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Common utilities shared in Alluxio core modules

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.file;

import io.netty.buffer.ByteBuf;

import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;

/**
 * TargetBuffer for zero-copy read from page store.
 */
public interface ReadTargetBuffer {

  /**
   * @return the byte array
   */
  byte[] byteArray();

  /**
   *
   * @return the byte buffer
   */
  ByteBuffer byteBuffer();

  /**
   * @return offset in the buffer
   */
  int offset();

  /**
   * Sets the new offset in the buffer.
   *
   * @param newOffset the new offset
   */
  void offset(int newOffset);

  /**
   * @return the writable channel
   */
  WritableByteChannel byteChannel();

  /**
   * @return the remaining for this buffer
   */
  long remaining();

  /**
   * @param srcArray
   * @param srcOffset
   * @param length
   */
  void writeBytes(byte[] srcArray, int srcOffset, int length);

  /**
   * @param buf
   */
  void writeBytes(ByteBuf buf);

  /**
   * @param file
   * @param length
   * @return bytes read from the file
   */
  int readFromFile(RandomAccessFile file, int length) throws IOException;

  /**
   * @param is
   * @param length
   * @return bytes read from input stream
   * @throws IOException
   */
  int readFromInputStream(InputStream is, int length) throws IOException;
}