WL#3337 (Event scheduler new architecture)

This is the first cut of separating Event_scheduler in two
classes which are more specialized.
Inheritance was used to separate methods and member variables.
Still Event_scheduler is a child of Event_queue. This dependency
will be removed soon.


sql/event_data_objects.cc:
  add comments
sql/event_db_repository.cc:
  coding style
sql/event_db_repository.h:
  add a call, will be implemented later
sql/event_queue.cc:
  Event_queue, still as super-class of Event_scheduler
sql/event_queue.h:
  Event_queue as super-class of Event_scheduler. Trying to
  separate the two classes
sql/event_scheduler.cc:
  Event_scheduler as child class of Event_queue.
  Trying to separate both classes.
sql/event_scheduler.h:
  Event_scheduler as child class of Event_queue.
  Trying to separate both classes.
sql/events.cc:
  Don't allocate on the stack the scheduler but on the heap.
  The exact way it is done will be changed, that's ok for now.

1 files changed, 20 insertions, 0 deletions

diff --git a/sql/event_data_objects.cc b/sql/event_data_objects.cc
index a47a3e9e936..f4147d72c3d 100644
--- a/sql/event_data_objects.cc
+++ b/sql/event_data_objects.cc
@@ -25,6 +25,19 @@
 #define EVEX_MAX_INTERVAL_VALUE 2147483647L
 
 
+/*
+  Returns a new instance
+
+  SYNOPSIS
+    Event_parse_data::new_instance()
+
+  RETURN VALUE
+    Address or NULL in case of error
+  
+  NOTE
+    Created on THD's mem_root
+*/
+
 Event_parse_data *
 Event_parse_data::new_instance(THD *thd)
 {
@@ -32,6 +45,13 @@ Event_parse_data::new_instance(THD *thd)
 }
 
 
+/*
+  Constructor
+
+  SYNOPSIS
+    Event_parse_data::Event_parse_data()
+*/
+
 Event_parse_data::Event_parse_data()
 {
   item_execute_at= item_expression= item_starts= item_ends= NULL;