org.jcsp.util.ints
Class OverFlowingBufferInt

java.lang.Object
  org.jcsp.util.ints.OverFlowingBufferInt

All Implemented Interfaces:

Serializable, Cloneable, ChannelDataStoreInt

public class OverFlowingBufferInt
extends Object
implements ChannelDataStoreInt, Serializable

This is used to create a buffered integer channel that always accepts input, discarding its last entered data if full.

Description

OverFlowingBufferInt is an implementation of ChannelDataStoreInt that yields a FIFO buffered semantics for a channel. When empty, the channel blocks readers. When full, a writer will be accepted but the written value overflows the buffer and is lost to the channel. See the static construction methods of Channel (Channel.one2oneInt(org.jcsp.util.ints.ChannelDataStoreInt) etc.).

The getState method returns EMPTY or NONEMPTYFULL, but never FULL.

Author:

P.D. Austin

See Also:

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

Field Summary

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

EMPTY, FULL, NONEMPTYFULL

Constructor Summary

OverFlowingBufferInt(int size)
Construct a new OverFlowingBufferInt with the specified size.

Method Summary

Object	clone() Returns a new (and EMPTY) OverFlowingBufferInt 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 OverFlowingBufferInt and removes it.
int	getState() Returns the current state of the OverFlowingBufferInt.
void	put(int value) Puts a new int into the OverFlowingBufferInt.
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

Constructor Detail

OverFlowingBufferInt

public OverFlowingBufferInt(int size)

Construct a new OverFlowingBufferInt with the specified size.

Parameters:

size - the number of ints the OverFlowingBufferInt can store.

Throws:

BufferIntSizeError - if size is zero or 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 OverFlowingBufferInt and removes it.

Pre-condition: getState must not currently return EMPTY.

Specified by:

get in interface ChannelDataStoreInt

Returns:

the oldest int from the OverFlowingBufferInt

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 OverFlowingBufferInt.

If OverFlowingBufferInt is full, the item is discarded.

Specified by:

put in interface ChannelDataStoreInt

Parameters:

value - the int to put into the OverFlowingBufferInt

getState

public int getState()

Returns the current state of the OverFlowingBufferInt.

Specified by:

getState in interface ChannelDataStoreInt

Returns:

the current state of the OverFlowingBufferInt (EMPTY or NONEMPTYFULL)

clone

public Object clone()

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

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

Specified by:

clone in interface ChannelDataStoreInt

Overrides:

clone in class Object

Returns:

the cloned instance of this OverFlowingBufferInt.

removeAll

public void removeAll()

Specified by:

removeAll in interface ChannelDataStoreInt