Separate Index class to track streams via intrusive list

stream.h

@@ -6,30 +6,31 @@
 
 namespace firesse {
 
+class Index;
+
 class Stream {
   public:
-	Stream(firecgi::Request* request);
+	Stream(firecgi::Request* request, Index* index);
+	~Stream();
 
 	void OnClose(const std::function<void()>& callback);
 
 	bool WriteEvent(const std::string& data, uint64_t id=0, const std::string& type="");
 	bool End();
-
-	std::chrono::steady_clock::time_point LastMessageTime();
 	void Close();
 
   private:
 	firecgi::Request* request_;
+	Index* index_;
 
 	std::function<void()> on_close_;
 
 	std::mutex mu_;
 	std::chrono::steady_clock::time_point last_message_time_;
-};
+	Stream* fresher_;
+	Stream* staler_;
 
-class IsFresherStream {
-  public:
-	bool operator() (Stream* a, Stream* b) const;
+	friend class Index;
 };
 
 } // namespace firesse