Package org.apache.hadoop.hdfs.util

Class ByteArrayManager

java.lang.Object

org.apache.hadoop.hdfs.util.ByteArrayManager

@Private
public abstract class ByteArrayManager
extends java.lang.Object

Manage byte array creation and release.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ByteArrayManager.Conf	Configuration for ByteArrayManager.

Constructor Summary

Constructors

Constructor	Description
ByteArrayManager()

Method Summary

Modifier and Type	Method	Description
static int	leastPowerOfTwo(int n)
abstract byte[]	newByteArray(int size)	Create a byte array for the given length, where the length of the returned array is larger than or equal to the given length.
static ByteArrayManager	newInstance(ByteArrayManager.Conf conf)
abstract int	release(byte[] array)	Release the given byte array.

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteArrayManager

public ByteArrayManager()

Method Detail

leastPowerOfTwo

public static int leastPowerOfTwo(int n)

Returns:

the least power of two greater than or equal to n, i.e. return the least integer x with x >= n and x a power of two.

Throws:

org.apache.hadoop.HadoopIllegalArgumentException - if n <= 0.

newByteArray

public abstract byte[] newByteArray(int size)
                             throws java.lang.InterruptedException

Create a byte array for the given length, where the length of the returned array is larger than or equal to the given length. The current thread may be blocked if some resource is unavailable. The byte array created by this method must be released via the release(byte[]) method.

Returns:

a byte array with length larger than or equal to the given length.

Throws:

java.lang.InterruptedException

release

public abstract int release(byte[] array)

Release the given byte array. The byte array may or may not be created by the newByteArray(int) method.

Returns:

the number of free array.

newInstance

public static ByteArrayManager newInstance(ByteArrayManager.Conf conf)