Apply uniform formatting via clang-format
This commit is contained in:
parent
ff1fc3ebd4
commit
2e7d278c9b
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@ -30,3 +30,6 @@
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*.exe
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*.out
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*.app
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# Misc
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.clang-format
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@ -2,37 +2,35 @@
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#include "./lmdb-safe.hh"
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#include <boost/archive/binary_oarchive.hpp>
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#include <boost/archive/binary_iarchive.hpp>
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#include <boost/archive/binary_oarchive.hpp>
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#include <boost/serialization/vector.hpp>
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#include <boost/serialization/string.hpp>
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#include <boost/serialization/utility.hpp>
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#include <boost/serialization/vector.hpp>
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#include <boost/iostreams/device/back_inserter.hpp>
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#include <boost/iostreams/stream.hpp>
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#include <boost/iostreams/stream_buffer.hpp>
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#include <boost/iostreams/device/back_inserter.hpp>
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namespace LMDBSafe {
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template<typename T>
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std::string serToString(const T& t)
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template <typename T> std::string serToString(const T &t)
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{
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auto ret = std::string();
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auto inserter = boost::iostreams::back_insert_device<std::string>(ret);
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auto stream = boost::iostreams::stream<boost::iostreams::back_insert_device<std::string>>(inserter);
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auto oa = boost::archive::binary_oarchive(stream, boost::archive::no_header | boost::archive::no_codecvt);
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oa << t;
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return ret;
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auto ret = std::string();
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auto inserter = boost::iostreams::back_insert_device<std::string>(ret);
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auto stream = boost::iostreams::stream<boost::iostreams::back_insert_device<std::string>>(inserter);
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auto oa = boost::archive::binary_oarchive(stream, boost::archive::no_header | boost::archive::no_codecvt);
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oa << t;
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return ret;
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}
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template<typename T>
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void serFromString(string_view str, T& ret)
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template <typename T> void serFromString(string_view str, T &ret)
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{
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auto source = boost::iostreams::array_source(str.data(), str.size());
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auto stream = boost::iostreams::stream<boost::iostreams::array_source>(source);
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auto ia = boost::archive::binary_iarchive(stream, boost::archive::no_header|boost::archive::no_codecvt);
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ia >> ret;
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auto source = boost::iostreams::array_source(str.data(), str.size());
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auto stream = boost::iostreams::stream<boost::iostreams::array_source>(source);
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auto ia = boost::archive::binary_iarchive(stream, boost::archive::no_header | boost::archive::no_codecvt);
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ia >> ret;
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}
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}
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} // namespace LMDBSafe
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@ -6,31 +6,29 @@
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#include <reflective-rapidjson/lib/binary/reflector.h>
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#include <boost/iostreams/device/back_inserter.hpp>
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#include <boost/iostreams/stream.hpp>
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#include <boost/iostreams/stream_buffer.hpp>
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#include <boost/iostreams/device/back_inserter.hpp>
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namespace LMDBSafe {
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template<typename T>
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std::string serToString(const T& t)
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template <typename T> std::string serToString(const T &t)
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{
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auto ret = std::string();
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auto inserter = boost::iostreams::back_insert_device<std::string>(ret);
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auto stream = boost::iostreams::stream<boost::iostreams::back_insert_device<std::string>>(inserter);
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auto deserializer = ReflectiveRapidJSON::BinaryReflector::BinarySerializer(&stream);
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deserializer.write(t);
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return ret;
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auto ret = std::string();
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auto inserter = boost::iostreams::back_insert_device<std::string>(ret);
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auto stream = boost::iostreams::stream<boost::iostreams::back_insert_device<std::string>>(inserter);
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auto deserializer = ReflectiveRapidJSON::BinaryReflector::BinarySerializer(&stream);
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deserializer.write(t);
