Abstract all row event processing

The code that handles the Avro files is now fully abstracted behind the
AvroConverter class that implements the RowEventHandler interface.

The code still has some avro specific behavior in a few places (parsing of
JSON files into TableCreate objects). This can be replaced, if needed, by
querying the master server for the CREATE TABLE statements.

server/modules/routing/avrorouter/rpl_events.hh

@@ -15,6 +15,10 @@
 #include <vector>
 #include <cstdint>
 #include <string>
+#include <tr1/memory>
+#include <tr1/unordered_map>
+
+#include <binlog_common.h>
 
 typedef std::vector<uint8_t> Bytes;
 
@@ -113,21 +117,32 @@ typedef std::tr1::shared_ptr<TableMapEvent>    STableMapEvent;
 class RowEventHandler
 {
 public:
-    RowEventHandler(const STableMapEvent& map, const STableCreateEvent& create):
-        m_map(map),
-        m_create(create)
-    {
-    }
-
     virtual ~RowEventHandler()
     {
     }
 
+    // A table was opened
+    virtual bool open_table(const STableMapEvent& map, const STableCreateEvent& create)
+    {
+        return true;
+    }
+
     // Prepare a new row for processing
-    virtual void prepare(const gtid_pos_t& gtid, const REP_HEADER& hdr, int event_type) = 0;
+    virtual bool prepare_table(std::string database, std::string table)
+    {
+        return true;
+    }
+
+    // Flush open tables
+    virtual void flush_tables()
+    {
+    }
+
+    // Prepare a new row for processing
+    virtual void prepare_row(const gtid_pos_t& gtid, const REP_HEADER& hdr, int event_type) = 0;
 
     // Called once all columns are processed
-    virtual bool commit() = 0;
+    virtual bool commit(const gtid_pos_t& gtid) = 0;
 
     // 32-bit integer handler
     virtual void column(int i, int32_t value) = 0;
@@ -149,8 +164,4 @@ public:
 
     // Empty (NULL) value type handler
     virtual void column(int i) = 0;
-
-protected:
-    const STableMapEvent&    m_map; // The table map event for this row
-    const STableCreateEvent& m_create; // The CREATE TABLE statement for this row
 };