Package com.mckoi.store

Class ScatteringStoreDataAccessor

java.lang.Object

com.mckoi.store.ScatteringStoreDataAccessor

public class ScatteringStoreDataAccessor
extends java.lang.Object

An implementation of StoreDataAccessor that scatters the addressible data resource across multiple files in the file system. When one store data resource reaches a certain threshold size, the content 'flows' over to the next file.

Author:

Tobias Downer

Constructor Summary

Constructors

Constructor	Description
ScatteringStoreDataAccessor(java.io.File path, java.lang.String file_name, java.lang.String first_ext, long max_slice_size)	Constructs the store data accessor.

Method Summary

Modifier and Type	Method	Description
void	close()
void	convertToScatteringStore(java.io.File f)	Given a file, this will convert to a scattering file store with files no larger than the maximum slice size.
boolean	delete()
boolean	exists()
long	getSize()
void	open(boolean read_only)
void	read(long position, byte[] buf, int off, int len)
void	setSize(long length)
void	synch()
void	write(long position, byte[] buf, int off, int len)

Methods inherited from class java.lang.Object

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

Constructor Detail

ScatteringStoreDataAccessor

public ScatteringStoreDataAccessor(java.io.File path,
                                   java.lang.String file_name,
                                   java.lang.String first_ext,
                                   long max_slice_size)

Constructs the store data accessor.

Method Detail

convertToScatteringStore

public void convertToScatteringStore(java.io.File f)
                              throws java.io.IOException

Given a file, this will convert to a scattering file store with files no larger than the maximum slice size.

Throws:

java.io.IOException

open

public void open(boolean read_only)
          throws java.io.IOException

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Throws:

java.io.IOException

delete

public boolean delete()

exists

public boolean exists()

read

public void read(long position,
                 byte[] buf,
                 int off,
                 int len)
          throws java.io.IOException

Throws:

java.io.IOException

write

public void write(long position,
                  byte[] buf,
                  int off,
                  int len)
           throws java.io.IOException

Throws:

java.io.IOException

setSize

public void setSize(long length)
             throws java.io.IOException

Throws:

java.io.IOException

getSize

public long getSize()
             throws java.io.IOException

Throws:

java.io.IOException

synch

public void synch()
           throws java.io.IOException

Throws:

java.io.IOException