Source Code Cross Referenced for ACSYaafiComponentService.java in  » Web-Framework » TURBINE » org » apache » turbine » services » avaloncomponent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » TURBINE » org.apache.turbine.services.avaloncomponent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.turbine.services.avaloncomponent;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        import java.io.File;
023:        import java.io.IOException;
024:
025:        import org.apache.avalon.framework.activity.Disposable;
026:        import org.apache.avalon.framework.activity.Initializable;
027:        import org.apache.avalon.framework.component.Component;
028:        import org.apache.avalon.framework.component.ComponentException;
029:        import org.apache.avalon.framework.logger.Log4JLogger;
030:        import org.apache.avalon.framework.service.ServiceException;
031:        import org.apache.commons.configuration.Configuration;
032:        import org.apache.fulcrum.yaafi.framework.container.ServiceContainer;
033:        import org.apache.fulcrum.yaafi.framework.factory.ServiceContainerConfiguration;
034:        import org.apache.fulcrum.yaafi.framework.factory.ServiceContainerFactory;
035:        import org.apache.log4j.Logger;
036:        import org.apache.turbine.Turbine;
037:        import org.apache.turbine.services.InitializationException;
038:        import org.apache.turbine.services.TurbineBaseService;
039:
040:        /**
041:         * An implementation of Turbine service initializing the YAAFI container
042:         *
043:         * @author <a href="mailto:siegfried.goescfl@it20one.at">Siegfried Goeschl</a>
044:         * @author <a href="mailto:tv@apache.org">Thomas Vandahl</a>
045:         * @version $Id$
046:         */
047:        public class ACSYaafiComponentService extends TurbineBaseService
048:                implements  AvalonComponentService, Initializable, Disposable {
049:            /** The publically visible name of the service */
050:            public static final String SERVICE_NAME = "YaafiComponentService";
051:
052:            /** property to lookup the container configuration file */
053:            public static final String CONTAINER_CONFIGURATION_KEY = "containerConfiguration";
054:
055:            /** the default value for the container configuration file */
056:            public static final String CONTAINER_CONFIGURATION_VALUE = "/WEB-INF/conf/containerConfiguration.xml";
057:
058:            /** property to lookup the properties file */
059:            public static final String COMPONENT_PARAMETERS_KEY = "parameters";
060:
061:            /** the default value for the parameter file */
062:            public static final String COMPONENT_PARAMETERS_VALUE = "/WEB-INF/conf/parameters.properties";
063:
064:            /** YAFFI container */
065:            private ServiceContainer container;
066:
067:            /** our Log4J logger */
068:            private Logger logger;
069:
070:            // -------------------------------------------------------------
071:            // Service initialization
072:            // -------------------------------------------------------------
073:
074:            public ACSYaafiComponentService() {
075:                this .logger = Logger.getLogger(ACSYaafiComponentService.class);
076:            }
077:
078:            /**
079:             * Load all configured components and initialize them. This is a zero
080:             * parameter variant which queries the Turbine Servlet for its config.
081:             *
082:             * @throws InitializationException Something went wrong in the init stage
083:             */
084:            public void init() throws InitializationException {
085:                try {
086:                    this .logger
087:                            .info("Initializing ACSYaafiComponentService ...");
088:                    initialize();
089:                    setInit(true);
090:                } catch (Exception e) {
091:                    this .logger.error(
092:                            "Exception caught initializing service: ", e);
093:                    throw new InitializationException(
094:                            "Initializing ACSYaafiComponentService failed", e);
095:                }
096:            }
097:
098:            /**
099:             * Shuts the Component Service down, calls dispose on the components that
100:             * implement this interface
101:             */
102:            public void shutdown() {
103:                this .logger.info("Disposing ACSYaafiComponentService ...");
104:                dispose();
105:                setInit(false);
106:            }
107:
108:            // -------------------------------------------------------------
109:            // Avalon lifecycle interfaces
110:            // -------------------------------------------------------------
111:
112:            /**
113:             * Initializes the container
114:             *
115:             * @throws Exception generic exception
116:             */
117:            public void initialize() throws Exception {
118:                // get the configuration from the base class
119:                Configuration conf = this .getConfiguration();
120:
121:                // determine the home directory
122:                String homePath = Turbine.getRealPath("/");
123:                if (homePath == null) {
124:                    homePath = Turbine.getApplicationRoot();
125:                }
126:                File home = new File(homePath);
127:
128:                this .logger.info("Using the following home : "
129:                        + home.getAbsolutePath());
130:
131:                // create the configuration for YAAFI
132:                ServiceContainerConfiguration config = this 
133:                        .createServiceContainerConfiguration(conf, home
134:                                .getAbsolutePath());
135:
136:                try {
137:                    this .container = ServiceContainerFactory.create(config);
138:                } catch (Throwable t) {
139:                    throw new Exception("Initializing YAAFI failed", t);
140:                }
141:            }
142:
143:            /**
144:             * Disposes of the container and releases resources
145:             */
146:            public void dispose() {
147:                if (this .container != null) {
148:                    this .container.dispose();
149:                    this .container = null;
150:                }
151:            }
152:
153:            /**
154:             * Returns an instance of the named component
155:             *
156:             * @param path Name of the role the component fills.
