com.northconcepts.datapipeline.transform.lookup

Class CachedLookup

java.lang.Object

com.northconcepts.datapipeline.transform.lookup.Lookup

com.northconcepts.datapipeline.transform.lookup.ProxyLookup

com.northconcepts.datapipeline.transform.lookup.CachedLookup

public class CachedLookup
extends ProxyLookup

A Lookup that lazily caches the results of successful lookups performed by another instance.

Constructor Summary

Constructors

Constructor and Description
CachedLookup(Lookup nestedLookup) Creates a new CachedLookup that has no limit and never clears itself.
CachedLookup(Lookup nestedLookup, int maxEntries) Creates a new limited CachedLookup that never clears itself.
CachedLookup(Lookup nestedLookup, Integer maxEntries, Scheduler resetSchedule) Creates a new CachedLookup.

Method Summary

Modifier and Type	Method and Description
void	clear()
RecordList	get(Object... args)
int	getEntries() Returns the number of cached elements.
long	getHits() Returns the number of lookup requests where the results were already cached.
Integer	getMaxEntries()
long	getMisses() Returns the number of lookup requests where the results were not already cached and the underlying lookup was used.
long	getRequests() Returns the number of lookup requests made on this cache (sum of getHits() and getMisses()).
Scheduler	getResetSchedule()
String	toString()

Methods inherited from class com.northconcepts.datapipeline.transform.lookup.ProxyLookup

close, getNestedLookup, open, setNestedLookup

Methods inherited from class com.northconcepts.datapipeline.transform.lookup.Lookup

get

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedLookup

public CachedLookup(Lookup nestedLookup,
                    Integer maxEntries,
                    Scheduler resetSchedule)

Creates a new CachedLookup.

Parameters:

nestedLookup - the underlying lookup to use for cache misses.

maxEntries - the maximum number of results to cache or null if there should be no limit.

resetSchedule - the scheduler used to clear/remove all cached entries or null if the cache should never be cleared.

CachedLookup

public CachedLookup(Lookup nestedLookup,
                    int maxEntries)

Creates a new limited CachedLookup that never clears itself.

Parameters:

nestedLookup - the underlying lookup to use for cache misses.

maxEntries - the maximum number of results to cache or null if there should be no limit.

CachedLookup

public CachedLookup(Lookup nestedLookup)

Creates a new CachedLookup that has no limit and never clears itself.

Method Detail

getEntries

public int getEntries()

Returns the number of cached elements.

getMaxEntries

public Integer getMaxEntries()

getResetSchedule

public Scheduler getResetSchedule()

getHits

public long getHits()

Returns the number of lookup requests where the results were already cached.

getMisses

public long getMisses()

Returns the number of lookup requests where the results were not already cached and the underlying lookup was used.

getRequests

public long getRequests()

Returns the number of lookup requests made on this cache (sum of getHits() and getMisses()).

clear

public void clear()

get

public RecordList get(Object... args)

Overrides:

get in class ProxyLookup

toString

public String toString()

Overrides:

toString in class Object