Filter deployment method and agent for event channel networks

摘要

A method and Agent for deploying new filter constraints in a plurality of network-filters in an Event Channel Network, ECN. When a consumer is added or deleted, or if event types subscribed to by a consumer change, the Agent calculates the filter constraints and their placement in the ECN. The Agent includes a network model having a plurality of model-filters corresponding to network-filters in the ECN. The Agent identifies the model-filters affected by the new filter constraints, and passes the new filter constraints to the network-filters corresponding to the identified model-filters. Each network-filter sends a bleeder message downstream with its identifier. When a network-filter has received all required bleeder messages from upstream network-filters, it activates the new filter constraints and sends an all-bleeders-detected message to the Agent. When all of the network-filters requiring new constraints have sent an all-bleeders-detected message to the Agent, the Agent provides a go-ahead to the requesting consumer, and establishes a contract with the requesting consumer to deliver the requested event types.