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com.tangosol.io.nio
Interface ByteBufferManager

All Known Implementing Classes:

AbstractBufferManager, DirectBufferManager, MappedBufferManager

public interface ByteBufferManager

An interface for managing a ByteBuffer.

Since:

Coherence 2.2

Author:

cp 2002.09.16

Method Summary

java.nio.ByteBuffer	getBuffer() Get the current ByteBuffer reference.
int	getCapacity() Get the capacity of the current ByteBuffer.
int	getGrowthThreshold() Determine the level (what number of bytes used) above which the current ByteBuffer will need to be "resized" upwards.
int	getMaxCapacity() Determine the maximum size that the managed buffer can reach.
int	getMinCapacity() Determine the minimum size that the managed buffer can reach.
int	getShrinkageThreshold() Determine the level (what number of bytes used) below which the current ByteBuffer will need to be "resized" downwards.
void	grow(int cbRequired) Request that the buffer be grown based on the number of bytes currently required.
void	shrink(int cbRequired) Request that the buffer be shrunk based on the number of bytes currently required.

Method Detail

getBuffer

java.nio.ByteBuffer getBuffer()

Get the current ByteBuffer reference.

Returns:

the current ByteBuffer

getCapacity

int getCapacity()

Get the capacity of the current ByteBuffer. This is the same as getBuffer().capacity().

Returns:

the capacity of the current ByteBuffer

getGrowthThreshold

int getGrowthThreshold()

Determine the level (what number of bytes used) above which the current ByteBuffer will need to be "resized" upwards. Returns Integer.MAX_VALUE if the buffer cannot be resized upwards.

Returns:

the number of bytes that, when the number of used bytes exceeds it, the ByteBuffer will need to grow

getShrinkageThreshold

int getShrinkageThreshold()

Determine the level (what number of bytes used) below which the current ByteBuffer will need to be "resized" downwards. Returns 0 if the buffer cannot be resized downwards.

Returns:

the number of bytes that, when the number of used bytes drops below it, the ByteBuffer will need to shrink

getMinCapacity

int getMinCapacity()

Determine the minimum size that the managed buffer can reach. If the buffer is already at its minimum, then this method will return the same value as getCapacity.

Returns:

minimum size for the managed buffer

getMaxCapacity

int getMaxCapacity()

Determine the maximum size that the managed buffer can reach. If the buffer is already at its maximum, then this method will return the same value as getCapacity.

Returns:

maximum size for the managed buffer

grow

void grow(int cbRequired)

Request that the buffer be grown based on the number of bytes currently required.

Parameters:

cbRequired - the number of bytes that are needed by the requesting operation

shrink

void shrink(int cbRequired)

Request that the buffer be shrunk based on the number of bytes currently required.

Parameters:

cbRequired - the number of contiguous bytes in the buffer, starting from offset 0, that are actually in use

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