@ModuleOption("the time delay between polls for data, expressed in TimeUnits (seconds by default)")
	public void setFixedDelay(int fixedDelay) {
		this.fixedDelay = fixedDelay;
	}
Subclasses should provide a default value for collectionName.
spring-xd-module-spi/src/main/java/org/springframework/xd/module/options/mixins/FromMongoDbOptionMixin.java