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blockchain/src/common/db_abstract_accessor.h

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// Copyright (c) 2014-2019 Zano Project
// Copyright (c) 2014-2018 The Louisdor Project
// Copyright (c) 2012-2013 The Boolberry developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#pragma once
#include <unordered_map>
#include <set>
#include <atomic>
#include "include_base_utils.h"
#include "db_backend_base.h"
#include "misc_language.h"
#include "cache_helper.h"
#include "profile_tools.h"
#include "../serialization/serialization.h"
#include "readwrite_lock.h"
#include "math_helper.h"
#undef LOG_DEFAULT_CHANNEL
#define LOG_DEFAULT_CHANNEL "db"
// 'db' channel is disabled by default
namespace tools
{
namespace db
{
template<class t_pod_key>
const char* key_to_ptr(const t_pod_key& k, size_t& s)
{
static_assert(std::is_pod<t_pod_key>::value, "t_pod_key must be a POD type.");
s = sizeof(k);
return reinterpret_cast<const char*>(&k);
}
inline
const char* key_to_ptr(const std::string& k, size_t& s)
{
s = k.size();
return k.data();
}
template<class t_pod_key>
void key_from_ptr(t_pod_key& k, const void* pkey, uint64_t ks)
{
static_assert(std::is_pod<t_pod_key>::value, "t_pod_key must be a POD type.");
CHECK_AND_ASSERT_THROW_MES(sizeof(t_pod_key) == ks, "size missmatch");
CHECK_AND_ASSERT_THROW_MES(pkey, "wrog ptr(null)");
k = *(t_pod_key*)pkey;
}
inline
void key_from_ptr(std::string& k, const void* pkey, uint64_t ks)
{
CHECK_AND_ASSERT_THROW_MES(pkey, "wrog ptr(null)");
k.assign((const char*)pkey, static_cast<size_t>(ks));
}
struct i_db_parent_to_container_callabck
{
virtual bool on_write_transaction_begin(){ return true; }
virtual bool on_write_transaction_commit(){ return true; }
virtual bool on_write_transaction_abort(){ return true; }
};
/************************************************************************/
/* */
/************************************************************************/
class basic_db_accessor
{
std::shared_ptr<i_db_backend> m_backend;
epee::critical_section m_binded_containers_lock;
std::set<i_db_parent_to_container_callabck*> m_binded_containers;
epee::critical_section m_transactions_stack_lock;
std::map<std::thread::id, std::vector<bool> > m_transactions_stack;
std::atomic<bool> m_is_open;
epee::shared_recursive_mutex& m_rwlock;
public:
struct performance_data
{
epee::math_helper::average<uint64_t, 10> backend_set_pod_time;
epee::math_helper::average<uint64_t, 10> backend_set_t_time;
epee::math_helper::average<uint64_t, 10> set_serialize_t_time;
epee::math_helper::average<uint64_t, 10> backend_get_pod_time;
epee::math_helper::average<uint64_t, 10> backend_get_t_time;
epee::math_helper::average<uint64_t, 10> get_serialize_t_time;
};
private:
mutable performance_data m_gperformance_data;
mutable std::unordered_map<container_handle, performance_data> m_performance_data_map;
public:
basic_db_accessor(std::shared_ptr<i_db_backend> backend, epee::shared_recursive_mutex& rwlock) :m_backend(backend), m_rwlock(rwlock), m_is_open(false)
{}
~basic_db_accessor()
{
close();
}
performance_data& get_performance_data_for_handle(container_handle h) const { return m_performance_data_map[h]; }
performance_data& get_performance_data_global() const { return m_gperformance_data; }
bool bind_parent_container(i_db_parent_to_container_callabck* pcontainer)
{
CRITICAL_REGION_LOCAL(m_binded_containers_lock);
m_binded_containers.insert(pcontainer);
return true;
}
bool unbind_parent_container(i_db_parent_to_container_callabck* pcontainer)
