com.caucho.vfs

Class JniMemoryMappedFile

java.lang.Object

com.caucho.vfs.RandomAccessStream

com.caucho.vfs.JniMemoryMappedFile

All Implemented Interfaces:

LockableStream

public class JniMemoryMappedFile
extends RandomAccessStream

Stream using with JNI.

Method Summary

Modifier and Type	Method and Description
protected void	closeImpl() Closes the stream.
protected void	finalize()
void	flushToDisk()
void	fsync()
long	getFilePointer() Returns the current position of the file pointer.
java.io.InputStream	getInputStream() Returns an InputStream for this stream.
long	getLength() Returns the length.
long	getMmapAddress()
java.io.OutputStream	getOutputStream() Returns an OutputStream for this stream.
static boolean	isEnabled()
boolean	isMmap() Returns true for mmap
static JniMemoryMappedFile	open(Path path, byte[] name, int length, long fileLength)
int	read() Read a byte from the file, advancing the pointer.
int	read(byte[] buf, int offset, int length) Reads data from the file.
int	read(char[] buf, int offset, int length) Reads data from the file.
int	read(long pos, byte[] buf, int offset, int length) Reads data from the file.
boolean	seek(long position) Seeks to the given position in the file.
java.lang.String	toString() Returns the debug name for the stream.
void	write(byte[] buf, int offset, int length) Writes data to the file.
void	write(int b) Write a byte to the file, advancing the pointer.
void	write(long pos, byte[] buf, int offset, int length) Writes data to the file.
boolean	writeToStream(SendfileOutputStream os, long offset, long length, long[] blockAddresses, long blockLength) Writes data to the file.

Methods inherited from class com.caucho.vfs.RandomAccessStream

allocate, close, free, getUseCount, isOpen, lock, unlock

Methods inherited from class java.lang.Object

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

Method Detail

isEnabled

public static boolean isEnabled()

open

public static JniMemoryMappedFile open(Path path,
                                       byte[] name,
                                       int length,
                                       long fileLength)

isMmap

public boolean isMmap()

Returns true for mmap

Overrides:

isMmap in class RandomAccessStream

getLength

public long getLength()
               throws java.io.IOException

Returns the length.

Specified by:

getLength in class RandomAccessStream

Throws:

java.io.IOException

read

public int read(long pos,
                byte[] buf,
                int offset,
                int length)
         throws java.io.IOException

Reads data from the file.

Specified by:

read in class RandomAccessStream

Throws:

java.io.IOException

getMmapAddress

public long getMmapAddress()

Overrides:

getMmapAddress in class RandomAccessStream

write

public void write(long pos,
                  byte[] buf,
                  int offset,
                  int length)
           throws java.io.IOException

Writes data to the file.

Specified by:

write in class RandomAccessStream

Throws:

java.io.IOException

writeToStream

public boolean writeToStream(SendfileOutputStream os,
                             long offset,
                             long length,
                             long[] blockAddresses,
                             long blockLength)
                      throws java.io.IOException

Writes data to the file.

Overrides:

writeToStream in class RandomAccessStream

Throws:

java.io.IOException

fsync

public void fsync()
           throws java.io.IOException

Overrides:

fsync in class RandomAccessStream

Throws:

java.io.IOException

flushToDisk

public void flushToDisk()
                 throws java.io.IOException

Throws:

java.io.IOException

read

public int read(byte[] buf,
                int offset,
                int length)
         throws java.io.IOException

Reads data from the file.

Specified by:

read in class RandomAccessStream

Throws:

java.io.IOException

read

public int read(char[] buf,
                int offset,
                int length)
         throws java.io.IOException

Reads data from the file.

Specified by:

read in class RandomAccessStream

Throws:

java.io.IOException

write

public void write(byte[] buf,
                  int offset,
                  int length)
           throws java.io.IOException

Writes data to the file.

Specified by:

write in class RandomAccessStream

Throws:

java.io.IOException

seek

public boolean seek(long position)

Seeks to the given position in the file.

Specified by:

seek in class RandomAccessStream

getOutputStream

public java.io.OutputStream getOutputStream()
                                     throws java.io.IOException

Returns an OutputStream for this stream.

Specified by:

getOutputStream in class RandomAccessStream

Throws:

java.io.IOException

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException

Returns an InputStream for this stream.

Specified by:

getInputStream in class RandomAccessStream

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Read a byte from the file, advancing the pointer.

Specified by:

read in class RandomAccessStream

Throws:

java.io.IOException

write

public void write(int b)
           throws java.io.IOException

Write a byte to the file, advancing the pointer.

Specified by:

write in class RandomAccessStream

Throws:

java.io.IOException

getFilePointer

public long getFilePointer()
                    throws java.io.IOException

Returns the current position of the file pointer.

Specified by:

getFilePointer in class RandomAccessStream

Throws:

java.io.IOException

closeImpl

protected void closeImpl()
                  throws java.io.IOException

Description copied from class: RandomAccessStream

Closes the stream.

Overrides:

closeImpl in class RandomAccessStream

Throws:

java.io.IOException

finalize

protected void finalize()
                 throws java.io.IOException

Overrides:

finalize in class java.lang.Object

Throws:

java.io.IOException

toString

public java.lang.String toString()

Returns the debug name for the stream.

Overrides:

toString in class java.lang.Object