@Override
	public boolean isSingleton() {
		return true;
	}
Parses the list of initial offsets and creates a map to initialize the {@link OffsetManager}

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