net.anotheria.anosite.guard.GuardFactory Maven / Gradle / Ivy
package net.anotheria.anosite.guard;
import net.anotheria.anoprise.metafactory.MetaFactory;
import net.anotheria.anoprise.metafactory.MetaFactoryException;
import net.anotheria.anosite.gen.asfederateddata.data.GuardDef;
import net.anotheria.anosite.gen.asfederateddata.service.IASFederatedDataService;
import org.slf4j.LoggerFactory;
import org.slf4j.MarkerFactory;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* A utility for guard instantiation.
* @author another
*
*/
public final class GuardFactory {
/**
* Guard cache.
*/
private static Map guards = new ConcurrentHashMap();
/**
* Federated data service for guard lookup.
*/
private static IASFederatedDataService service;
static {
try {
service = MetaFactory.get(IASFederatedDataService.class);
} catch (MetaFactoryException e) {
LoggerFactory.getLogger(GuardFactory.class).error(MarkerFactory.getMarker("FATAL"), "IASFederatedDataService init failure", e);
}
}
/**
* Creates a new conditional guards (or returns an existing one) by guards id.
* @param id of the guard.
* @return conditional guard.
*/
public static ConditionalGuard getConditionalGuard(String id){
ConditionalGuard g = null;
g = guards.get(id);
if (g==null){
synchronized(guards){
g = guards.get(id);
if (g==null){
try{
GuardDef def = service.getGuardDef(id);
g = (ConditionalGuard)Class.forName(def.getClazz()).newInstance();
guards.put(id, g);
}catch(Exception e){
throw new RuntimeException("Couldn't retrieve guard definition: "+e.getMessage()+", gid: "+id);
}
}
}//end synch
}
return g;
}
/**
* Prevent instantiation.
*/
private GuardFactory(){
}
}