{
CRITICAL_REGION_LOCAL(m_binded_containers_lock);
auto it = m_binded_containers.find(pcontainer);
CHECK_AND_ASSERT_THROW_MES(it != m_binded_containers.end(), "Unable to unbind pointer");
m_binded_containers.erase(it);
return true;
}
bool has_writer_tx_in_stack(const std::vector<bool>& ve)
{
for (auto v : ve)
{
if (!v)
return true;
}
return false;
}
bool begin_transaction(bool readonly = false)
{
bool r = m_backend->begin_transaction(readonly);
CRITICAL_REGION_LOCAL(m_transactions_stack_lock);
std::vector<bool>& this_thread_tx_stack = m_transactions_stack[std::this_thread::get_id()];
if (r)
{
bool need_to_brodcst_writer_tx = !has_writer_tx_in_stack(this_thread_tx_stack);
this_thread_tx_stack.push_back(readonly);
if (need_to_brodcst_writer_tx && !readonly)
{
LOG_PRINT_CYAN("[WRITE_TX_BEGIN]", LOG_LEVEL_2);
for (auto cnt_ptr : m_binded_containers)
{
cnt_ptr->on_write_transaction_begin();
}
}
}
return r;
}
bool begin_readonly_transaction()const
{
return const_cast<basic_db_accessor&>(*this).begin_transaction(true);
}
void commit_transaction()const
{
return const_cast<basic_db_accessor&>(*this).commit_transaction();
}
void commit_transaction()
{
bool r = false;
bool is_writer_tx = false;
{
CRITICAL_REGION_LOCAL(m_transactions_stack_lock);
std::vector<bool>& this_thread_tx_stack = m_transactions_stack[std::this_thread::get_id()];
CHECK_AND_ASSERT_THROW_MES(this_thread_tx_stack.size(), "Internal error: this_thread_tx_stack.size = 0 at commit tx");
is_writer_tx = !this_thread_tx_stack.back();
}
if (is_writer_tx)
m_rwlock.lock(); // wait all readers and writers to get exclusive access
{
CRITICAL_REGION_LOCAL(m_transactions_stack_lock);
r = m_backend->commit_transaction(); //commit first and then switch cache isolation off (via on_write_transaction_commit() below)
std::vector<bool>& this_thread_tx_stack = m_transactions_stack[std::this_thread::get_id()];
CHECK_AND_ASSERT_THROW_MES(this_thread_tx_stack.size(), "Internal error: this_thread_tx_stack.size = 0 at commit tx");
CHECK_AND_ASSERT_THROW_MES(!this_thread_tx_stack.back() == is_writer_tx, "Internal error: !this_thread_tx_stack.back() != is_writer_tx at commit tx");
this_thread_tx_stack.pop_back();
bool has_other_writers_on_stack = has_writer_tx_in_stack(this_thread_tx_stack);
if (is_writer_tx && !has_other_writers_on_stack)
{
LOG_PRINT_CYAN("[WRITE_TX_COMMIT]", LOG_LEVEL_2);
for (auto cnt_ptr : m_binded_containers)
{
cnt_ptr->on_write_transaction_commit(); // will cause cache isolation to be switched off
}
}
}
if (is_writer_tx)
m_rwlock.unlock();//manual unlock
CHECK_AND_ASSERT_THROW_MES(r, "failed to commit tx");
}
void abort_transaction()
{
bool is_writer_tx = false;
{
CRITICAL_REGION_LOCAL(m_transactions_stack_lock);
std::vector<bool>& this_thread_tx_stack = m_transactions_stack[std::this_thread::get_id()];
CHECK_AND_ASSERT_THROW_MES(this_thread_tx_stack.size(), "Internal error: this_thread_tx_stack.size = 0 at abort tx");
CHECK_AND_ASSERT_THROW_MES(!this_thread_tx_stack.back(), "Internal error: abort on readonly tx");
is_writer_tx = !this_thread_tx_stack.back();
}
if (is_writer_tx)
m_rwlock.lock(); // wait all readers and writers to get exclusive access
{
CRITICAL_REGION_LOCAL(m_transactions_stack_lock);
m_backend->abort_transaction(); // abort first and then switch cache isolation off (via on_write_transaction_abort() below)
std::vector<bool>& this_thread_tx_stack = m_transactions_stack[std::this_thread::get_id()];
CHECK_AND_ASSERT_THROW_MES(this_thread_tx_stack.size(), "Internal error: this_thread_tx_stack.size = 0 at abort tx");
