water.persist
Class PersistFS

java.lang.Object
  water.persist.Persist
      water.persist.PersistFS

public final class PersistFS
extends Persist

Persistence backend using local file system.

Field Summary

java.io.File

_dir

Fields inherited from class water.persist.Persist

I, UNKNOWN

Method Summary

void	clear()
void	delete(Value v)
java.lang.String	getPath()
long	getTotalSpace()
long	getUsableSpace()
Value	lazyArrayChunk(Key key) Lazily manifest data chunks on demand.
byte[]	load(Value v) Value should already be persisted to disk.
void	loadExisting() Load all Key/Value pairs that can be found on the backend.
void	store(Value v)

Methods inherited from class water.persist.Persist

getIce, initialize

Methods inherited from class java.lang.Object

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

Field Detail

_dir

public final java.io.File _dir

Method Detail

getPath

public java.lang.String getPath()

Specified by:

getPath in class Persist

clear

public void clear()

Specified by:

clear in class Persist

loadExisting

public void loadExisting()

Description copied from class: Persist

Load all Key/Value pairs that can be found on the backend.

Specified by:

loadExisting in class Persist

load

public byte[] load(Value v)

Description copied from class: Persist

Value should already be persisted to disk. A racing delete can trigger a failure where we get a null return, but no crash (although one could argue that a racing load&delete is a bug no matter what).

Specified by:

load in class Persist

store

public void store(Value v)

Specified by:

store in class Persist

delete

public void delete(Value v)

Specified by:

delete in class Persist

lazyArrayChunk

public Value lazyArrayChunk(Key key)

Description copied from class: Persist

Lazily manifest data chunks on demand.

Specified by:

lazyArrayChunk in class Persist

getUsableSpace

public long getUsableSpace()

Overrides:

getUsableSpace in class Persist

getTotalSpace

public long getTotalSpace()

Overrides:

getTotalSpace in class Persist