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Mongoose is a high-load storage performance testing tool

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package com.emc.mongoose.api.model.item;

import com.emc.mongoose.api.model.data.DataInput;
import com.emc.mongoose.api.model.data.DataCorruptionException;
import com.emc.mongoose.api.model.data.DataSizeException;

import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.ClosedByInterruptException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.NonWritableChannelException;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.BitSet;

/**
 Created by kurila on 11.07.16.
 */
public interface DataItem
extends Item, SeekableByteChannel {
	
	double LOG2 = Math.log(2);
	
	DataInput getDataInput();
	
	void setDataInput(final DataInput dataInput);
	
	void reset();
	
	int layer();

	void layer(final int layerNum);
	
	void size(final long size);
	
	long offset();
	
	void offset(final long offset);

	 D slice(final long from, final long size);
	
	/**
	 * @return The number of bytes written, possibly zero
	 * @throws NonWritableChannelException
	 *          If this channel was not opened for writing
	 * @throws ClosedChannelException
	 *          If this channel is closed
	 * @throws AsynchronousCloseException
	 *          If another thread closes this channel
	 *          while the write operation is in progress
	 * @throws ClosedByInterruptException
	 *          If another thread interrupts the current thread
	 *          while the write operation is in progress, thereby
	 *          closing the channel and setting the current thread's
	 *          interrupt status
	 * @throws  IOException
	 *          If some other I/O error occurs
	 */
	int write(final WritableByteChannel chanDst, final long maxCount)
	throws IOException;
	
	int readAndVerify(final ReadableByteChannel chanSrc, final MappedByteBuffer buff)
	throws DataSizeException, DataCorruptionException, IOException;
	
	static int getRangeCount(final long size) {
		return (int) Math.ceil(Math.log(size + 1) / LOG2);
	}
	
	static long getRangeOffset(final int i) {
		return (1 << i) - 1;
	}
	
	long getRangeSize(int rangeIdx);
	
	boolean isUpdated();
	
	boolean isRangeUpdated(final int rangeIdx);
	
	int getUpdatedRangesCount();
	
	void commitUpdatedRanges(final BitSet[] updatingRangesMask);
}