| /** |
| * 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.hadoop.hdfs.server.datanode; |
| |
| import java.util.regex.Pattern; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.URI; |
| import java.util.regex.Matcher; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.fs.StorageType; |
| import org.apache.hadoop.hdfs.server.common.Util; |
| import org.apache.hadoop.util.StringUtils; |
| |
| /** |
| * Encapsulates the URI and storage medium that together describe a |
| * storage directory. |
| * The default storage medium is assumed to be DISK, if none is specified. |
| * |
| */ |
| @InterfaceAudience.Private |
| public class StorageLocation { |
| final StorageType storageType; |
| final File file; |
| |
| /** Regular expression that describes a storage uri with a storage type. |
| * e.g. [Disk]/storages/storage1/ |
| */ |
| private static final Pattern regex = Pattern.compile("^\\[(\\w*)\\](.+)$"); |
| |
| private StorageLocation(StorageType storageType, URI uri) { |
| this.storageType = storageType; |
| |
| if (uri.getScheme() == null || |
| "file".equalsIgnoreCase(uri.getScheme())) { |
| // drop any (illegal) authority in the URI for backwards compatibility |
| this.file = new File(uri.getPath()); |
| } else { |
| throw new IllegalArgumentException("Unsupported URI schema in " + uri); |
| } |
| } |
| |
| public StorageType getStorageType() { |
| return this.storageType; |
| } |
| |
| URI getUri() { |
| return file.toURI(); |
| } |
| |
| public File getFile() { |
| return this.file; |
| } |
| |
| /** |
| * Attempt to parse a storage uri with storage class and URI. The storage |
| * class component of the uri is case-insensitive. |
| * |
| * @param rawLocation Location string of the format [type]uri, where [type] is |
| * optional. |
| * @return A StorageLocation object if successfully parsed, null otherwise. |
| * Does not throw any exceptions. |
| */ |
| public static StorageLocation parse(String rawLocation) |
| throws IOException, SecurityException { |
| Matcher matcher = regex.matcher(rawLocation); |
| StorageType storageType = StorageType.DEFAULT; |
| String location = rawLocation; |
| |
| if (matcher.matches()) { |
| String classString = matcher.group(1); |
| location = matcher.group(2); |
| if (!classString.isEmpty()) { |
| storageType = |
| StorageType.valueOf(StringUtils.toUpperCase(classString)); |
| } |
| } |
| |
| return new StorageLocation(storageType, Util.stringAsURI(location)); |
| } |
| |
| @Override |
| public String toString() { |
| return "[" + storageType + "]" + file.toURI(); |
| } |
| } |