org.treetank.io

Class LRULog

java.lang.Object

org.treetank.io.LRULog

All Implemented Interfaces:

ILog

public final class LRULog
extends Object
implements ILog

An LRU cache, based on LinkedHashMap. This cache can hold an possible second cache as a second layer for example for storing data in a persistent way.

Author:

Sebastian Graf, University of Konstanz

Constructor Summary

Constructors

Constructor and Description
LRULog(File pFile, IDataFactory pDataFac, IMetaEntryFactory pMetaFac) Creates a new LRU cache.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closing the log.
LogValue	get(LogKey pKey) Getting a LogValue for a given key
org.treetank.io.LRULog.LogIterator	getIterator() Returning all elements as Iterator.
boolean	isClosed() Check if log is closed or not.
void	put(LogKey pKey, LogValue pValue) Putting a new entry to the log, overriding already existing entries.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

LRULog

public LRULog(File pFile,
      IDataFactory pDataFac,
      IMetaEntryFactory pMetaFac)
       throws TTIOException

Creates a new LRU cache.

Parameters:

pFile - Location of the cache.

pDataFac - DataFactory for generating datas adhering to the used interface

pMetaFac - MetaFactory for generating meta-entries adhering to the used interface

Throws:

TTIOException

Method Detail

get

public LogValue get(LogKey pKey)
             throws TTIOException

Getting a LogValue for a given key

Specified by:

get in interface ILog

Parameters:

pKey - the key

Returns:

a suitable LogValue if present, false otherwise

Throws:

TTIOException

put

public void put(LogKey pKey,
       LogValue pValue)
         throws TTIOException

Putting a new entry to the log, overriding already existing entries.

Specified by:

put in interface ILog

Parameters:

pKey - to be set

pValue - to be set

Throws:

TTIOException

close

public void close()
           throws TTIOException

Closing the log.

Specified by:

close in interface ILog

Throws:

TTIOException

isClosed

public boolean isClosed()

Check if log is closed or not.

Specified by:

isClosed in interface ILog

Returns:

if log is closed.

toString

public String toString()

Overrides:

toString in class Object

getIterator

public org.treetank.io.LRULog.LogIterator getIterator()

Returning all elements as Iterator.

Returns:

new LogIterator-instance