org.fjank.jcache.persistence
Class CacheFileAdapter

java.lang.Object
  org.fjank.jcache.persistence.CacheFileAdapter

public class CacheFileAdapter
extends Object

Provides thread safe access to the underlying random access file.

Constructor Summary

CacheFileAdapter(File file)
Creates a new CacheFileAdapter object.

Method Summary

void	append(byte[] data)
org.fjank.jcache.persistence.DiskElementDescriptor	appendObject(CacheObject obj) adds an object to the diskcache.
void	close()
static DiskCacheObject	deSerialize(byte[] data)
long	length()
byte[]	read(long pos) reads from the diskfile, and return the raw bytes contained at that pos.
Serializable	readObject(long pos) reads an object starting at the position,.
void	reset()
static byte[]	serialize(Serializable obj)
String	toString() returns a String representation of this object.
void	write(byte[] data, long pos)
void	writeObject(Serializable obj, long pos) writes an object down to the cachefile

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheFileAdapter

public CacheFileAdapter(File file)

Creates a new CacheFileAdapter object.

Parameters:

file - the file to adapt to

Throws:

DiskCacheException - if any exceptioins occur.

Method Detail

toString

public String toString()

returns a String representation of this object.

Overrides:

toString in class Object

Returns:

a String representation of this object.

read

public byte[] read(long pos)

reads from the diskfile, and return the raw bytes contained at that pos. Its up to the client to deSerialize.

Parameters:

pos - the position to start at.

Returns:

a byte[] containing the raw bytes for the object.

readObject

public Serializable readObject(long pos)
                        throws DiskCacheException

reads an object starting at the position,.

Parameters:

pos - the position to start at

Returns:

a Serializable object read from the diskcache.

Throws:

DiskCacheException

DiskCacheException - if any exceptions occur.

append

public void append(byte[] data)
            throws DiskCacheException

Throws:

DiskCacheException

write

public void write(byte[] data,
                  long pos)

writeObject

public void writeObject(Serializable obj,
                        long pos)

writes an object down to the cachefile

Parameters:

obj - the object to write

pos - the position to start at.

Throws:

DiskCacheException - if any exception occur.

appendObject

public org.fjank.jcache.persistence.DiskElementDescriptor appendObject(CacheObject obj)

adds an object to the diskcache.

Parameters:

obj - the object to add.

Returns:

a disk element descriptor used to locate the object

Throws:

DiskCacheException - if any exceptions occur.

length

public long length()

close

public void close()

reset

public void reset()

serialize

public static byte[] serialize(Serializable obj)

deSerialize

public static DiskCacheObject deSerialize(byte[] data)
                                   throws DiskCacheException

Throws:

DiskCacheException