Revision 4710
Added by daigle over 15 years ago
| src/edu/ucsb/nceas/metacat/service/ServiceService.java | ||
|---|---|---|
| 1 | 1 |
/** |
| 2 | 2 |
* '$RCSfile$' |
| 3 |
* Purpose: A Class that implements session utility methods
|
|
| 3 |
* Purpose: A Class that controls other services
|
|
| 4 | 4 |
* Copyright: 2008 Regents of the University of California and the |
| 5 | 5 |
* National Center for Ecological Analysis and Synthesis |
| 6 | 6 |
* Authors: Michael Daigle |
| ... | ... | |
| 27 | 27 |
package edu.ucsb.nceas.metacat.service; |
| 28 | 28 |
|
| 29 | 29 |
import java.util.Hashtable; |
| 30 |
import java.util.Vector; |
|
| 31 | 30 |
|
| 31 |
import javax.servlet.ServletContext; |
|
| 32 |
|
|
| 32 | 33 |
import org.apache.log4j.Logger; |
| 33 | 34 |
|
| 34 |
import edu.ucsb.nceas.metacat.util.SessionData; |
|
| 35 |
|
|
| 36 |
public class ServiceService extends BaseService {
|
|
| 35 |
public class ServiceService {
|
|
| 37 | 36 |
|
| 38 | 37 |
private static ServiceService serviceService = null; |
| 39 | 38 |
|
| 39 |
private static final String CONFIG_DIR = "WEB-INF"; |
|
| 40 |
private static String REAL_CONFIG_DIR = ""; |
|
| 41 |
|
|
| 42 |
private static final String SKIN_DIR = "/style/skins"; |
|
| 43 |
private static String REAL_SKIN_DIR = ""; |
|
| 44 |
|
|
| 40 | 45 |
private static Logger logMetacat = Logger.getLogger(ServiceService.class); |
| 41 |
private static Hashtable<String, Class> ServiceList = null;
|
|
| 42 |
|
|
| 46 |
private static Hashtable<String, BaseService> serviceList = new Hashtable<String, BaseService>();
|
|
| 47 |
|
|
| 43 | 48 |
/** |
| 44 | 49 |
* private constructor since this is a singleton |
| 45 | 50 |
*/ |
| 46 |
private ServiceService() {
|
|
| 47 |
|
|
| 51 |
private ServiceService(ServletContext servletContext) {
|
|
| 52 |
REAL_CONFIG_DIR = servletContext.getRealPath(CONFIG_DIR); |
|
| 53 |
REAL_SKIN_DIR = servletContext.getRealPath(SKIN_DIR); |
|
| 48 | 54 |
} |
| 49 | 55 |
|
| 50 | 56 |
/** |
| ... | ... | |
| 52 | 58 |
* |
| 53 | 59 |
* @return the single instance of ServiceService |
| 54 | 60 |
*/ |
| 55 |
public static ServiceService getInstance() {
|
|
| 61 |
public static ServiceService getInstance(ServletContext servletContext) {
|
|
| 56 | 62 |
if (serviceService == null) {
|
| 57 |
serviceService = new ServiceService(); |
|
| 63 |
serviceService = new ServiceService(servletContext);
|
|
| 58 | 64 |
} |
| 59 | 65 |
return serviceService; |
| 60 | 66 |
} |
| 61 | 67 |
|
| 62 |
public boolean refreshable() {
|
|
| 63 |
return false; |
|
| 68 |
/** |
|
| 69 |
* Register a service with the system. |
|
| 70 |
* |
|
| 71 |
* @param serviceName |
|
| 72 |
* the name of the service |
|
| 73 |
* @param service |
|
| 74 |
* the singleton instance of the service |
|
| 75 |
*/ |
|
| 76 |
public static void registerService(String serviceName, BaseService service) |
|
| 77 |
throws ServiceException {
|
|
| 78 |
if (serviceList.containsKey(serviceName)) {
|
|
| 79 |
throw new ServiceException("Service: " + serviceName + " is already registered."
|
|
| 80 |
+ " Use ServiceService.reregister() to replace the service."); |
|
| 81 |
} |
|
| 82 |
logMetacat.info("Registering Service: " + serviceName);
|
|
| 83 |
serviceList.put(serviceName, service); |
|
| 64 | 84 |
} |
| 65 | 85 |
|
| 66 |
protected void doRefresh() {
|
|
| 67 |
return; |
|
| 86 |
/** |
|
| 87 |
* Refresh a service. |
|
| 88 |
* |
|
| 89 |
* @param serviceName |
|
| 90 |
* the name of the service to refresh |
|
| 91 |
*/ |
|
| 92 |
public static void refreshService(String serviceName) |
|
| 93 |
throws ServiceException {
|
|
| 94 |
if (!serviceList.containsKey(serviceName)) {
|
|
| 95 |
throw new ServiceException("Service: " + serviceName + " is not registered.");
|
|
| 96 |
} |
|
| 97 |
|
|
| 98 |
BaseService baseService = serviceList.get(serviceName); |
|
| 99 |
if (!baseService.refreshable()) {
|
|
| 100 |
throw new ServiceException("Service: " + serviceName + " is not refreshable.");
|
|
| 101 |
} |
|
| 102 |
logMetacat.info("Refreshing Service: " + serviceName);
|
|
| 103 |
baseService.refresh(); |
|
| 68 | 104 |
} |
| 69 | 105 |
|
| 70 |
|
|
| 106 |
/** |
|
| 107 |
* Convert the relative config directory to a full path |
|
| 108 |
* @return the full config path |
|
| 109 |
*/ |
|
| 110 |
public static String getRealConfigDir() throws ServiceException {
|
|
| 111 |
if (serviceService == null) {
|
|
| 112 |
throw new ServiceException("Cannot access config dir before Service has been initialized");
|
|
| 113 |
} |
|
| 114 |
return REAL_CONFIG_DIR; |
|
| 115 |
} |
|
| 116 |
|
|
| 117 |
/** |
|
| 118 |
* Convert the relative skins directory to a full path |
|
| 119 |
* @return the full skins directory path |
|
| 120 |
*/ |
|
| 121 |
public static String getRealSkinDir() throws ServiceException {
|
|
| 122 |
if (serviceService == null) {
|
|
| 123 |
throw new ServiceException("Cannot access skin dir before Service has been initialized");
|
|
| 124 |
} |
|
| 125 |
return REAL_SKIN_DIR; |
|
| 126 |
} |
|
| 127 |
|
|
| 71 | 128 |
} |
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.