Levin provide a highly efficient solution in bulk loading scene. A collection of STL-like containers implemented with high performance and memory efficiency. Levin containers arrange memory layout SEQUENTIALLY, allocated at share memory region for reused inter-process. which prolongs the lifetime of data resources, and prevents unnecessary time-consuming reload.

Loading with levin speed, let's get started.

• Brief Intro for Levin Container

• How to Dump Container

// vector dump demo
std::vector<int> vec_data = {1, 2, 3, 4, 5};
levin::SharedVector<int>::Dump("./vec_demo.dat", vec_data);

// map/hashmap dump demo
std::unordered_map<int64_t, int32_t> map_data = { {1, 100}, {2, 200}, {3, 300} };
// or std::map<int64_t, int32_t> map_data = { {1, 100}, {2, 200}, {3, 300} };
levin::SharedHashMap<int64_t, int32_t>::Dump("./map_demo.dat", map_data);

• How to Use Container

Tips: Levin container SHOULD be used as static data, NOT suggest to modify or reallocate.

// shared vector use demo
levin::SharedVector<int> vec("./vec_demo.dat");
if (vec.Init() == levin::SC_RET_OK && vec.Load() == levin::SC_RET_OK) {
    ...
}
vec.Destroy();

// shared hashmap use demo
auto map_ptr = new levin::SharedHashMap<int64_t, int32_t>("./map_demo.dat");
if (map_ptr->Init() == levin::SC_RET_OK && map_ptr->Load() == levin::SC_RET_OK) {
    ...
}
map_ptr->Destroy();
delete map_ptr;

• How to Manage a set of Containers

example code of container manager usage

Levin depends on following packages, supported deps:

• gcc >= 4.8.5
• cmake >= 2.6.0
• boost >= 1.56.0
• openssl
• gtest

• create directory build, cd build
• compile: cmake .. && make

About the details, please see Wiki.

Welcome to contribute by creating issues or sending pull requests. See Contributing Guide for guidelines.

Levin is licensed under the Apache License 2.0. See the LICENSE file.