Package org.h2.store.fs.niomapped

Class FileNioMapped

java.lang.Object

java.nio.channels.spi.AbstractInterruptibleChannel

java.nio.channels.FileChannel

org.h2.store.fs.FileBase

org.h2.store.fs.FileBaseDefault

org.h2.store.fs.niomapped.FileNioMapped

All Implemented Interfaces:

Closeable, AutoCloseable, ByteChannel, Channel, GatheringByteChannel, InterruptibleChannel, ReadableByteChannel, ScatteringByteChannel, SeekableByteChannel, WritableByteChannel

class FileNioMapped
extends FileBaseDefault

Uses memory mapped files. The file size is limited to 2 GB.

Nested Class Summary

Nested classes/interfaces inherited from class java.nio.channels.FileChannel

FileChannel.MapMode

Field Summary

Fields

Modifier and Type	Field	Description
private FileChannel	channel
private long	fileLength
private static final int	GC_TIMEOUT_MS
private MappedByteBuffer	mapped
private final FileChannel.MapMode	mode
private final String	name

Constructor Summary

Constructors

Constructor	Description
FileNioMapped(String fileName, String mode)

Method Summary

Modifier and Type	Method	Description
private static void	checkFileSizeLimit(long length)
void	force(boolean metaData)
void	implCloseChannel()
protected void	implTruncate(long newLength)	The truncate implementation.
int	read(ByteBuffer dst, long pos)
private void	reMap()	Re-map byte buffer into memory, called when file size has changed or file was created.
void	setFileLength(long newLength)
long	size()
String	toString()
FileLock	tryLock(long position, long size, boolean shared)
private void	unMap()
int	write(ByteBuffer src, long position)

Methods inherited from class org.h2.store.fs.FileBaseDefault

position, position, read, truncate, write

Methods inherited from class org.h2.store.fs.FileBase

lock, map, read, transferFrom, transferTo, write

Methods inherited from class java.nio.channels.FileChannel

lock, map, open, open, read, tryLock, write

Methods inherited from class java.nio.channels.spi.AbstractInterruptibleChannel

begin, close, end, isOpen

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.Channel

isOpen

Field Details

GC_TIMEOUT_MS

private static final int GC_TIMEOUT_MS

See Also:

• Constant Field Values

name

private final String name

mode

private final FileChannel.MapMode mode

channel

private FileChannel channel

mapped

private MappedByteBuffer mapped

fileLength

private long fileLength

Constructor Details

FileNioMapped

FileNioMapped(String fileName,
 String mode)
       throws IOException

Throws:

IOException

Method Details

unMap

private void unMap()
            throws IOException

Throws:

IOException

reMap

private void reMap()
            throws IOException

Re-map byte buffer into memory, called when file size has changed or file was created.

Throws:

IOException

checkFileSizeLimit

private static void checkFileSizeLimit(long length)
                                throws IOException

Throws:

IOException

implCloseChannel

public void implCloseChannel()
                      throws IOException

Overrides:

implCloseChannel in class FileBase

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

size

public long size()
          throws IOException

Specified by:

size in interface SeekableByteChannel

Specified by:

size in class FileChannel

Throws:

IOException

read

public int read(ByteBuffer dst,
 long pos)
         throws IOException

Overrides:

read in class FileBase

Throws:

IOException

implTruncate

protected void implTruncate(long newLength)
                     throws IOException

Description copied from class: FileBaseDefault

The truncate implementation.

Specified by:

implTruncate in class FileBaseDefault

Parameters:

newLength - the new size

Throws:

IOException - on failure

setFileLength

public void setFileLength(long newLength)
                   throws IOException

Throws:

IOException

force

public void force(boolean metaData)
           throws IOException

Overrides:

force in class FileBase

Throws:

IOException

write

public int write(ByteBuffer src,
 long position)
          throws IOException

Overrides:

write in class FileBase

Throws:

IOException

tryLock

public FileLock tryLock(long position,
 long size,
 boolean shared)
                 throws IOException

Overrides:

tryLock in class FileBase

Throws:

IOException