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return ret;
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}
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template<typename T>
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void serFromString(string_view str, T& ret)
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template <typename T> void serFromString(string_view str, T &ret)
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{
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auto source = boost::iostreams::array_source(str.data(), str.size());
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auto stream = boost::iostreams::stream<boost::iostreams::array_source>(source);
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auto serializer = ReflectiveRapidJSON::BinaryReflector::BinaryDeserializer(&stream);
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ret = T();
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serializer.read(ret);
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auto source = boost::iostreams::array_source(str.data(), str.size());
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auto stream = boost::iostreams::stream<boost::iostreams::array_source>(source);
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auto serializer = ReflectiveRapidJSON::BinaryReflector::BinaryDeserializer(&stream);
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ret = T();
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serializer.read(ret);
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}
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}
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} // namespace LMDBSafe
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437
lmdb-safe.cc
437
lmdb-safe.cc
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@ -3,369 +3,360 @@
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <mutex>
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#include <memory>
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#include <cstring>
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#include <map>
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#include <memory>
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#include <mutex>
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using namespace std;
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namespace LMDBSafe {
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MDBDbi::MDBDbi(MDB_env* env, MDB_txn* txn, const string_view dbname, unsigned int flags)
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MDBDbi::MDBDbi(MDB_env *env, MDB_txn *txn, const string_view dbname, unsigned int flags)
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{
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(void)env;
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// A transaction that uses this function must finish (either commit or abort) before any other transaction in the process may use this function.
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if(const auto rc = mdb_dbi_open(txn, dbname.empty() ? 0 : &dbname[0], flags, &d_dbi))
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throw LMDBError("Unable to open named database: ", rc);
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// Database names are keys in the unnamed database, and may be read but not written.
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(void)env;
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// A transaction that uses this function must finish (either commit or abort) before any other transaction in the process may use this function.
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if (const auto rc = mdb_dbi_open(txn, dbname.empty() ? 0 : &dbname[0], flags, &d_dbi))
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throw LMDBError("Unable to open named database: ", rc);
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// Database names are keys in the unnamed database, and may be read but not written.
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}
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MDBEnv::MDBEnv(const char* fname, unsigned int flags, mdb_mode_t mode, MDB_dbi maxDBs)
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MDBEnv::MDBEnv(const char *fname, unsigned int flags, mdb_mode_t mode, MDB_dbi maxDBs)
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{
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mdb_env_create(&d_env);
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if(const auto rc = mdb_env_set_mapsize(d_env, 16ULL * 4096 * 244140ULL)) { // 4GB
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throw LMDBError("Setting map size: ", rc);
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}
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// Various other options may also need to be set before opening the handle, e.g. mdb_env_set_mapsize(), mdb_env_set_maxreaders(), mdb_env_set_maxdbs(),
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if (const auto rc = mdb_env_set_maxdbs(d_env, maxDBs)) {
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throw LMDBError("Setting maxdbs: ", rc);
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}
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mdb_env_create(&d_env);
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if (const auto rc = mdb_env_set_mapsize(d_env, 16ULL * 4096 * 244140ULL)) { // 4GB
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throw LMDBError("Setting map size: ", rc);
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}
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// Various other options may also need to be set before opening the handle, e.g. mdb_env_set_mapsize(), mdb_env_set_maxreaders(), mdb_env_set_maxdbs(),
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if (const auto rc = mdb_env_set_maxdbs(d_env, maxDBs)) {
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throw LMDBError("Setting maxdbs: ", rc);
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}
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// we need MDB_NOTLS since we rely on its semantics
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if(const auto rc = mdb_env_open(d_env, fname, flags | MDB_NOTLS, mode)) {
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// If this function fails, mdb_env_close() must be called to discard the MDB_env handle.
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mdb_env_close(d_env);
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throw LMDBError("Unable to open database file " + std::string(fname) + ": ", rc);
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}
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// we need MDB_NOTLS since we rely on its semantics
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if (const auto rc = mdb_env_open(d_env, fname, flags | MDB_NOTLS, mode)) {
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// If this function fails, mdb_env_close() must be called to discard the MDB_env handle.
