net.dfs.server.filespace.creator.impl.FileSpaceCreatorImpl.java Source code

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Here is the source code for net.dfs.server.filespace.creator.impl.FileSpaceCreatorImpl.java

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/**
 * Copyright 2008 Rukshan Silva
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * http://www.apache.org/licenses/LICENSE-2.0 
 * Unless required by applicable law or agreed to in writing, 
 * software distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and limitations 
 * under the License.
 */

package net.dfs.server.filespace.creator.impl;

import java.io.IOException;
import java.net.InetAddress;

import net.dfs.server.filespace.creator.FileSpaceCreator;
import net.jini.core.discovery.LookupLocator;
import net.jini.core.lookup.ServiceRegistrar;
import net.jini.core.lookup.ServiceTemplate;
import net.jini.space.JavaSpace;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Implementation of the {@link FileSpaceCreator} which creates the security 
 * policy and then will create and return the Space for the given host address.
 * 
 * @author Rukshan Silva
 * @version 1.0
 */
public class FileSpaceCreatorImpl implements FileSpaceCreator {
    private Log log = LogFactory.getLog(FileSpaceCreatorImpl.class);

    /**
     * getSpace will simply creates a security manager. Establishes a RMI connection 
     * which will be used in connection to the remote nodes. And finally, will create 
     * a virtual Space and return an instance of it to the caller. An 
     * IOException or a ClassNotFoundException will be thrown on a failure.
     * 
     * @param host the address of the node in which the Space needed to be created.
     * @return the newly created Space.
     */
    @SuppressWarnings("unchecked")
    public JavaSpace getSpace(InetAddress host, InetAddress requester) {

        try {
            log.info("Space Reqested by " + requester.getHostAddress());

            SecurityPolicyManager.securityManager();
            LookupLocator lookup = new LookupLocator("jini://localhost");
            ServiceRegistrar registrar = lookup.getRegistrar();

            Class[] types = new Class[] { JavaSpace.class };
            JavaSpace space = (JavaSpace) registrar.lookup(new ServiceTemplate(null, types, null));

            log.info("Space Returned to " + requester.getHostAddress());

            return space;

        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            System.exit(1);
        }
        return null;
    }

}