缓存设计

/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jbpm.pvm.internal.repository;

import java.util.HashMap;
import java.util.Map;


/**
* @author Tom Baeyens
*/
public class RepositoryCacheImpl implements RepositoryCache {

Map<String, Map<String, Object>> deployments = new HashMap<String, Map<String,Object>>();

public Object get(String deploymentId, String objectName) {
Map<String, Object> deploymentObjects = deployments.get(deploymentId);
if (deploymentObjects==null) {
return null;
}
return deploymentObjects.get(objectName);
}

public void set(String deploymentId, Map<String, Object> objects) {
if (objects==null) {
deployments.put(deploymentId, null);
} else {
Map<String, Object> deploymentObjects = deployments.get(deploymentId);
if (deploymentObjects==null) {
deploymentObjects = new HashMap<String, Object>();
deployments.put(deploymentId, deploymentObjects);
}
for (String objectName: objects.keySet()) {
Object object = objects.get(objectName);
deploymentObjects.put(objectName, object);
}
}
}

public void remove(String deploymentDbid) {
if (deployments!=null) {
deployments.remove(deploymentDbid);
}
}

public void clear() {
deployments = new HashMap<String, Map<String,Object>>();
}
}