| /* |
| * 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.visitor; |
| |
| import org.apache.hadoop.hdfs.server.namenode.INode; |
| import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * For validating {@link org.apache.hadoop.hdfs.server.namenode.FSImage}s. |
| */ |
| public class INodeCountVisitor implements NamespaceVisitor { |
| public interface Counts { |
| int getCount(INode inode); |
| } |
| |
| public static Counts countTree(INode root) { |
| return new INodeCountVisitor().count(root); |
| } |
| |
| private static class SetElement { |
| private final INode inode; |
| private final AtomicInteger count = new AtomicInteger(); |
| |
| SetElement(INode inode) { |
| this.inode = inode; |
| } |
| |
| int getCount() { |
| return count.get(); |
| } |
| |
| int incrementAndGet() { |
| return count.incrementAndGet(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } else if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| final SetElement that = (SetElement) obj; |
| return this.inode.getId() == that.inode.getId(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Long.hashCode(inode.getId()); |
| } |
| } |
| |
| static class INodeSet implements Counts { |
| private final ConcurrentMap<SetElement, SetElement> map |
| = new ConcurrentHashMap<>(); |
| |
| int put(INode inode, int snapshot) { |
| final SetElement key = new SetElement(inode); |
| final SetElement previous = map.putIfAbsent(key, key); |
| final SetElement current = previous != null? previous: key; |
| return current.incrementAndGet(); |
| } |
| |
| @Override |
| public int getCount(INode inode) { |
| final SetElement key = new SetElement(inode); |
| final SetElement value = map.get(key); |
| return value != null? value.getCount(): 0; |
| } |
| } |
| |
| private final INodeSet inodes = new INodeSet(); |
| |
| @Override |
| public INodeVisitor getDefaultVisitor() { |
| return new INodeVisitor() { |
| @Override |
| public void visit(INode iNode, int snapshot) { |
| inodes.put(iNode, snapshot); |
| } |
| }; |
| } |
| |
| private Counts count(INode root) { |
| root.accept(this, Snapshot.CURRENT_STATE_ID); |
| return inodes; |
| } |
| } |