Revision 4710
Added by daigle almost 16 years ago
| src/edu/ucsb/nceas/metacat/service/ServiceService.java | ||
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/** |
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* '$RCSfile$' |
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* Purpose: A Class that implements session utility methods
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* Purpose: A Class that controls other services
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* Copyright: 2008 Regents of the University of California and the |
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* National Center for Ecological Analysis and Synthesis |
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* Authors: Michael Daigle |
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package edu.ucsb.nceas.metacat.service; |
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import java.util.Hashtable; |
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import java.util.Vector; |
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import javax.servlet.ServletContext; |
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import org.apache.log4j.Logger; |
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import edu.ucsb.nceas.metacat.util.SessionData; |
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public class ServiceService extends BaseService {
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public class ServiceService {
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private static ServiceService serviceService = null; |
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private static final String CONFIG_DIR = "WEB-INF"; |
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private static String REAL_CONFIG_DIR = ""; |
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private static final String SKIN_DIR = "/style/skins"; |
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private static String REAL_SKIN_DIR = ""; |
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private static Logger logMetacat = Logger.getLogger(ServiceService.class); |
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private static Hashtable<String, Class> ServiceList = null;
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private static Hashtable<String, BaseService> serviceList = new Hashtable<String, BaseService>();
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/** |
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* private constructor since this is a singleton |
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*/ |
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private ServiceService() {
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private ServiceService(ServletContext servletContext) {
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REAL_CONFIG_DIR = servletContext.getRealPath(CONFIG_DIR); |
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REAL_SKIN_DIR = servletContext.getRealPath(SKIN_DIR); |
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} |
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/** |
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* |
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* @return the single instance of ServiceService |
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*/ |
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public static ServiceService getInstance() {
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public static ServiceService getInstance(ServletContext servletContext) {
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if (serviceService == null) {
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serviceService = new ServiceService(); |
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serviceService = new ServiceService(servletContext);
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} |
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return serviceService; |
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} |
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public boolean refreshable() {
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return false; |
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/** |
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* Register a service with the system. |
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* |
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* @param serviceName |
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* the name of the service |
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* @param service |
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* the singleton instance of the service |
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*/ |
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public static void registerService(String serviceName, BaseService service) |
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throws ServiceException {
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if (serviceList.containsKey(serviceName)) {
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throw new ServiceException("Service: " + serviceName + " is already registered."
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+ " Use ServiceService.reregister() to replace the service."); |
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} |
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logMetacat.info("Registering Service: " + serviceName);
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serviceList.put(serviceName, service); |
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} |
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protected void doRefresh() {
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return; |
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/** |
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* Refresh a service. |
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* |
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* @param serviceName |
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* the name of the service to refresh |
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*/ |
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public static void refreshService(String serviceName) |
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throws ServiceException {
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if (!serviceList.containsKey(serviceName)) {
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throw new ServiceException("Service: " + serviceName + " is not registered.");
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} |
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BaseService baseService = serviceList.get(serviceName); |
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if (!baseService.refreshable()) {
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throw new ServiceException("Service: " + serviceName + " is not refreshable.");
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} |
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logMetacat.info("Refreshing Service: " + serviceName);
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baseService.refresh(); |
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} |
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/** |
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* Convert the relative config directory to a full path |
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* @return the full config path |
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*/ |
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public static String getRealConfigDir() throws ServiceException {
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if (serviceService == null) {
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throw new ServiceException("Cannot access config dir before Service has been initialized");
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} |
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return REAL_CONFIG_DIR; |
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} |
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/** |
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* Convert the relative skins directory to a full path |
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* @return the full skins directory path |
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*/ |
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public static String getRealSkinDir() throws ServiceException {
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if (serviceService == null) {
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throw new ServiceException("Cannot access skin dir before Service has been initialized");
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} |
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return REAL_SKIN_DIR; |
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} |
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} |
Also available in: Unified diff
This service now holds a registry of active services. Refreshing of services must go through this class. Also holds some common values that are discovered via servlet context.