Cohorte-Herald 0.0.3

An easy-to-use messaging framework

Herald is an easy-to-use messaging framework. It allows Pelix/iPOPO and Java OSGi frameworks to communicate with each other using messages, without worrying about the underlying protocol used for transmission.

The project is hosted on GitHub isandlaTech/cohorte-herald. Issues and questions can be posted in project Issues section.

Concepts

Each Pelix framework instance is considered as a peer. A peer has a unique ID and a human-readable name. An application ID is associated to each peer: only peers with the same application ID can discover each other.

A peer can send a message to another peer or to a group of peers. A message has a subject, which listeners register to, and a content.

Remote Services

Herald provides an RPC transport implementations for Pelix Remote Services.

Transports

Currently, Herald supports two protocols in Python, and one in Java:

• HTTP (Python & Java):

  • Each message is sent as a POST request.

  • Peer discovery is based on a home-made multicast heart beat protocol

  • Best transport for LAN applications and for single-peer messages

  • Implementation is based on requests.

• XMPP (Python only, for now):

  • Each message is a either a message or a group message

  • Discovery is based on a Multi-User Chat room (XEP-0045)

  • Best transport for distributed applications and for group messages

  • Implementation is based on SleekXMPP

License

Cohorte Herald is released under the terms of the Apache Software License 2.0.