net.dontdrinkandroot.cache.impl.disk.indexed.storage

Class DataFile

java.lang.Object

net.dontdrinkandroot.cache.impl.disk.indexed.storage.DataFile

public class DataFile
extends Object

Author:

Philip W. Sorst

Field Summary

Fields

Modifier and Type	Field and Description
protected File	file
protected DataBlock	lastBlock Pointer to the last used block.
protected org.slf4j.Logger	logger
protected RandomAccessFile	randomAccessFile
protected TreeSet<DataBlock>	usedBlocks Ordered set of used blocks

Constructor Summary

Constructors

Constructor and Description
DataFile(File file)

Method Summary

Methods

Modifier and Type	Method and Description
void	allocateSpace(DataBlock dataBlock)
boolean	checkConsistency()
void	close() Closes the underlying random access file.
void	delete(DataBlock dataBlock, boolean truncate)
String	getFileName()
int	getNumAllocated()
long	length() Returns the length of the underlying random access file.
byte[]	read(DataBlock dataBlock)
DataBlock	write(byte[] data)

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final org.slf4j.Logger logger

randomAccessFile

protected final RandomAccessFile randomAccessFile

usedBlocks

protected final TreeSet<DataBlock> usedBlocks

Ordered set of used blocks

lastBlock

protected DataBlock lastBlock

Pointer to the last used block.

file

protected File file

Constructor Detail

DataFile

public DataFile(File file)
         throws FileNotFoundException

Throws:

FileNotFoundException

Method Detail

allocateSpace

public void allocateSpace(DataBlock dataBlock)
                   throws AllocationException

Throws:

AllocationException

checkConsistency

public boolean checkConsistency()

close

public void close()
           throws IOException

Closes the underlying random access file.

Throws:

IOException

delete

public void delete(DataBlock dataBlock,
          boolean truncate)

getNumAllocated

public int getNumAllocated()

getFileName

public String getFileName()

length

public long length()
            throws IOException

Returns the length of the underlying random access file.

Throws:

IOException

read

public byte[] read(DataBlock dataBlock)
            throws IOException

Throws:

IOException

write

public DataBlock write(byte[] data)
                throws IOException

Throws:

IOException