| /* |
| * 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.nio.file.FileSystem; |
| import java.nio.file.Path; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * FileSystem that tracks open handles. |
| * <p> |
| * When {@link FileSystem#close()} is called, this class will throw |
| * an exception if any file handles are still open. |
| */ |
| public class LeakFS extends HandleTrackingFS { |
| // we explicitly use reference hashcode/equality in our keys |
| private final Map<Object,Exception> openHandles = new ConcurrentHashMap<>(); |
| |
| /** |
| * Create a new instance, tracking file handle leaks for the |
| * specified delegate filesystem. |
| * @param delegate delegate filesystem to wrap. |
| */ |
| public LeakFS(FileSystem delegate) { |
| super("leakfs://", delegate); |
| } |
| |
| @Override |
| protected void onOpen(Path path, Object stream) { |
| openHandles.put(stream, new Exception()); |
| } |
| |
| @Override |
| protected void onClose(Path path, Object stream) { |
| openHandles.remove(stream); |
| } |
| |
| @Override |
| public synchronized void onClose() { |
| if (!openHandles.isEmpty()) { |
| // print the first one as it's very verbose otherwise |
| Exception cause = null; |
| Iterator<Exception> stacktraces = openHandles.values().iterator(); |
| if (stacktraces.hasNext()) { |
| cause = stacktraces.next(); |
| } |
| throw new RuntimeException("file handle leaks: " + openHandles.keySet(), cause); |
| } |
| } |
| } |