CHECK_AND_ASSERT_THROW_MES(!this_thread_tx_stack.back(), "Internal error: abort on readonly tx");
this_thread_tx_stack.pop_back();
bool has_other_writers_on_stack = has_writer_tx_in_stack(this_thread_tx_stack);
if (!has_other_writers_on_stack)
{
LOG_PRINT_CYAN("[WRITE_TX_ABORT]", LOG_LEVEL_2);
for (auto cnt_ptr : m_binded_containers)
{
cnt_ptr->on_write_transaction_abort(); // will cause cache isolation to be switched off
}
}
}
if (is_writer_tx)
m_rwlock.unlock();//manual unlock
}
std::shared_ptr<i_db_backend> get_backend() const
{
return m_backend;
}
bool close()
{
m_is_open = false;
return m_backend->close();
}
bool open(const std::string& path, uint64_t flags = 0)
{
bool r = m_backend->open(path, flags);
if(r)
m_is_open = true;
return r;
}
bool is_open()
{
return m_is_open;
}
uint64_t size(container_handle h) const
{
return m_backend->size(h);
}
template<class t_pod_key>
bool erase(container_handle h, const t_pod_key& k)
{
//TRY_ENTRY();
size_t sk = 0;
const char* pk = key_to_ptr(k, sk);
return m_backend->erase(h, pk, sk);
//CATCH_ENTRY_L0("get_t_object_from_db", false);
}
template<class t_pod_key, class t_object>
bool get_t_object(container_handle h, const t_pod_key& k, t_object& obj) const
{
performance_data& m_performance_data = m_gperformance_data;
//TRY_ENTRY();
std::string res_buff;
size_t sk = 0;
const char* pk = key_to_ptr(k, sk);
TIME_MEASURE_START_PD(backend_get_t_time);
if (!m_backend->get(h, pk, sk, res_buff))
return false;
TIME_MEASURE_FINISH_PD(backend_get_t_time);
TIME_MEASURE_START_PD(get_serialize_t_time);
bool res = t_unserializable_object_from_blob(obj, res_buff);
TIME_MEASURE_FINISH_PD(get_serialize_t_time);
return res;
//CATCH_ENTRY_L0("get_t_object_from_db", false);
}
bool clear(container_handle h)
{
return m_backend->clear(h);
}
template<class t_pod_key, class t_object>
bool set_t_object(container_handle h, const t_pod_key& k, t_object& obj)
{
performance_data& m_performance_data = m_performance_data_map[h];
//TRY_ENTRY();
std::string obj_buff;
TIME_MEASURE_START_PD(set_serialize_t_time);
::t_serializable_object_to_blob(obj, obj_buff);
TIME_MEASURE_FINISH_PD(set_serialize_t_time);
size_t sk = 0;
const char* pk = key_to_ptr(k, sk);
TIME_MEASURE_START_PD(backend_set_t_time);
bool r = m_backend->set(h, pk, sk, obj_buff.data(), obj_buff.size());
TIME_MEASURE_FINISH_PD(backend_set_t_time);
return r;
//CATCH_ENTRY_L0("set_t_object_to_db", false);
}
template<class t_pod_key, class t_pod_object>
bool get_pod_object(container_handle h, const t_pod_key& k, t_pod_object& obj) const
{
static_assert(std::is_pod<t_pod_object>::value, "t_pod_object must be a POD type.");
performance_data& m_performance_data = m_gperformance_data;
//TRY_ENTRY();
std::string res_buff;
size_t sk = 0;
const char* pk = key_to_ptr(k, sk);
TIME_MEASURE_START_PD(backend_get_pod_time);
if (!m_backend->get(h, pk, sk, res_buff))
return false;
TIME_MEASURE_FINISH_PD(backend_get_pod_time);
CHECK_AND_ASSERT_MES(sizeof(t_pod_object) == res_buff.size(), false, "sizes missmath at get_pod_object_from_db(). returned size = "
<< res_buff.size() << "expected: " << sizeof(t_pod_object));
obj = *(t_pod_object*)res_buff.data();
return true;
//CATCH_ENTRY_L0("get_t_object_from_db", false);
}
template<class t_pod_key, class t_pod_object>
bool set_pod_object(container_handle h, const t_pod_key& k, const t_pod_object& obj)
{
performance_data& m_performance_data = m_performance_data_map[h];
static_assert(std::is_pod<t_pod_object>::value, "t_pod_object must be a POD type.");
size_t sk = 0;
