A default event bus implementation that synchronously publishes events to registered listeners. Listeners can be registered or unregistered for events as necessary. <p/> An event bus enables a publish/subscribe paradigm within Shiro - components can publish or consume events they find relevant without needing to be tightly coupled to other components. This affords great flexibility within Shiro by promoting loose coupling and high cohesion between components and a much safer pluggable architecture that is more resilient to change over time. <h2>Sending Events</h2> If a component wishes to publish events to other components: <pre> MyEvent myEvent = createMyEvent(); eventBus.publish(myEvent); </pre> The event bus will determine the type of event and then dispatch the event to components that wish to receive events of that type. <h2>Receiving Events</h2> A component can receive events of interest by doing the following. <ol> <li>For each type of event you wish to consume, create a method that accepts a single event argument. The method argument type indicates the type of event to receive.</li> <li>Annotate each of these methods with the {@link hunt.shiro.event.Subscribe Subscribe} annotation.</li> <li>Register the component with the event bus: <pre> eventBus.register(myComponent); </pre> </li> </ol> After registering the component, when when an event of a respective type is published, the component's {@code Subscribe}-annotated method(s) will be invoked as expected.