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mdb_env_close(d_env);
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throw LMDBError("Unable to open database file " + std::string(fname) + ": ", rc);
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}
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}
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void MDBEnv::incROTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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++d_ROtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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++d_ROtransactionsOut[std::this_thread::get_id()];
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}
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void MDBEnv::decROTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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--d_ROtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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--d_ROtransactionsOut[std::this_thread::get_id()];
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}
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void MDBEnv::incRWTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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++d_RWtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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++d_RWtransactionsOut[std::this_thread::get_id()];
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}
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void MDBEnv::decRWTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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--d_RWtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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--d_RWtransactionsOut[std::this_thread::get_id()];
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}
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int MDBEnv::getRWTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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return d_RWtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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return d_RWtransactionsOut[std::this_thread::get_id()];
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}
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int MDBEnv::getROTX()
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{
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std::lock_guard<std::mutex> l(d_countmutex);
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return d_ROtransactionsOut[std::this_thread::get_id()];
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std::lock_guard<std::mutex> l(d_countmutex);
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return d_ROtransactionsOut[std::this_thread::get_id()];
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}
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std::shared_ptr<MDBEnv> getMDBEnv(const char* fname, unsigned int flags, mdb_mode_t mode, MDB_dbi maxDBs)
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std::shared_ptr<MDBEnv> getMDBEnv(const char *fname, unsigned int flags, mdb_mode_t mode, MDB_dbi maxDBs)
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{
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struct Value
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{
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weak_ptr<MDBEnv> wp;
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unsigned int flags;
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};
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static std::map<tuple<dev_t, ino_t>, Value> s_envs;
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static std::mutex mut;
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struct stat statbuf;
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if(stat(fname, &statbuf)) {
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if(errno != ENOENT)
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throw LMDBError("Unable to stat prospective mdb database: " + string(strerror(errno)));
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else {
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std::lock_guard<std::mutex> l(mut);
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auto fresh = std::make_shared<MDBEnv>(fname, flags, mode, maxDBs);
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if(stat(fname, &statbuf))
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throw LMDBError("Unable to stat prospective mdb database: " + string(strerror(errno)));
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auto key = std::tie(statbuf.st_dev, statbuf.st_ino);
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s_envs[key] = {fresh, flags};
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return fresh;
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}
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}
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struct Value {
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weak_ptr<MDBEnv> wp;
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unsigned int flags;
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};
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std::lock_guard<std::mutex> l(mut);
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auto key = std::tie(statbuf.st_dev, statbuf.st_ino);
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auto iter = s_envs.find(key);
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if(iter != s_envs.end()) {
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auto sp = iter->second.wp.lock();
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if(sp) {
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if(iter->second.flags != flags)
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throw LMDBError("Can't open mdb with differing flags");
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static std::map<tuple<dev_t, ino_t>, Value> s_envs;
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static std::mutex mut;
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return sp;
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struct stat statbuf;
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if (stat(fname, &statbuf)) {
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if (errno != ENOENT)
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throw LMDBError("Unable to stat prospective mdb database: " + string(strerror(errno)));
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else {
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std::lock_guard<std::mutex> l(mut);
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auto fresh = std::make_shared<MDBEnv>(fname, flags, mode, maxDBs);
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if (stat(fname, &statbuf))
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throw LMDBError("Unable to stat prospective mdb database: " + string(strerror(errno)));
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auto key = std::tie(statbuf.st_dev, statbuf.st_ino);
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s_envs[key] = { fresh, flags };
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return fresh;
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}
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}
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else {
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s_envs.erase(iter); // useful if make_shared fails
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}
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}
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auto fresh = std::make_shared<MDBEnv>(fname, flags, mode, maxDBs);
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s_envs[key] = {fresh, flags};
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return fresh;
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std::lock_guard<std::mutex> l(mut);
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auto key = std::tie(statbuf.st_dev, statbuf.st_ino);
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auto iter = s_envs.find(key);
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if (iter != s_envs.end()) {
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auto sp = iter->second.wp.lock();
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if (sp) {
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if (iter->second.flags != flags)
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throw LMDBError("Can't open mdb with differing flags");
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return sp;
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} else {
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s_envs.erase(iter); // useful if make_shared fails
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}
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}
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auto fresh = std::make_shared<MDBEnv>(fname, flags, mode, maxDBs);
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s_envs[key] = { fresh, flags };
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return fresh;
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}
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MDBDbi MDBEnv::openDB(const string_view dbname, unsigned int flags)
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{
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unsigned int envflags;
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mdb_env_get_flags(d_env, &envflags);
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/*
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unsigned int envflags;
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mdb_env_get_flags(d_env, &envflags);
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/*
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This function must not be called from multiple concurrent transactions in the same process. A transaction that uses this function must finish (either commit or abort) before any other transaction in the process may use this function.
