QRouland/M2MovieRecommander
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variante V1 et V2 Neo4J

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This commit is contained in:
DonRenando 2016-12-07 22:10:53 +01:00
parent 61a94d0e2c
commit ece2fef6ac
3 changed files with 173 additions and 123 deletions
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28
src/main/java/com/camillepradel/movierecommender/controller/MainController.java
View File

@ -1,6 +1,5 @@
package com.camillepradel.movierecommender.controller;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
@ -11,7 +10,6 @@ import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.bind.annotation.RequestMethod;
import com.camillepradel.movierecommender.model.Genre;
import com.camillepradel.movierecommender.model.Movie;
import com.camillepradel.movierecommender.model.Rating;
@ -80,25 +78,15 @@ public class MainController {
@RequestParam(value = "processing_mode", required = false, defaultValue = "0") Integer processingMode){
System.out.println("GET /movieratings for user " + userId);
// TODO: process recommendations for specified user exploiting other users ratings
// use different methods depending on processingMode parameter
Genre genre0 = new Genre(0, "genre0");
Genre genre1 = new Genre(1, "genre1");
Genre genre2 = new Genre(2, "genre2");
List<Rating> recommendations = new LinkedList<Rating>();
String titlePrefix;
if (processingMode.equals(0))
titlePrefix = "0_";
else if (processingMode.equals(1))
titlePrefix = "1_";
else if (processingMode.equals(2))
titlePrefix = "2_";
else
titlePrefix = "default_";
recommendations.add(new Rating(new Movie(0, titlePrefix + "Titre 0", Arrays.asList(new Genre[] {genre0, genre1})), userId, 5));
recommendations.add(new Rating(new Movie(1, titlePrefix + "Titre 1", Arrays.asList(new Genre[] {genre0, genre2})), userId, 5));
recommendations.add(new Rating(new Movie(2, titlePrefix + "Titre 2", Arrays.asList(new Genre[] {genre1})), userId, 4));
recommendations.add(new Rating(new Movie(3, titlePrefix + "Titre 3", Arrays.asList(new Genre[] {genre0, genre1, genre2})), userId, 3));
if (processingMode.equals(1)){
recommendations = Neo4JController.ProcessRecommendationV1(userId);
}
else if (processingMode.equals(2)){
recommendations = Neo4JController.ProcessRecommendationV2(userId);
}
ModelAndView mv = new ModelAndView("recommendations");
mv.addObject("recommendations", recommendations);

148
src/main/java/com/camillepradel/movierecommender/controller/Neo4JController.java
View File

