hadoop RawPathHandle 源码

haddop RawPathHandle 代码

文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/RawPathHandle.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.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.nio.ByteBuffer;

/**
 * Generic format of FileStatus objects. When the origin is unknown, the
 * attributes of the handle are undefined.
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public final class RawPathHandle implements PathHandle {

  private static final long serialVersionUID = 0x12ba4689510L;

  public static final int MAX_SIZE = 1 << 20;

  private transient ByteBuffer fd;

  /**
   * Store a reference to the given bytes as the serialized form.
   * @param fd serialized bytes
   */
  public RawPathHandle(ByteBuffer fd) {
    this.fd = null == fd
        ? ByteBuffer.allocate(0)
        : fd.asReadOnlyBuffer();
  }

  /**
   * Initialize using a copy of bytes from the serialized handle.
   * @param handle PathHandle to preserve in serialized form.
   */
  public RawPathHandle(PathHandle handle) {
    ByteBuffer hb = null == handle
        ? ByteBuffer.allocate(0)
        : handle.bytes();
    fd = ByteBuffer.allocate(hb.remaining());
    fd.put(hb);
    fd.flip();
  }

  @Override
  public ByteBuffer bytes() {
    return fd.asReadOnlyBuffer();
  }

  @Override
  public boolean equals(Object other) {
    if (!(other instanceof PathHandle)) {
      return false;
    }
    PathHandle o = (PathHandle) other;
    return bytes().equals(o.bytes());
  }

  @Override
  public int hashCode() {
    return bytes().hashCode();
  }

  @Override
  public String toString() {
    return bytes().toString();
  }

  private void writeObject(ObjectOutputStream out) throws IOException {
    out.defaultWriteObject();
    out.writeInt(fd.remaining());
    if (fd.hasArray()) {
      out.write(fd.array(), fd.position(), fd.remaining());
    } else {
      byte[] x = new byte[fd.remaining()];
      fd.slice().get(x);
      out.write(x);
    }
  }

  private void readObject(ObjectInputStream in)
      throws IOException, ClassNotFoundException {
    in.defaultReadObject();
    int len = in.readInt();
    if (len < 0 || len > MAX_SIZE) {
      throw new IOException("Illegal buffer length " + len);
    }
    byte[] x = new byte[len];
    in.readFully(x);
    fd = ByteBuffer.wrap(x);
  }

  private void readObjectNoData() throws ObjectStreamException {
    throw new InvalidObjectException("Stream data required");
  }

}

相关信息

hadoop 源码目录

相关文章

hadoop Abortable 源码

hadoop AbstractFileSystem 源码

hadoop AvroFSInput 源码

hadoop BBPartHandle 源码

hadoop BBUploadHandle 源码

hadoop BatchListingOperations 源码

hadoop BatchedRemoteIterator 源码

hadoop BlockLocation 源码

hadoop BlockStoragePolicySpi 源码

hadoop BufferedFSInputStream 源码