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Online player score ranking

Last Updated: Jul 14, 2017

Scenario introduction

ApsaraDB for Redis functions basically the same as Redis. You can use this product to create a ranking function for an online game easily.

Sample code

  1. import java.util.ArrayList;
  2. import java.util.List;
  3. import java.util.Set;
  4. import java.util.UUID;
  6. import redis.clients.jedis.Jedis;
  7. import redis.clients.jedis.Tuple;
  9. public class GameRankSample {
  11.     static int TOTAL_SIZE = 20;
  13.     public static void main(String[] args) 
  14.     {
  15.         //Connection information, obtained from the console
  16.         String host = "xxxxxxxxxx.m.cnhz1.kvstore.aliyuncs.com";
  17.         int port = 6379;
  19.         Jedis jedis = new Jedis(host, port);
  21.         try {
  22.             //Instance password
  23.             String authString = jedis.auth("password");//password
  25.             if (!authString.equals("OK"))
  26.             {
  27.                 System.err.println("AUTH Failed: " + authString);
  28.                 return;
  29.             }
  31.             //Key
  32.             String key = "Game name：Keep Running, Ali!";
  34.             //Clear any data that already exists
  35.             jedis.del(key);
  37.             //Generate several simulated players
  38.             List<String> playerList = new ArrayList<String>();
  39.             for (int i = 0; i < TOTAL_SIZE; ++i)
  40.             {
  41.                 //Randomly generate an ID for each player
  42.                 playerList.add(UUID.randomUUID().toString());
  43.             }
  46.             System.out.println("Input all players");
  47.             //Record the score for each player
  48.             for (int i = 0; i < playerList.size(); i++)
  49.             {
  50.                 //Randomly generate numbers as the scores of the simulated players
  51.                 int score = (int)(Math.random()*5000);
  53.                 String member = playerList.get(i);
  55.                 System.out.println("Player ID：" + member + "， Player score: " + score);
  57.                 //Add the player ID and score to the SortedSet of the corresponding key
  58.                 jedis.zadd(key, score, member);
  60.             }
  62.             //Print out the ranking of all players
  63.             System.out.println();
  64.             System.out.println("       "+key);
  65.             System.out.println("       All players ranking                    ");
  67.             //Obtain the sorted list of players from the SortedSet of the corresponding key
  68.             Set<Tuple> scoreList = jedis.zrevrangeWithScores(key, 0, -1);
  69.             for (Tuple item : scoreList) {  
  70.                 System.out.println("Player ID："+item.getElement()+"， Player score:"+Double.valueOf(item.getScore()).intValue());
  71.             }  
  73.             //Print out Top 5 players
  74.             System.out.println();
  75.             System.out.println("       "+key);
  76.             System.out.println("       Top players");
  78.             scoreList = jedis.zrevrangeWithScores(key, 0, 4);
  79.             for (Tuple item : scoreList) {  
  80.                 System.out.println("Player ID："+item.getElement()+"， Player score:"+Double.valueOf(item.getScore()).intValue());
  81.             }
  83.             //Print out a list of specific players
  84.             System.out.println();
  85.             System.out.println("         "+key);
  86.             System.out.println("          players with scores from 1000 to 2000");
  88.             //Obtain a list of players with scores from 1000 to 2000 from the SortedSet of the corresponding key
  89.             scoreList = jedis.zrangeByScoreWithScores(key, 1000, 2000);
  90.             for (Tuple item : scoreList) {  
  91.                 System.out.println("Player ID："+item.getElement()+"， Player score:"+Double.valueOf(item.getScore()).intValue());
  92.             } 
  94.         } catch (Exception e) {
  95.             e.printStackTrace();
  96.         }finally{
  97.             jedis.quit();
  98.             jedis.close();
  99.         }
  100.     }
  101. }

Output

After you access the ApsaraDB for Redis instance with the correct address and password and run the above Java code, the following output is displayed:

  1. Enter all players 
  2. Player ID: 9193e26f-6a71-4c76-8666-eaf8ee97ac86; score: 3860
  3. Player ID: db03520b-75a3-48e5-850a-071722ff7afb; score: 4853
  4. Player ID: d302d24d-d380-4e15-a4d6-84f71313f27a; score: 2931
  5. Player ID: bee46f9d-4b05-425e-8451-8aa6d48858e6; score: 1796
  6. Player ID: ec24fb9e-366e-4b89-a0d5-0be151a8cad0; score: 2263
  7. Player ID: e11ecc2c-cd51-4339-8412-c711142ca7aa; score: 1848
  8. Player ID: 4c396f67-da7c-4b99-a783-25919d52d756; score: 958
  9. Player ID: a6299dd2-4f38-4528-bb5a-aa2d48a9f94a; score: 2428
  10. Player ID: 2e4ec631-1e4e-4ef0-914f-7bf1745f7d65; score: 4478
  11. Player ID: 24235a85-85b9-476e-8b96-39f294f57aa7; score: 1655
  12. Player ID: e3e8e1fa-6aac-4a0c-af80-4c4a1e126cd1; score: 4064
  13. Player ID: 99bc5b4f-e32a-4295-bc3a-0324887bb77e; score: 4852
  14. Player ID: 19e2aa6b-a2d8-4e56-bdf7-8b59f64bd8e0; score: 3394
  15. Player ID: cb62bb24-1318-4af2-9d9b-fbff7280dbec; score: 3405
  16. Player ID: ec0f06da-91ee-447b-b935-7ca935dc7968; score: 4391
  17. Player ID: 2c814a6f-3706-4280-9085-5fe5fd56b71c; score: 2510
  18. Player ID: 9ee2ed6d-08b8-4e7f-b52c-9adfe1e32dda; score: 63
  19. Player ID: 0293b43a-1554-4157-a95b-b78de9edf6dd; score: 1008
  20. Player ID: 674bbdd1-2023-46ae-bbe6-dfcd8e372430; score: 2265
  21. Player ID: 34574e3e-9cc5-43ed-ba15-9f5405312692; score: 3734
  23.               Game Name: Keep Running, Ali!                    
  24.               Full Player Ranking                    
  25. Player ID: db03520b-75a3-48e5-850a-071722ff7afb; score: 4853
  26. Player ID: 99bc5b4f-e32a-4295-bc3a-0324887bb77e; score: 4852
  27. Player ID: 2e4ec631-1e4e-4ef0-914f-7bf1745f7d65; score: 4478
  28. Player ID: ec0f06da-91ee-447b-b935-7ca935dc7968; score: 4391
  29. Player ID: e3e8e1fa-6aac-4a0c-af80-4c4a1e126cd1; score: 4064
  30. Player ID: 9193e26f-6a71-4c76-8666-eaf8ee97ac86; score: 3860
  31. Player ID: 34574e3e-9cc5-43ed-ba15-9f5405312692; score: 3734
  32. Player ID: cb62bb24-1318-4af2-9d9b-fbff7280dbec; score: 3405
  33. Player ID: 19e2aa6b-a2d8-4e56-bdf7-8b59f64bd8e0; score: 3394
  34. Player ID: d302d24d-d380-4e15-a4d6-84f71313f27a; score: 2931
  35. Player ID: 2c814a6f-3706-4280-9085-5fe5fd56b71c; score: 2510
  36. Player ID: a6299dd2-4f38-4528-bb5a-aa2d48a9f94a; score: 2428
  37. Player ID: 674bbdd1-2023-46ae-bbe6-dfcd8e372430; score: 2265
  38. Player ID: ec24fb9e-366e-4b89-a0d5-0be151a8cad0; score: 2263
  39. Player ID: e11ecc2c-cd51-4339-8412-c711142ca7aa; score: 1848
  40. Player ID: bee46f9d-4b05-425e-8451-8aa6d48858e6; score: 1796
  41. Player ID: 24235a85-85b9-476e-8b96-39f294f57aa7; score: 1655
  42. Player ID: 0293b43a-1554-4157-a95b-b78de9edf6dd; score: 1008
  43. Player ID: 4c396f67-da7c-4b99-a783-25919d52d756; score: 958
  44. Player ID: 9ee2ed6d-08b8-4e7f-b52c-9adfe1e32dda; score: 63
  46.       Game Name: Keep Running, Ali!                    
  47.          Top Players                    
  48. Player ID: db03520b-75a3-48e5-850a-071722ff7afb; score: 4853
  49. Player ID: 99bc5b4f-e32a-4295-bc3a-0324887bb77e; score: 4852
  50. Player ID: 2e4ec631-1e4e-4ef0-914f-7bf1745f7d65; score: 4478
  51. Player ID: ec0f06da-91ee-447b-b935-7ca935dc7968; score: 4391
  52. Player ID: e3e8e1fa-6aac-4a0c-af80-4c4a1e126cd1; score: 4064
  54.           Game Name: Keep Running, Ali!                    
  55.           Players with Scores from 1000 to 2000              
  56. Player ID: 0293b43a-1554-4157-a95b-b78de9edf6dd; score: 1008
  57. Player ID: 24235a85-85b9-476e-8b96-39f294f57aa7; score: 1655
  58. Player ID: bee46f9d-4b05-425e-8451-8aa6d48858e6; score: 1796
  59. Player ID: e11ecc2c-cd51-4339-8412-c711142ca7aa; score: 1848
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