@ -22,74 +22,69 @@ import org.neo4j.driver.v1.StatementResult;
*/
public class Neo4JController {
public static List<Movie>getMoviesNeo4JByUser (Integer userId){
public static List<Movie> getMoviesNeo4JByUser(Integer userId) {
List<Movie> movies = new LinkedList<Movie>();
int id=0;
int id = 0;
StatementResult result = null;
try {
if (userId != null && userId >=0 ){
if (userId != null && userId >= 0) {
result = Neo4jConnector.getInstance().getConnection().run( "MATCH (me:User { id: "+userId+" })-[:RATED]->(movie:Movie) -[:CATEGORIZED_AS]->(g:Genre) RETURN movie.title as movies, collect(g.name) as genre;" );
}
else{
result = Neo4jConnector.getInstance().getConnection().run( "MATCH (m:Movie) -[:CATEGORIZED_AS]->(g:Genre) RETURN m.title as movies, collect(g.name) as genre;" );
result = Neo4jConnector.getInstance().getConnection().run("MATCH (me:User { id: " + userId + " })-[:RATED]->(movie:Movie) -[:CATEGORIZED_AS]->(g:Genre) RETURN movie.title as movies, collect(g.name) as genre;");
} else {
result = Neo4jConnector.getInstance().getConnection().run("MATCH (m:Movie) -[:CATEGORIZED_AS]->(g:Genre) RETURN m.title as movies, collect(g.name) as genre;");
}
} catch (ConnectException ex) {
Logger.getLogger(MainController.class.getName()).log(Level.SEVERE, null, ex);
}
finally{
} finally {
Neo4jConnector.getInstance().close();
}
while ( result.hasNext() )
{
while (result.hasNext()) {
Record record = result.next();
String[] listGenre = record.get("genre").toString().split(",");
List<Genre> listTypeGenre = new LinkedList<Genre>();
for(String g : listGenre){
if(g != null)
for (String g : listGenre) {
if (g != null) {
listTypeGenre.add(new Genre(id, g.replace("\"", "").replace("[", "").replace("]", "")));
}
}
movies.add(new Movie(id, record.get("movies").asString(), (listTypeGenre.isEmpty())?null:listTypeGenre ) );
id+=1;
movies.add(new Movie(id, record.get("movies").asString(), (listTypeGenre.isEmpty()) ? null : listTypeGenre));
id += 1;
}
return movies;
}
public static List<Rating>GetMoviesRatingNeo4JByUser(Integer userId){
public static List<Rating> GetMoviesRatingNeo4JByUser(Integer userId) {
List<Rating> moviesRating = new LinkedList<Rating>();
StatementResult result = null;
try {
if (userId != null && userId >=0 ){
if (userId != null && userId >= 0) {
result = Neo4jConnector.getInstance().getConnection().run( "MATCH (u:User{id:"+userId+"})-[r:RATED]->(m:Movie)-[:CATEGORIZED_AS]->(g:Genre) RETURN m.id AS id, m.title AS title, collect(g.name) AS genre, r.note AS note ORDER BY id" );
}
else{
result = Neo4jConnector.getInstance().getConnection().run("MATCH (u:User{id:" + userId + "})-[r:RATED]->(m:Movie)-[:CATEGORIZED_AS]->(g:Genre) RETURN m.id AS id, m.title AS title, collect(g.name) AS genre, r.note AS note ORDER BY id");
} else {
return null;
}
} catch (ConnectException ex) {
Logger.getLogger(MainController.class.getName()).log(Level.SEVERE, null, ex);
}
finally{
} finally {
Neo4jConnector.getInstance().close();
}
Movie movie = null;
Rating rate = null;
while ( result.hasNext() )
{
while (result.hasNext()) {
Record record = result.next();
System.out.println(record.get("p").toString());
String[] listGenre = record.get("genre").toString().split(",");
List<Genre> listTypeGenre = new LinkedList<Genre>();
for(String g : listGenre){
if(g != null)
for (String g : listGenre) {
if (g != null) {
listTypeGenre.add(new Genre(0, g.replace("\"", "").replace("[", "").replace("]", "")));
}
}
movie = new Movie(record.get("id").asInt(), record.get("title").asString(),listTypeGenre );
movie = new Movie(record.get("id").asInt(), record.get("title").asString(), listTypeGenre);
rate = new Rating(movie, userId, record.get("note").asInt());
moviesRating.add(rate);
}
@ -97,37 +92,106 @@ public class Neo4JController {
}
public static void updateMovieRatingNeo4J(Rating note){
public static void updateMovieRatingNeo4J(Rating note) {
Integer user_id = note.getUserId();
try {