const char* pk = key_to_ptr(k, sk);
TIME_MEASURE_START_PD(backend_set_pod_time);
bool r = m_backend->set(h, pk, sk, (const char*)&obj, sizeof(obj));
TIME_MEASURE_FINISH_PD(backend_set_pod_time);
if (!r)
return false;
return true;
//CATCH_ENTRY_L0("get_t_object_from_db", false);
}
};
/************************************************************************/
/* */
/************************************************************************/
class key_value_pod_access_strategy
{
public:
template<class t_value>
static bool from_buff_to_obj(const void* pv, uint64_t vs, t_value& v)
{
CHECK_AND_ASSERT_THROW_MES(sizeof(t_value) == vs, "sizes missmath at get_pod_object_from_db(). returned size = "
<< vs << "expected: " << sizeof(t_value));
v = *(t_value*)pv;
return true;
}
template<class t_key, class t_value>
static void set(container_handle h, basic_db_accessor& bdb, const t_key& k, const t_value& v)
{
static_assert(std::is_pod<t_value>::value, "t_value must be a POD type.");
bdb.set_pod_object(h, k, v);
}
template<class t_key, class t_value>
static std::shared_ptr<const t_value> get(container_handle h, basic_db_accessor& bdb, const t_key& k)
{
static_assert(std::is_pod<t_value>::value, "t_value must be a POD type.");
std::shared_ptr<const t_value> res(nullptr);
t_value v = AUTO_VAL_INIT(v);
if (bdb.get_pod_object(h, k, v))
{
//TODO: remove one extra copy
res.reset(new t_value(v));
}
return res;
}
};
/************************************************************************/
/* */
/************************************************************************/
class key_value_t_access_strategy
{
public:
template<class t_value>
static bool from_buff_to_obj(const void* pv, uint64_t vs, t_value& v)
{
std::string src_blob((const char*)pv, static_cast<size_t>(vs));
return t_unserializable_object_from_blob(v, src_blob);//::t_serializable_object_to_blob(v, res_buff);
}
template<class t_key, class t_value>
static void set(container_handle h, basic_db_accessor& bdb, const t_key& k, const t_value& v)
{
bdb.set_t_object(h, k, v);
}
template<class t_key, class t_value>
static std::shared_ptr<const t_value> get(container_handle h, basic_db_accessor& bdb, const t_key& k)
{
std::shared_ptr<const t_value> res(nullptr);
t_value v = AUTO_VAL_INIT(v);
if (bdb.get_t_object(h, k, v))
{
//TODO: remove one extra copy
res.reset(new t_value(v));
}
return res;
}
};
/****************************************************************************************/
/* to make easier selecting of strategy by true/false instead of long type definition */
/****************************************************************************************/
template<bool is_t_strategy>
class access_strategy_selector;
template<>
class access_strategy_selector<true>: public key_value_t_access_strategy
{};
template<>
class access_strategy_selector<false>: public key_value_pod_access_strategy
{};
/************************************************************************/
/* */
/************************************************************************/
template<class t_cb, class t_key>
struct keys_accessor_cb : i_db_callback
{
t_cb m_cb;
keys_accessor_cb(t_cb cb) :m_cb(cb){}
bool on_enum_item(uint64_t i, const void* pkey, uint64_t ks, const void* pval, uint64_t vs)
{
t_key k = AUTO_VAL_INIT(k);
key_from_ptr(k, pkey, ks);
return m_cb(i, k);
}
};
template<class t_cb, class t_key, class t_value, class t_value_read_strategy>
struct items_accessor_cb : i_db_callback
{
t_cb m_cb;
items_accessor_cb(t_cb cb) :m_cb(cb){}
