org.apache.cassandra.io.util
Class SequentialWriter

java.lang.Object
  java.io.OutputStream
      org.apache.cassandra.io.util.SequentialWriter

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

Direct Known Subclasses:

CompressedSequentialWriter

public class SequentialWriter
extends java.io.OutputStream

Nested Class Summary

protected static class

SequentialWriter.BufferedFileWriterMark Class to hold a mark to the position of the file

Field Summary

protected byte[]	buffer
protected long	bufferOffset
protected long	current
protected boolean	isDirty
protected java.io.RandomAccessFile	out
java.io.DataOutputStream	stream
protected boolean	syncNeeded
protected int	validBufferBytes

Constructor Summary

SequentialWriter(java.io.File file, int bufferSize, boolean skipIOCache)

Method Summary

void	close()
byte[]	digest() Return the digest associated to this file or null if no digest was created.
void	flush() If buffer is dirty, flush it's contents to the operating system.
protected void	flushData() Override this method instead of overriding flush()
protected void	flushInternal()
long	getFilePointer()
long	getOnDiskFilePointer() Return the current file pointer of the underlying on-disk file.
java.lang.String	getPath()
long	length()
FileMark	mark()
static SequentialWriter	open(java.io.File file)
static SequentialWriter	open(java.io.File file, boolean skipIOCache)
static SequentialWriter	open(java.io.File file, int bufferSize, boolean skipIOCache)
protected void	reBuffer()
void	resetAndTruncate(FileMark mark)
protected void	resetBuffer()
void	setComputeDigest() Turn on digest computation on this writer.
void	sync() Synchronize file contents with disk.
protected void	syncDataOnlyInternal()
protected void	syncInternal()
void	truncate(long toSize)
void	write(byte[] buffer)
void	write(byte[] data, int offset, int length)
void	write(int value)

Methods inherited from class java.lang.Object

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

Field Detail

isDirty

protected boolean isDirty

syncNeeded

protected boolean syncNeeded

buffer

protected byte[] buffer

current

protected long current

bufferOffset

protected long bufferOffset

validBufferBytes

protected int validBufferBytes

out

protected final java.io.RandomAccessFile out

stream

public final java.io.DataOutputStream stream

Constructor Detail

SequentialWriter

public SequentialWriter(java.io.File file,
                        int bufferSize,
                        boolean skipIOCache)

Method Detail

open

public static SequentialWriter open(java.io.File file)

open

public static SequentialWriter open(java.io.File file,
                                    boolean skipIOCache)

open

public static SequentialWriter open(java.io.File file,
                                    int bufferSize,
                                    boolean skipIOCache)

write

public void write(int value)
           throws java.nio.channels.ClosedChannelException

Specified by:

write in class java.io.OutputStream

Throws:

java.nio.channels.ClosedChannelException

write

public void write(byte[] buffer)
           throws java.nio.channels.ClosedChannelException

Overrides:

write in class java.io.OutputStream

Throws:

java.nio.channels.ClosedChannelException

write

public void write(byte[] data,
                  int offset,
                  int length)
           throws java.nio.channels.ClosedChannelException

Overrides:

write in class java.io.OutputStream

Throws:

java.nio.channels.ClosedChannelException

sync

public void sync()

Synchronize file contents with disk.

syncDataOnlyInternal

protected void syncDataOnlyInternal()

syncInternal

protected void syncInternal()

flush

public void flush()

If buffer is dirty, flush it's contents to the operating system. Does not imply fsync(). Currently, for implementation reasons, this also invalidates the buffer.

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

flushInternal

protected void flushInternal()

flushData

protected void flushData()

Override this method instead of overriding flush()

Throws:

FSWriteError - on any I/O error.

getFilePointer

public long getFilePointer()

getOnDiskFilePointer

public long getOnDiskFilePointer()

Return the current file pointer of the underlying on-disk file. Note that since write works by buffering data, the value of this will increase by buffer size and not every write to the writer will modify this value. Furthermore, for compressed files, this value refers to compressed data, while the writer getFilePointer() refers to uncompressedFile

length

public long length()

getPath

public java.lang.String getPath()

reBuffer

protected void reBuffer()

resetBuffer

protected void resetBuffer()

mark

public FileMark mark()

resetAndTruncate

public void resetAndTruncate(FileMark mark)

truncate

public void truncate(long toSize)

close

public void close()

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

setComputeDigest

public void setComputeDigest()

Turn on digest computation on this writer. This can only be called before any data is written to this write, otherwise an IllegalStateException is thrown.

digest

public byte[] digest()

Return the digest associated to this file or null if no digest was created. This can only be called once the file is fully created, i.e. after close() has been called. Otherwise an IllegalStateException is thrown.