[era] switch from bloom filters to writesets

era/writeset_tree.h

@@ -0,0 +1,87 @@
+#ifndef ERA_WRITESET_TREE_H
+#define ERA_WRITESET_TREE_H
+
+#include "era/era_detail.h"
+#include "persistent-data/data-structures/btree.h"
+
+//----------------------------------------------------------------
+
+namespace era {
+	namespace writeset_tree_detail {
+		class damage_visitor;
+
+		class damage {
+		public:
+			damage(std::string const &desc)
+				: desc_(desc) {
+			}
+
+			virtual ~damage() {}
+			virtual void visit(damage_visitor &v) const = 0;
+
+			std::string const &get_desc() const {
+				return desc_;
+			}
+
+		private:
+			std::string desc_;
+		};
+
+		struct missing_eras : public damage {
+			missing_eras(std::string const &desc, run<uint32_t> const &eras);
+			virtual void visit(damage_visitor &v) const;
+
+			run<uint32_t> eras_;
+		};
+
+		struct damaged_writeset : public damage {
+			damaged_writeset(std::string const &desc,
+					 uint32_t era,
+					 run<uint32_t> missing_bits);
+			virtual void visit(damage_visitor &v) const;
+
+			uint32_t era_;
+			run<uint32_t> missing_bits_;
+		};
+
+		class damage_visitor {
+		public:
+			typedef boost::shared_ptr<damage_visitor> ptr;
+
+			virtual ~damage_visitor() {}
+
+			void visit(damage const &d) {
+				d.visit(*this);
+			}
+
+			virtual void visit(missing_eras const &d) = 0;
+			virtual void visit(damaged_writeset const &d) = 0;
+		};
+
+		class writeset_visitor {
+		public:
+			typedef boost::shared_ptr<writeset_visitor> ptr;
+
+			virtual ~writeset_visitor() {}
+
+			virtual void writeset_begin(uint32_t era, uint32_t nr_bits) = 0;
+			virtual void bit(uint32_t index, bool value) = 0;
+			virtual void writeset_end() = 0;
+		};
+	}
+
+	typedef persistent_data::btree<1, era_detail_traits> writeset_tree;
+
+	void walk_writeset_tree(persistent_data::transaction_manager::ptr tm,
+				writeset_tree const &tree,
+				writeset_tree_detail::writeset_visitor &writeset_v,
+				writeset_tree_detail::damage_visitor &dv);
+
+	void check_writeset_tree(persistent_data::transaction_manager::ptr tm,
+				 writeset_tree const &tree,
+				 writeset_tree_detail::damage_visitor &dv);
+}
+
+//----------------------------------------------------------------
+
+#endif