bool on_enum_item(uint64_t i, const void* pkey, uint64_t ks, const void* pval, uint64_t vs)
{
t_key k = AUTO_VAL_INIT(k);
t_value v = AUTO_VAL_INIT(v);
key_from_ptr(k, pkey, ks);
t_value_read_strategy::from_buff_to_obj(pval, vs, v);
return m_cb(i, k, v);
}
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_key, class t_value, bool is_t_access_strategy>
class basic_key_value_accessor : public i_db_parent_to_container_callabck
{
#ifdef ENABLE_PROFILING
mutable epee::profile_tools::local_call_account m_get_profiler;
mutable epee::profile_tools::local_call_account m_set_profiler;
mutable epee::profile_tools::local_call_account m_explicit_get_profiler;
mutable epee::profile_tools::local_call_account m_explicit_set_profiler;
mutable epee::profile_tools::local_call_account m_commit_profiler;
#endif
mutable uint64_t size_cache;
mutable bool size_cache_valid;
protected:
container_handle m_h;
basic_db_accessor& bdb;
epee::misc_utils::isolation_lock m_isolation;
public:
typedef t_value t_value_type;
basic_key_value_accessor(basic_db_accessor& db) :
bdb(db),
m_h(AUTO_VAL_INIT(m_h)),
size_cache(0),
size_cache_valid(false)
{
db.bind_parent_container(this);
}
~basic_key_value_accessor()
{
bdb.unbind_parent_container(this);
}
virtual bool on_write_transaction_begin()
{
m_isolation.set_isolation_mode();
return true;
}
virtual bool on_write_transaction_commit()
{
m_isolation.reset_isolation_mode();
return true;
}
virtual bool on_write_transaction_abort()
{
m_isolation.reset_isolation_mode();
return true;
}
bool begin_transaction(bool read_only = false)
{
return bdb.begin_transaction(read_only);
}
void commit_transaction()
{
try
{
PROFILE_FUNC_ACC(m_commit_profiler);
bdb.commit_transaction();
}
catch (...)
{
size_cache_valid = false;
throw;
}
}
void abort_transaction()
{
size_cache_valid = false;
bdb.abort_transaction();
}
bool init(const std::string& container_name)
{
#ifdef ENABLE_PROFILING
m_get_profiler.m_name = container_name +":get";
m_set_profiler.m_name = container_name + ":set";
m_explicit_get_profiler.m_name = container_name + ":explicit_get";
m_explicit_set_profiler.m_name = container_name + ":explicit_set";
m_commit_profiler.m_name = container_name + ":commit";
#endif
return bdb.get_backend()->open_container(container_name, m_h);
}
bool deinit()
{
#ifdef ENABLE_PROFILING
m_get_profiler.m_name = "";
m_set_profiler.m_name = "";
m_explicit_get_profiler.m_name = "";
m_explicit_set_profiler.m_name = "";
m_commit_profiler.m_name = "";
#endif
m_h = AUTO_VAL_INIT(m_h);
size_cache = 0;
size_cache_valid = false;
return true;
}
template<class t_cb>
void enumerate_keys(t_cb cb) const
{
keys_accessor_cb<t_cb, t_key> local_enum_handler(cb);
bdb.get_backend()->enumerate(m_h, &local_enum_handler);
}
template<class t_cb>
void enumerate_items(t_cb cb)const
{
items_accessor_cb<t_cb, t_key, t_value, access_strategy_selector<is_t_access_strategy> > local_enum_handler(cb);
bdb.get_backend()->enumerate(m_h, &local_enum_handler);
}
template<class t_explicit_key, class t_explicit_value, class t_strategy>
void explicit_set(const t_explicit_key& k, const t_explicit_value& v)
{
PROFILE_FUNC_ACC(m_explicit_set_profiler);
size_cache_valid = false;
t_strategy::set(m_h, bdb, k, v);
}
template<class t_explicit_key, class t_explicit_value, class t_strategy>
std::shared_ptr<const t_explicit_value> explicit_get(const t_explicit_key& k)
{
PROFILE_FUNC_ACC(m_explicit_get_profiler);
return t_strategy::template get<t_explicit_key, t_explicit_value>(m_h, bdb, k);
}
void set(const t_key& k, const t_value& v)
{
PROFILE_FUNC_ACC(m_set_profiler);
