com.epimorphics.lda.cache

Class LimitedCacheBase

java.lang.Object

com.epimorphics.lda.cache.LimitedCacheBase

All Implemented Interfaces:

Cache

Direct Known Subclasses:

PermaCache

public abstract class LimitedCacheBase
extends Object
implements Cache

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LimitedCacheBase.TimedThing<T>

Nested classes/interfaces inherited from interface com.epimorphics.lda.cache.Cache

Cache.Clock, Cache.Controller, Cache.Registry

Field Summary

Fields

Modifier and Type	Field and Description
protected Cache.Clock	clock
protected int	identity
protected String	label

Constructor Summary

Constructors

Constructor and Description
LimitedCacheBase(Cache.Clock clock, String label)

Method Summary

Methods

Modifier and Type	Method and Description
void	cacheDescription(List<com.hp.hpl.jena.rdf.model.Resource> results, String view, APIResultSet rs, long expiresAt) Make an entry in the caches that associates the result set rs with the given list of resources and view.
void	cacheSelection(String select, List<com.hp.hpl.jena.rdf.model.Resource> results, long expiresAt) Make an entry in the cache that binds the given list of results to the given select query string.
void	clear() Clear this cache.
protected abstract boolean	exceedsCountLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<Integer>> cr)
protected abstract boolean	exceedsResponseLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<URI,LimitedCacheBase.TimedThing<ResponseResult>> cr)
protected abstract boolean	exceedsResultSetLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<APIResultSet>> m)
protected abstract boolean	exceedsSelectLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<List<com.hp.hpl.jena.rdf.model.Resource>>> m)
LimitedCacheBase.TimedThing<ResponseResult>	fetch(URI uri)
List<com.hp.hpl.jena.rdf.model.Resource>	getCachedResources(String select) Answer the list of resources associated with this select query if any is available (entered and not discarded).
LimitedCacheBase.TimedThing<APIResultSet>	getCachedResultSet(List<com.hp.hpl.jena.rdf.model.Resource> results, String view) Answer the API result set remembered for the given list of results and view, or null if there isn't one.
int	getCount(String countQueryString) Get the total number of items that this query will return, -1 for "not known".
int	numEntries() Answer how many entries are in this cache.
void	putCount(String countQueryString, int count, long expiresAt) Put the total number of items that this query returns.
void	resetCounts() Reset to suitable zeroes the counts of this cache.
void	show(StringBuilder sb) Append an HTML description of this cache to sb.
void	store(URI uri, ResponseResult toStore, long expiresAt)
String	summary() Answer a summary description of this cache.

Methods inherited from class java.lang.Object

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

Field Detail

label

protected final String label

identity

protected final int identity

clock

protected final Cache.Clock clock

Constructor Detail

LimitedCacheBase

public LimitedCacheBase(Cache.Clock clock,
                String label)

Method Detail

summary

public String summary()

Description copied from interface: Cache

Answer a summary description of this cache. In particular, include a unique ID.

Specified by:

summary in interface Cache

show

public void show(StringBuilder sb)

Description copied from interface: Cache

Append an HTML description of this cache to sb.

Specified by:

show in interface Cache

fetch

public LimitedCacheBase.TimedThing<ResponseResult> fetch(URI uri)

Specified by:

fetch in interface Cache

store

public void store(URI uri,
         ResponseResult toStore,
         long expiresAt)

Specified by:

store in interface Cache

exceedsResponseLimit

protected abstract boolean exceedsResponseLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<URI,LimitedCacheBase.TimedThing<ResponseResult>> cr)

exceedsCountLimit

protected abstract boolean exceedsCountLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<Integer>> cr)

exceedsSelectLimit

protected abstract boolean exceedsSelectLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<List<com.hp.hpl.jena.rdf.model.Resource>>> m)

exceedsResultSetLimit

protected abstract boolean exceedsResultSetLimit(com.epimorphics.lda.cache.LimitedCacheBase.Cachelet<String,LimitedCacheBase.TimedThing<APIResultSet>> m)

getCachedResultSet

public LimitedCacheBase.TimedThing<APIResultSet> getCachedResultSet(List<com.hp.hpl.jena.rdf.model.Resource> results,
                                                           String view)

Description copied from interface: Cache

Answer the API result set remembered for the given list of results and view, or null if there isn't one.

Specified by:

getCachedResultSet in interface Cache

getCachedResources

public List<com.hp.hpl.jena.rdf.model.Resource> getCachedResources(String select)

Description copied from interface: Cache

Answer the list of resources associated with this select query if any is available (entered and not discarded).

Specified by:

getCachedResources in interface Cache

cacheDescription

public void cacheDescription(List<com.hp.hpl.jena.rdf.model.Resource> results,
                    String view,
                    APIResultSet rs,
                    long expiresAt)

Description copied from interface: Cache

Make an entry in the caches that associates the result set rs with the given list of resources and view.

Specified by:

cacheDescription in interface Cache

cacheSelection

public void cacheSelection(String select,
                  List<com.hp.hpl.jena.rdf.model.Resource> results,
                  long expiresAt)

Description copied from interface: Cache

Make an entry in the cache that binds the given list of results to the given select query string.

Specified by:

cacheSelection in interface Cache

getCount

public int getCount(String countQueryString)

Get the total number of items that this query will return, -1 for "not known".

Specified by:

getCount in interface Cache

putCount

public void putCount(String countQueryString,
            int count,
            long expiresAt)

Put the total number of items that this query returns.

Specified by:

putCount in interface Cache

resetCounts

public void resetCounts()

Description copied from interface: Cache

Reset to suitable zeroes the counts of this cache.

Specified by:

resetCounts in interface Cache

clear

public void clear()

Description copied from interface: Cache

Clear this cache.

Specified by:

clear in interface Cache

numEntries

public int numEntries()

Description copied from interface: Cache

Answer how many entries are in this cache.

Specified by:

numEntries in interface Cache