BindReceiver

BindReceiver is a pattern used in event-driven and message-oriented systems to connect a handler or receiver to a source of events. The binding establishes a contract by which the receiver is invoked when the source emits a matching event, message, or signal. The goal is to decouple producers from consumers and to enable dynamic subscription and lifecycle management.

Key roles include the event source, the receiver, and the binding component or dispatcher. The binding stores references to the receiver and the criteria for invocation (such as event type or topic). When the source emits an event, the dispatcher checks bindings and invokes the appropriate receivers, passing along event data.

Bindings are often created with lifecycle awareness; they can be registered and unregistered at runtime. Thread safety and backpressure considerations are common concerns; some systems use asynchronous dispatch or executors.

Common in GUI frameworks, messaging systems, and reactive streams. Example: BindReceiver.bind(source, type, receiver); onEvent(event) triggers if event.type matches. On disposal, unbind called.

The pattern offers loose coupling and modularity but can introduce complexity and risk of leaks if bindings are not cleaned up. Related concepts include the observer pattern, publish-subscribe architectures, event buses, and callback binding.