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[btree] use a block_ref_counter for internal nodes

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This commit is contained in:
Joe Thornber
2013-06-20 14:27:40 +01:00
parent e89d81e318
commit 83a09e1a2a
8 changed files with 88 additions and 27 deletions
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36
persistent-data/data-structures/btree.h
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@@ -31,6 +31,20 @@
//----------------------------------------------------------------
namespace persistent_data {
class block_ref_counter : public ref_counter<block_address> {
public:
block_ref_counter(space_map::ptr sm);
virtual void set(block_address const &v, uint32_t rc);
virtual void inc(block_address const &v);
virtual void dec(block_address const &v);
private:
space_map::ptr sm_;
};
// FIXME: move to sep file. I don't think it's directly used by
// the btree code.
struct uint64_traits {
typedef base::le64 disk_type;
typedef uint64_t value_type;
@@ -45,6 +59,20 @@ namespace persistent_data {
}
};
struct block_traits {
typedef base::le64 disk_type;
typedef block_address value_type;
typedef block_ref_counter ref_counter;
static void unpack(disk_type const &disk, value_type &value) {
value = base::to_cpu<uint64_t>(disk);
}
static void pack(value_type const &value, disk_type &disk) {
disk = base::to_disk<base::le64>(value);
}
};
namespace btree_detail {
using namespace base;
using namespace std;
@@ -243,11 +271,11 @@ namespace persistent_data {
return spine_.size() > 1;
}
node_ref<uint64_traits> get_parent() {
node_ref<block_traits> get_parent() {
if (spine_.size() < 2)
throw std::runtime_error("no parent");
return to_node<uint64_traits>(spine_.front());
return to_node<block_traits>(spine_.front());
}
block_address get_parent_location() const {
@@ -316,7 +344,7 @@ namespace persistent_data {
typedef typename block_manager<>::read_ref read_ref;
typedef typename block_manager<>::write_ref write_ref;
typedef typename btree_detail::node_ref<ValueTraits> leaf_node;
typedef typename btree_detail::node_ref<uint64_traits> internal_node;
typedef typename btree_detail::node_ref<block_traits> internal_node;
btree(typename persistent_data::transaction_manager::ptr tm,
typename ValueTraits::ref_counter rc);
@@ -420,7 +448,7 @@ namespace persistent_data {
typename persistent_data::transaction_manager::ptr tm_;
bool destroy_;
block_address root_;
no_op_ref_counter<uint64_t> internal_rc_;
block_ref_counter internal_rc_;
typename ValueTraits::ref_counter rc_;
typename block_manager<>::validator::ptr validator_;
};