war/src/main/java/pnews/servlet/JSON.java

   1 package pnews.servlet;
   2
   3 import java.util.logging.Level;
   4 import java.util.logging.Logger;
   5
   6 import com.google.gson.Gson;
   7 import com.google.gson.JsonObject;
   8
   9 import pnews.Article;
  10 import pnews.Category;
  11
  12 public class JSON {
  13         private static final Logger LOG = Logger.getLogger(JSON.class.getName());
  14
  15         public static String getStats(Category[] cats) {
  16                 JsonObject jstats, jreadcounts, jcategories, jmemory;
  17                 Runtime runtime;
  18                 Article[] articles;
  19
  20                 jstats = new JsonObject();
  21
  22                 jstats.addProperty("articles-count", ArticleStore.singleton.size());
  23
  24                 jreadcounts = new JsonObject();
  25                 jstats.add("read-counts", jreadcounts);
  26
  27                 articles = ArticleStore.singleton.getArticles();
  28                 for (Article a: articles)
  29                         if (a.readCount.get() > 0)
  30                                 jreadcounts.addProperty(a.link, a.readCount);
  31
  32                 jcategories = new JsonObject();
  33                 jstats.add("categories", jcategories);
  34
  35                 for (Category cat: cats)
  36                         try {
  37                                 jcategories.addProperty(cat.getLabel(),
  38                                                         articles.length);
  39                         } catch (IllegalArgumentException e) {
  40                                 LOG.log(Level.SEVERE, "Fail to retrieve articles", e);
  41                         }
  42
  43                 jmemory = new JsonObject();
  44                 jstats.add("memory", jmemory);
  45
  46                 runtime = Runtime.getRuntime();
  47                 jmemory.addProperty("total", runtime.totalMemory());
  48                 jmemory.addProperty("max", runtime.maxMemory());
  49                 jmemory.addProperty("free", runtime.freeMemory());
  50
  51                 return new Gson().toJson(jstats);
  52         }
  53 }