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*/
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std::lock_guard<std::mutex> l(d_openmut);
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if(!(envflags & MDB_RDONLY)) {
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auto rwt = getRWTransaction();
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MDBDbi ret = rwt->openDB(dbname, flags);
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rwt->commit();
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return ret;
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}
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std::lock_guard<std::mutex> l(d_openmut);
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MDBDbi ret;
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{
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auto rwt = getROTransaction();
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ret = rwt->openDB(dbname, flags);
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}
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return ret;
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if (!(envflags & MDB_RDONLY)) {
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auto rwt = getRWTransaction();
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MDBDbi ret = rwt->openDB(dbname, flags);
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rwt->commit();
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return ret;
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}
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MDBDbi ret;
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{
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auto rwt = getROTransaction();
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ret = rwt->openDB(dbname, flags);
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}
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return ret;
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}
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MDBRWTransactionImpl::MDBRWTransactionImpl(MDBEnv *parent, MDB_txn *txn):
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MDBROTransactionImpl(parent, txn)
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MDBRWTransactionImpl::MDBRWTransactionImpl(MDBEnv *parent, MDB_txn *txn)
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: MDBROTransactionImpl(parent, txn)
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{
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}
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MDB_txn *MDBRWTransactionImpl::openRWTransaction(MDBEnv *env, MDB_txn *parent, unsigned int flags)
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{
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MDB_txn *result;
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if(env->getRWTX())
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throw LMDBError("Duplicate RW transaction");
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MDB_txn *result;
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if (env->getRWTX())
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throw LMDBError("Duplicate RW transaction");
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for(int tries =0 ; tries < 3; ++tries) { // it might happen twice, who knows
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if(int rc=mdb_txn_begin(env->d_env, parent, flags, &result)) {
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if(rc == MDB_MAP_RESIZED && tries < 2) {
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// "If the mapsize is increased by another process (..) mdb_txn_begin() will return MDB_MAP_RESIZED.
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// call mdb_env_set_mapsize with a size of zero to adopt the new size."
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mdb_env_set_mapsize(env->d_env, 0);
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continue;
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}
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throw LMDBError("Unable to start RW transaction: ", rc);
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for (int tries = 0; tries < 3; ++tries) { // it might happen twice, who knows
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if (int rc = mdb_txn_begin(env->d_env, parent, flags, &result)) {
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if (rc == MDB_MAP_RESIZED && tries < 2) {
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// "If the mapsize is increased by another process (..) mdb_txn_begin() will return MDB_MAP_RESIZED.
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// call mdb_env_set_mapsize with a size of zero to adopt the new size."
