/*
 * 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.
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package org.apache.lucene.store;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Random;

import org.apache.lucene.util.SuppressForbidden;

Simple standalone tool that forever acquires and releases a lock using a specific LockFactory. Run without any args to see usage.
See Also:
/** * Simple standalone tool that forever acquires and releases a * lock using a specific LockFactory. Run without any args * to see usage. * * @see VerifyingLockFactory * @see LockVerifyServer */
public class LockStressTest { static final String LOCK_FILE_NAME = "test.lock"; @SuppressForbidden(reason = "System.out required: command line tool") @SuppressWarnings("try") public static void main(String[] args) throws Exception { if (args.length != 7) { System.out.println("Usage: java org.apache.lucene.store.LockStressTest myID verifierHost verifierPort lockFactoryClassName lockDirName sleepTimeMS count\n" + "\n" + " myID = int from 0 .. 255 (should be unique for test process)\n" + " verifierHost = hostname that LockVerifyServer is listening on\n" + " verifierPort = port that LockVerifyServer is listening on\n" + " lockFactoryClassName = primary FSLockFactory class that we will use\n" + " lockDirName = path to the lock directory\n" + " sleepTimeMS = milliseconds to pause betweeen each lock obtain/release\n" + " count = number of locking tries\n" + "\n" + "You should run multiple instances of this process, each with its own\n" + "unique ID, and each pointing to the same lock directory, to verify\n" + "that locking is working correctly.\n" + "\n" + "Make sure you are first running LockVerifyServer."); System.exit(1); } int arg = 0; final int myID = Integer.parseInt(args[arg++]); if (myID < 0 || myID > 255) { System.out.println("myID must be a unique int 0..255"); System.exit(1); } final String verifierHost = args[arg++]; final int verifierPort = Integer.parseInt(args[arg++]); final String lockFactoryClassName = args[arg++]; final Path lockDirPath = Paths.get(args[arg++]); final int sleepTimeMS = Integer.parseInt(args[arg++]); final int count = Integer.parseInt(args[arg++]); final LockFactory lockFactory = getNewLockFactory(lockFactoryClassName); // we test the lock factory directly, so we don't need it on the directory itsself (the directory is just for testing) final FSDirectory lockDir = new SimpleFSDirectory(lockDirPath, NoLockFactory.INSTANCE); final InetSocketAddress addr = new InetSocketAddress(verifierHost, verifierPort); System.out.println("Connecting to server " + addr + " and registering as client " + myID + "..."); try (Socket socket = new Socket()) { socket.setReuseAddress(true); socket.connect(addr, 500); final OutputStream out = socket.getOutputStream(); final InputStream in = socket.getInputStream(); out.write(myID); out.flush(); LockFactory verifyLF = new VerifyingLockFactory(lockFactory, in, out); final Random rnd = new Random(); // wait for starting gun if (in.read() != 43) { throw new IOException("Protocol violation"); } for (int i = 0; i < count; i++) { try (final Lock l = verifyLF.obtainLock(lockDir, LOCK_FILE_NAME)) { if (rnd.nextInt(10) == 0) { if (rnd.nextBoolean()) { verifyLF = new VerifyingLockFactory(getNewLockFactory(lockFactoryClassName), in, out); } try (final Lock secondLock = verifyLF.obtainLock(lockDir, LOCK_FILE_NAME)) { throw new IOException("Double obtain"); } catch (LockObtainFailedException loe) { // pass } } Thread.sleep(sleepTimeMS); } catch (LockObtainFailedException loe) { // obtain failed } if (i % 500 == 0) { System.out.println((i * 100. / count) + "% done."); } Thread.sleep(sleepTimeMS); } } System.out.println("Finished " + count + " tries."); } private static FSLockFactory getNewLockFactory(String lockFactoryClassName) throws IOException { // try to get static INSTANCE field of class try { return (FSLockFactory) Class.forName(lockFactoryClassName).getField("INSTANCE").get(null); } catch (ReflectiveOperationException e) { // fall-through } // try to create a new instance try { return Class.forName(lockFactoryClassName).asSubclass(FSLockFactory.class).newInstance(); } catch (ReflectiveOperationException | ClassCastException e) { // fall-through } throw new IOException("Cannot get lock factory singleton of " + lockFactoryClassName); } }