org.apache.mahout.cf.taste.common
Interface Refreshable
- All Known Subinterfaces:
- ClusteringRecommender, ClusterSimilarity, DataModel, DiffStorage, Factorizer, IDMigrator, ItemBasedRecommender, ItemSimilarity, JDBCDataModel, PreferenceInferrer, PreferenceTransform, Recommender, SimilarityTransform, UpdatableIDMigrator, UserBasedRecommender, UserNeighborhood, UserSimilarity
- All Known Implementing Classes:
- AbstractBooleanPrefJDBCDataModel, AbstractDataModel, AbstractFactorizer, AbstractIDMigrator, AbstractItemSimilarity, AbstractJDBCDataModel, AbstractJDBCDiffStorage, AbstractJDBCIDMigrator, AbstractJDBCItemSimilarity, AbstractRecommender, ALSWRFactorizer, AveragingPreferenceInferrer, CachingItemSimilarity, CachingRecommender, CachingUserNeighborhood, CachingUserSimilarity, CaseAmplification, CityBlockSimilarity, EuclideanDistanceSimilarity, ExpectationMaximizationSVDFactorizer, FarthestNeighborClusterSimilarity, FileDataModel, FileDiffStorage, FileIDMigrator, FileItemSimilarity, GenericBooleanPrefDataModel, GenericBooleanPrefItemBasedRecommender, GenericBooleanPrefUserBasedRecommender, GenericDataModel, GenericItemBasedRecommender, GenericItemSimilarity, GenericJDBCDataModel, GenericUserBasedRecommender, GenericUserSimilarity, InverseUserFrequency, ItemAverageRecommender, ItemUserAverageRecommender, KnnItemBasedRecommender, LogLikelihoodSimilarity, MemoryDiffStorage, MemoryIDMigrator, MySQLBooleanPrefJDBCDataModel, MySQLJDBCDataModel, MySQLJDBCDiffStorage, MySQLJDBCIDMigrator, MySQLJDBCInMemoryItemSimilarity, MySQLJDBCItemSimilarity, NearestNeighborClusterSimilarity, NearestNUserNeighborhood, PearsonCorrelationSimilarity, PlusAnonymousUserDataModel, PostgreSQLBooleanPrefJDBCDataModel, PostgreSQLJDBCDataModel, RandomRecommender, RefreshHelper, ReloadFromJDBCDataModel, SlopeOneRecommender, SpearmanCorrelationSimilarity, SVDRecommender, TanimotoCoefficientSimilarity, ThresholdUserNeighborhood, TreeClusteringRecommender, TreeClusteringRecommender2, UncenteredCosineSimilarity, ZScore
public interface Refreshable
Implementations of this interface have state that can be periodically refreshed. For example, an
implementation instance might contain some pre-computed information that should be periodically refreshed.
The refresh(Collection)
method triggers such a refresh.
All Taste components implement this. In particular,
Recommender
s do. Callers may want to call
refresh(Collection)
periodically to re-compute information throughout the system and bring it up
to date, though this operation may be expensive.
refresh
void refresh(Collection<Refreshable> alreadyRefreshed)
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
- Parameters:
alreadyRefreshed
- s that are known to have already been
refreshed as a result of an initial call to a method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.
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