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mdb_env_set_mapsize(env->d_env, 0);
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continue;
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}
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throw LMDBError("Unable to start RW transaction: ", rc);
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}
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break;
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}
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break;
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}
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env->incRWTX();
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return result;
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env->incRWTX();
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return result;
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}
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MDBRWTransactionImpl::MDBRWTransactionImpl(MDBEnv* parent, unsigned int flags):
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MDBRWTransactionImpl(parent, openRWTransaction(parent, nullptr, flags))
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MDBRWTransactionImpl::MDBRWTransactionImpl(MDBEnv *parent, unsigned int flags)
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: MDBRWTransactionImpl(parent, openRWTransaction(parent, nullptr, flags))
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{
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}
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MDBRWTransactionImpl::~MDBRWTransactionImpl()
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{
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MDBRWTransactionImpl::abort();
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MDBRWTransactionImpl::abort();
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}
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void MDBRWTransactionImpl::commit()
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{
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closeRORWCursors();
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if (!d_txn) {
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return;
|
||||
}
|
||||
closeRORWCursors();
|
||||
if (!d_txn) {
|
||||
return;
|
||||
}
|
||||
|
||||
if(const auto rc = mdb_txn_commit(d_txn)) {
|
||||
throw LMDBError("Committing transaction: ", rc);
|
||||
}
|
||||
environment().decRWTX();
|
||||
d_txn = nullptr;
|
||||
if (const auto rc = mdb_txn_commit(d_txn)) {
|
||||
throw LMDBError("Committing transaction: ", rc);
|
||||
}
|
||||
environment().decRWTX();
|
||||
d_txn = nullptr;
|
||||
}
|
||||
|
||||
void MDBRWTransactionImpl::abort()
|
||||
{
|
||||
closeRORWCursors();
|
||||
if (!d_txn) {
|
||||
return;
|
||||
}
|
||||
closeRORWCursors();
|
||||
if (!d_txn) {
|
||||
return;
|
||||
}
|
||||
|
||||
mdb_txn_abort(d_txn);
|
||||
// prevent the RO destructor from cleaning up the transaction itself
|
||||
environment().decRWTX();
|
||||
d_txn = nullptr;
|
||||
mdb_txn_abort(d_txn);
|
||||
// prevent the RO destructor from cleaning up the transaction itself
|
||||
environment().decRWTX();
|
||||
d_txn = nullptr;
|
||||
}
|
||||
|
||||
MDBROTransactionImpl::MDBROTransactionImpl(MDBEnv *parent, MDB_txn *txn):
|
||||
d_parent(parent),
|
||||
d_cursors(),
|
||||
d_txn(txn)
|
||||
MDBROTransactionImpl::MDBROTransactionImpl(MDBEnv *parent, MDB_txn *txn)
|
||||
: d_parent(parent)
|
||||
, d_cursors()
|
||||
, d_txn(txn)
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
MDB_txn *MDBROTransactionImpl::openROTransaction(MDBEnv *env, MDB_txn *parent, unsigned int flags)
|
||||
{
|
||||
if(env->getRWTX())
|
||||
throw LMDBError("Duplicate RO transaction");
|
||||
|
||||
/*
|
||||
A transaction and its cursors must only be used by a single thread, and a thread may only have a single transaction at a time. If MDB_NOTLS is in use, this does not apply to read-only transactions. */
|
||||
MDB_txn *result = nullptr;
|
||||
for(int tries = 0; tries < 3; ++tries) { // it might happen twice, who knows
|
||||
if(const auto rc = mdb_txn_begin(env->d_env, parent, MDB_RDONLY | flags, &result)) {
|
||||
if(rc == MDB_MAP_RESIZED && tries < 2) {
|
||||
// "If the mapsize is increased by another process (..) mdb_txn_begin() will return MDB_MAP_RESIZED.
|
||||
// call mdb_env_set_mapsize with a size of zero to adopt the new size."
