replicated_columns_view_factory.h

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#ifndef CS_REPLICATED_COLUMNS_VIEW_UTILS_H
#define CS_REPLICATED_COLUMNS_VIEW_UTILS_H
 
#include "sql/changestreams/misc/replicated_columns_view.h"  // ReplicatedColumnsView
#include "sql/changestreams/misc/replicated_columns_view_with_gipk_on_source.h"
#include "sql/rpl_utility.h"  // tabledef
#include "sql/sql_gipk.h"     // table_has_generated_invisible_primary_key
 
namespace cs {
namespace util {
 
/**
  @brief This class allows the creation of different types of column view
  instances and also adds different filters depending on context.
*/
class ReplicatedColumnsViewFactory {
 public:
  /**
    This function returns the appropriate class to iterate over the given
    table columns. It also adds inbound filtering
 
    It might return a standard column view/iteration class or one that
    accounts for GIPK or other differences
 
    @param thd The thread object to extract context information
    @param table The table where the column view will be created
    @param tabledef Context on the replicated table
 
    @return A unique pointer to a ReplicatedColumnsView object instance
   */
  static std::unique_ptr<ReplicatedColumnsView>
  get_columns_view_with_inbound_filters(THD *thd, TABLE *table,
                                        table_def const *tabledef) {
    std::unique_ptr<ReplicatedColumnsView> column_view;
 
    bool source_has_gipk =
        tabledef && tabledef->is_gipk_present_on_source_table();
    bool replica_has_gipk =
        table && table_has_generated_invisible_primary_key(table);
 
    if (!replica_has_gipk && source_has_gipk)
      column_view = std::unique_ptr<cs::util::ReplicatedColumnsView>{
          new cs::util::ReplicatedColumnsViewWithGipkOnSource{table, thd}};
    else
      column_view = std::unique_ptr<cs::util::ReplicatedColumnsView>{
          new cs::util::ReplicatedColumnsView{table, thd}};
 
    column_view->add_filter_if_needed(
        *thd, table, tabledef,
        cs::util::ColumnFilterFactory::ColumnFilterType::inbound_func_index);
    column_view->add_filter_if_needed(
        *thd, table, tabledef,
        cs::util::ColumnFilterFactory::ColumnFilterType::inbound_gipk);
 
    return column_view;
  }
 
  /**
    This function returns the appropriate class to iterate over the given
    table columns. It also adds outbound filtering
 
    @param thd The thread object to extract context information
    @param table The table where the column view will be created
 
    @return A unique pointer to a ReplicatedColumnsView object instance
  */
  static std::unique_ptr<ReplicatedColumnsView>
  get_columns_view_with_outbound_filters(THD *thd, TABLE *table) {
    auto column_view = std::unique_ptr<cs::util::ReplicatedColumnsView>{
        new cs::util::ReplicatedColumnsView{table, thd}};
 
    column_view->add_filter_if_needed(
        *thd, table, nullptr,
        cs::util::ColumnFilterFactory::ColumnFilterType::outbound_func_index);
 
    return column_view;
  }
};
}  // namespace util
}  // namespace cs
#endif  // CS_REPLICATED_COLUMNS_VIEW_UTILS_H