NetworkEventSimulator.java

package learningspringboot;

import java.time.LocalDateTime;
import java.util.Random;

import org.springframework.jms.core.JmsTemplate;
import org.springframework.scheduling.annotation.Scheduled;

public class NetworkEventSimulator {

	final private JmsTemplate jmsTemplate;
	final private String destination;

	public NetworkEventSimulator(JmsTemplate jmsTemplate,
								 String destination) {
		this.jmsTemplate = jmsTemplate;
		this.destination = destination;
	}

	@Scheduled(fixedRate = 1000L)
	public void simulateActivity() {

		Random random = new Random();

		String hostname;
		switch (random.nextInt(3)) {
			case 0: hostname = "router101"; break;
			case 1: hostname = "multiplex205"; break;
			default: hostname = "switch1143"; break;
		}

		Severity severity;
		switch (random.nextInt(4)) {
			case 0: severity = Severity.UP; break;
			case 1: severity = Severity.DEGRADED; break;
			case 2: severity = Severity.JEOPARDY; break;
			default: severity = Severity.DOWN; break;
		}
		Alarm event = new Alarm(hostname, LocalDateTime.now(),
				severity);
		jmsTemplate.convertAndSend(destination, event);
	}

}