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Simple, fast, flexible event router / event bus for Java
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package com.terheyden.event;
import java.util.Collection;
import java.util.concurrent.ThreadPoolExecutor;
/**
* If event {@code MyEvent} is published and there are 3 subscribers,
* then 3 sendEventToSubscribers tasks are created and run on the thread pool in this publisher.
*/
class EventQuerySendAsyncStrategy extends ExceptionHandlingSendEventStrategy {
private final ThreadPoolExecutor threadPool;
EventQuerySendAsyncStrategy(SubscriberExceptionHandler exceptionHandler, ThreadPoolExecutor threadPool) {
super(exceptionHandler);
this.threadPool = threadPool;
}
@Override
@SuppressWarnings("unchecked")
public void sendEventToSubscribers(
EventRequest eventRequest,
Collection subscribers) {
subscribers
.stream()
.map(sub -> (EventQuerySubscription) sub)
.forEach(sub ->
threadPool.execute(() -> sendEventToSubscriber(sub, eventRequest)));
}
private void sendEventToSubscriber(EventQuerySubscription sub, EventRequest eventRequest) {
try {
SendStrategies.sendQueryEventResponse(eventRequest, sub);
} catch (Exception e) {
handleException(e, eventRequest);
}
}
}