size_cache_valid = false;
access_strategy_selector<is_t_access_strategy>::set(m_h, bdb, k, v);
}
std::shared_ptr<const t_value> get(const t_key& k) const
{
PROFILE_FUNC_ACC(m_get_profiler);
return access_strategy_selector<is_t_access_strategy>::template get<t_key, t_value>(m_h, bdb, k);
}
//find() and end() aliases for make easier porting std stuff
std::shared_ptr<const t_value> find(const t_key& k) const
{
return get(k);
}
std::shared_ptr<const t_value> end() const
{
return std::shared_ptr<const t_value>(nullptr);
}
uint64_t size() const
{
return m_isolation.isolated_access<uint64_t>([&](bool allowed_cache)
{
if (allowed_cache && size_cache_valid)
{
return size_cache;
}
else
{
uint64_t res = bdb.size(m_h);
if (allowed_cache)
{
size_cache = res;
size_cache_valid = true;
}
return res;
}
});
}
uint64_t size_no_cache() const
{
return bdb.size(m_h);
}
size_t clear()
{
bdb.clear(m_h);
m_isolation.isolated_write_access<bool>([&](){
size_cache_valid = false;
return true;
});
return true;
}
bool erase_validate(const t_key& k)
{
auto res_ptr = this->get(k);
bdb.erase(m_h, k);
m_isolation.isolated_write_access<bool>([&](){
size_cache_valid = false;
return true;
});
return static_cast<bool>(res_ptr);
}
void erase(const t_key& k)
{
bdb.erase(m_h, k);
m_isolation.isolated_write_access<bool>([&](){
size_cache_valid = false;
return true;
});
}
std::shared_ptr<const t_value> operator[] (const t_key& k) const
{
auto r = this->get(k);
CHECK_AND_ASSERT_THROW(r.get(), std::out_of_range("Out of range in basic_key_value_accessor"));
return r;
}
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_key, class t_value, bool is_t_access_strategy, bool is_ordered_type>
class cached_key_value_accessor : public basic_key_value_accessor<t_key, t_value, is_t_access_strategy>
{
typedef basic_key_value_accessor<t_key, t_value, is_t_access_strategy> base_class;
typedef epee::misc_utils::cache_with_write_isolation<is_ordered_type, t_key, std::shared_ptr<const t_value>, 10000> cache_container_type;
//typedef epee::misc_utils::cache_dummy<is_ordered_type, t_key, std::shared_ptr<const t_value>, 100000> cache_container_type;
mutable cache_container_type m_cache;
virtual bool on_write_transaction_abort()
{
clear_cache();
return base_class::on_write_transaction_abort();
}
public:
struct performance_data
{
epee::math_helper::average<uint64_t, 1000> hit_percent;
epee::math_helper::average<uint64_t, 10> read_cache_microsec;
epee::math_helper::average<uint64_t, 10> read_db_microsec;
epee::math_helper::average<uint64_t, 10> update_cache_microsec;
epee::math_helper::average<uint64_t, 10> write_to_cache_microsec;
epee::math_helper::average<uint64_t, 10> write_to_db_microsec;
};
cached_key_value_accessor(basic_db_accessor& db) :
basic_key_value_accessor<t_key, t_value, is_t_access_strategy>(db),
m_cache(base_class::m_isolation)
{
}
~cached_key_value_accessor()
{
NESTED_TRY_ENTRY();
m_cache.clear(); //will clear cache isolated
NESTED_CATCH_ENTRY(__func__);
}
void clear_cache() const
{
m_cache.clear();
}
void set_cache_size(uint64_t max_cache_size)
{
m_cache.set_max_elements(max_cache_size);
}
void set(const t_key& k, const t_value& v)
{
TIME_MEASURE_START_PD(write_to_db_microsec);
base_class::set(k, v);
TIME_MEASURE_FINISH_PD(write_to_db_microsec);
TIME_MEASURE_START_PD(write_to_cache_microsec);
m_cache.set(k, std::shared_ptr<const t_value>(new t_value(v)));
TIME_MEASURE_FINISH_PD(write_to_cache_microsec);
}
std::shared_ptr<const t_value> get(const t_key& k) const
{
std::shared_ptr<const t_value> res;
TIME_MEASURE_START_PD(read_cache_microsec);
