hadoop LocalFileSystemPathHandle 源码
haddop LocalFileSystemPathHandle 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/LocalFileSystemPathHandle.java
/*
* 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.fs;
import org.apache.hadoop.thirdparty.protobuf.ByteString;
import org.apache.hadoop.fs.FSProtos.LocalFileSystemPathHandleProto;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Objects;
import java.util.Optional;
/**
* Opaque handle to an entity in a FileSystem.
*/
public class LocalFileSystemPathHandle implements PathHandle {
private final String path;
private final Long mtime;
public LocalFileSystemPathHandle(String path, Optional<Long> mtime) {
this.path = path;
this.mtime = mtime.orElse(null);
}
public LocalFileSystemPathHandle(ByteBuffer bytes) throws IOException {
if (null == bytes) {
throw new IOException("Missing PathHandle");
}
LocalFileSystemPathHandleProto p =
LocalFileSystemPathHandleProto.parseFrom(ByteString.copyFrom(bytes));
path = p.hasPath() ? p.getPath() : null;
mtime = p.hasMtime() ? p.getMtime() : null;
}
public String getPath() {
return path;
}
public void verify(FileStatus stat) throws InvalidPathHandleException {
if (null == stat) {
throw new InvalidPathHandleException("Could not resolve handle");
}
if (mtime != null && mtime != stat.getModificationTime()) {
throw new InvalidPathHandleException("Content changed");
}
}
@Override
public ByteBuffer bytes() {
LocalFileSystemPathHandleProto.Builder b =
LocalFileSystemPathHandleProto.newBuilder();
b.setPath(path);
if (mtime != null) {
b.setMtime(mtime);
}
return b.build().toByteString().asReadOnlyByteBuffer();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
LocalFileSystemPathHandle that = (LocalFileSystemPathHandle) o;
return Objects.equals(path, that.path) &&
Objects.equals(mtime, that.mtime);
}
@Override
public int hashCode() {
return Objects.hash(path, mtime);
}
@Override
public String toString() {
return "LocalFileSystemPathHandle{" +
"path='" + path + '\'' +
", mtime=" + mtime +
'}';
}
}
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