Package org.apache.accumulo.core.util

Class UnsynchronizedBuffer

java.lang.Object

org.apache.accumulo.core.util.UnsynchronizedBuffer

public class UnsynchronizedBuffer
extends Object

A utility class for reading and writing bytes to byte buffers without synchronization.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	UnsynchronizedBuffer.Reader	A byte buffer reader.
static class	UnsynchronizedBuffer.Writer	A byte buffer writer.

Constructor Summary

Constructors

Constructor	Description
UnsynchronizedBuffer()

Method Summary

Modifier and Type	Method	Description
static int	nextArraySize(int i)	Determines what next array size should be by rounding up to next power of two.
static int	writeVInt(byte[] dest, int offset, int i)	Writes a variable int directly to a byte array.
static void	writeVInt(DataOutput out, byte[] workBuffer, int i)	Use the provided byte[] to buffer only the bytes used to write out the integer i to the DataOutput out.
static int	writeVLong(byte[] dest, int offset, long value)	Writes a variable long directly to a byte array.
static void	writeVLong(DataOutput out, byte[] workBuffer, long i)	Use the provided byte[] to buffer only the bytes used to write out the long i to the DataOutput out.

Methods inherited from class java.lang.Object

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

Constructor Detail

UnsynchronizedBuffer

public UnsynchronizedBuffer()

Method Detail

nextArraySize

public static int nextArraySize(int i)

Determines what next array size should be by rounding up to next power of two.

Parameters:

i - current array size

Returns:

next array size

Throws:

IllegalArgumentException - if i is negative

writeVInt

public static void writeVInt(DataOutput out,
                             byte[] workBuffer,
                             int i)
                      throws IOException

Use the provided byte[] to buffer only the bytes used to write out the integer i to the DataOutput out. This will only ever make one write call to the DataOutput. Use this instead of WritableUtils.writeVInt(DataOutput, int) which could make up to 4 separate writes to the underlying OutputStream. Is compatible with WritableUtils as it will write the same data.

Throws:

IOException

writeVLong

public static void writeVLong(DataOutput out,
                              byte[] workBuffer,
                              long i)
                       throws IOException

Use the provided byte[] to buffer only the bytes used to write out the long i to the DataOutput out. This will only ever make one write call to the DataOutput. Use this instead of WritableUtils.writeVLong(DataOutput, long) which could make up to 8 separate writes to the underlying OutputStream. Is compatible with WritableUtils as it will write the same data.

Throws:

IOException

writeVInt

public static int writeVInt(byte[] dest,
                            int offset,
                            int i)

Writes a variable int directly to a byte array. Is compatible with WritableUtils as it will write the same data.

writeVLong

public static int writeVLong(byte[] dest,
                             int offset,
                             long value)

Writes a variable long directly to a byte array. Is compatible with WritableUtils as it will write the same data.

Parameters:

dest - The destination array for the long to be written to

offset - The location where to write the long to

value - The long value being written into byte array

Returns:

Returns the new offset location