This is a ZeroMQ codec for Netty that aims to implement ZMTP, the ZeroMQ Message Transport Protocol versions 1.0 and 2.0 as specified in http://rfc.zeromq.org/spec:13 and http://rfc.zeromq.org/spec:15.

This project is hosted on https://github.com/spotify/netty-zmtp/

At Spotify we use ZeroMQ for a lot of the internal communication between services in the backend. As we implement more services on top of the JVM we felt the need for more control over the state of TCP connections, routing, message queue management, etc as well as getting better performance than seems to be currently possible with the JNI based JZMQ library.

This project implements the ZMTP wire protocol but not the ZeroMQ API, meaning that it can be used to communicate with other peers using e.g. ZeroMQ (libzmq) but it's not a drop-in replacement for JZMQ like e.g. JeroMQ attempts to be.

We have successfully used these handlers to implement services capable of processing millions of messages per second.

Currently this project targets Java 6 and Netty 3.x. It does not have any native dependency on e.g. libzmq.

To use netty-zmtp, insert one of ZMTP10Codec or ZMTP20Codec into your ChannelPipeline and it will turn incoming buffers into ZMTPIncomingMessage instances up the pipeline and accept ZMTPMessage instances that gets serialized into buffers downstream.

There is an open Google group for general development and usage discussion available at https://groups.google.com/group/netty-zmtp

We use the github issue tracker at https://github.com/spotify/netty-zmtp/issues

This software is licensed using the Apache 2.0 license. Details in the file LICENSE.txt