| /* |
| * 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.FileSystem; |
| import java.nio.file.FileSystemException; |
| import java.nio.file.Path; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * FileSystem that throws exception if file handles |
| * in use exceeds a specified limit |
| */ |
| public class HandleLimitFS extends HandleTrackingFS { |
| final int limit; |
| final AtomicInteger count = new AtomicInteger(); |
| |
| /** |
| * Create a new instance, limiting the maximum number |
| * of open files to {@code limit} |
| * @param delegate delegate filesystem to wrap. |
| * @param limit maximum number of open files. |
| */ |
| public HandleLimitFS(FileSystem delegate, int limit) { |
| super("handlelimit://", delegate); |
| this.limit = limit; |
| } |
| |
| @Override |
| protected void onOpen(Path path, Object stream) throws IOException { |
| if (count.incrementAndGet() > limit) { |
| count.decrementAndGet(); |
| throw new FileSystemException(path.toString(), null, "Too many open files"); |
| } |
| } |
| |
| @Override |
| protected void onClose(Path path, Object stream) throws IOException { |
| count.decrementAndGet(); |
| } |
| } |