Package org.jcsp.util.ints
Class InfiniteBufferInt
- java.lang.Object
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- org.jcsp.util.ints.InfiniteBufferInt
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,ChannelDataStoreInt
public class InfiniteBufferInt extends java.lang.Object implements ChannelDataStoreInt, java.io.Serializable
This is used to create a buffered integer channel that always accepts and never loses any input.Description
InfiniteBufferInt is an implementation of ChannelDataStoreInt that yields a FIFO buffered semantics for a channel. When empty, the channel blocks readers. However, its capacity is infinite (expanding to whatever is needed so far as the underlying memory system will permit). So, it never gets full and blocks a writer. See the static construction methods ofChannel
(Channel.one2oneInt(org.jcsp.util.ints.ChannelDataStoreInt)
etc.).The getState method returns EMPTY or NONEMPTYFULL, but never FULL.
An initial size for the buffer can be specified during construction.
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Field Summary
Fields Modifier and Type Field Description private int[]
buffer
The storage for the buffered intsprivate int
counter
The number of ints stored in the InfiniteBufferIntprivate static int
DEFAULT_SIZE
The default size of the bufferprivate int
firstIndex
The index of the oldest element (when counter > 0)private int
initialSize
The initial size of the bufferprivate 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
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Constructor Summary
Constructors Constructor Description InfiniteBufferInt()
Construct a new InfiniteBufferInt with the default size (of 8).InfiniteBufferInt(int initialSize)
Construct a new InfiniteBufferInt with the specified initial size.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
clone()
Returns a new (and EMPTY) InfiniteBufferInt 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 InfiniteBufferInt and removes it.int
getState()
Returns the current state of the InfiniteBufferInt.void
put(int value)
Puts a new int into the InfiniteBufferInt.void
removeAll()
int
startGet()
Returns the oldest integer from the buffer but does not remove it.
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Field Detail
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DEFAULT_SIZE
private static final int DEFAULT_SIZE
The default size of the buffer- See Also:
- Constant Field Values
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initialSize
private int initialSize
The initial size of the buffer
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buffer
private int[] buffer
The storage for the buffered ints
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counter
private int counter
The number of ints stored in the InfiniteBufferInt
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firstIndex
private int firstIndex
The index of the oldest element (when counter > 0)
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lastIndex
private int lastIndex
The index of the next free element (when counter < buffer.length)
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Constructor Detail
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InfiniteBufferInt
public InfiniteBufferInt()
Construct a new InfiniteBufferInt with the default size (of 8).
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InfiniteBufferInt
public InfiniteBufferInt(int initialSize)
Construct a new InfiniteBufferInt with the specified initial size.- Parameters:
initialSize
- the number of ints the InfiniteBufferInt can initially store.- Throws:
BufferIntSizeError
- if initialSize 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.
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Method Detail
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get
public int get()
Returns the oldest int from the InfiniteBufferInt and removes it.Pre-condition: getState must not currently return EMPTY.
- Specified by:
get
in interfaceChannelDataStoreInt
- Returns:
- the oldest int from the InfiniteBufferInt
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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 interfaceChannelDataStoreInt
- Returns:
- the oldest int from the Buffer
- See Also:
ChannelDataStoreInt.endGet()
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endGet
public void endGet()
Removes the oldest integer from the buffer.- Specified by:
endGet
in interfaceChannelDataStoreInt
- See Also:
ChannelDataStoreInt.startGet()
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put
public void put(int value)
Puts a new int into the InfiniteBufferInt.Implementation note: if InfiniteBufferInt is full, a new internal buffer with double the capacity is constructed and the old data copied across.
- Specified by:
put
in interfaceChannelDataStoreInt
- Parameters:
value
- the int to put into the InfiniteBufferInt
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getState
public int getState()
Returns the current state of the InfiniteBufferInt.- Specified by:
getState
in interfaceChannelDataStoreInt
- Returns:
- the current state of the InfiniteBufferInt (EMPTY or NONEMPTYFULL)
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clone
public java.lang.Object clone()
Returns a new (and EMPTY) InfiniteBufferInt with the same creation parameters as this one.Note: Only the initial size and structure of the InfiniteBufferInt is cloned, not any stored data.
- Specified by:
clone
in interfaceChannelDataStoreInt
- Overrides:
clone
in classjava.lang.Object
- Returns:
- the cloned instance of this InfiniteBufferInt.
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removeAll
public void removeAll()
- Specified by:
removeAll
in interfaceChannelDataStoreInt
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