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/*
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 * SciJava Common shared library for SciJava software.
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 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
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package org.scijava.io.nio;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import org.scijava.service.SciJavaService;

/**
 * Interface for services that work with the {@link java.nio} package,
 * particularly NIO {@link ByteBuffer} objects.
 * 
 * @author Chris Allan
 * @author Curtis Rueden
 */
public interface NIOService extends SciJavaService {

	/**
	 * Allocates or maps the desired file data into memory.
	 * 
	 * This method provides a facade to byte buffer allocation that enables
	 * FileChannel.map() usage on platforms where it's unlikely to
	 * give us problems and heap allocation where it is.
	 * 
	 * 
	 * @param channel File channel to allocate or map byte buffers from.
	 * @param mapMode The map mode. Required but only used if memory mapped I/O is
	 *          to occur.
	 * @param bufferStartPosition The absolute position of the start of the
	 *          buffer.
	 * @param newSize The buffer size.
	 * @return A newly allocated or mapped NIO byte buffer.
	 * @see "http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5092131"
	 * @see "http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6417205"
	 * @throws IOException If there is an issue mapping, aligning or allocating
	 *           the buffer.
	 */
	ByteBuffer allocate(FileChannel channel, MapMode mapMode,
		long bufferStartPosition, int newSize) throws IOException;

}