| /** |
| * 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.protocol; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Optional; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.fs.InvalidPathHandleException; |
| import org.apache.hadoop.fs.PathHandle; |
| import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.HdfsPathHandleProto; |
| |
| import com.google.protobuf.ByteString; |
| |
| /** |
| * Opaque handle to an entity in HDFS. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public final class HdfsPathHandle implements PathHandle { |
| |
| private static final long serialVersionUID = 0xc53087a5428L; |
| |
| private final String path; |
| private final Long mtime; |
| private final Long inodeId; |
| |
| public HdfsPathHandle(String path, |
| Optional<Long> inodeId, Optional<Long> mtime) { |
| this.path = path; |
| this.mtime = mtime.orElse(null); |
| this.inodeId = inodeId.orElse(null); |
| } |
| |
| public HdfsPathHandle(ByteBuffer bytes) throws IOException { |
| if (null == bytes) { |
| throw new IOException("Missing PathHandle"); |
| } |
| HdfsPathHandleProto p = |
| HdfsPathHandleProto.parseFrom(ByteString.copyFrom(bytes)); |
| path = p.getPath(); |
| mtime = p.hasMtime() ? p.getMtime() : null; |
| inodeId = p.hasInodeId() ? p.getInodeId() : null; |
| } |
| |
| public String getPath() { |
| return path; |
| } |
| |
| public void verify(HdfsLocatedFileStatus stat) |
| throws InvalidPathHandleException { |
| if (null == stat) { |
| throw new InvalidPathHandleException("Could not resolve handle"); |
| } |
| if (mtime != null && mtime != stat.getModificationTime()) { |
| throw new InvalidPathHandleException("Content changed"); |
| } |
| if (inodeId != null && inodeId != stat.getFileId()) { |
| throw new InvalidPathHandleException("Wrong file"); |
| } |
| } |
| |
| @Override |
| public ByteBuffer bytes() { |
| HdfsPathHandleProto.Builder b = HdfsPathHandleProto.newBuilder(); |
| b.setPath(path); |
| if (inodeId != null) { |
| b.setInodeId(inodeId); |
| } |
| if (mtime != null) { |
| b.setMtime(mtime); |
| } |
| return b.build().toByteString().asReadOnlyByteBuffer(); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (null == other) { |
| return false; |
| } |
| if (!HdfsPathHandle.class.equals(other.getClass())) { |
| // require exact match |
| return false; |
| } |
| HdfsPathHandle o = (HdfsPathHandle)other; |
| return getPath().equals(o.getPath()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return path.hashCode(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("{ "); |
| sb.append("\"path\" : \"").append(path).append("\""); |
| if (inodeId != null) { |
| sb.append(",\"inodeId\" : ").append(inodeId); |
| } |
| if (mtime != null) { |
| sb.append(",\"mtime\" : ").append(mtime); |
| } |
| sb.append(" }"); |
| return sb.toString(); |
| } |
| |
| } |