edu.rit.mp.buf
Class SharedLongArrayBuf_1

java.lang.Object
  edu.rit.mp.Buf
      edu.rit.mp.LongBuf
          edu.rit.mp.buf.SharedLongArrayBuf
              edu.rit.mp.buf.SharedLongArrayBuf_1

public class SharedLongArrayBuf_1
extends SharedLongArrayBuf

Class SharedLongArrayBuf_1 provides a buffer for a multiple thread safe array of long items sent or received using the Message Protocol (MP). The array element stride must be 1. While an instance of class SharedLongArrayBuf_1 may be constructed directly, normally you will use a factory method in class LongBuf. See that class for further information.

Field Summary

Fields inherited from class edu.rit.mp.Buf

myLength

Constructor Summary

SharedLongArrayBuf_1(SharedLongArray theArray, Range theRange)
Construct a new shared long array buffer.

Method Summary

long	get(int i) Obtain the given item from this buffer.
Buf	getReductionBuf(Op op) Create a buffer for performing parallel reduction using the given binary operation.
void	put(int i, long item) Store the given item in this buffer.
protected int	receiveItems(int i, int num, ByteBuffer buffer) Receive as many items as possible from the given byte buffer to this buffer.
protected int	sendItems(int i, ByteBuffer buffer) Send as many items as possible from this buffer to the given byte buffer.

Methods inherited from class edu.rit.mp.LongBuf

buffer, buffer, buffer, buffer, buffer, buffer, colSliceBuffer, colSliceBuffers, copy, defaultCopy, emptyBuffer, fill, getTemporaryBuf, patchBuffer, patchBuffers, rowSliceBuffer, rowSliceBuffers, sliceBuffer, sliceBuffer, sliceBuffers, sliceBuffers

Methods inherited from class edu.rit.mp.Buf

length

Methods inherited from class java.lang.Object

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

Constructor Detail

SharedLongArrayBuf_1

public SharedLongArrayBuf_1(SharedLongArray theArray,
                            Range theRange)

Construct a new shared long array buffer.

Parameters:

theArray - Shared array.

theRange - Range of array elements to include in the buffer. The stride is assumed to be 1.

Method Detail

get

public long get(int i)

Obtain the given item from this buffer.

The get() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Overrides:

get in class SharedLongArrayBuf

Parameters:

i - Item index in the range 0 .. length()-1.

Returns:

Item at index i.

put

public void put(int i,
                long item)

Store the given item in this buffer.

The put() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Overrides:

put in class SharedLongArrayBuf

Parameters:

i - Item index in the range 0 .. length()-1.

item - Item to be stored at index i.

getReductionBuf

public Buf getReductionBuf(Op op)

Create a buffer for performing parallel reduction using the given binary operation. The results of the reduction are placed into this buffer.

Overrides:

getReductionBuf in class SharedLongArrayBuf

Parameters:

op - Binary operation.

Throws:

ClassCastException - (unchecked exception) Thrown if this buffer's element data type and the given binary operation's argument data type are not the same.

sendItems

protected int sendItems(int i,
                        ByteBuffer buffer)

Send as many items as possible from this buffer to the given byte buffer.

The sendItems() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Overrides:

sendItems in class SharedLongArrayBuf

Parameters:

i - Index of first item to send, in the range 0 .. length-1.

buffer - Byte buffer.

Returns:

Number of items sent.

receiveItems

protected int receiveItems(int i,
                           int num,
                           ByteBuffer buffer)

Receive as many items as possible from the given byte buffer to this buffer.

The receiveItems() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Overrides:

receiveItems in class SharedLongArrayBuf

Parameters:

i - Index of first item to receive, in the range 0 .. length-1.

num - Maximum number of items to receive.

buffer - Byte buffer.

Returns:

Number of items received.