org.revenj.database.postgres.jinq

Class RevenjQueryComposerCache

java.lang.Object

org.revenj.database.postgres.jinq.RevenjQueryComposerCache

public final class RevenjQueryComposerCache
extends Object

Constructor Summary

Constructors

Constructor and Description
RevenjQueryComposerCache()

Method Summary

Modifier and Type	Method and Description
Optional<JinqPostgresQuery<?>>	cacheFindAll(String dataSource, Optional<JinqPostgresQuery<?>> queryToCache) Caches a query for finding all the entities of a certain type
Optional<JinqPostgresQuery<?>>	cacheQuery(JinqPostgresQuery<?> base, String transformationType, String[] lambdaSources, Optional<JinqPostgresQuery<?>> resultingQuery) Inserts a transformed query into the cache.
Optional<JinqPostgresQuery<?>>	findCachedFindAll(String dataSource) Checks if a query for finding all the entities of a certain type has already been cached
Optional<JinqPostgresQuery<?>>	findInCache(JinqPostgresQuery<?> base, String transformationType, String[] lambdaSources) Looks up whether a certain transformation is already in the cache or not.

Methods inherited from class java.lang.Object

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

Constructor Detail

RevenjQueryComposerCache

public RevenjQueryComposerCache()

Method Detail

findInCache

public Optional<JinqPostgresQuery<?>> findInCache(JinqPostgresQuery<?> base,
                                                  String transformationType,
                                                  String[] lambdaSources)

Looks up whether a certain transformation is already in the cache or not.

Parameters:

base - query being transformed

transformationType - type of transformation being applied to the query

lambdaSources - array of descriptions of the lambdas used in the query

Returns:

cached transformation result or null if this transformation hasn't been cached

cacheQuery

public Optional<JinqPostgresQuery<?>> cacheQuery(JinqPostgresQuery<?> base,
                                                 String transformationType,
                                                 String[] lambdaSources,
                                                 Optional<JinqPostgresQuery<?>> resultingQuery)

Inserts a transformed query into the cache. If a cache entry is already present, it returns the cached entry; otherwise, it returns resultingQuery

Parameters:

base - query being transformed

transformationType - type of transformation applied to the query

lambdaSources - array of descriptions of the lambdas used in the query

resultingQuery - result of the transformation that should be cached

Returns:

the existing cached entry or resultingQuery if nothing is cached

findCachedFindAll

public Optional<JinqPostgresQuery<?>> findCachedFindAll(String dataSource)

Checks if a query for finding all the entities of a certain type has already been cached

Parameters:

dataSource - name of the type of entity the query should return

Returns:

the cached query or null if no query has been cached.

cacheFindAll

public Optional<JinqPostgresQuery<?>> cacheFindAll(String dataSource,
                                                   Optional<JinqPostgresQuery<?>> queryToCache)

Caches a query for finding all the entities of a certain type

Parameters:

dataSource - the name of the entity the query returns

queryToCache - a query that returns all of the entities of the given type. queryToCache can be null if the programmer just wants to see if a certain query is already in the cache but doesn't want to insert a new query.

Returns:

if a query has already been cached, that query is returned; otherwise, queryToCache is inserted into the cache and returned.