Strategy pattern - User persistence - java 8

User.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

class User {
    private final int id;
    private final String username;
    private final String location;

    public User(int id, String username, String location) {
        this.id = id;
        this.username = username;
        this.location = location;
    }

    @Override
    public String toString() {
        return String.format("User{id=%d, username='%s', location='%s'}", id, username, location);
    }
}

UserLoggers.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

import java.util.function.Consumer;

interface UserLoggers {
    Consumer<User> CONSOLE = user -> System.out.format("Logging user [%s] to console...%n", user.toString());
    Consumer<User> SENTRY = user -> System.out.format("Logging user [%s] to sentry...%n", user.toString());

}

UserPersistenceDirector.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

import java.util.function.Consumer;
import java.util.function.Function;

class UserPersistenceDirector {

    private final int userId;
    private final Function<Integer, User> userProvider;
    private final Consumer<User> userPersister;
    private Consumer<User> userLogger;

    public UserPersistenceDirector(int userId, Function<Integer, User> userProvider, Consumer<User> userPersister) {
        this.userId = userId;
        this.userProvider = userProvider;
        this.userPersister = userPersister;
    }

    public UserPersistenceDirector(int userId, Function<Integer, User> userProvider, Consumer<User> userPersister,
                                   Consumer<User> userLogger) {
        this(userId, userProvider, userPersister);
        this.userLogger = userLogger;
    }

    public void persist() {
        final User user = userProvider.apply(userId);
        userLogger.accept(user);
        userPersister.accept(user);
    }
}

UserPersisters.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

import java.util.function.Consumer;

interface UserPersisters {
    Consumer<User> MONGO = user -> System.out.format("Persisting user [%s] to Mongo DB...%n", user.toString());
    Consumer<User> MYSQL = user -> System.out.format("Persisting user [%s] to MySQL DB...%n", user.toString());
}

UserPersistMain.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

import com.google.common.collect.ImmutableMap;

import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Function;

public class UserPersistMain {

    private static final Map<String, Function<Integer, User>> userProviderMapping = ImmutableMap.of(
            "fs-provider", UserProviders.FILE_SYSTEM,
            "web-service-provider", UserProviders.WEB_SERVICE
    );

    private static final Map<String, Consumer<User>> userPersisterMapping = ImmutableMap.of(
            "mongo-persister", UserPersisters.MONGO,
            "mysql-persister", UserPersisters.MYSQL
    );

    private static final Map<String, Consumer<User>> userLoggerMapping = ImmutableMap.of(
            "console-logger", UserLoggers.CONSOLE,
            "sentry-logger", UserLoggers.SENTRY
    );

    public static void main(String[] args) {
        int userId = Integer.parseInt(args[0]);
        final Function<Integer, User> userProvider = userProviderMapping.get(args[1]);
        final Consumer<User> userPersister = userPersisterMapping.get(args[2]);
        final Consumer<User> userLogger = args.length == 4 ? userLoggerMapping.get(args[3]) : UserLoggers.CONSOLE;

        new UserPersistenceDirector(userId, userProvider, userPersister, userLogger).persist();
    }
}

UserProviders.java

package rs.dodalovic.design_patterns.behavioral.strategy.user_persistence;

import java.util.function.Function;

interface UserProviders {
    Function<Integer, User> FILE_SYSTEM = userId -> {
        System.out.println("Retrieving user data from file system...");
        return new User(userId, "Mike", "United States");
    };
    Function<Integer, User> WEB_SERVICE = userId -> {
        System.out.println("Retrieving user data from web service...");
        return new User(userId, "Jane", "Canada");
    };
}