edu.umass.cs.msocket.gns.GnsSocketAddress.java Source code

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Here is the source code for edu.umass.cs.msocket.gns.GnsSocketAddress.java

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/*******************************************************************************
 *
 * Mobility First - mSocket library
 * Copyright (C) 2013, 2014 - University of Massachusetts Amherst
 * Contact: arun@cs.umass.edu
 *
 * 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. 
 *
 * Initial developer(s): Arun Venkataramani, Aditya Yadav, Emmanuel Cecchet.
 * Contributor(s): ______________________.
 *
 *******************************************************************************/

package edu.umass.cs.msocket.gns;

import java.net.SocketAddress;
import java.util.LinkedList;

import org.json.JSONArray;

import edu.umass.cs.gns.client.GuidEntry;
import edu.umass.cs.gns.client.UniversalGnsClient;

/**
 * This class defines a GnsSocketAddress
 * 
 * @author <a href="mailto:cecchet@cs.umass.edu">Emmanuel Cecchet</a>
 * @version 1.0
 */
public class GnsSocketAddress extends SocketAddress {
    private static final long serialVersionUID = -5992203106444616039L;

    private UniversalGnsClient gnsClient;
    private GuidEntry myGuid;
    private String ip;
    private int port;
    private boolean isProxy;

    /**
     * Creates a new <code>InetGnsAddress</code> object
     * 
     * @param client the client library to use to access the GNS
     * @param myGuid the GUID to use to access the GNS
     */
    public GnsSocketAddress(UniversalGnsClient client, GuidEntry myGuid) {
        if (client == null)
            throw new NullPointerException("Invalid null GNS client in InetGnsAddress");
        this.gnsClient = client;
        this.myGuid = myGuid;
    }

    /**
     * Get all IP address/port number for the given service belonging to the guid.
     * 
     * @param guid guid to lookup
     * @param serviceName service to access
     * @return array of InetSocketAddres or null if no address was found
     * @throws Exception if a GNS error occurs
     */
    public GnsSocketAddress[] getAllByGuid(String guid, String serviceName) throws Exception {
        JSONArray addresses = gnsClient.fieldRead(guid, serviceName, myGuid);

        if (addresses.length() == 0)
            return null;

        LinkedList<GnsSocketAddress> addrList = new LinkedList<GnsSocketAddress>();

        for (int i = 0; i < addresses.length(); i++) {
            GnsSocketAddress sock = new GnsSocketAddress(gnsClient, myGuid);
            String ipPort = addresses.getString(i);
            if (ipPort.startsWith("P")) {
                sock.setProxy(true);
                ipPort = ipPort.substring(1);
            } else
                sock.setProxy(false);
            int colon = ipPort.indexOf(':');
            if (colon == -1)
                throw new Exception("Invalid IP:Port value " + ipPort + " for service " + serviceName);

            sock.setIp(ipPort.substring(0, colon));
            sock.setPort(Integer.valueOf(ipPort.substring(colon + 1)));
            addrList.add(sock);
        }

        return addrList.toArray(new GnsSocketAddress[addrList.size()]);
    }

    /**
     * Get the first IP address/port number for the given service belonging to the
     * guid.
     * 
     * @param guid guid to lookup
     * @param serviceName service to access
     * @return an InetSocketAddres
     * @throws Exception if a GNS error occurs
     */
    public GnsSocketAddress getByGuid(String guid, String serviceName) throws Exception {
        final GnsSocketAddress[] addrs = getAllByGuid(guid, serviceName);
        if (addrs == null)
            return null;
        else
            return addrs[0];
    }

    /**
     * Get all IP address/port number for the given service belonging to the
     * entity/alias.
     * 
     * @param serviceName service to access
     * @return array of InetSocketAddres if a GNS error occurs
     * @throws Exception if a GNS error occurs
     */
    public GnsSocketAddress[] getAllByEntityName(String serviceName) throws Exception {
        String guid = gnsClient.lookupGuid(serviceName);
        return getAllByGuid(guid, serviceName);

    }

    /**
     * Get the first IP address/port number for the given service belonging to the
     * entity/alias.
     * 
     * @param serviceName service to access
     * @return an InetSocketAddres
     * @throws Exception if a GNS error occurs
     */
    public GnsSocketAddress getByEntityName(String serviceName) throws Exception {
        final GnsSocketAddress[] addrs = getAllByEntityName(serviceName);
        if (addrs == null || addrs.length == 0)
            return null;
        else
            return addrs[0];
    }

    /**
     * Returns the ip value.
     * 
     * @return Returns the ip.
     */
    public String getIp() {
        return ip;
    }

    /**
     * Sets the ip value.
     * 
     * @param ip The ip to set.
     */
    public void setIp(String ip) {
        this.ip = ip;
    }

    /**
     * Returns the port value.
     * 
     * @return Returns the port.
     */
    public int getPort() {
        return port;
    }

    /**
     * Sets the port value.
     * 
     * @param port The port to set.
     */
    public void setPort(int port) {
        this.port = port;
    }

    /**
     * Returns the isProxy value.
     * 
     * @return Returns the isProxy.
     */
    public boolean isProxy() {
        return isProxy;
    }

    /**
     * Sets the isProxy value.
     * 
     * @param isProxy The isProxy to set.
     */
    public void setProxy(boolean isProxy) {
        this.isProxy = isProxy;
    }

}