1 package org.apache.fulcrum.yaafi.service.servicemanager;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.avalon.framework.activity.Disposable;
23 import org.apache.avalon.framework.context.Context;
24 import org.apache.avalon.framework.context.ContextException;
25 import org.apache.avalon.framework.context.Contextualizable;
26 import org.apache.avalon.framework.context.DefaultContext;
27 import org.apache.avalon.framework.logger.AbstractLogEnabled;
28 import org.apache.avalon.framework.logger.Logger;
29 import org.apache.avalon.framework.parameters.ParameterException;
30 import org.apache.avalon.framework.parameters.Parameterizable;
31 import org.apache.avalon.framework.parameters.Parameters;
32 import org.apache.avalon.framework.service.ServiceException;
33 import org.apache.avalon.framework.service.ServiceManager;
34 import org.apache.avalon.framework.service.Serviceable;
35
36
37 /**
38 * This is a sort of "edelhack" to solve the problem of accessing
39 * the Avalon infrastructure without having an instance of the
40 * container. The implementation stores the very first instance
41 * of itself in a static variable which can be accessed using
42 * getInstance().
43 *
44 * This allows access to the various Avalon artifacts.
45 *
46 * @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a>
47 */
48
49 public class ServiceManagerServiceImpl
50 extends AbstractLogEnabled
51 implements ServiceManagerService, Contextualizable, Parameterizable, Serviceable, Disposable
52 {
53 /** The one and only instance */
54 private static ServiceManagerServiceImpl instance;
55
56 /** Store the ServiceContainer on a per instance base */
57 private ServiceManager serviceManager;
58
59 /** Store the passed parameters on a per instance base */
60 private Parameters parameters;
61
62 /** Store the passed parameters on a per instance base */
63 private Context context;
64
65 /**
66 * Constructor
67 */
68 public ServiceManagerServiceImpl()
69 {
70 setInstance(this);
71 }
72
73 /**
74 * @return the one and only instance of this class
75 */
76 public static synchronized ServiceManagerService getInstance()
77 {
78 return instance;
79 }
80
81 /**
82 * Create the one and only instance
83 * @param instance the instance
84 */
85 protected static synchronized void setInstance( ServiceManagerServiceImpl instance )
86 {
87 if( ServiceManagerServiceImpl.instance == null )
88 {
89 ServiceManagerServiceImpl.instance = instance;
90 }
91 }
92
93 /////////////////////////////////////////////////////////////////////////
94 // Avalon Lifecycle Implementation
95 /////////////////////////////////////////////////////////////////////////
96
97 /**
98 * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager)
99 */
100 public void service(ServiceManager serviceManager) throws ServiceException
101 {
102 this.serviceManager = serviceManager;
103 }
104
105 /**
106 * @see org.apache.avalon.framework.context.Contextualizable#contextualize(org.apache.avalon.framework.context.Context)
107 */
108 public void contextualize(Context context) throws ContextException
109 {
110 this.context = context;
111 }
112
113 /**
114 * @see org.apache.avalon.framework.parameters.Parameterizable#parameterize(org.apache.avalon.framework.parameters.Parameters)
115 */
116 public void parameterize(Parameters parameters) throws ParameterException
117 {
118 this.parameters = parameters;
119 }
120
121 /**
122 * @see org.apache.avalon.framework.activity.Disposable#dispose()
123 */
124 public void dispose()
125 {
126 this.serviceManager = null;
127 this.parameters = new Parameters();
128 this.context = new DefaultContext();
129 ServiceManagerServiceImpl.instance = null;
130 }
131
132 /////////////////////////////////////////////////////////////////////////
133 // ServiceContainer Implementation
134 /////////////////////////////////////////////////////////////////////////
135
136 /**
137 * @see org.apache.avalon.framework.service.ServiceManager#hasService(java.lang.String)
138 */
139 public boolean hasService(String name)
140 {
141 return this.serviceManager.hasService(name);
142 }
143
144 /**
145 * @see org.apache.avalon.framework.service.ServiceManager#lookup(java.lang.String)
146 */
147 public Object lookup(String name) throws ServiceException
148 {
149 return this.serviceManager.lookup(name);
150 }
151
152 /**
153 * @see org.apache.avalon.framework.service.ServiceManager#release(java.lang.Object)
154 */
155 public void release(Object object)
156 {
157 this.serviceManager.release(object);
158 }
159
160 /**
161 * @return the ServiceManager for the container
162 */
163 public ServiceManager getServiceManager()
164 {
165 return this.serviceManager;
166 }
167
168 /**
169 * @return the Parameters for the container
170 */
171 public Parameters getParameters()
172 {
173 return this.parameters;
174 }
175
176 /**
177 * @return the Context for the container
178 */
179 public Context getContext()
180 {
181 return this.context;
182 }
183
184 /**
185 * @see org.apache.fulcrum.yaafi.service.servicemanager.ServiceManagerService#getAvalonLogger()
186 */
187 public Logger getAvalonLogger()
188 {
189 return this.getLogger();
190 }
191 }