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com.tangosol.io.nio
Class MappedBufferManager

java.lang.Object
com.tangosol.util.Base
com.tangosol.io.nio.AbstractBufferManager
com.tangosol.io.nio.MappedBufferManager

All Implemented Interfaces:

ByteBufferManager

public class MappedBufferManager

extends AbstractBufferManager

Manages a ByteBuffer on a file.

Since:

Coherence 2.2

Author:

cp 2002.09.18

See Also:

ByteBuffer

Field Summary

static int	DEFAULT_MAX_SIZE Default maximum size for a memory mapped file.
static int	DEFAULT_MIN_SIZE Default minimum size for a memory mapped file.

Constructor Summary

MappedBufferManager()
Construct a MappedBufferManager using defaults.

MappedBufferManager(int cbInitial, int cbMaximum, File file)
Construct a MappedBufferManager that supports a buffer of a certain initial and maximum size.

Method Summary

protected void	allocateBuffer() Allocate a new buffer, copying old data if there is any.
void	close() Close the underlying resources.
protected void	configureFile(File file) Configure the buffer manager based on the passed file, which may be null to imply a default temp file, a directory to imply that a file be created in that directory, or it may be the temp file itself.
protected void	finalize() Perform cleanup during garbage collection.
protected RandomAccessFile	getFile() Obtain the RandomAccessFile that the buffer is constructed on.
protected void	setFile(RandomAccessFile file) Specify the RandomAccessFile that the buffer will be constructed on.

Methods inherited from class com.tangosol.io.nio.AbstractBufferManager

calibrate, getBuffer, getCapacity, getGrowthThreshold, getMaxCapacity, getMaxIncrement, getMinCapacity, getShrinkageThreshold, grow, setBuffer, setCapacity, setGrowthThreshold, setMaxCapacity, setMinCapacity, setShrinkageThreshold, shrink

Field Detail

DEFAULT_MIN_SIZE

public static final int DEFAULT_MIN_SIZE

Default minimum size for a memory mapped file.

See Also:

Constant Field Values

DEFAULT_MAX_SIZE

public static final int DEFAULT_MAX_SIZE

Default maximum size for a memory mapped file.

See Also:

Constant Field Values

Constructor Detail

MappedBufferManager

public MappedBufferManager()

Construct a MappedBufferManager using defaults.

MappedBufferManager

public MappedBufferManager(int cbInitial,
                           int cbMaximum,
                           File file)

Construct a MappedBufferManager that supports a buffer of a certain initial and maximum size.

Parameters:

cbInitial - the initial size

cbMaximum - the maximum size

file - the file to use, or the directory to use, or null to generate a temporary file in the default location

Method Detail

configureFile

protected void configureFile(File file)

Configure the buffer manager based on the passed file, which may be null to imply a default temp file, a directory to imply that a file be created in that directory, or it may be the temp file itself.

Parameters:

file - the file to use, or the directory to use, or null to generate a temporary file in the default location

getFile

protected RandomAccessFile getFile()

Obtain the RandomAccessFile that the buffer is constructed on.

Returns:

the RandomAccessFile object

setFile

protected void setFile(RandomAccessFile file)

Specify the RandomAccessFile that the buffer will be constructed on.

Parameters:

file - the RandomAccessFile object

allocateBuffer

protected void allocateBuffer()

Allocate a new buffer, copying old data if there is any.

Specified by:

allocateBuffer in class AbstractBufferManager

See Also:

FileChannel.map()

close

public void close()

Close the underlying resources.

finalize

protected void finalize()

Perform cleanup during garbage collection.

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