bool r = m_cache.get(k, res);
TIME_MEASURE_FINISH_PD(read_cache_microsec);
if (r)
{
m_performance_data.hit_percent.push(100);
return res;
}
m_performance_data.hit_percent.push(0);
TIME_MEASURE_START_PD(read_db_microsec);
res = base_class::get(k);
TIME_MEASURE_FINISH_PD(read_db_microsec);
if (res)
{
TIME_MEASURE_START_PD(update_cache_microsec);
m_cache.set(k, res);
TIME_MEASURE_FINISH_PD(update_cache_microsec);
}
return res;
}
size_t clear()
{
m_cache.clear();
return base_class::clear();
}
bool erase_validate(const t_key& k)
{
auto res_ptr = base_class::erase_validate(k);
m_cache.erase(k);
return static_cast<bool>(res_ptr);
}
std::shared_ptr<const t_value> operator[] (const t_key& k) const
{
return get(k);
}
void erase(const t_key& k)
{
base_class::erase(k);
m_cache.erase(k);
}
performance_data& get_performance_data() const
{
return m_performance_data;
}
typename basic_db_accessor::performance_data& get_performance_data_native() const
{
return base_class::bdb.get_performance_data_for_handle(base_class::m_h);
}
typename basic_db_accessor::performance_data& get_performance_data_global() const
{
return base_class::bdb.get_performance_data_global();
}
private:
mutable performance_data m_performance_data;
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_key, class t_value, class t_accessor, bool is_t_strategy = false>
class solo_db_value
{
t_key m_key;
t_accessor& m_accessor;
public:
solo_db_value(const t_key& k, t_accessor& accessor) :m_accessor(accessor), m_key(k)
{}
solo_db_value(const solo_db_value& v) :m_accessor(v.m_accessor), m_key(v.m_key)
{}
solo_db_value& operator=(const solo_db_value&) = delete;
t_value operator=(t_value v)
{
m_accessor.template explicit_set<t_key, t_value, access_strategy_selector<is_t_strategy> >(m_key, v);
return v;
}
operator t_value() const
{
static_assert(std::is_pod<t_value>::value, "t_value must be a POD type.");
std::shared_ptr<const t_value> vptr = m_accessor.template explicit_get<t_key, t_value, access_strategy_selector<false> >(m_key);
if (vptr.get())
{
return *vptr.get();
}
return AUTO_VAL_INIT(t_value());
}
};
#pragma pack(push, 1)
struct guid_key
{
uint64_t a;
uint64_t b;
};
#pragma pack(pop)
//we use this suffix to keep elements count of sub-container, guid_key collision supposed to be impossible (almost)
// {E005D3C8-C9E9-4C2E-B94C-A40EC25505AD}
static const guid_key const_counter_suffix =
{ 0xe005d3c8c9e94c2e, 0xb94ca40ec25550ad};
#pragma pack(push, 1)
template<class t_key_a, class t_key_b>
struct composite_key
{
t_key_a container_id;
t_key_b sufix;
};
// template<class t_key>
// struct container_counter_key_holder : public composite_key<t_key, guid_key>
// {};
#pragma pack(pop)
/************************************************************************/
/* */
/************************************************************************/
template<class t_key, class t_value, bool is_t_access_strategy>
class basic_key_to_array_accessor : public basic_key_value_accessor<composite_key<t_key, uint64_t>, t_value, is_t_access_strategy>
{
typedef basic_key_value_accessor<composite_key<t_key, uint64_t>, t_value, is_t_access_strategy> basic_accessor_type;
// template<class t_key>
solo_db_value<composite_key<t_key, guid_key>, uint64_t, basic_accessor_type>
get_counter_accessor(const t_key& container_id)
{
static_assert(std::is_pod<t_key>::value, "t_pod_key must be a POD type.");
composite_key<t_key, guid_key> cc = { container_id, const_counter_suffix};
return solo_db_value<composite_key<t_key, guid_key>, uint64_t, basic_accessor_type >(cc, *this);
