| /* |
| * 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.lucene.mockfile; |
| |
| import java.io.IOException; |
| import java.nio.file.AccessDeniedException; |
| import java.nio.file.FileSystem; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.lucene.index.IndexWriter; |
| import org.apache.lucene.util.LuceneTestCase; |
| |
| /** |
| * Acts like a virus checker on Windows, where random programs may open the files you just wrote in an unfriendly |
| * way preventing deletion (e.g. not passing FILE_SHARE_DELETE) or renaming or overwriting etc. This is more evil |
| * than WindowsFS which just prevents deletion of files you still old open. |
| */ |
| public class VirusCheckingFS extends FilterFileSystemProvider { |
| |
| private volatile boolean enabled = true; |
| |
| private final AtomicLong state; |
| |
| /** |
| * Create a new instance, wrapping {@code delegate}. |
| */ |
| public VirusCheckingFS(FileSystem delegate, long salt) { |
| super("viruschecking://", delegate); |
| this.state = new AtomicLong(salt); |
| } |
| |
| public void enable() { |
| enabled = true; |
| } |
| |
| public boolean isEnabled() { |
| return enabled; |
| } |
| |
| public void disable() { |
| enabled = false; |
| } |
| |
| @Override |
| public void delete(Path path) throws IOException { |
| |
| // Fake but deterministic and hopefully portable like-randomness: |
| long hash = state.incrementAndGet() * path.getFileName().hashCode(); |
| |
| if (enabled // test infra disables when it's "really" time to delete after test is done, so it can reclaim temp dirs |
| && Files.exists(path) // important that we NOT delay a NoSuchFileException until later |
| && path.getFileName().toString().equals(IndexWriter.WRITE_LOCK_NAME) == false // life is particularly difficult if the virus checker hits our lock file |
| && (hash % 5) == 1) { |
| if (LuceneTestCase.VERBOSE) { |
| System.out.println("NOTE: VirusCheckingFS now refusing to delete " + path); |
| } |
| throw new AccessDeniedException("VirusCheckingFS is randomly refusing to delete file \"" + path + "\""); |
| } |
| super.delete(path); |
| } |
| |
| // TODO: we could be more evil here, e.g. rename, createOutput, deleteIfExists |
| } |