Slicing and Dicing Data with Type-Specific Buffer Classes in Java
This document explores the implementation of type-specific buffer classes in Java, specifically focusing on BooleanBuf, ByteBuf, CharacterBuf, and others. It demonstrates how these classes act as wrappers for primitive values or objects, all implementing Serializable. Through various examples, it illustrates how to create and manipulate buffers, including single item buffers, array buffers, and matrix buffers. The document also discusses specialized slicing and partitioning techniques for rows and columns, enhancing data communication efficiency in applications.
Slicing and Dicing Data with Type-Specific Buffer Classes in Java
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Presentation Transcript
Computer Science 320 Slicing and Dicing Data with Buffers
Type-Specific Buffer Classes • edu.rit.BooleanBuf • edu.rit.ByteBuf • edu.rit.CharacterBuf • edu.rit.DoubleBuf • edu.rit.FloatBuf • edu.rit.IntegerBuf • edu.rit.LongBuf • edu.rit.ShortBuf • edu.rit.ObjectBuf These are wrappers for primitive values or objects They all implement Serializable
Example: A Single Item Integer Buffer IntegerItemBufbuf = IntegerBuf.buffer(); buf.item = 42; System.out.println(buf.item);
Example: An Integer Array Buffer int[] data = new int[8]; IntegerBufbuf = IntegerBuf.buffer(data);
Example: An Array Slice int[] data = new int[8]; Range sliceRange = new Range(2, 4); IntegerBufbuf = IntegerBuf.buffer(data, sliceRange);
Example: Range Stride > 1 int[] data = new int[8]; Range evenRange = new Range(0, 6, 2); IntegerBufbuf = IntegerBuf.buffer(data, evenRange);
Example: Partitioning an Array int[] data = new int[8]; Range[] sliceRanges = new Range(0, 7).subranges(4); IntegerBuf[] sliceBufs = IntegerBuf.sliceBuffers(data, sliceRanges);
Example: An Integer Matrix Buffer int[] data = new int[4][8]; IntegerBufbuf = IntegerBuf.buffer(data); Data are written to and read from the communication buffer in row-major order
Example: A Matrix Row Slice int[] data = new int[4][8]; Range rowRange = new Range(2, 3); IntegerBufbuf = IntegerBuf.rowSliceBuffer(data, rowRange); Only the data values in the row range are transferred through the buffer
Example: A Matrix Column Slice int[] data = new int[4][8]; Range colRange = new Range(2, 4); IntegerBufbuf = IntegerBuf.colSliceBuffer(data, colRange); Only the data values in the column range are transferred through the buffer
Example: A Matrix Patch (Rows and Columns) int[] data = new int[4][8]; Range rowRange = new Range(1, 2); Range colRange = new Range(4, 5); IntegerBufbuf = IntegerBuf.patchBuffer(data, colRange); Only the data values in the matrix “patch” are transferred through the buffer
Example: Matrix Partition by Rows int[] data = new int[4][8]; Range[] rowRanges = new Range(0, 3).subranges(4); IntegerBufrowBufs = IntegerBuf.rowSliceBuffers(data, rowRanges); Used as source in scatter and destination in gather operations
Example: Matrix Partition by Columns int[] data = new int[4][8]; Range[] colRanges = new Range(0, 7).subranges(4); IntegerBufcolBufs = IntegerBuf.colSliceBuffers(data, colRanges); Used as source in scatter and destination in gather operations
Example: Matrix Partition by Patches int[] data = new int[4][8]; Range[] rowRanges = new Range(0, 3).subranges(2); Range[] colRanges = new Range(0, 7).subranges(2); IntegerBufpatchBufs = IntegerBuf.patchBuffers(data, rowRanges, colRanges); Used as source in scatter and destination in gather operations