|
||||
mdb_env_set_mapsize(env->d_env, 0);
|
||||
continue;
|
||||
}
|
||||
throw LMDBError("Unable to start RO transaction: ", rc);
|
||||
}
|
||||
break;
|
||||
}
|
||||
env->incROTX();
|
||||
if (env->getRWTX())
|
||||
throw LMDBError("Duplicate RO transaction");
|
||||
|
||||
return result;
|
||||
/*
|
||||
A transaction and its cursors must only be used by a single thread, and a thread may only have a single transaction at a time. If MDB_NOTLS is in use, this does not apply to read-only transactions. */
|
||||
MDB_txn *result = nullptr;
|
||||
for (int tries = 0; tries < 3; ++tries) { // it might happen twice, who knows
|
||||
if (const auto rc = mdb_txn_begin(env->d_env, parent, MDB_RDONLY | flags, &result)) {
|
||||
if (rc == MDB_MAP_RESIZED && tries < 2) {
|
||||
// "If the mapsize is increased by another process (..) mdb_txn_begin() will return MDB_MAP_RESIZED.
|
||||
// call mdb_env_set_mapsize with a size of zero to adopt the new size."
|
||||
mdb_env_set_mapsize(env->d_env, 0);
|
||||
continue;
|
||||
}
|
||||
throw LMDBError("Unable to start RO transaction: ", rc);
|
||||
}
|
||||
break;
|
||||
}
|
||||
env->incROTX();
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
void MDBROTransactionImpl::closeROCursors()
|
||||
{
|
||||
// we need to move the vector away to ensure that the cursors don’t mess with our iteration.
|
||||
std::vector<MDBROCursor*> buf;
|
||||
std::swap(d_cursors, buf);
|
||||
for (auto &cursor: buf) {
|
||||
cursor->close();
|
||||
}
|
||||
// we need to move the vector away to ensure that the cursors don’t mess with our iteration.
|
||||
std::vector<MDBROCursor *> buf;
|
||||
std::swap(d_cursors, buf);
|
||||
for (auto &cursor : buf) {
|
||||
cursor->close();
|
||||
}
|
||||
}
|
||||
|
||||
MDBROTransactionImpl::MDBROTransactionImpl(MDBEnv *parent, unsigned int flags):
|
||||
MDBROTransactionImpl(parent, openROTransaction(parent, nullptr, flags))
|
||||
MDBROTransactionImpl::MDBROTransactionImpl(MDBEnv *parent, unsigned int flags)
|
||||
: MDBROTransactionImpl(parent, openROTransaction(parent, nullptr, flags))
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
MDBROTransactionImpl::~MDBROTransactionImpl()
|
||||
{
|
||||
// this is safe because C++ will not call overrides of virtual methods in destructors.
|
||||
MDBROTransactionImpl::commit();
|
||||
// this is safe because C++ will not call overrides of virtual methods in destructors.
|
||||
MDBROTransactionImpl::commit();
|
||||
}
|
||||
|
||||
void MDBROTransactionImpl::abort()
|
||||
{
|
||||
closeROCursors();
|
||||
// if d_txn is non-nullptr here, either the transaction object was invalidated earlier (e.g. by moving from it), or it is an RW transaction which has already cleaned up the d_txn pointer (with an abort).
|
||||
if (d_txn) {
|
||||
d_parent->decROTX();
|
||||
mdb_txn_abort(d_txn); // this appears to work better than abort for r/o database opening
|
||||
d_txn = nullptr;
|
||||
}
|
||||
closeROCursors();
|
||||
// if d_txn is non-nullptr here, either the transaction object was invalidated earlier (e.g. by moving from it), or it is an RW transaction which has already cleaned up the d_txn pointer (with an abort).
|
||||
if (d_txn) {
|
||||
d_parent->decROTX();
|
||||
mdb_txn_abort(d_txn); // this appears to work better than abort for r/o database opening
|
||||
d_txn = nullptr;
|
||||
}
|
||||
}
|
||||
|
||||
void MDBROTransactionImpl::commit()
|
||||
{
|
||||
closeROCursors();
|
||||
// if d_txn is non-nullptr here, either the transaction object was invalidated earlier (e.g. by moving from it), or it is an RW transaction which has already cleaned up the d_txn pointer (with an abort).