157:             * @return an instance of the named component
158:             * @throws Exception generic exception
159:             */
160:            public Component lookup(String path) throws ComponentException {
161:                try {
162:                    return (Component) this .container.lookup(path);
163:                } catch (ServiceException e) {
164:                    throw new ComponentException(e.getKey(), e.getMessage(), e);
165:                }
166:            }
167:
168:            /**
169:             * Releases the component
170:             *
171:             * @param component the component to release
172:             */
173:            public void release(Component component) {
174:                this .container.release(component);
175:            }
176:
177:            /**
178:             * Create a ServiceContainerConfiguration based on the Turbine configuration
179:             *
180:             * @param conf the Turbine configuration
181:             * @param appRoot the absolute path to the application root directory
182:             * @return the YAAFI configuration
183:             * @throws IOException creating the YAAFI configuration failed
184:             */
185:            protected ServiceContainerConfiguration createServiceContainerConfiguration(
186:                    Configuration conf, String appRoot) throws IOException {
187:                ServiceContainerConfiguration result = new ServiceContainerConfiguration();
188:
189:                result.setLogger(this .createAvalonLogger(AVALON_LOG_CATEGORY));
190:                result.setApplicationRootDir(appRoot);
191:
192:                // are we using a "containerConfiguration.xml" ?!
193:
194:                if (conf.containsKey(CONTAINER_CONFIGURATION_KEY)) {
195:                    // determine the container configuration file
196:
197:                    String containerConfiguration = conf
198:                            .getString(CONTAINER_CONFIGURATION_KEY);
199:
200:                    result.loadContainerConfiguration(containerConfiguration);
201:                } else if (conf.containsKey(COMPONENT_ROLE_KEY)) {
202:                    // determine the location of the role configuration file
203:
204:                    String roleConfigurationFileName = conf.getString(
205:                            COMPONENT_ROLE_KEY, COMPONENT_ROLE_VALUE);
206:
207:                    // determine the location of component configuration file
208:
209:                    String componentConfigurationFileName = conf.getString(
210:                            COMPONENT_CONFIG_KEY, COMPONENT_CONFIG_VALUE);
211:
212:                    // determine the location of parameters file
213:
214:                    String parametersFileName = conf.getString(
215:                            COMPONENT_PARAMETERS_KEY,
216:                            COMPONENT_PARAMETERS_VALUE);
217:
218:                    result.setComponentRolesLocation(roleConfigurationFileName);
219:                    result
220:                            .setComponentConfigurationLocation(componentConfigurationFileName);
221:                    result.setParametersLocation(parametersFileName);
222:                } else {
223:                    // determine the container configuration file
224:
225:                    String containerConfiguration = conf.getString(
226:                            CONTAINER_CONFIGURATION_KEY,
227:                            CONTAINER_CONFIGURATION_VALUE);
228:
229:                    result.loadContainerConfiguration(containerConfiguration);
230:                }
231:
232:                return result;
233:            }
234:
235:            /**
236:             * Create the Avalon logger to be passed to YAAFI
237:             *
238:             * @param name the name of the logger
239:             * @return an Avalon Logger
240:             */
241:            protected org.apache.avalon.framework.logger.Logger createAvalonLogger(
242:                    String name) {
243:                return new Log4JLogger(Logger.getLogger(name));
244:            }
245:        }
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