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/**
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* '$RCSfile$'
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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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*
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* '$Author: daigle $'
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* '$Date: 2008-10-09 09:53:18 -0700 (Thu, 09 Oct 2008) $'
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* '$Revision: 4429 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.service;
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import java.util.Hashtable;
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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.SystemUtil;
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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 String REAL_APPLICATION_CONTEXT = null;
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private static Logger logMetacat = Logger.getLogger(ServiceService.class);
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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(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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REAL_APPLICATION_CONTEXT = SystemUtil.discoverApplicationContext(servletContext);
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}
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/**
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* Get the single instance of ServiceService.
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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(ServletContext servletContext) {
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if (serviceService == null) {
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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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/**
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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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/**
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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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/**
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* Get the servlet context name
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* @return a string holding the context name
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*/
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public static String getRealApplicationContext() throws ServiceException {
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if (REAL_APPLICATION_CONTEXT == null) {
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throw new ServiceException("Application context name is null");
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}
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return REAL_APPLICATION_CONTEXT;
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}
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}
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