protected BridgeHandler bridge(String name, MessageChannel from, MessageChannel to, String bridgeName,
			LocalBusPropertiesAccessor properties) {
		return bridge(name, from, to, bridgeName, null, properties);
	}
Looks up or creates a DirectChannel with the given name and creates a bridge to that channel from the provided
channel instance.
spring-xd-messagebus-local/src/main/java/org/springframework/xd/dirt/integration/bus/local/LocalMessageBus.java