MemoryBackend (size_t keyBytes, Parameters const& keyValues,
Scheduler& scheduler, beast::Journal journal)
: name_ (keyValues ["path"].toStdString ())
, journal_ (journal)
{
if (name_.empty())
throw std::runtime_error ("Missing path in Memory backend");
db_ = &memoryFactory.open(name_);
}
MemoryBackend (size_t keyBytes, Section const& keyValues,
Scheduler& scheduler, beast::Journal journal)
: name_ (get<std::string>(keyValues, "path"))
, journal_ (journal)
{
if (name_.empty())
throw std::runtime_error ("Missing path in Memory backend");
db_ = &memoryFactory.open(name_);
}
namespace NodeStore {
struct MemoryDB
{
std::mutex mutex;
bool open = false;
std::map <uint256 const, NodeObject::Ptr> table;
};
class MemoryFactory : public Factory
{
private:
std::mutex mutex_;
std::map <std::string, MemoryDB, beast::ci_less> map_;
public:
MemoryFactory();
~MemoryFactory();
std::string
getName() const;
std::unique_ptr <Backend>
createInstance (
size_t keyBytes,
Parameters const& keyValues,
Scheduler& scheduler,
beast::Journal journal);
MemoryDB&
open (std::string const& path)
{
std::lock_guard<std::mutex> _(mutex_);
auto const result = map_.emplace (std::piecewise_construct,
std::make_tuple(path), std::make_tuple());
MemoryDB& db = result.first->second;
if (db.open)
throw std::runtime_error("already open");
return db;
}
};
static MemoryFactory memoryFactory;
//------------------------------------------------------------------------------
class MemoryBackend : public Backend
{
private:
using Map = std::map <uint256 const, NodeObject::Ptr>;
std::string name_;
beast::Journal journal_;
MemoryDB* db_;
public:
MemoryBackend (size_t keyBytes, Parameters const& keyValues,
Scheduler& scheduler, beast::Journal journal)
: name_ (keyValues ["path"].toStdString ())
, journal_ (journal)
{
if (name_.empty())
throw std::runtime_error ("Missing path in Memory backend");
db_ = &memoryFactory.open(name_);
}
~MemoryBackend ()
{
close();
}
std::string
getName ()
{
return name_;
}
void
close() override
{
db_ = nullptr;
}
//--------------------------------------------------------------------------
Status
fetch (void const* key, NodeObject::Ptr* pObject)
{
uint256 const hash (uint256::fromVoid (key));
std::lock_guard<std::mutex> _(db_->mutex);
Map::iterator iter = db_->table.find (hash);
if (iter == db_->table.end())
{
pObject->reset();
return notFound;
}
*pObject = iter->second;
return ok;
}
void
store (NodeObject::ref object)
{
std::lock_guard<std::mutex> _(db_->mutex);
db_->table.emplace (object->getHash(), object);
}
void
storeBatch (Batch const& batch)
{
for (auto const& e : batch)
store (e);
}
void
for_each (std::function <void(NodeObject::Ptr)> f)
{
for (auto const& e : db_->table)
f (e.second);
}
int
getWriteLoad()
{
return 0;
}
void
setDeletePath() override
{
}
void
verify() override
{
}
};
//------------------------------------------------------------------------------
MemoryFactory::MemoryFactory()
{
Manager::instance().insert(*this);
}
MemoryFactory::~MemoryFactory()
{
Manager::instance().erase(*this);
}
std::string
MemoryFactory::getName() const
{
return "Memory";
}
std::unique_ptr <Backend>
MemoryFactory::createInstance (
size_t keyBytes,
Parameters const& keyValues,
Scheduler& scheduler,
beast::Journal journal)
{
return std::make_unique <MemoryBackend> (
keyBytes, keyValues, scheduler, journal);
}
}
