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Method to access the most recent rating of a set of players. This will be used in msoy to determine recently played games of (facebook) friends.

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git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@859 c613c5cb-e716-0410-b11b-feb51c14d237
This commit is contained in:
Jamie Doornbos
2009-07-03 00:38:10 +00:00
parent 44fd4d63f3
commit acb856c9cf
1 changed files with 38 additions and 0 deletions
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src/java/com/threerings/parlor/rating/server/persist/RatingRepository.java
+38
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@@ -35,9 +35,12 @@ import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.samskivert.util.IntMap;
import com.samskivert.util.IntMaps;
import com.samskivert.util.IntSet;
import com.samskivert.depot.DepotRepository;
import com.samskivert.depot.Ops;
import com.samskivert.depot.PersistenceContext;
import com.samskivert.depot.PersistentRecord;
import com.samskivert.depot.clause.Limit;
@@ -218,6 +221,41 @@ public class RatingRepository extends DepotRepository
deleteAll(RatingRecord.class, new Where(RatingRecord.PLAYER_ID.in(playerIds)), null);
}
/**
* Load the most recently entered rating for each of a collection of players. The search may
* be limited to only negative or positive id's since applications may use the sign to indicate
* game mode.
* @param sign if < 0, load ratings with negative game id; if > 0, positive; if == 0, all.
*/
public Collection<RatingRecord> getMostRecentRatings (
Collection<Integer> playerIds, int gameIdSign)
{
// TODO: Implement "distinct" in depot. Here's the query I'd like to do:
//
// select distinct on ("playerId") * from "RatingRecord" where "playerId" in (...)
// and "gameId" < 0 order by "playerId" desc, "lastUpdated" desc;
//
// (The ordering by playerId seems to only be required to satisfy the distinct request).
// Without distinct, I must load all ratings and throw out all but the first. They're not
// that big, but still.
List<SQLExpression> conditions = Lists.newArrayList();
conditions.add(RatingRecord.PLAYER_ID.in(playerIds));
if (gameIdSign != 0) {
conditions.add(gameIdSign < 0 ?
RatingRecord.GAME_ID.lessThan(0) : RatingRecord.GAME_ID.greaterThan(0));
}
IntMap<RatingRecord> ratings = IntMaps.newHashIntMap();
for (RatingRecord record : findAll(RatingRecord.class, new Where(Ops.and(conditions)),
OrderBy.descending(RatingRecord.LAST_UPDATED))) {
if (ratings.containsKey(record.playerId)) {
continue;
}
ratings.put(record.playerId, record);
}
return ratings.values();
}
@Override
protected void getManagedRecords (Set<Class<? extends PersistentRecord>> classes)
{