LockVerifyServer.cs

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/* 
 * 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.
 */

using System;

namespace Lucene.Net.Store
{
    
    /// <summary> Simple standalone server that must be running when you
    /// use <see cref="VerifyingLockFactory" />.  This server simply
    /// verifies at most one process holds the lock at a time.
    /// Run without any args to see usage.
    /// 
    /// </summary>
    /// <seealso cref="VerifyingLockFactory">
    /// </seealso>
    /// <seealso cref="LockStressTest">
    /// </seealso>
    
    public class LockVerifyServer
    {
        
        private static System.String GetTime(long startTime)
        {
            return "[" + (((DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond) - startTime) / 1000) + "s] ";
        }
        
        [STAThread]
        public static void  Main(System.String[] args)
        {
            
            if (args.Length != 1)
            {
                System.Console.Out.WriteLine("\nUsage: java Lucene.Net.Store.LockVerifyServer port\n");
                System.Environment.Exit(1);
            }
            
            int port = System.Int32.Parse(args[0]);
            
            System.Net.Sockets.TcpListener temp_tcpListener;
            temp_tcpListener = new System.Net.Sockets.TcpListener(System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList[0], port);
            temp_tcpListener.Server.SetSocketOption(System.Net.Sockets.SocketOptionLevel.Socket, System.Net.Sockets.SocketOptionName.ReuseAddress, 1);
            temp_tcpListener.Start();
            System.Net.Sockets.TcpListener s = temp_tcpListener;
            System.Console.Out.WriteLine("\nReady on port " + port + "...");
            
            int lockedID = 0;
            long startTime = (DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond);
            
            while (true)
            {
                System.Net.Sockets.TcpClient cs = s.AcceptTcpClient();
                System.IO.Stream out_Renamed = cs.GetStream();
                System.IO.Stream in_Renamed = cs.GetStream();
                
                int id = in_Renamed.ReadByte();
                int command = in_Renamed.ReadByte();
                
                bool err = false;
                
                if (command == 1)
                {
                    // Locked
                    if (lockedID != 0)
                    {
                        err = true;
                        System.Console.Out.WriteLine(GetTime(startTime) + " ERROR: id " + id + " got lock, but " + lockedID + " already holds the lock");
                    }
                    lockedID = id;
                }
                else if (command == 0)
                {
                    if (lockedID != id)
                    {
                        err = true;
                        System.Console.Out.WriteLine(GetTime(startTime) + " ERROR: id " + id + " released the lock, but " + lockedID + " is the one holding the lock");
                    }
                    lockedID = 0;
                }
                else
                    throw new System.SystemException("unrecognized command " + command);
                
                System.Console.Out.Write(".");
                
                if (err)
                    out_Renamed.WriteByte((System.Byte) 1);
                else
                    out_Renamed.WriteByte((System.Byte) 0);
                
                out_Renamed.Close();
                in_Renamed.Close();
                cs.Close();
            }
        }
    }
}