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.

See Also:

  • Field Summary

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

    Fields inherited from interface ChannelDataStoreInt

    EMPTY, FULL, NONEMPTYFULL

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    Description
    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 Object

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

  • Field Details

    • buffer

      private final int[] buffer
      The storage for the buffered ints

    • counter

      private int counter
      The number of ints stored in the Buffer

    • 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 invalid input: '<' buffer.length)

  • Constructor Details

    • 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 Details

    • 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:

    • endGet

      public void endGet()
      Removes the oldest integer from the buffer.
      Specified by:
      endGet in interface ChannelDataStoreInt
      See Also:

    • 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