if (user_id != null && user_id >=0 ){
if (user_id != null && user_id >= 0) {
Neo4jConnector.getInstance().getConnection().run( "MATCH (u:User{id:"+user_id+"})-[r:RATED]->(m:Movie)\n" +
"where m.id ="+note.getMovie().getId()+"\n" +
"delete r" );
Neo4jConnector.getInstance().getConnection().run("MATCH (u:User{id:" + user_id + "})-[r:RATED]->(m:Movie)\n"
+ "where m.id =" + note.getMovie().getId() + "\n"
+ "delete r");
}
} catch (ConnectException ex) {
System.out.println(ex);
}
finally{
} finally {
Neo4jConnector.getInstance().close();
}
try {
Neo4jConnector.getInstance().getConnection().run( "MATCH (u:User{id:"+user_id+"}),(m:Movie)\n" +
"where m.id = "+note.getMovie().getId()+"\n" +
"CREATE (u)-[r:RATED{note:"+note.getScore()+", timestamp: "+System.currentTimeMillis()+"}]->(m) \n" +
"RETURN *" );
Neo4jConnector.getInstance().getConnection().run("MATCH (u:User{id:" + user_id + "}),(m:Movie)\n"
+ "where m.id = " + note.getMovie().getId() + "\n"
+ "CREATE (u)-[r:RATED{note:" + note.getScore() + ", timestamp: " + System.currentTimeMillis() + "}]->(m) \n"
+ "RETURN *");
} catch (ConnectException ex) {
System.out.println(ex);
}
finally{
} finally {
Neo4jConnector.getInstance().close();
}
}
public static List<Rating> ProcessRecommendationV1(Integer userId) {
List<Rating> ratings = new LinkedList<Rating>();
StatementResult result = null;
try {
result = Neo4jConnector.getInstance().getConnection().run("MATCH (target_user:User {id : " + userId + "})-[:RATED]->(m:Movie)<-[:RATED]-(other_user:User)\n"
+ "WITH other_user, count(distinct m.title) AS num_common_movies, target_user\n"
+ "ORDER BY num_common_movies DESC\n"
+ "LIMIT 1\n"
+ "MATCH (other_user)-[rat_other_user:RATED]->(m2:Movie)\n"
+ "WHERE NOT ((target_user)-[:RATED]->(m2))\n"
+ "RETURN m2.id AS mov_id, m2.title AS rec_movie_title, rat_other_user.note AS rating, other_user.id AS watched_by\n"
+ "ORDER BY rat_other_user.note DESC");
} catch (ConnectException ex) {
Logger.getLogger(Neo4JController.class.getName()).log(Level.SEVERE, null, ex);
} finally {
Neo4jConnector.getInstance().close();
}
Record record = null;
int idMovie = 0;
String titre = "";
int note = 0;
while (result.hasNext()) {
record = result.next();
idMovie = record.get("mov_id").asInt();
titre = record.get("rec_movie_title").asString();
note = record.get("rating").asInt();
System.out.println(titre);
ratings.add(new Rating(new Movie(idMovie, titre,null), userId, note));
}
return ratings;
}
public static List<Rating> ProcessRecommendationV2(Integer userId) {
List<Rating> ratings = new LinkedList<Rating>();
StatementResult result = null;
try {
result = Neo4jConnector.getInstance().getConnection().run("MATCH (target_user:User {id : " + userId + "})-[:RATED]->(m:Movie)<-[:RATED]-(other_user:User)\n"
+ "WITH other_user, count(distinct m.title) AS num_common_movies, target_user\n"
+ "ORDER BY num_common_movies DESC\n"
+ "LIMIT 5\n"
+ "MATCH (other_user)-[rat_other_user:RATED]->(m2:Movie)\n"
+ "WHERE NOT ((target_user)-[:RATED]->(m2))\n"
+ "RETURN m2.id AS mov_id, m2.title AS rec_movie_title, rat_other_user.note AS rating, other_user.id AS watched_by\n"
+ "ORDER BY rat_other_user.note DESC");
} catch (ConnectException ex) {
Logger.getLogger(Neo4JController.class.getName()).log(Level.SEVERE, null, ex);
} finally {
Neo4jConnector.getInstance().close();
}
Record record = null;
int idMovie = 0;
String titre = "";
int note = 0;
while (result.hasNext()) {
record = result.next();
idMovie = record.get("mov_id").asInt();
titre = record.get("rec_movie_title").asString();
note = record.get("rating").asInt();
ratings.add(new Rating(new Movie(idMovie, titre,null), userId, note));
}
return ratings;
}
}

4
src/main/webapp/WEB-INF/views/recommendations.jsp
View File

@ -13,9 +13,7 @@
</h1>
<ul>
<c:forEach items="${recommendations}" var="recommendation">
<li>
${recommendation.getMovie().title}
</li>
<li>${recommendation.movie.title} - ${recommendation.score} / 5</li>
</c:forEach>
</ul>