanSingleReference(GBeanInstance gbeanInstance, GReferenceInfo referenceInfo, Kernel kernel, ReferencePatterns referencePatterns) throws InvalidConfigurationException {
41 super(gbeanInstance, referenceInfo, kernel, referencePatterns != null && referencePatterns.getAbstractName() != null);
42 targetName = referencePatterns != null? referencePatterns.getAbstractName(): null;
43 }
44
45 public AbstractName getTargetName() {
46 return targetName;
47 }
48
49 public final synchronized void online() {
50 }
51
52 public final synchronized void offline() {
53 stop();
54 }
55
56
57 public synchronized boolean start() {
58
59 if (targetName == null) {
60 return true;
61 }
62
63
64 AbstractName abstractName = getGBeanInstance().getAbstractName();
65 if (!isRunning(getKernel(), targetName)) {
66 log.debug("Waiting to start " + abstractName + " because no targets are running for reference " + getName() +" matching the patterns " + targetName);
67 return false;
68 }
69
70 if (getProxy() != null) {
71 return true;
72 }
73
74 if (NO_PROXY) {
75 try {
76 setProxy(getKernel().getGBean(targetName));
77 } catch (GBeanNotFoundException e) {
78
79 log.debug("Waiting to start " + abstractName + " because no targets are running for reference " + getName() +" matching the patterns " + targetName);
80 }
81 } else {
82 setProxy(getKernel().getProxyManager().createProxy(targetName, getReferenceType()));
83 }
84
85 return true;
86 }
87
88 public synchronized void stop() {
89 Object proxy = getProxy();
90 if (proxy != null) {
91 getKernel().getProxyManager().destroyProxy(proxy);
92 setProxy(null);
93 }
94 }
95
96
97 }