org.jcsp.util.ints

Class ZeroBufferInt

java.lang.Object

org.jcsp.util.ints.ZeroBufferInt

All Implemented Interfaces:

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

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

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

Description

ZeroBufferInt is an implementation of ChannelDataStoreInt that yields the standard CSP semantics for a channel -- that is zero buffered with direct synchronisation between reader and writer. Unless specified otherwise, this is the default behaviour for channels. See the static construction methods of Channel (Channel.one2oneInt(org.jcsp.util.ints.ChannelDataStoreInt) etc.).

The getState method will return FULL if there is an output waiting on the channel and EMPTY if there is not.

See Also:

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

Field Summary

Fields

Modifier and Type	Field and Description
private int	state The current state
private int	value The int

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

EMPTY, FULL, NONEMPTYFULL

Constructor Summary

Constructors

Constructor and Description
ZeroBufferInt()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone() Returns a new (and EMPTY) ZeroBufferInt with the same creation parameters as this one.
void	endGet() Ends the extended rendezvous by clearing the buffer.
int	get() Returns the int from the ZeroBufferInt.
int	getState() Returns the current state of the ZeroBufferInt.
void	put(int value) Puts a new int into the ZeroBufferInt.
void	removeAll()
int	startGet() Begins an extended rendezvous - simply returns the next integer in the buffer.

Methods inherited from class java.lang.Object

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

Field Detail

state

private int state

The current state

value

private int value

The int

Constructor Detail

ZeroBufferInt

public ZeroBufferInt()

Method Detail

get

public int get()

Returns the int from the ZeroBufferInt.

Pre-condition: getState must not currently return EMPTY.

Specified by:

get in interface ChannelDataStoreInt

Returns:

the int from the ZeroBufferInt

startGet

public int startGet()

Begins an extended rendezvous - simply returns the next integer in the buffer. This function does not remove the integer. Pre-condition: getState must not currently return EMPTY.

Specified by:

startGet in interface ChannelDataStoreInt

Returns:

The integer in the buffer.

See Also:

ChannelDataStoreInt.endGet()

endGet

public void endGet()

Ends the extended rendezvous by clearing the buffer.

Specified by:

endGet in interface ChannelDataStoreInt

See Also:

ChannelDataStoreInt.startGet()

put

public void put(int value)

Puts a new int into the ZeroBufferInt.

Pre-condition: getState must not currently return FULL.

Specified by:

put in interface ChannelDataStoreInt

Parameters:

value - the int to put into the ZeroBufferInt

getState

public int getState()

Returns the current state of the ZeroBufferInt.

Specified by:

getState in interface ChannelDataStoreInt

Returns:

the current state of the ZeroBufferInt (EMPTY or FULL)

clone

public java.lang.Object clone()

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

Note: Only the size and structure of the ZeroBufferInt 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 ZeroBufferInt.

removeAll

public void removeAll()

Specified by:

removeAll in interface ChannelDataStoreInt