| /******************************************************************************* |
| * Copyright (c) 2005, 2009 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.p2.tests.engine; |
| |
| import java.io.*; |
| import java.nio.channels.FileLock; |
| |
| /** |
| * |
| * This is a tiny console app used by {@link ProfileRegistryTest#testProfileLocking()}, |
| * to simulate an external locking mechanism that is triggered as a new process. This |
| * code is invoked via the jar file kept in testData/engineTest/SimpleFileLockerApp.jar, |
| * which is generated by exporting this single class as a JAR. |
| */ |
| public class SimpleFileLockerApp { |
| File lockFile; |
| RandomAccessFile raf; |
| FileLock lock; |
| |
| SimpleFileLockerApp(File lock) { |
| lockFile = lock; |
| } |
| |
| void create() { |
| try { |
| raf = new RandomAccessFile(lockFile, "rw"); //$NON-NLS-1$ |
| String lockMode = System.getProperty("osgi.locking"); //$NON-NLS-1$ |
| lockMode = (lockMode == null || lockMode.length() == 0) ? "java.nio" : lockMode; //$NON-NLS-1$ |
| if ("java.io".equalsIgnoreCase(lockMode)) { //$NON-NLS-1$ |
| raf.writeByte(0); |
| } else { |
| lock = raf.getChannel().tryLock(0, 1, false); |
| } |
| } catch (FileNotFoundException e) { |
| remove(); |
| e.printStackTrace(); |
| } catch (IOException e) { |
| remove(); |
| e.printStackTrace(); |
| } |
| } |
| |
| void remove() { |
| if (raf != null) { |
| try { |
| if (lock != null) { |
| lock.release(); |
| } |
| raf.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| raf = null; |
| lockFile.delete(); |
| } |
| } |
| |
| public static void main(String[] args) { |
| final String LOCK_FILENAME = ".lock"; //$NON-NLS-1$ |
| if (args == null || args.length < 1) { |
| throw new IllegalArgumentException("Should have at least one arg - path."); //$NON-NLS-1$ |
| } |
| File lockDir = new File(args[0]); |
| lockDir.mkdir(); |
| SimpleFileLockerApp extLock = new SimpleFileLockerApp(new File(lockDir, LOCK_FILENAME)); |
| File waitUntil = new File(lockDir, ".done"); //$NON-NLS-1$ |
| waitUntil.delete(); |
| |
| extLock.create(); |
| |
| final int MAX_RETRIES; // A guard against looping indefinitely! |
| if (args.length > 1) { |
| MAX_RETRIES = getMax(args[1]); |
| } else { |
| MAX_RETRIES = 20; |
| } |
| int attempts = 0; |
| while (attempts++ < MAX_RETRIES && !waitUntil.exists()) { |
| try { |
| Thread.sleep(2000); |
| } catch (InterruptedException e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } |
| } |
| |
| extLock.remove(); |
| extLock = null; |
| |
| waitUntil.delete(); |
| |
| } |
| |
| private static int getMax(String str) { |
| int num = 20; |
| try { |
| num = Integer.parseInt(str); |
| } catch (NumberFormatException e) { |
| e.printStackTrace(); |
| } |
| return num; |
| } |
| } |