de.cismet.tools

Class CalculationCache<KEY,VALUE>

java.lang.Object

de.cismet.tools.CalculationCache<KEY,VALUE>

Direct Known Subclasses:

SimpleCapabilitiesCache

public class CalculationCache<KEY,VALUE>
extends Object

Calculates values and cached it for a given time period.

Version:

$Revision$, $Date$

Author:

therter

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<KEY,VALUE>	cache
protected Calculator<KEY,VALUE>	calc
protected Map<KEY,Exception>	exceptionCache
protected static org.apache.log4j.Logger	LOG
protected List<KEY>	processingQueries
protected Timer	t
protected long	timeToCacheExceptions
protected long	timeToCacheResults

Constructor Summary

Constructors

Constructor and Description
CalculationCache(Calculator<KEY,VALUE> calc) Creates a new CalculationCache object.

Method Summary

Modifier and Type	Method and Description
VALUE	calcValue(KEY key) Calculates the value for the given key, if required and caches it.
long	getTimeToCacheExceptions() Gets the time in milliseconds, exceptions, which were thrown during the calculation of a value, should be cached.
long	getTimeToCacheResults() Gets the time in milliseconds, the result should be cached.
void	setTimeToCacheExceptions(long timeToCacheExceptions) Sets the time in milliseconds, exceptions, which were thrown during the calculation of a value, should be cached.
void	setTimeToCacheResults(long timeToCacheResults) Sets the time in milliseconds, the result should be cached.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected static final org.apache.log4j.Logger LOG

t

protected final Timer t

processingQueries

protected final List<KEY> processingQueries

cache

protected final Map<KEY,VALUE> cache

exceptionCache

protected final Map<KEY,Exception> exceptionCache

calc

protected Calculator<KEY,VALUE> calc

timeToCacheResults

protected long timeToCacheResults

timeToCacheExceptions

protected long timeToCacheExceptions

Constructor Detail

CalculationCache

public CalculationCache(Calculator<KEY,VALUE> calc)

Creates a new CalculationCache object.

Parameters:

calc - the calculator that should be used to calculate values of unknown keys

Method Detail

calcValue

public VALUE calcValue(KEY key)
                throws Exception

Calculates the value for the given key, if required and caches it.

Parameters:

key - link query

Returns:

value

Throws:

Exception - if any Exception is in exceptionCache

getTimeToCacheResults

public long getTimeToCacheResults()

Gets the time in milliseconds, the result should be cached.

Returns:

the time in milliseconds

setTimeToCacheResults

public void setTimeToCacheResults(long timeToCacheResults)

Sets the time in milliseconds, the result should be cached.

Parameters:

timeToCacheResults - the timeToCacheResults to set

getTimeToCacheExceptions

public long getTimeToCacheExceptions()

Gets the time in milliseconds, exceptions, which were thrown during the calculation of a value, should be cached.

Returns:

the time in milliseconds

setTimeToCacheExceptions

public void setTimeToCacheExceptions(long timeToCacheExceptions)

Sets the time in milliseconds, exceptions, which were thrown during the calculation of a value, should be cached.

Parameters:

timeToCacheExceptions - the timeToCacheException to set