/*
* Mojito Distributed Hash Table (Mojito DHT)
* Copyright (C) 2006-2007 LimeWire LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.limewire.mojito.handler.request;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.limewire.mojito.Context;
import org.limewire.mojito.messages.PingRequest;
import org.limewire.mojito.messages.PingResponse;
import org.limewire.mojito.messages.RequestMessage;
import org.limewire.mojito.routing.Contact;
import org.limewire.mojito.util.MessageUtils;
/**
* Handles incoming Ping requests.
*/
public class PingRequestHandler extends AbstractRequestHandler {
private static final Log LOG = LogFactory.getLog(PingRequestHandler.class);
public PingRequestHandler(Context context) {
super(context);
}
@Override
public void request(RequestMessage message) throws IOException {
PingRequest request = (PingRequest)message;
Contact node = request.getContact();
// Don't respond to pings while we're bootstrapping! This
// makes sure nobody can use us as the initial bootstrap
// Node as we've (likely) poor knowledge of the DHT in this
// stage. The only exception from this are collision test
// pings!
if (context.isBootstrapping()
&& !MessageUtils.isCollisionPingRequest(
context.getLocalNodeID(), message)) {
if (LOG.isInfoEnabled()) {
LOG.info("Received a PingRequest from " + node
+ " but local Node is bootstrapping");
}
return;
}
PingResponse response = context.getMessageHelper()
.createPingResponse(request, node.getContactAddress());
context.getMessageDispatcher().send(node, response);
}
}