Consequences

• modularity
• configurability of event-driven software
• decoupling application-independent mechanisms from application-specific processing policies
• improves portability -- abstracts from OS
• course grained concurrency control

Disadvantages

• handlers are not pre-empted
• flow of control is event-driven
• applications can be hard to debug

Applications

• (X) Windows, Interviews, hush
• Orbacus Omnibroker

Related Patterns

• Observer, Facade, Template Method