Snippet

Optimized Event Handling with GenericApplicationListener

GenericApplicationListener allows for ultra-granular filtering of events before they reach the listener logic, checking both the event type and the source, which improves performance in high-throughput systems.

snippet.java

java

@Component
public class SelectiveEventListener implements GenericApplicationListener {
    @Override
    public boolean supportsEventType(ResolvableType eventType) {
        return OrderPlacedEvent.class.isAssignableFrom(eventType.getRawClass());
    }
 
    @Override
    public boolean supportsSourceType(Class<?> sourceType) {
        return ExternalSystem.class.equals(sourceType);
    }
 
    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        // Logic for specific event and source
    }
}

spring

Breakdown

implements GenericApplicationListener

Provides low-level hooks for smart event filtering.

supportsEventType(ResolvableType eventType)

Determines if this listener should process the specific event class.

supportsSourceType(Class<?> sourceType)

Filters events based on the origin (source) of the event.

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Optimized Event Handling with GenericApplicationListener

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