// Logic: Checks every 10 seconds and clears full cache when
// anything changed in the DB. So it's as good as traffic-free
// when the DB is not changing.

!752

m {
  static int updateInterval = 10000;
  static long lastVersionCount;
  
  static new Map<S, S> md5s;
  
  p {
    startBot("Version Count Bot", "#1001745");
    makeBot("Snippet MD5 Bot.");
    updateLoop();
  }
  
  static void update() {
    new Matches m;
    if (match("version count: *", sendToLocalBot_cached("Version Count Bot", "get version count"), m)) {
      long count = parseLong(m.get(0));
      if (count != lastVersionCount) {
        lastVersionCount = count;
        clear();
      }
    }
  }
  
  static synchronized S answer(S s) {
    new Matches m;
    if (match3("what is the md5 of snippet *", s, m)) {
      S snippetID = formatSnippetID(m.unq(0));
      S md5 = md5s.get(snippetID);
      if (md5 == null) {
        md5 = getSnippetMD5(snippetID);
        if (md5 == null) ret "null";
        md5s.put(snippetID, md5);
      }
      ret format("The md5 of snippet * is *.", snippetID, md5);
    }
    
    if (match3("clear snippet md5 cache", s, m)) {
      clear();
      ret "OK.";
    }
    
    if (match3("get snippet md5 cache size", s, m)) {
      ret "Cache entries: " + md5s.size();
    }
    
    ret null;
  }
  
  static synchronized void clear() {
    md5s.clear();
  }
}

Began life as a copy of #1001747