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Mongoose is a high-load storage performance testing tool

There is a newer version: 4.3.10

package com.emc.mongoose.base.item;

import com.emc.mongoose.base.data.DataCorruptionException;
import com.emc.mongoose.base.data.DataInput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.ClosedByInterruptException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.NonWritableChannelException;
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 dataInput();

	void dataInput(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
	*/
	long writeToSocketChannel(final WritableByteChannel chanDst, final long maxCount)
					throws IOException;

	long writeToFileChannel(final FileChannel chanDst, final long maxCount) throws IOException;

	void verify(final ByteBuffer inBuff) throws DataCorruptionException;

	static int rangeCount(final long size) {
		return (int) Math.ceil(Math.log(size + 1) / LOG2);
	}

	static long rangeOffset(final int i) {
		return (1 << i) - 1;
	}

	long rangeSize(int rangeIdx);

	boolean isUpdated();

	boolean isRangeUpdated(final int rangeIdx);

	int updatedRangesCount();

	void commitUpdatedRanges(final BitSet[] updatingRangesMask);
}