nplex-cpp

The official C++20 client library for nplex — a reactive, key-value database with ACID guarantees designed for scenarios where low-latency reads, real-time change notifications, and minimal resource consumption matter.

Features

• High performance — A single client can sustain >40,000 commits/s on modest hardware (NUC7i7BNH).
• Blazing-fast reads — Data lives in client memory; reads never hit the server.
• Multi-thread support — Multiple threads can create and submit transactions concurrently.
• Three isolation levels — READ_COMMITTED, REPEATABLE_READ, and SERIALIZABLE.
• Reactor pattern — Register a reactor to receive real-time change notifications on every commit.
• ACID transactions — Atomic, Consistent, Isolated, and Durable.
• Flexible connection — Automatic reconnection and configurable timeout/back-pressure parameters.
• Comprehensive tests — Unit tests, covering messaging, transactions, storage, address parsing, and more.

Building

Prerequisites

Install the required shared libraries before building:

• libuv — cross-platform asynchronous I/O.
• {fmt} — string formatting library.
• flatbuffers — memory-efficient serialization library (including the flatc compiler).

Compilation

mkdir -p build
cd build
# Normal build (Release)
cmake -DCMAKE_BUILD_TYPE=Release ..
make -j$(nproc)

Other Targets

# Debug build (default)
cmake -DCMAKE_BUILD_TYPE=Debug ..
make -j$(nproc)# Run unit tests
ctest -V
# AddressSanitizer + UndefinedBehaviorSanitizer
cmake -DENABLE_SANITIZERS=ON ..
make -j$(nproc)
ctest -V
# ThreadSanitizer
cmake -DENABLE_THREAD_SANITIZER=ON ..
make -j$(nproc)
ctest -V
# Profiling
cmake -DENABLE_PROFILER=ON ..
make -j$(nproc)
./example1
gprof ./example1 gmon.out
# Coverage
cmake -DENABLE_COVERAGE=ON ..
make -j$(nproc)
ctest -V
# Valgrind — memory check
valgrind --tool=memcheck --leak-check=yes ./example1
# Valgrind — thread check
valgrind --tool=helgrind --read-var-info=yes ./example1
# Count lines of code (excluding generated files)
cloc --exclude-content="automatically generated" include src test# Static analysis
cppcheck --enable=all --inconclusive --std=c++20 --force \
--suppress=missingIncludeSystem --suppress=unusedFunction \
--suppress=useInitializationList --suppress=noExplicitConstructor \
--suppress=cstyleCast -Ideps -Isrc -Iinclude src
# clang-tidy (uncomment CMAKE_CXX_CLANG_TIDY in CMakeLists.txt)
cmake ..
make -j$(nproc)

Examples & Tools

Binary	Type	Purpose
example1	Example	Minimal connection, read, ping and submit demo
functests	Tool	Functional tests for isolation levels
flooder	Tool	Performance/load generator for write traffic
watcher	Tool	Prints DB/session snapshots and streams updates in JSON

All binaries support -h / --help, where the available parameters are documented.

Dependencies

Static

Library	Description	License
FastGlobbing	Wildcard pattern matching	CPOL
cstring	Immutable C-string with reference counting	LGPL-3.0
cqueue	Circular queue	LGPL-3.0
base64	Base64 encoder / decoder	MIT
utf8.h	UTF-8 string functions	Unlicense
doctest	Testing framework	MIT license

Shared

Library	Description	License
{fmt}	String formatting	MIT
libuv	Cross-platform async I/O	MIT
flatbuffers	Efficient binary serialization	Apache-2.0

Maintainers

This project is maintained by Gerard Torrent (torrentg).

License

This project is licensed under the MIT License - see the LICENSE file for details.