/*
 * Created on 31-Jul-2004
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package org.gudy.azureus2.core3.disk.impl.access;

import org.gudy.azureus2.core3.disk.DiskManagerReadRequest;
import org.gudy.azureus2.core3.disk.DiskManagerReadRequestListener;
import org.gudy.azureus2.core3.util.DirectByteBuffer;


/**
 * @author parg
 *
 */

public interface 
DMReader 
{
	public void
	start();
	
	public void
	stop();
	
	public DirectByteBuffer 
	readBlock(
		int pieceNumber, 
		int offset, 
		int length );

	public DiskManagerReadRequest
	createReadRequest(
		int pieceNumber,
		int offset,
		int length );
	
	public void 
	readBlock( 
		DiskManagerReadRequest 			request, 
		DiskManagerReadRequestListener 	listener );
	
	public boolean
	hasOutstandingReadRequestForPiece(
		int		piece_number );
	
		/**
		 * 2 entries, first = read-ops, second = read-bytes
		 * @return
		 */
	
	public long[]
	getStats();
}
