@ModuleOption(value = "the maximum number of messages held internally and waiting for processing, " +
			"per concurrent handler. Value must be a power of 2")
	public void setQueueSize(int queueSize) {
		this.queueSize = queueSize;
	}
Module options for Kafka source module.

@author Ilayaperumal Gopinathan
@author Marius Bogoevici
extensions/spring-xd-extension-kafka/src/main/java/org/springframework/integration/x/kafka/KafkaSourceModuleOptionsMetadata.java