Abstract: A business process analysis system provides a platform for process modeling and simulation in a collaborative environment. The system includes a series of client stations connected to servers over a network. The platform is suitable for operating on an internal, local enterprise network or a group of systems across multiple locations, or in a cloud-based or other environment. The servers maintain business process models being created or edited at one or more clients. The servers also run simulations of the models. A collaboration server controls changes to the business process model. A history of revisions is maintained in a content management system. An interactive work site provides relevant information regarding the business process models, such as a listing of the latest changes to the model, user-submitted commentary, discussions, and additional files relating to the model.

Abstract: A fault-tolerant messaging system comprises a primary broker, a first network, a back up broker, and a second network. The primary broker and the back up broker are coupled to the first network for communication with clients thus creating a messaging system. The primary broker and the back up broker are also coupled to the second network for replicating state from the primary broker and the back up broker, and also sending transaction events immediately to maintain synchronization. The brokers further comprise a replication module for communicating state between the primary broker and the back up broker, a recovery module for performing recovery on the back up broker upon failure of the primary broker, and a fault-tolerant connection module for establishing a fault-tolerant connection between the primary broker and the back up broker over the second network. The present invention also includes a number of novel methods for performing fault tolerance.