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/**
* This file is part of the CRISTAL-iSE kernel.
* Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* http://www.fsf.org/licensing/licenses/lgpl.html
*/
package org.cristalise.storage;
import java.util.HashMap;
import java.util.StringTokenizer;
import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.common.PersistencyException;
import org.cristalise.kernel.entity.AgentHelper;
import org.cristalise.kernel.entity.C2KLocalObject;
import org.cristalise.kernel.entity.Item;
import org.cristalise.kernel.entity.ItemHelper;
import org.cristalise.kernel.lookup.ItemPath;
import org.cristalise.kernel.lookup.Lookup;
import org.cristalise.kernel.persistency.ClusterStorage;
import org.cristalise.kernel.persistency.outcome.Outcome;
import org.cristalise.kernel.process.Gateway;
import org.cristalise.kernel.process.auth.Authenticator;
import org.cristalise.kernel.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<ItemPath, Item> entities = new HashMap<ItemPath, Item>();
Lookup lookup;
@Override
public void open(Authenticator auth) throws PersistencyException {
lookup = Gateway.getLookup();
}
@Override
public void close() throws PersistencyException {
}
// 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(ItemPath thisItem, String path) throws PersistencyException {
try {
Item thisEntity = getIOR(thisItem);
String type = getClusterType(path);
// fetch the xml from the item
String queryData = thisEntity.queryData(path);
if (Logger.doLog(6)) Logger.msg(6, "ProxyLoader - "+thisItem+":"+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 PersistencyException(e.getMessage());
}
return null;
}
// store object by path
@Override
public void put(ItemPath thisItem, C2KLocalObject obj) throws PersistencyException {
// not supported
throw new PersistencyException("Cannot write to items through the ProxyLoader");
}
// delete cluster
@Override
public void delete(ItemPath thisItem, String path) throws PersistencyException {
// not supported
throw new PersistencyException("Cannot write to items through the ProxyLoader");
}
/* navigation */
// directory listing
@Override
public String[] getClusterContents(ItemPath thisItem, String path) throws PersistencyException {
try {
Item thisEntity = getIOR(thisItem);
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 PersistencyException(e.getMessage());
}
}
private Item getIOR(ItemPath thisPath) throws PersistencyException {
if (entities.containsKey(thisPath)) {
// check the cache
Logger.msg(7, "ProxyLoader.getIOR() - "+thisPath+" cached.");
return entities.get(thisPath);
}
try {
Logger.msg(7, "ProxyLoader.getIOR() - Resolving "+thisPath+".");
org.omg.CORBA.Object ior = lookup.resolve(thisPath);
Item thisItem = null;
try {
thisItem = ItemHelper.narrow(ior);
} catch (org.omg.CORBA.BAD_PARAM ex) {
try {
thisItem = AgentHelper.narrow(ior);
} catch (org.omg.CORBA.BAD_PARAM ex2) {
throw new PersistencyException ("Could not narrow "+thisItem+" as a known Entity type");
}
}
Logger.msg(7, "ProxyLoader.getIOR() - Found "+thisItem+".");
entities.put(thisPath, thisItem);
return thisItem;
} catch (Exception e) {
throw new PersistencyException("Error narrowing "+thisPath+": "+e.getMessage());
}
}
}
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