|
||||
if (d_txn) {
|
||||
d_parent->decROTX();
|
||||
if (const auto rc = mdb_txn_commit(d_txn)) { // this appears to work better than abort for r/o database opening
|
||||
throw LMDBError("Error comitting transaction: ", rc);
|
||||
closeROCursors();
|
||||
// if d_txn is non-nullptr here, either the transaction object was invalidated earlier (e.g. by moving from it), or it is an RW transaction which has already cleaned up the d_txn pointer (with an abort).
|
||||
if (d_txn) {
|
||||
d_parent->decROTX();
|
||||
if (const auto rc = mdb_txn_commit(d_txn)) { // this appears to work better than abort for r/o database opening
|
||||
throw LMDBError("Error comitting transaction: ", rc);
|
||||
}
|
||||
d_txn = nullptr;
|
||||
}
|
||||
d_txn = nullptr;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
void MDBRWTransactionImpl::clear(MDB_dbi dbi)
|
||||
{
|
||||
if(const auto rc = mdb_drop(d_txn, dbi, 0)) {
|
||||
throw LMDBError("Error clearing database: ", rc);
|
||||
}
|
||||
if (const auto rc = mdb_drop(d_txn, dbi, 0)) {
|
||||
throw LMDBError("Error clearing database: ", rc);
|
||||
}
|
||||
}
|
||||
|
||||
MDBRWCursor MDBRWTransactionImpl::getRWCursor(const MDBDbi& dbi)
|
||||
MDBRWCursor MDBRWTransactionImpl::getRWCursor(const MDBDbi &dbi)
|
||||
{
|
||||
MDB_cursor *cursor;;
|
||||
if(const auto rc = mdb_cursor_open(d_txn, dbi, &cursor)) {
|
||||
throw LMDBError("Error creating RO cursor: ", rc);
|
||||
}
|
||||
return MDBRWCursor(d_rw_cursors, cursor);
|
||||
MDB_cursor *cursor;
|
||||
;
|
||||
if (const auto rc = mdb_cursor_open(d_txn, dbi, &cursor)) {
|
||||
throw LMDBError("Error creating RO cursor: ", rc);
|
||||
}
|
||||
return MDBRWCursor(d_rw_cursors, cursor);
|
||||
}
|
||||
|
||||
MDBRWCursor MDBRWTransactionImpl::getCursor(const MDBDbi &dbi)
|
||||
{
|
||||
return getRWCursor(dbi);
|
||||
return getRWCursor(dbi);
|
||||
}
|
||||
|
||||
MDBRWTransaction MDBRWTransactionImpl::getRWTransaction()
|
||||
{
|
||||
MDB_txn *txn;
|
||||
if (const auto rc = mdb_txn_begin(environment(), *this, 0, &txn)) {
|
||||
throw LMDBError("Failed to start child transaction: ", rc);
|
||||
}
|
||||
// we need to increase the counter here because commit/abort on the child transaction will decrease it
|
||||
environment().incRWTX();
|
||||
return MDBRWTransaction(new MDBRWTransactionImpl(&environment(), txn));
|
||||
MDB_txn *txn;
|
||||
if (const auto rc = mdb_txn_begin(environment(), *this, 0, &txn)) {
|
||||
throw LMDBError("Failed to start child transaction: ", rc);
|
||||
}
|
||||
// we need to increase the counter here because commit/abort on the child transaction will decrease it
|
||||
environment().incRWTX();
|
||||
return MDBRWTransaction(new MDBRWTransactionImpl(&environment(), txn));
