redis-投票

 package redis.inaction;

 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.ZParams;

 import java.util.*;

 public class Chapter01 {
     private static final int ONE_WEEK_IN_SECONDS = 7 * 86400;
     private static final int VOTE_SCORE = 432;
     private static final int ARTICLES_PER_PAGE = 25;

     public static final void main(String[] args) {
         new Chapter01().run();
     }

     public void run() {
         Jedis conn = new Jedis("192.168.7.146",6379);
         conn.select(15);
         conn.flushAll();
         String articleId = postArticle(
             conn, "username", "A title", "http://www.google.com");
         System.out.println("We posted a new article with id: " + articleId);
         System.out.println("Its HASH looks like:");
         Map<String,String> articleData = conn.hgetAll("article:" + articleId);
         for (Map.Entry<String,String> entry : articleData.entrySet()){
             System.out.println("  " + entry.getKey() + ": " + entry.getValue());
         }

         System.out.println();

         articleVote(conn, "other_user", "article:" + articleId);
         String votes = conn.hget("article:" + articleId, "votes");
         System.out.println("We voted for the article, it now has votes: " + votes);
         assert Integer.parseInt(votes) > 1;

         System.out.println("The currently highest-scoring articles are:");
         List<Map<String,String>> articles = getArticles(conn, 1);
         printArticles(articles);
         assert articles.size() >= 1;

         addGroups(conn, articleId, new String[]{"new-group"});
         System.out.println("We added the article to a new group, other articles include:");
         articles = getGroupArticles(conn, "new-group", 1);
         printArticles(articles);
         assert articles.size() >= 1;
     }

     public String postArticle(Jedis conn, String user, String title, String link) {
         String articleId = String.valueOf(conn.incr("article:"));

         String voted = "voted:" + articleId;
         conn.sadd(voted, user);
         conn.expire(voted, ONE_WEEK_IN_SECONDS);

         long now = System.currentTimeMillis() / 1000;
         String article = "article:" + articleId;
         HashMap<String,String> articleData = new HashMap<String,String>();
         articleData.put("title", title);
         articleData.put("link", link);
         articleData.put("user", user);
         articleData.put("now", String.valueOf(now));
         articleData.put("votes", "1");
         conn.hmset(article, articleData);
         conn.zadd("score:", now + VOTE_SCORE, article);
         conn.zadd("time:", now, article);

         return articleId;
     }

     public void articleVote(Jedis conn, String user, String article) {
         long cutoff = (System.currentTimeMillis() / 1000) - ONE_WEEK_IN_SECONDS;
         if (conn.zscore("time:", article) < cutoff){
             return;
         }

         String articleId = article.substring(article.indexOf(':') + 1);
         if (conn.sadd("voted:" + articleId, user) == 1) {
             conn.zincrby("score:", VOTE_SCORE, article);
             conn.hincrBy(article, "votes", 1);
         }
     }

     public List<Map<String,String>> getArticles(Jedis conn, int page) {
         return getArticles(conn, page, "score:");
     }

     public List<Map<String,String>> getArticles(Jedis conn, int page, String order) {
          int start = (page - 1) * ARTICLES_PER_PAGE;
         int end = start + ARTICLES_PER_PAGE - 1;

         Set<String> ids = conn.zrevrange(order, start, end);
         List<Map<String,String>> articles = new ArrayList<Map<String,String>>();
         for (String id : ids){
             Map<String,String> articleData = conn.hgetAll(id);
             articleData.put("id", id);
             articles.add(articleData);
         }

         return articles;
     }

     public void addGroups(Jedis conn, String articleId, String[] toAdd) {
         String article = "article:" + articleId;
         for (String group : toAdd) {
             conn.sadd("group:" + group, article);
         }
     }

     public List<Map<String,String>> getGroupArticles(Jedis conn, String group, int page) {
         return getGroupArticles(conn, group, page, "score:");
     }

     public List<Map<String,String>> getGroupArticles(Jedis conn, String group, int page, String order) {
         String key = order + group;
         if (!conn.exists(key)) {
             ZParams params = new ZParams().aggregate(ZParams.Aggregate.MAX);
             conn.zinterstore(key, params, "group:" + group, order);
             conn.expire(key, 60);
         }
         return getArticles(conn, page, key);
     }

     private void printArticles(List<Map<String,String>> articles){
         for (Map<String,String> article : articles){
             System.out.println("  id: " + article.get("id"));
             for (Map.Entry<String,String> entry : article.entrySet()){
                 if (entry.getKey().equals("id")){
                     continue;
                 }
                 System.out.println("    " + entry.getKey() + ": " + entry.getValue());
             }
         }
     }
 }