}
// template<class t_key>
const solo_db_value<composite_key<t_key, guid_key>, uint64_t, basic_accessor_type >
get_counter_accessor(const t_key& container_id) const
{
static_assert(std::is_pod<t_key>::value, "t_pod_key must be a POD type.");
composite_key<t_key, guid_key> cc = { container_id, const_counter_suffix };
return solo_db_value<composite_key<t_key, guid_key>, uint64_t, basic_accessor_type >(cc, const_cast<basic_accessor_type&>(static_cast<const basic_accessor_type&>(*this)));
}
public:
basic_key_to_array_accessor(basic_db_accessor& db) : basic_key_value_accessor<composite_key<t_key, uint64_t>, t_value, is_t_access_strategy>(db)
{}
uint64_t get_item_size(const t_key& k) const
{
return get_counter_accessor(k);
}
std::shared_ptr<const t_value> get_subitem(const t_key& k, uint64_t i) const
{
if (i >= get_item_size(k))
{
LOG_ERROR("Out of bound access: itmes_count = " << get_item_size(k) << ", i = " << i);
throw std::out_of_range("In basic_key_to_array_accessor");
}
composite_key<t_key, uint64_t> ck{ k, i };
return this->get(ck);
}
void push_back_item(const t_key& k, const t_value& v)
{
auto counter = get_counter_accessor(k);
uint64_t new_index = counter;
counter = new_index+1;
composite_key<t_key, uint64_t> ck{ k, new_index };
this->set(ck, v);
}
void pop_back_item(const t_key& k)
{
auto counter = get_counter_accessor(k);
uint64_t sz = static_cast<uint64_t>(counter);
CHECK_AND_ASSERT_MES(sz != 0, void(), "pop_back_item called on empty subitem");
composite_key<t_key, uint64_t> ck{ k, sz - 1 };
this->erase(ck);
counter = --sz;
}
// removes all items by key k
void erase_items(const t_key& k)
{
auto counter = get_counter_accessor(k);
uint64_t sz = static_cast<uint64_t>(counter);
while (sz != 0)
{
composite_key<t_key, uint64_t> ck{ k, sz - 1 };
this->erase(ck);
--sz;
}
counter = 0;
}
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_value, bool is_t_access_strategy>
class array_accessor : public cached_key_value_accessor<uint64_t, t_value, is_t_access_strategy, true>
{
public:
array_accessor(basic_db_accessor& db) : cached_key_value_accessor<uint64_t, t_value, is_t_access_strategy, true>(db)
{}
void push_back(const t_value& v)
{
this->set(this->size(), v);
}
void pop_back()
{
this->erase(this->size()-1);
}
std::shared_ptr<const t_value> back() const
{
auto res = this->get(this->size()-1);
CHECK_AND_ASSERT_THROW(res.get(), std::out_of_range(std::string("Out of range in array_accessor in call back(): size()=")
+ std::to_string(this->size())
+ ", size_no_cache()=" + std::to_string(this->size_no_cache()) ));
return res;
}
std::shared_ptr<const t_value> operator[] (const uint64_t& k) const
{
auto res = this->get(k);
CHECK_AND_ASSERT_THROW(res.get(), std::out_of_range(std::string("Out of range in array_accessor in call []: key = ")
+ std::to_string(k)
+ ", size_no_cache()=" + std::to_string(this->size_no_cache())));
return res;
}
};
/************************************************************************/
/* */
/************************************************************************/
template<class t_db>
class reader_access
{
t_db& m_db;
bool got_transaction;
public:
reader_access(t_db& db) :m_db(db), got_transaction(false)
{}
void lock()
{
//start read only transaction
if (m_db.is_open())
{
m_db.begin_transaction(true);
got_transaction = true;
}
}
void unlock()
{
if (got_transaction)
m_db.commit_transaction();
got_transaction = false;
}
};
}
}
#undef LOG_DEFAULT_CHANNEL
#define LOG_DEFAULT_CHANNEL NULL
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