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/**
 * Copyright 2004 - 2021 anaptecs GmbH, Burgstr. 96, 72764 Reutlingen, Germany
 *
 * All rights reserved.
 */
package com.anaptecs.jeaf.workload.proxy;

import java.nio.ByteBuffer;
import java.util.Arrays;

import com.anaptecs.jeaf.xfun.api.checks.Check;

import stormpot.Poolable;
import stormpot.Slot;

public class PoolableByteBuffer implements Poolable {
  /**
   * Location inside a pool where this instance is stored.
   */
  private final Slot slot;

  private final ByteBuffer byteBuffer;

  public PoolableByteBuffer( int pSize, Slot pSlot ) {
    byteBuffer = ByteBuffer.allocate(pSize);
    slot = pSlot;
  }

  public PoolableByteBuffer( ByteBuffer pByteBuffer, Slot pSlot ) {
    // Check parameter.
    Check.checkInvalidParameterNull(pByteBuffer, "pByteBuffer");

    byteBuffer = pByteBuffer;
    slot = pSlot;
  }

  public ByteBuffer getByteBuffer( ) {
    return byteBuffer;
  }

  public Slot getSlot( ) {
    return slot;
  }

  @Override
  public void release( ) {
    // Clear content. For security reasons we also have to clear the content of the byte array even though it might cost
    // some very small amount of time.
    Arrays.fill(byteBuffer.array(), (byte) 0);
    byteBuffer.clear();

    // Return byte array back to pool
    if (slot != null) {
      slot.release(this);
    }
  }
}