org.apache.cassandra.io.util

Class MmappedRegions

java.lang.Object

org.apache.cassandra.utils.concurrent.SharedCloseableImpl

org.apache.cassandra.io.util.MmappedRegions

All Implemented Interfaces:

java.lang.AutoCloseable, SharedCloseable

public class MmappedRegions
extends SharedCloseableImpl

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MmappedRegions.Region
static class	MmappedRegions.Tidier

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_SEGMENT_SIZE In a perfect world, MAX_SEGMENT_SIZE would be final, but we need to test with a smaller size

Method Summary

Modifier and Type	Method and Description
static MmappedRegions	empty(ChannelProxy channel)
void	extend(long length)
MmappedRegions.Region	floor(long position)
boolean	isEmpty()
boolean	isValid(ChannelProxy channel)
static MmappedRegions	map(ChannelProxy channel, CompressionMetadata metadata)
static MmappedRegions	map(ChannelProxy channel, long length)
MmappedRegions	sharedCopy()

Methods inherited from class org.apache.cassandra.utils.concurrent.SharedCloseableImpl

addTo, close, close, isCleanedUp

Methods inherited from class java.lang.Object

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

Field Detail

MAX_SEGMENT_SIZE

public static int MAX_SEGMENT_SIZE

In a perfect world, MAX_SEGMENT_SIZE would be final, but we need to test with a smaller size

Method Detail

empty

public static MmappedRegions empty(ChannelProxy channel)

map

public static MmappedRegions map(ChannelProxy channel,
                                 CompressionMetadata metadata)

map

public static MmappedRegions map(ChannelProxy channel,
                                 long length)

sharedCopy

public MmappedRegions sharedCopy()

Returns:

a snapshot of the memory mapped regions. The snapshot can only use existing regions, it cannot create new ones.

extend

public void extend(long length)

isValid

public boolean isValid(ChannelProxy channel)

isEmpty

public boolean isEmpty()

floor

public MmappedRegions.Region floor(long position)