Because it is the simpler of the two, we will cover the Event-Driven Consumer endpoint first. You may recall that the SubscribableChannel interface provides a subscribe() method and that the method accepts a MessageHandler parameter (as shown in Section 3.1.2, “SubscribableChannel”):

subscribableChannel.subscribe(messageHandler);

Since a handler that is subscribed to a channel does not have to actively poll that channel, this is an Event-Driven Consumer, and the implementation provided by Spring Integration accepts a a SubscribableChannel and a MessageHandler:

SubscribableChannel channel = (SubscribableChannel) context.getBean("exampleSubscribableChannel");

EventDrivenConsumer consumer = new EventDrivenConsumer(channel, exampleHandler);