Event Bus

Hammurapi Group Event Bus is an embedded event dispatching and forward-reasoning inference engine for Java.

• Parallel predicate evaluation.
• Parallel handler execution.
• Handler priority.
• One-off handlers.
• Event consumption.
• Event correlation, multi-event handlers.
• Inference
  • Predicate (condition) chaining.
  • Cost based predicate chaining.
  • Handler (event) chaining.
  • Infinite inference loop detection and prevention.
  • Pluggable event matchers.
• Live changes in the bus structure (add/remove handlers).
• Listening for changes in mutable events.
• Small footprint.
• Java binding
  • Method and parameter level annotations to wrap Java methods into handlers.
  • Scripted method and parameter level conditions.
  • Compilation to "extremely pure" Java - no reflection, no scripted code, even smaller footprint.
• Development and troubleshooting aids
  • Event bus snapshot.
  • Snapshot browser/visualizer.
  • Derivation tracking.
• Pure Java - no XML or other configuration files, no specialized languages and/or editors.
• Support of memory-sensitive (weak or soft) event store (working memory).
• JMX Monitoring.
• Runs on Java 6 SE and Android.

• Decoupled more resilient application logic.
• Increased concurrency, reduced response time.
• Less plumbing code to write.
• Embedded inference.

Free for evaluation and non-commercial use. Contact to obtain commercial license.

Beta. 50% overall line coverage (with dependencies), ~70% line coverage for the Event Bus per se.

• Java 6.
• Android 2.0+.
• Eclipse Helios or above for browsing event bus snapshots (not required for runtime).

• Online documentation.
• JavaDoc.
• Release notes.

http://www.hammurapi.com/products/eventbus/updatesite

Event Bus & Hammurapi Rules discussion forum