| /* |
| * 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.cassandra.db; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.lang.management.ManagementFactory; |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| |
| import javax.management.MBeanServer; |
| import javax.management.ObjectName; |
| |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| |
| public class BlacklistedDirectories implements BlacklistedDirectoriesMBean |
| { |
| public static final String MBEAN_NAME = "org.apache.cassandra.db:type=BlacklistedDirectories"; |
| private static final Logger logger = LoggerFactory.getLogger(BlacklistedDirectories.class); |
| private static final BlacklistedDirectories instance = new BlacklistedDirectories(); |
| |
| private final Set<File> unreadableDirectories = new CopyOnWriteArraySet<File>(); |
| private final Set<File> unwritableDirectories = new CopyOnWriteArraySet<File>(); |
| |
| private BlacklistedDirectories() |
| { |
| // Register this instance with JMX |
| try |
| { |
| MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| mbs.registerMBean(this, new ObjectName(MBEAN_NAME)); |
| } |
| catch (Exception e) |
| { |
| JVMStabilityInspector.inspectThrowable(e); |
| logger.error("error registering MBean {}", MBEAN_NAME, e); |
| //Allow the server to start even if the bean can't be registered |
| } |
| } |
| |
| public Set<File> getUnreadableDirectories() |
| { |
| return Collections.unmodifiableSet(unreadableDirectories); |
| } |
| |
| public Set<File> getUnwritableDirectories() |
| { |
| return Collections.unmodifiableSet(unwritableDirectories); |
| } |
| |
| public void markUnreadable(String path) |
| { |
| maybeMarkUnreadable(new File(path)); |
| } |
| |
| public void markUnwritable(String path) |
| { |
| maybeMarkUnwritable(new File(path)); |
| } |
| |
| /** |
| * Adds parent directory of the file (or the file itself, if it is a directory) |
| * to the set of unreadable directories. |
| * |
| * @return the blacklisted directory or null if nothing has been added to the list. |
| */ |
| public static File maybeMarkUnreadable(File path) |
| { |
| File directory = getDirectory(path); |
| if (instance.unreadableDirectories.add(directory)) |
| { |
| logger.warn("Blacklisting {} for reads", directory); |
| return directory; |
| } |
| return null; |
| } |
| |
| /** |
| * Adds parent directory of the file (or the file itself, if it is a directory) |
| * to the set of unwritable directories. |
| * |
| * @return the blacklisted directory or null if nothing has been added to the list. |
| */ |
| public static File maybeMarkUnwritable(File path) |
| { |
| File directory = getDirectory(path); |
| if (instance.unwritableDirectories.add(directory)) |
| { |
| logger.warn("Blacklisting {} for writes", directory); |
| return directory; |
| } |
| return null; |
| } |
| |
| /** |
| * Tells whether or not the directory is blacklisted for reads. |
| * @return whether or not the directory is blacklisted for reads. |
| */ |
| public static boolean isUnreadable(File directory) |
| { |
| return instance.unreadableDirectories.contains(directory); |
| } |
| |
| /** |
| * Tells whether or not the directory is blacklisted for writes. |
| * @return whether or not the directory is blacklisted for reads. |
| */ |
| public static boolean isUnwritable(File directory) |
| { |
| return instance.unwritableDirectories.contains(directory); |
| } |
| |
| private static File getDirectory(File file) |
| { |
| if (file.isDirectory()) |
| return file; |
| |
| if (file.isFile()) |
| return file.getParentFile(); |
| |
| // the file with path cannot be read - try determining the directory manually. |
| if (file.getPath().endsWith(".db")) |
| return file.getParentFile(); |
| |
| // We may not be able to determine if it's a file or a directory if |
| // we were called because we couldn't create the file/directory. |
| return file; |
| } |
| } |