QRouland/M2MovieRecommander
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mongodb recommendation V1

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This commit is contained in:
Quentin Rouland 2016-12-11 01:03:04 +01:00
parent 72b75d938c
commit b36df03f9a
1 changed files with 106 additions and 2 deletions
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108
src/main/java/com/camillepradel/movierecommender/controller/MongoDBController.java
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@ -8,7 +8,10 @@ package com.camillepradel.movierecommender.controller;
import com.camillepradel.movierecommender.model.Genre;
import com.camillepradel.movierecommender.model.Movie;
import com.camillepradel.movierecommender.model.Rating;
import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.client.AggregateIterable;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
@ -16,6 +19,7 @@ import com.mongodb.client.MongoDatabase;
import static com.mongodb.client.model.Filters.eq;
import com.mongodb.client.model.UpdateOptions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
@ -157,8 +161,108 @@ public class MongoDBController implements DBControllerInterface {
}
public List<Rating> ProcessRecommendationV1(Integer userId) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
MongoDatabase db = MongoDBConnector.getInstance().getConnexion();
MongoCollection<Document> users = db.getCollection("users");
BasicDBObject project;
BasicDBObject match;
BasicDBObject sort;
BasicDBObject limit;
BasicDBObject unwind;
BasicDBObject group;
project = new BasicDBObject("$project",
new BasicDBObject("moviesid", "$movies.movieid")
);
match = new BasicDBObject("$match",
new BasicDBObject("_id", new BasicDBObject("$eq", userId))
);
AggregateIterable<Document> output = users.aggregate(Arrays.asList(project, match));
final Document moviesid = output.first();
BasicDBList intersectionList = new BasicDBList();
intersectionList.add("$movies.movieid" );
intersectionList.add( moviesid.get("moviesid") );
project = new BasicDBObject("$project",
new BasicDBObject("nbMoviesIntersect",
new BasicDBObject("$size",
new BasicDBObject("$setIntersection",
intersectionList
)
)
)
);
match = new BasicDBObject("$match",
new BasicDBObject("_id", new BasicDBObject("$ne", userId))
);
sort = new BasicDBObject("$sort",
new BasicDBObject("nbMoviesIntersect", -1)
);
limit = new BasicDBObject("$limit", 5);
output = users.aggregate(Arrays.asList(project, match, sort, limit));
Document simUser = output.first();
unwind = new BasicDBObject("$unwind", "$movies");
match = new BasicDBObject("$match",
new BasicDBObject()
.append("_id", simUser.getInteger("_id"))
.append("movies.movieid", new BasicDBObject("$nin", moviesid.get("moviesid")))
);
group = new BasicDBObject("$group", new BasicDBObject()
.append("movies", new BasicDBObject("$push", "$movies"))
);
sort = new BasicDBObject("$sort", new BasicDBObject("movies.rating", -1));
output = users.aggregate(Arrays.asList(unwind, match, sort, group));
Document listMoviesDiff = output.first();
ArrayList<Rating> listRating= new ArrayList<Rating>();
MongoCollection<Document> movies = db.getCollection("movies");
MongoCursor<Document> cursor;
ArrayList<Document> user_movies = (ArrayList) listMoviesDiff.get("movies");
BasicDBObject inQuery = new BasicDBObject();
HashMap<Integer,Integer> list = new HashMap<Integer,Integer>();
for(Document movie : user_movies )
list.put(movie.getInteger("movieid"), movie.getInteger("rating"));
inQuery.put("_id", new BasicDBObject("$in", list.keySet()));
cursor = movies.find(inQuery).iterator();
HashMap<Integer,Rating> hashMoviesRating = new HashMap<Integer,Rating>();
while (cursor.hasNext()) {
Document movie = cursor.next();
String[] genres;
genres = movie.getString("genres").split("\\|");
ArrayList<Genre> listGenres = new ArrayList<Genre>();
for(String genre : genres){
listGenres.add(new Genre(1,genre));
}
hashMoviesRating.put(movie.getInteger("_id"),
new Rating(new Movie(movie.getInteger("_id"), movie.getString("title"), listGenres),
userId, list.get(movie.getInteger("_id"))));
}
for(Document movie : user_movies )
listRating.add(hashMoviesRating.get(movie.getInteger("movieid")));
return listRating;
}
public List<Rating> ProcessRecommendationV2(Integer userId) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.