--- parser3/src/include/pa_sql_driver_manager.h	2001/05/17 10:12:28	1.4
+++ parser3/src/include/pa_sql_driver_manager.h	2001/09/14 15:41:59	1.9
@@ -5,7 +5,7 @@
 
 	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
 
-	$Id: pa_sql_driver_manager.h,v 1.4 2001/05/17 10:12:28 parser Exp $
+	$Id: pa_sql_driver_manager.h,v 1.9 2001/09/14 15:41:59 parser Exp $
 
 
 	global sql driver manager, must be thread-safe
@@ -22,16 +22,29 @@
 #include "pa_table.h"
 #include "pa_string.h"
 
+
+// defines
+
+#define MAIN_SQL_NAME "SQL"
+#define MAIN_SQL_DRIVERS_NAME "drivers"
+
+// forwards
+
 class SQL_Connection;
 
-/// sql driver manager
+/**	sql driver manager
+		maintains 
+		- driver cache  which never expires
+		- connection cache  unused connections got expired
+*/
 class SQL_Driver_manager : public Pooled {
 	friend SQL_Connection;
 public:
 
 	SQL_Driver_manager(Pool& pool) : Pooled(pool),
 		driver_cache(pool),
-		connection_cache(pool) {
+		connection_cache(pool),
+		prev_expiration_pass_time(0) {
 	}
 
 	/** 
@@ -50,6 +63,9 @@ private: // connection cache
 
 	SQL_Connection *get_connection_from_cache(const String& url);
 	void put_connection_to_cache(const String& url, SQL_Connection& connection);
+	void maybe_expire_connection_cache();
+private:
+	time_t prev_expiration_pass_time;
 
 private: // for SQL_Connection