org.apache.cassandra.db.streaming

Class CassandraStreamWriter

java.lang.Object

org.apache.cassandra.db.streaming.CassandraStreamWriter

Direct Known Subclasses:

CassandraCompressedStreamWriter

public class CassandraStreamWriter
extends java.lang.Object

CassandraStreamWriter 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<SSTableReader.PartitionPositionBounds>	sections
protected StreamSession	session
protected SSTableReader	sstable

Constructor Summary

Constructors

Constructor and Description
CassandraStreamWriter(SSTableReader sstable, CassandraStreamHeader header, StreamSession session)

Method Summary

Modifier and Type	Method and Description
protected long	totalSize()
protected long	write(ChannelProxy proxy, DataIntegrityMetadata.ChecksumValidator validator, StreamingDataOutputPlus output, long start, int transferOffset, int toTransfer, int bufferSize) Sequentially read bytes from the file and write them to the output stream
void	write(StreamingDataOutputPlus out) 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<SSTableReader.PartitionPositionBounds> sections

limiter

protected final StreamManager.StreamRateLimiter limiter

session

protected final StreamSession session

Constructor Detail

CassandraStreamWriter

public CassandraStreamWriter(SSTableReader sstable,
                             CassandraStreamHeader header,
                             StreamSession session)

Method Detail

write

public void write(StreamingDataOutputPlus out)
           throws java.io.IOException

Stream file of specified sections to given channel.

Parameters:

out - where this writes data to

Throws:

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

totalSize

protected long totalSize()

write

protected long write(ChannelProxy proxy,
                     DataIntegrityMetadata.ChecksumValidator validator,
                     StreamingDataOutputPlus output,
                     long start,
                     int transferOffset,
                     int toTransfer,
                     int bufferSize)
              throws java.io.IOException

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

Parameters:

proxy - The file reader to read from

validator - validator to verify data integrity

start - The readd offset from the beginning of the proxy file.

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

toTransfer - The number of bytes to be transferred.

Returns:

Number of bytes transferred.

Throws:

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