Version 27 (modified by bartek, 13 years ago) (diff)

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QCG-Notification

QCG-Notification is an open source implementation of the family of WS-Notification standards (Base Notification, Brokered Notification and Topics). It supports the topic-based publish/subscribe pattern for the asynchronous message exchange among Web Services and other involved entities. The main architecture of our system is based on a highly efficient, extended version of the Notification Broker, managing all items participating in notification events. Today, QCG-Notification offers sophisticated notification capabilities, e.g. notification message filtering, push and pull messages delivery, and it was successfully integrated with different communication protocols as well as various Web Services' security mechanisms. The modular architecture of QCG-Notification also provides a great opportunity for developers to build new extensions and plugins to meet other specific requirements.

Features

From the architecture perspective, QCG-Notification exposes a well-defined Web Service interface corresponding to the role of Notification Broker as well as it offers other standard interfaces for managing Subscriptions and Pull Points. It supports advanced two-layer notification filtering based on hierarchical topic namespaces and XPath queries on the content of messages.

All funtions offered by QCG-Notification can be invoked using different transport protocols. Currently, our system supports the SOAP communication over HTTP, HTTPS, and additionally XMPP. Thanks to the XMPP based communication, all notification parties, namely Subscribers, Publishers, Notification Consumers and QCG-Notification itself, can be located behind firewalls with only well defined outgoing TCP/IP port open for the XMPP transport communication.

Performance

The low-level architecture of QCG-Notification is based on highly efficient mechanisms and data structures. In performed tests we sent 1000 notification messages via different WS-Notification implementations. The obtained results clearly show that QCG-Notification outperforms competitors.

Installation

Please refer to the  Downloads section to get the most recent QCG-Notification packages (cf.  Changelog) and corresponding Software Development Kits (SDKs). The page QCG-Notification Installation describes a basic installation and configuration procedure. If you realize more challenging tasks refer to the QCG-Notification manual distributed in the doc directory of QCG-Notification package. When you want to deploy entire QosCosGrid stack you may also follow QCG-Notification installation in QosCosGrid.

Related software

  •  QCG-Core - generic library, must be installed in the system prior to the installation of QCG-Notification.
  • QCG-XMPP - plugins for Pidgin may be utilized for enabling WS-Notifications in the popular XMPP communicator.

Applications

  • QosCosGrid - In this projectd QCG-Notification together with other Web Services using the QosCosGrid framework, in particular QCG-Computing, was used to build highly efficient grid middleware for cross-cluster parallel application execution and monitoring.
  • BREIN - QCG-Notification was demonstrated in asynchronous and dynamic message exchange in a distributed IT system controlling some events generated by an example airport management system, such as flight delays, SLA violations, etc.
  • PL-Grid - QCG-Notification is going to be productively used under the national grid infrastructure initiative in Poland.
  • Mapper - In the Mapper project, QosCosGrid stack is exploited to perform multiscale computations on EGI and PRACE resources.

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