| /** |
| * 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.namenode; |
| |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Maps; |
| import com.google.protobuf.ByteString; |
| |
| import java.nio.ByteBuffer; |
| import java.util.AbstractMap; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.NavigableMap; |
| import java.util.Set; |
| import java.util.TreeMap; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import static org.apache.hadoop.hdfs.server.namenode.INodeId.INVALID_INODE_ID; |
| import static org.apache.hadoop.hdfs.server.namenode.INodeId.ROOT_INODE_ID; |
| |
| class DB { |
| void addRoot(ByteString root) { |
| INodeContainer c = new INodeContainer(); |
| c.inode(root); |
| inodeMap.put(ROOT_INODE_ID, c); |
| } |
| |
| static class INodeContainer { |
| private static final NavigableMap<ByteBuffer, Long> EMPTY_MAP = |
| Collections.unmodifiableNavigableMap(new TreeMap<ByteBuffer, Long>()); |
| private ByteString inode; |
| /** |
| * NOTE: The caller is responsible to ensure that the container owns the |
| * ByteBuffer. |
| */ |
| private TreeMap<ByteBuffer, Long> children; |
| ByteString inode() { |
| return inode; |
| } |
| |
| void inode(ByteString inode) { |
| this.inode = inode; |
| } |
| |
| long getChild(ByteBuffer childName) { |
| return children == null ? INVALID_INODE_ID : children |
| .getOrDefault(childName, INVALID_INODE_ID); |
| } |
| |
| Map<ByteBuffer, Long> ensureChildrenList() { |
| if (children == null) { |
| children = new TreeMap<>(); |
| } |
| return children; |
| } |
| |
| Map<ByteBuffer, Long> children() { |
| return children; |
| } |
| |
| NavigableMap<ByteBuffer, Long> readOnlyChildren() { |
| return children == null ? EMPTY_MAP : Collections |
| .unmodifiableNavigableMap(children); |
| } |
| } |
| |
| private final ReentrantReadWriteLock lock; |
| |
| private HashMap<Long, INodeContainer> inodeMap = new |
| HashMap<>(); |
| |
| HashMap<Long, INodeContainer> inodeMap() { |
| return inodeMap; |
| } |
| |
| DB.INodeContainer ensureContainer(long inodeId) { |
| DB.INodeContainer c = inodeMap.get(inodeId); |
| if (c == null) { |
| c = new DB.INodeContainer(); |
| inodeMap.put(inodeId, c); |
| } |
| return c; |
| } |
| |
| INodeContainer getINode(long id) { |
| return inodeMap.get(id); |
| } |
| |
| ReentrantReadWriteLock lock() { |
| return lock; |
| } |
| |
| DB(ReentrantReadWriteLock lock) { |
| this.lock = lock; |
| } |
| } |