org.apache.hadoop.hdfs

Class DFSInputStream.ByteBufferStrategy

java.lang.Object

org.apache.hadoop.hdfs.DFSInputStream.ByteBufferStrategy

Enclosing class:

org.apache.hadoop.hdfs.DFSInputStream

protected class DFSInputStream.ByteBufferStrategy
extends Object

Used to read bytes into a user-supplied ByteBuffer

Method Summary

Methods

Modifier and Type	Method and Description
int	copyFrom(ByteBuffer src, int offset, int length) Copy data from the src ByteBuffer into the read buffer.
int	doRead(org.apache.hadoop.hdfs.BlockReader blockReader, int off, int len)

Methods inherited from class java.lang.Object

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

Method Detail

doRead

public int doRead(org.apache.hadoop.hdfs.BlockReader blockReader,
         int off,
         int len)
           throws IOException

Throws:

IOException

copyFrom

public int copyFrom(ByteBuffer src,
           int offset,
           int length)

Copy data from the src ByteBuffer into the read buffer.

Parameters:

src - The src buffer where the data is copied from

offset - Useful only when the ReadStrategy is based on a byte array. Indicate the offset of the byte array for copy.

length - Useful only when the ReadStrategy is based on a byte array. Indicate the length of the data to copy.