/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.mount;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.oncrpc.RpcProgram;
import org.apache.hadoop.oncrpc.SimpleTcpServer;
import org.apache.hadoop.oncrpc.SimpleUdpServer;
import org.apache.hadoop.portmap.PortmapMapping;
import org.apache.hadoop.util.ShutdownHookManager;
import static org.apache.hadoop.util.ExitUtil.terminate;
/**
* Main class for starting mountd daemon. This daemon implements the NFS
* mount protocol. When receiving a MOUNT request from an NFS client, it checks
* the request against the list of currently exported file systems. If the
* client is permitted to mount the file system, rpc.mountd obtains a file
* handle for requested directory and returns it to the client.
*/
abstract public class MountdBase {
public static final Log LOG = LogFactory.getLog(MountdBase.class);
private final RpcProgram rpcProgram;
private int udpBoundPort; // Will set after server starts
private int tcpBoundPort; // Will set after server starts
public RpcProgram getRpcProgram() {
return rpcProgram;
}
/**
* Constructor
* @param program
* @throws IOException
*/
public MountdBase(RpcProgram program) throws IOException {
rpcProgram = program;
}
/* Start UDP server */
private void startUDPServer() {
SimpleUdpServer udpServer = new SimpleUdpServer(rpcProgram.getPort(),
rpcProgram, 1);
rpcProgram.startDaemons();
udpServer.run();
udpBoundPort = udpServer.getBoundPort();
}
/* Start TCP server */
private void startTCPServer() {
SimpleTcpServer tcpServer = new SimpleTcpServer(rpcProgram.getPort(),
rpcProgram, 1);
rpcProgram.startDaemons();
tcpServer.run();
tcpBoundPort = tcpServer.getBoundPort();
}
public void start(boolean register) {
startUDPServer();
startTCPServer();
if (register) {
ShutdownHookManager.get().addShutdownHook(new Unregister(),
SHUTDOWN_HOOK_PRIORITY);
try {
rpcProgram.register(PortmapMapping.TRANSPORT_UDP, udpBoundPort);
rpcProgram.register(PortmapMapping.TRANSPORT_TCP, tcpBoundPort);
} catch (Throwable e) {
LOG.fatal("Failed to start the server. Cause:", e);
terminate(1, e);
}
}
}
/**
* Priority of the mountd shutdown hook.
*/
public static final int SHUTDOWN_HOOK_PRIORITY = 10;
private class Unregister implements Runnable {
@Override
public synchronized void run() {
rpcProgram.unregister(PortmapMapping.TRANSPORT_UDP, udpBoundPort);
rpcProgram.unregister(PortmapMapping.TRANSPORT_TCP, tcpBoundPort);
}
}
}