1 package org.apache.lucene.store;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import java.net.ServerSocket;
21 import java.net.Socket;
22 import java.io.OutputStream;
23 import java.io.InputStream;
24 import java.io.IOException;
27 * Simple standalone server that must be running when you
28 * use {@link VerifyingLockFactory}. This server simply
29 * verifies at most one process holds the lock at a time.
30 * Run without any args to see usage.
32 * @see VerifyingLockFactory
36 public class LockVerifyServer {
38 private static String getTime(long startTime) {
39 return "[" + ((System.currentTimeMillis()-startTime)/1000) + "s] ";
42 public static void main(String[] args) throws IOException {
44 if (args.length != 1) {
45 System.out.println("\nUsage: java org.apache.lucene.store.LockVerifyServer port\n");
49 final int port = Integer.parseInt(args[0]);
51 ServerSocket s = new ServerSocket(port);
52 s.setReuseAddress(true);
53 System.out.println("\nReady on port " + port + "...");
56 long startTime = System.currentTimeMillis();
59 Socket cs = s.accept();
60 OutputStream out = cs.getOutputStream();
61 InputStream in = cs.getInputStream();
64 int command = in.read();
72 System.out.println(getTime(startTime) + " ERROR: id " + id + " got lock, but " + lockedID + " already holds the lock");
75 } else if (command == 0) {
78 System.out.println(getTime(startTime) + " ERROR: id " + id + " released the lock, but " + lockedID + " is the one holding the lock");
82 throw new RuntimeException("unrecognized command " + command);
84 System.out.print(".");