org.apache.cassandra.streaming

Class StreamWriter

java.lang.Object

org.apache.cassandra.streaming.StreamWriter

Direct Known Subclasses:

CompressedStreamWriter

public class StreamWriter
extends java.lang.Object

StreamWriter writes given section of the SSTable to given channel.

Field Summary

Fields

Modifier and Type	Field and Description
protected StreamManager.StreamRateLimiter	limiter
protected java.util.Collection<Pair<java.lang.Long,java.lang.Long>>	sections
protected StreamSession	session
protected SSTableReader	sstable

Constructor Summary

Constructors

Constructor and Description
StreamWriter(SSTableReader sstable, java.util.Collection<Pair<java.lang.Long,java.lang.Long>> sections, StreamSession session)

Method Summary

Methods

Modifier and Type	Method and Description
protected long	totalSize()
protected long	write(RandomAccessReader reader, DataIntegrityMetadata.ChecksumValidator validator, int start, long length, long bytesTransferred) Sequentially read bytes from the file and write them to the output stream
void	write(java.nio.channels.WritableByteChannel channel) Stream file of specified sections to given channel.

Methods inherited from class java.lang.Object

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

Field Detail

sstable

protected final SSTableReader sstable

sections

protected final java.util.Collection<Pair<java.lang.Long,java.lang.Long>> sections

limiter

protected final StreamManager.StreamRateLimiter limiter

session

protected final StreamSession session

Constructor Detail

StreamWriter

public StreamWriter(SSTableReader sstable,
            java.util.Collection<Pair<java.lang.Long,java.lang.Long>> sections,
            StreamSession session)

Method Detail

write

public void write(java.nio.channels.WritableByteChannel channel)
           throws java.io.IOException

Stream file of specified sections to given channel. StreamWriter uses LZF compression on wire to decrease size to transfer.

Parameters:

channel - where this writes data to

Throws:

java.io.IOException - on any I/O error

totalSize

protected long totalSize()

write

protected long write(RandomAccessReader reader,
         DataIntegrityMetadata.ChecksumValidator validator,
         int start,
         long length,
         long bytesTransferred)
              throws java.io.IOException

Sequentially read bytes from the file and write them to the output stream

Parameters:

reader - The file reader to read from

validator - validator to verify data integrity

start - number of bytes to skip transfer, but include for validation.

length - The full length that should be read from reader

bytesTransferred - Number of bytes already read out of length

Returns:

Number of bytes read

Throws:

java.io.IOException - on any I/O error