org.apache.cassandra.io.util

Class RandomAccessReader

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.RebufferingInputStream

org.apache.cassandra.io.util.RandomAccessReader

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable, DataInputPlus, FileDataInput, RewindableDataInput

Direct Known Subclasses:

ChecksummedRandomAccessReader, CompressedRandomAccessReader, RandomAccessReader.RandomAccessReaderWithOwnChannel

public class RandomAccessReader
extends RebufferingInputStream
implements FileDataInput

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	RandomAccessReader.BufferedRandomAccessFileMark Class to hold a mark to the position of the file
static class	RandomAccessReader.Builder
static class	RandomAccessReader.RandomAccessReaderWithOwnChannel

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.DataInputPlus

DataInputPlus.DataInputStreamPlus

Field Summary

Fields

Modifier and Type	Field and Description
protected long	bufferOffset
protected int	bufferSize
protected BufferType	bufferType
protected ChannelProxy	channel
static int	DEFAULT_BUFFER_SIZE
protected com.google.common.util.concurrent.RateLimiter	limiter
protected long	markedPointer
static int	MAX_BUFFER_SIZE
protected MmappedRegions	regions

Fields inherited from class org.apache.cassandra.io.util.RebufferingInputStream

buffer

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RandomAccessReader(RandomAccessReader.Builder builder)

Method Summary

Modifier and Type	Method and Description
protected static java.nio.ByteBuffer	allocateBuffer(int size, BufferType bufferType)
int	available()
long	bytesPastMark()
long	bytesPastMark(DataPosition mark)
long	bytesRemaining()
void	close()
protected long	current()
ChannelProxy	getChannel()
long	getFilePointer()
java.lang.String	getPath()
long	getPosition()
boolean	isEOF()
long	length()
DataPosition	mark()
boolean	markSupported()
static RandomAccessReader	open(ChannelProxy channel)
static RandomAccessReader	open(java.io.File file)
java.lang.String	readLine() Reads a line of text form the current position in this file.
void	reBuffer() Read data from file starting from current currentOffset to populate buffer.
protected void	reBufferMmap()
protected void	reBufferStandard()
protected void	releaseBuffer()
void	reset()
void	reset(DataPosition mark)
void	seek(long newPosition)
java.lang.String	toString()

Methods inherited from class org.apache.cassandra.io.util.RebufferingInputStream

read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLong, readPrimitiveSlowly, readShort, readUnsignedByte, readUnsignedShort, readUnsignedVInt, readUTF, readVInt, skipBytes

Methods inherited from class java.io.InputStream

mark, read, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.io.util.DataInputPlus

readUnsignedVInt, readVInt, skipBytes, skipBytesFully

Methods inherited from interface java.io.DataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF

Field Detail

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

MAX_BUFFER_SIZE

public static final int MAX_BUFFER_SIZE

See Also:

Constant Field Values

channel

protected final ChannelProxy channel

regions

protected final MmappedRegions regions

limiter

protected final com.google.common.util.concurrent.RateLimiter limiter

bufferSize

protected final int bufferSize

bufferType

protected final BufferType bufferType

bufferOffset

protected long bufferOffset

markedPointer

protected long markedPointer

Constructor Detail

RandomAccessReader

protected RandomAccessReader(RandomAccessReader.Builder builder)

Method Detail

allocateBuffer

protected static java.nio.ByteBuffer allocateBuffer(int size,
                                                    BufferType bufferType)

releaseBuffer

protected void releaseBuffer()

reBuffer

public void reBuffer()

Read data from file starting from current currentOffset to populate buffer.

Specified by:

reBuffer in class RebufferingInputStream

reBufferStandard

protected void reBufferStandard()

reBufferMmap

protected void reBufferMmap()

getFilePointer

public long getFilePointer()

Specified by:

getFilePointer in interface FileDataInput

current

protected long current()

getPath

public java.lang.String getPath()

Specified by:

getPath in interface FileDataInput

getChannel

public ChannelProxy getChannel()

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class RebufferingInputStream

Throws:

java.io.IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class RebufferingInputStream

bytesPastMark

public long bytesPastMark()

mark

public DataPosition mark()

Specified by:

mark in interface RewindableDataInput

reset

public void reset(DataPosition mark)

Specified by:

reset in interface RewindableDataInput

bytesPastMark

public long bytesPastMark(DataPosition mark)

Specified by:

bytesPastMark in interface RewindableDataInput

isEOF

public boolean isEOF()

Specified by:

isEOF in interface FileDataInput

Returns:

true if there is no more data to read

bytesRemaining

public long bytesRemaining()

Specified by:

bytesRemaining in interface FileDataInput

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

seek

public void seek(long newPosition)

Specified by:

seek in interface FileDataInput

readLine

public final java.lang.String readLine()
                                throws java.io.IOException

Reads a line of text form the current position in this file. A line is represented by zero or more characters followed by '\n', '\r', "\r\n" or the end of file marker. The string does not include the line terminating sequence.

Blocks until a line terminating sequence has been read, the end of the file is reached or an exception is thrown.

Specified by:

readLine in interface java.io.DataInput

Overrides:

readLine in class RebufferingInputStream

Returns:

the contents of the line or null if no characters have been read before the end of the file has been reached.

Throws:

java.io.IOException - if this file is closed or another I/O error occurs.

length

public long length()

getPosition

public long getPosition()

open

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

open

public static RandomAccessReader open(ChannelProxy channel)