The Simple Network Framework for Java (SNF4J) is an asynchronous event-driven network application framework for quick and easy development of network applications.

The SNF4J serves as a simple, lightweight and independent network application framework helping in developing high performance and scalable network applications. It provides an asynchronous API via the Java NIO to handle various transports like TCP/IP, UDP/IP and SCTP/IP.

The framework is designed to be simple in use and moderately easy to understand. Application developers that like to keep their ear to the ground will not be overwhelmed by a tone of source code. It is oriented towards delivering core networking functionality as transferring data between two or more communicating network applications in a simple but effective way. To provide privacy and integrity of transferred data it provides support for the SSL/TLS/DTLS protocols.

• Unified API for transport layer types: TCP, UDP and SCTP
• Event-driven API for developing asynchronous network applications
• Customizable protocol engines for transport layer types: TCP and UDP
• Utilities for development of UDP server applications
• Simple API for customizable encoder-decoder pipelines
• Provide ease of programing multi-thread applications in a single-thread way
• Building pipelines of sessions sharing the same socket channel

• Support for minimized or even zero unnecessary memory copying
• Support for low memory utilization in multi-session applications
• Lower latency
• zlib and gzip compression
• Customizable selector loop pooling
• Customizable byte buffer allocators

• All handler's events (i.e. read, event, timer, exception, incident) are fired from the thread that performs I/O for the channel (I/O thread)
• All session's methods are thread-safe and can be called from any thread including the I/O thread and non-I/O threads
• Any handler's event triggered as a side effect of calling a session's method are fired from the I/O thread
• Codec's code is always processed in the I/O thread
• Engine's code is always processed in the I/O thread

• HTTP Web Proxy Connect Protocol
• SOCKS Protocols
• WebSocket Protocol
• Toolkit for TLS 1.3 Protocol (parsers/formatters, handshake engine, record layer utils and complete TLS engine)

• Complete support for SSL/TLS/DTLS protocols
• Secure Web Proxy Connect

• No additional dependencies, JDK 8 or JDK 9 (for DTLS) is enough
• Fully customizable logging (SLF4J, Log4j 2 already here)
• Customizable thread factories
• Customizable session timers
• Customizable packet retransmission models during DTLS handshakes

You need Apache maven 3.8 or above , Java 8 or above

mvn install

• Web Site
• @snf4jorg