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

   1 package pnews.servlet;
   2
   3 import java.io.IOException;
   4 import java.util.logging.Level;
   5 import java.util.logging.Logger;
   6
   7 import com.google.gson.Gson;
   8 import com.google.gson.JsonObject;
   9 import com.rometools.rome.io.FeedException;
  10
  11 import pnews.Article;
  12 import pnews.Category;
  13
  14 public class JSON {
  15         private static final Logger LOG = Logger.getLogger(JSON.class.getName());
  16
  17         public static String getStats(Category[] cats) {
  18                 JsonObject jstats, jreadcounts, jcategories, jmemory;
  19                 Runtime runtime;
  20                 Article[] articles;
  21
  22                 jstats = new JsonObject();
  23
  24                 jstats.addProperty("articles-count", ArticleStore.singleton.size());
  25
  26                 jreadcounts = new JsonObject();
  27                 jstats.add("read-counts", jreadcounts);
  28
  29                 articles = ArticleStore.singleton.getArticles();
  30                 for (Article a: articles)
  31                         if (a.readCount.get() > 0)
  32                                 jreadcounts.addProperty(a.link, a.readCount);
  33
  34                 jcategories = new JsonObject();
  35                 jstats.add("categories", jcategories);
  36
  37                 for (Category cat: cats)
  38                         try {
  39                                 jcategories.addProperty(cat.getName(),
  40                                                         articles.length);
  41                         } catch (IllegalArgumentException e) {
  42                                 LOG.log(Level.SEVERE, "Fail to retrieve articles", e);
  43                         }
  44
  45                 jmemory = new JsonObject();
  46                 jstats.add("memory", jmemory);
  47
  48                 runtime = Runtime.getRuntime();
  49                 jmemory.addProperty("total", runtime.totalMemory());
  50                 jmemory.addProperty("max", runtime.maxMemory());
  51                 jmemory.addProperty("free", runtime.freeMemory());
  52
  53                 return new Gson().toJson(jstats);
  54         }
  55 }