|
||||
}
|
||||
|
||||
MDBROTransaction MDBRWTransactionImpl::getROTransaction()
|
||||
{
|
||||
return getRWTransaction();
|
||||
return getRWTransaction();
|
||||
}
|
||||
|
||||
MDBROTransaction MDBEnv::getROTransaction()
|
||||
{
|
||||
return MDBROTransaction(new MDBROTransactionImpl(this));
|
||||
return MDBROTransaction(new MDBROTransactionImpl(this));
|
||||
}
|
||||
MDBRWTransaction MDBEnv::getRWTransaction()
|
||||
{
|
||||
return MDBRWTransaction(new MDBRWTransactionImpl(this));
|
||||
return MDBRWTransaction(new MDBRWTransactionImpl(this));
|
||||
}
|
||||
|
||||
|
||||
void MDBRWTransactionImpl::closeRWCursors()
|
||||
{
|
||||
decltype(d_rw_cursors) buf;
|
||||
std::swap(d_rw_cursors, buf);
|
||||
for (auto &cursor: buf) {
|
||||
cursor->close();
|
||||
}
|
||||
decltype(d_rw_cursors) buf;
|
||||
std::swap(d_rw_cursors, buf);
|
||||
for (auto &cursor : buf) {
|
||||
cursor->close();
|
||||
}
|
||||
}
|
||||
|
||||
MDBROCursor MDBROTransactionImpl::getCursor(const MDBDbi& dbi)
|
||||
MDBROCursor MDBROTransactionImpl::getCursor(const MDBDbi &dbi)
|
||||
{
|
||||
return getROCursor(dbi);
|
||||
return getROCursor(dbi);
|
||||
}
|
||||
|
||||
MDBROCursor MDBROTransactionImpl::getROCursor(const MDBDbi &dbi)
|
||||
{
|
||||
MDB_cursor *cursor;
|
||||
if(const auto rc = mdb_cursor_open(d_txn, dbi, &cursor)) {
|
||||
throw LMDBError("Error creating RO cursor: ", rc);
|
||||
}
|
||||
return MDBROCursor(d_cursors, cursor);
|
||||
MDB_cursor *cursor;
|
||||
if (const auto rc = mdb_cursor_open(d_txn, dbi, &cursor)) {
|
||||
throw LMDBError("Error creating RO cursor: ", rc);
|
||||
}
|
||||
return MDBROCursor(d_cursors, cursor);
|
||||
}
|
||||
|
||||
}
|
||||
} // namespace LMDBSafe
|
||||
|
|
|
|||
908
lmdb-safe.hh
908
lmdb-safe.hh
File diff suppressed because it is too large
Load Diff
|
|
@ -2,15 +2,15 @@
|
|||
|
||||
namespace LMDBSafe {
|
||||
|
||||
unsigned int MDBGetMaxID(MDBRWTransaction& txn, MDBDbi& dbi)
|
||||
unsigned int MDBGetMaxID(MDBRWTransaction &txn, MDBDbi &dbi)
|
||||
{
|
||||
auto cursor = txn->getRWCursor(dbi);
|
||||
MDBOutVal maxidval, maxcontent;
|
||||
unsigned int maxid{0};
|
||||
if(!cursor.get(maxidval, maxcontent, MDB_LAST)) {
|
||||
maxid = maxidval.get<unsigned int>();
|
||||
}
|
||||
return maxid;
|
||||
auto cursor = txn->getRWCursor(dbi);
|
||||
MDBOutVal maxidval, maxcontent;
|
||||
unsigned int maxid{ 0 };
|
||||
if (!cursor.get(maxidval, maxcontent, MDB_LAST)) {
|
||||
maxid = maxidval.get<unsigned int>();
|
||||
}
|
||||
return maxid;
|
||||
}
|
||||
|
||||
}
|
||||
} // namespace LMDBSafe
|
||||
|
|
|
|||
1168
lmdb-typed.hh
1168
lmdb-typed.hh
File diff suppressed because it is too large
Load Diff
Loading…
Reference in New Issue