package redis.inaction;
import redis.clients.jedis.Jedis;import redis.clients.jedis.ZParams;
import java.util.*;
public class Chapter01 {    private static final int ONE_WEEK_IN_SECONDS = 7 * 86400;    private static final int VOTE_SCORE = 432;    private static final int ARTICLES_PER_PAGE = 25;
    public static final void main(String[] args) {        new Chapter01().run();    }
    public void run() {        Jedis conn = new Jedis("192.168.7.146",6379);        conn.select(15);        conn.flushAll();        String articleId = postArticle(            conn, "username", "A title", "http://www.google.com");        System.out.println("We posted a new article with id: " + articleId);        System.out.println("Its HASH looks like:");        Map<String,String> articleData = conn.hgetAll("article:" + articleId);        for (Map.Entry<String,String> entry : articleData.entrySet()){            System.out.println("  " + entry.getKey() + ": " + entry.getValue());        }
        System.out.println();
        articleVote(conn, "other_user", "article:" + articleId);        String votes = conn.hget("article:" + articleId, "votes");        System.out.println("We voted for the article, it now has votes: " + votes);        assert Integer.parseInt(votes) > 1;
        System.out.println("The currently highest-scoring articles are:");        List<Map<String,String>> articles = getArticles(conn, 1);        printArticles(articles);        assert articles.size() >= 1;
        addGroups(conn, articleId, new String[]{"new-group"});        System.out.println("We added the article to a new group, other articles include:");        articles = getGroupArticles(conn, "new-group", 1);        printArticles(articles);        assert articles.size() >= 1;    }
    public String postArticle(Jedis conn, String user, String title, String link) {        String articleId = String.valueOf(conn.incr("article:"));
        String voted = "voted:" + articleId;        conn.sadd(voted, user);        conn.expire(voted, ONE_WEEK_IN_SECONDS);
        long now = System.currentTimeMillis() / 1000;        String article = "article:" + articleId;        HashMap<String,String> articleData = new HashMap<String,String>();        articleData.put("title", title);        articleData.put("link", link);        articleData.put("user", user);        articleData.put("now", String.valueOf(now));        articleData.put("votes", "1");        conn.hmset(article, articleData);        conn.zadd("score:", now + VOTE_SCORE, article);        conn.zadd("time:", now, article);
        return articleId;    }
    public void articleVote(Jedis conn, String user, String article) {        long cutoff = (System.currentTimeMillis() / 1000) - ONE_WEEK_IN_SECONDS;        if (conn.zscore("time:", article) < cutoff){            return;        }
        String articleId = article.substring(article.indexOf(':') + 1);        if (conn.sadd("voted:" + articleId, user) == 1) {            conn.zincrby("score:", VOTE_SCORE, article);            conn.hincrBy(article, "votes", 1);        }    }

public List<Map<String,String>> getArticles(Jedis conn, int page) {        return getArticles(conn, page, "score:");    }
    public List<Map<String,String>> getArticles(Jedis conn, int page, String order) {         int start = (page - 1) * ARTICLES_PER_PAGE;        int end = start + ARTICLES_PER_PAGE - 1;
        Set<String> ids = conn.zrevrange(order, start, end);        List<Map<String,String>> articles = new ArrayList<Map<String,String>>();        for (String id : ids){            Map<String,String> articleData = conn.hgetAll(id);            articleData.put("id", id);            articles.add(articleData);        }
        return articles;    }
    public void addGroups(Jedis conn, String articleId, String[] toAdd) {        String article = "article:" + articleId;        for (String group : toAdd) {            conn.sadd("group:" + group, article);        }    }
    public List<Map<String,String>> getGroupArticles(Jedis conn, String group, int page) {        return getGroupArticles(conn, group, page, "score:");    }
    public List<Map<String,String>> getGroupArticles(Jedis conn, String group, int page, String order) {        String key = order + group;        if (!conn.exists(key)) {            ZParams params = new ZParams().aggregate(ZParams.Aggregate.MAX);            conn.zinterstore(key, params, "group:" + group, order);            conn.expire(key, 60);        }        return getArticles(conn, page, key);    }
    private void printArticles(List<Map<String,String>> articles){        for (Map<String,String> article : articles){            System.out.println("  id: " + article.get("id"));            for (Map.Entry<String,String> entry : article.entrySet()){                if (entry.getKey().equals("id")){                    continue;                }                System.out.println("    " + entry.getKey() + ": " + entry.getValue());            }        }    }}