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package com.c2kernel.persistency;
import java.util.HashMap;
import java.util.StringTokenizer;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.AgentHelper;
import com.c2kernel.entity.C2KLocalObject;
import com.c2kernel.entity.ItemHelper;
import com.c2kernel.entity.ManageableEntity;
import com.c2kernel.lookup.EntityPath;
import com.c2kernel.lookup.LDAPLookup;
import com.c2kernel.persistency.outcome.Outcome;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;
/** Used by proxies to load clusters by queryData from the Entity.
* Last client storage - only used if not cached elsewhere
*/
public class ProxyLoader extends ClusterStorage {
HashMap<Integer, ManageableEntity> entities = new HashMap<Integer, ManageableEntity>();
LDAPLookup lookup;
@Override
public void open() throws ClusterStorageException {
lookup = Gateway.getLDAPLookup();
}
@Override
public void close() throws ClusterStorageException {
}
// introspection
@Override
public short queryClusterSupport(String clusterType) {
return READ;
}
@Override
public String getName() {
return "Proxy Cluster Loader";
}
@Override
public String getId() {
return "CORBA";
}
// retrieve object by path
@Override
public C2KLocalObject get(Integer sysKey, String path) throws ClusterStorageException {
try {
ManageableEntity thisEntity = getIOR(sysKey);
String type = getClusterType(path);
// fetch the xml from the item
String queryData = thisEntity.queryData(path);
if (Logger.doLog(6)) Logger.msg(6, "ProxyLoader - "+sysKey+":"+path+" = "+queryData);
if (queryData != null) {
if (type.equals(OUTCOME))
return new Outcome(path, queryData);
else
return (C2KLocalObject)Gateway.getMarshaller().unmarshall(queryData);
}
} catch (ObjectNotFoundException e) {
return null;
} catch (Exception e) {
Logger.error(e);
throw new ClusterStorageException(e.getMessage());
}
return null;
}
// store object by path
@Override
public void put(Integer sysKey, C2KLocalObject obj) throws ClusterStorageException {
// not supported
throw new ClusterStorageException("Cannot write to items through the ProxyLoader");
}
// delete cluster
@Override
public void delete(Integer sysKey, String path) throws ClusterStorageException {
// not supported
throw new ClusterStorageException("Cannot write to items through the ProxyLoader");
}
/* navigation */
// directory listing
@Override
public String[] getClusterContents(Integer sysKey, String path) throws ClusterStorageException {
try {
ManageableEntity thisEntity = getIOR(sysKey);
String contents = thisEntity.queryData(path+"/all");
StringTokenizer tok = new StringTokenizer(contents, ",");
String[] result = new String[tok.countTokens()];
for (int i=0; i<result.length; i++)
result[i] = tok.nextToken();
return result;
} catch (Exception e) {
Logger.error(e);
throw new ClusterStorageException(e.getMessage());
}
}
private ManageableEntity getIOR(Integer sysKey) throws ClusterStorageException {
if (entities.containsKey(sysKey)) {
// check the cache
Logger.msg(7, "ProxyLoader.getIOR() - "+sysKey+" cached.");
return entities.get(sysKey);
}
try {
Logger.msg(7, "ProxyLoader.getIOR() - Resolving "+sysKey+".");
org.omg.CORBA.Object ior = lookup.getIOR(new EntityPath(sysKey.intValue()));
ManageableEntity thisEntity = null;
try {
thisEntity = ItemHelper.narrow(ior);
} catch (org.omg.CORBA.BAD_PARAM ex) {
try {
thisEntity = AgentHelper.narrow(ior);
} catch (org.omg.CORBA.BAD_PARAM ex2) {
throw new ClusterStorageException ("Could not narrow "+sysKey+" as a known Entity type");
}
}
Logger.msg(7, "ProxyLoader.getIOR() - Found "+sysKey+".");
entities.put(sysKey, thisEntity);
return thisEntity;
} catch (Exception e) {
throw new ClusterStorageException("Error narrowing "+sysKey+": "+e.getMessage());
}
}
}
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