| /* |
| * 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.jackrabbit.oak.segment.file; |
| |
| import static com.google.common.collect.Lists.newArrayList; |
| |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import com.google.common.base.Joiner; |
| import org.apache.jackrabbit.oak.segment.spi.persistence.SegmentArchiveManager; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Thread-safe class tracking files to be removed. |
| */ |
| public class FileReaper { |
| |
| private static final Logger logger = LoggerFactory.getLogger(FileReaper.class); |
| |
| private final Set<String> files = new HashSet<>(); |
| |
| private final Object lock = new Object(); |
| |
| private final SegmentArchiveManager archiveManager; |
| |
| public FileReaper(SegmentArchiveManager archiveManager) { |
| this.archiveManager = archiveManager; |
| } |
| |
| /** |
| * Add files to be removed. The same file can be added more than once. |
| * Duplicates are ignored. |
| * |
| * @param files group of files to be removed. |
| */ |
| void add(Iterable<String> files) { |
| synchronized (lock) { |
| for (String file : files) { |
| this.files.add(file); |
| } |
| } |
| } |
| |
| /** |
| * Reap previously added files. |
| */ |
| void reap() { |
| Set<String> reap; |
| |
| synchronized (lock) { |
| reap = new HashSet<>(files); |
| files.clear(); |
| } |
| |
| Set<String> redo = new HashSet<>(); |
| List<String> removed = newArrayList(); |
| for (String file : reap) { |
| if (archiveManager.delete(file)) { |
| removed.add(file); |
| } else { |
| logger.warn("Unable to remove file {}", file); |
| redo.add(file); |
| } |
| } |
| if (!removed.isEmpty()) { |
| logger.info("Removed files {}", Joiner.on(",").join(removed)); |
| } |
| |
| if (redo.isEmpty()) { |
| return; |
| } |
| |
| add(redo); |
| } |
| |
| } |