equip.runtime
Class Mbuf

java.lang.Object
  equip.runtime.Mbuf

public class Mbuf

extends java.lang.Object

message(byte) buffer used by MbufInputStream and MbufOutputStream. NB be careful not to re-use in parallel if making use of ref counting.

Field Summary

protected byte[]	buf internal buffer
static int	DEFAULT_SIZE Default buffer size (1000)
protected int	headerSize amount of internal buffer allocated to header space
protected Mbuf	next pointer to next Mbuf in single linked list
protected int	size total size of internal buffer in use
protected int	used amount of internal buffer in use

Constructor Summary

Mbuf()
initialise to DEFAULT_SIZE and no header

Mbuf(int size, int headerSize)
initialise to specified total and header size.

Method Summary

byte[]	getBuf() get reference to internal buffer.
int	getHeaderSize() get size of buffer header space.
Mbuf	getNext() single linked list.
int	getSize() get total size of buffer.
int	getUsed() get number of bytes in use.
void	setData(byte[] b, int length) set internal buffer
void	setHeaderSize(int size) set size of buffer header space.
void	setNext(Mbuf next) set next buffer in single linked list.
void	setUsed(int used) set number of bytes in use.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_SIZE

public static final int DEFAULT_SIZE

Default buffer size (1000)

See Also:

Constant Field Values

buf

protected byte[] buf

internal buffer

used

protected int used

amount of internal buffer in use

size

protected int size

total size of internal buffer in use

headerSize

protected int headerSize

amount of internal buffer allocated to header space

next

protected Mbuf next

pointer to next Mbuf in single linked list

Constructor Detail

Mbuf

public Mbuf()

initialise to DEFAULT_SIZE and no header

Mbuf

public Mbuf(int size,
            int headerSize)

initialise to specified total and header size.

Parameters:

size - Total size of buffer.

headerSize - Amount of buffer to be allocated as header

Method Detail

getNext

public Mbuf getNext()

single linked list.

Returns:

Next buffer in single linked list

setNext

public void setNext(Mbuf next)

set next buffer in single linked list.

Parameters:

next - Next buffer in single linked list.

getUsed

public int getUsed()

get number of bytes in use.

Returns:

number of bytes in use.

setUsed

public void setUsed(int used)

set number of bytes in use.

Parameters:

used - Number of bytes now used.

getSize

public int getSize()

get total size of buffer.

Returns:

total size of buffer.

getBuf

public byte[] getBuf()

get reference to internal buffer.

Returns:

Reference to internal buffer (not a copy of the buffer).

getHeaderSize

public int getHeaderSize()

get size of buffer header space.

Returns:

Amount of buffer allocated to header.

setHeaderSize

public void setHeaderSize(int size)

set size of buffer header space.

Parameters:

size - New amount of buffer to be allocated as header.

setData

public void setData(byte[] b,
                    int length)

set internal buffer

Parameters:

length - amount of buffer used