Package org.jcsp.util.ints

Class BufferInt

java.lang.Object

org.jcsp.util.ints.BufferInt

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ChannelDataStoreInt

public class BufferInt
extends java.lang.Object
implements ChannelDataStoreInt, java.io.Serializable

This is used to create a buffered integer channel that never loses data.

Description

BufferInt is an implementation of ChannelDataStoreInt that yields a blocking FIFO buffered semantics for a channel. See the static construction methods of Channel (Channel.one2oneInt(org.jcsp.util.ints.ChannelDataStoreInt) etc.).

The getState method returns EMPTY, NONEMPTYFULL or FULL according to the state of the buffer.

See Also:

ZeroBufferInt, OverWriteOldestBufferInt, OverWritingBufferInt, OverFlowingBufferInt, InfiniteBufferInt, ChannelInt, Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private int[]	buffer	The storage for the buffered ints
private int	counter	The number of ints stored in the BufferInt
private int	firstIndex	The index of the oldest element (when counter > 0)
private int	lastIndex	The index of the next free element (when counter < buffer.length)

Fields inherited from interface org.jcsp.util.ints.ChannelDataStoreInt

EMPTY, FULL, NONEMPTYFULL

Constructor Summary

Constructors

Constructor	Description
BufferInt(int size)	Construct a new BufferInt with the specified size.

Method Summary

Modifier and Type	Method	Description
java.lang.Object	clone()	Returns a new (and EMPTY) BufferInt with the same creation parameters as this one.
void	endGet()	Removes the oldest integer from the buffer.
int	get()	Returns the oldest int from the BufferInt and removes it.
int	getState()	Returns the current state of the BufferInt.
void	put(int value)	Puts a new int into the BufferInt.
void	removeAll()
int	startGet()	Returns the oldest integer from the buffer but does not remove it.

Methods inherited from class java.lang.Object

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

Field Detail

buffer

private final int[] buffer

The storage for the buffered ints

counter

private int counter

The number of ints stored in the BufferInt

firstIndex

private int firstIndex

The index of the oldest element (when counter > 0)

lastIndex

private int lastIndex

The index of the next free element (when counter < buffer.length)

Constructor Detail

BufferInt

public BufferInt(int size)

Construct a new BufferInt with the specified size.

Parameters:

size - the number of ints the BufferInt can store.

Throws:

BufferIntSizeError - if size is negative. Note: no action should be taken to try/catch this exception - application code generating it is in error and needs correcting.

Method Detail

get

public int get()

Returns the oldest int from the BufferInt and removes it.

Pre-condition: getState must not currently return EMPTY.

Specified by:

get in interface ChannelDataStoreInt

Returns:

the oldest int from the BufferInt

startGet

public int startGet()

Returns the oldest integer from the buffer but does not remove it. Pre-condition: getState must not currently return EMPTY.

Specified by:

startGet in interface ChannelDataStoreInt

Returns:

the oldest int from the Buffer

See Also:

ChannelDataStoreInt.endGet()

endGet

public void endGet()

Removes the oldest integer from the buffer.

Specified by:

endGet in interface ChannelDataStoreInt

See Also:

ChannelDataStoreInt.startGet()

put

public void put(int value)

Puts a new int into the BufferInt.

Pre-condition: getState must not currently return FULL.

Specified by:

put in interface ChannelDataStoreInt

Parameters:

value - the int to put into the BufferInt

getState

public int getState()

Returns the current state of the BufferInt.

Specified by:

getState in interface ChannelDataStoreInt

Returns:

the current state of the BufferInt (EMPTY, NONEMPTYFULL or FULL)

clone

public java.lang.Object clone()

Returns a new (and EMPTY) BufferInt with the same creation parameters as this one.

Note: Only the size and structure of the BufferInt is cloned, not any stored data.

Specified by:

clone in interface ChannelDataStoreInt

Overrides:

clone in class java.lang.Object

Returns:

the cloned instance of this BufferInt

removeAll

public void removeAll()

Specified by:

removeAll in interface ChannelDataStoreInt