Package org.apache.cassandra.io.util

Class EmptyRebufferer

java.lang.Object

org.apache.cassandra.io.util.EmptyRebufferer

All Implemented Interfaces:

java.lang.AutoCloseable, ReaderFileProxy, Rebufferer, RebuffererFactory

public class EmptyRebufferer
extends java.lang.Object
implements Rebufferer, RebuffererFactory

Nested Class Summary

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

Rebufferer.BufferHolder

Field Summary

Fields inherited from interface org.apache.cassandra.io.util.Rebufferer

EMPTY

Constructor Summary

Constructors

Constructor	Description
EmptyRebufferer(ChannelProxy channel)

Method Summary

Modifier and Type	Method	Description
ChannelProxy	channel()
void	close()
void	closeReader()	Called when a reader is closed.
long	fileLength()
double	getCrcCheckChance()	Needed for tests.
Rebufferer	instantiateRebufferer()
Rebufferer.BufferHolder	rebuffer(long position)	Rebuffer (move on or seek to) a given position, and return a buffer that can be used there.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyRebufferer

public EmptyRebufferer(ChannelProxy channel)

Method Detail

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface ReaderFileProxy

channel

public ChannelProxy channel()

Specified by:

channel in interface ReaderFileProxy

fileLength

public long fileLength()

Specified by:

fileLength in interface ReaderFileProxy

getCrcCheckChance

public double getCrcCheckChance()

Description copied from interface: ReaderFileProxy

Needed for tests. Returns the table's CRC check chance, which is only set for compressed tables.

Specified by:

getCrcCheckChance in interface ReaderFileProxy

rebuffer

public Rebufferer.BufferHolder rebuffer(long position)

Description copied from interface: Rebufferer

Rebuffer (move on or seek to) a given position, and return a buffer that can be used there. The only guarantee about the size of the returned data is that unless rebuffering at the end of the file, the buffer will not be empty and will contain the requested position, i.e. offset <= position < offset + bh.buffer().limit(), but the buffer will not be positioned there.

Specified by:

rebuffer in interface Rebufferer

closeReader

public void closeReader()

Description copied from interface: Rebufferer

Called when a reader is closed. Should clean up reader-specific data.

Specified by:

closeReader in interface Rebufferer

instantiateRebufferer

public Rebufferer instantiateRebufferer()

Specified by:

instantiateRebufferer in interface RebuffererFactory