org.apache.mahout.cf.taste.impl.neighborhood
Class CachingUserNeighborhood
java.lang.Object
org.apache.mahout.cf.taste.impl.neighborhood.CachingUserNeighborhood
- All Implemented Interfaces:
- Refreshable, UserNeighborhood
public final class CachingUserNeighborhood
- extends Object
- implements UserNeighborhood
A caching wrapper around an underlying UserNeighborhood
implementation.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
CachingUserNeighborhood
public CachingUserNeighborhood(UserNeighborhood neighborhood,
DataModel dataModel)
throws TasteException
- Throws:
TasteException
getUserNeighborhood
public long[] getUserNeighborhood(long userID)
throws TasteException
- Specified by:
getUserNeighborhood
in interface UserNeighborhood
- Parameters:
userID
- ID of user for which a neighborhood will be computed
- Returns:
- IDs of users in the neighborhood
- Throws:
TasteException
- if an error occurs while accessing data
refresh
public void refresh(Collection<Refreshable> alreadyRefreshed)
- Description copied from interface:
Refreshable
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
Refreshable
should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
- Specified by:
refresh
in interface Refreshable
- Parameters:
alreadyRefreshed
- Refreshable
s that are known to have already been
refreshed as a result of an initial call to a Refreshable.refresh(Collection)
method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.
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