protected void throwDefinitionAlreadyExistsException(D definition) {
		throw new DefinitionAlreadyExistsException(definition.getName(), String.format(
				"There is already a %s named '%%s'", definitionKind));
	}
Callback method that subclasses may override to get a chance to act on newly saved definitions.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/AbstractDeployer.java