JBoss.orgCommunity Documentation

Chapter 3. SLA

3.1. Monitor
3.1.1. Overview
3.1.2. Installation
3.1.3. Running the Example
3.1.4. Summary

This example, located in the samples/sla/monitor folder, demonstrates an approach to provide "Service Level Agreement" monitoring. This example makes uses of the example Switchyard application located in the samples/ordermgmt folder.

This example will show how:

  • activity event analysis, using the Event Processor Network mechanism, can be used to implement Service Level Agreements

    • uses the Complex Event Processing (CEP) based event processor (using Drools Fusion)
  • impending or actual SLA violations can be reported for the attention of end users, via

    • JMX notifications
    • REST service
  • to build a custom application to access the analysis results

This example shows a simple Service Level Agreement that checks whether a service response time exceeds expected levels. The CEP rule detects whether a situation of interest has occurred, and if so, creates a org.overlord.rtgov.analytics.situation.Situation object and initializes it with the appropriate description/severity information, before forwarding it back into the EPN. This results in the "Situation" object being published as a notification on the "Situations" subject.

The CEP rule is:

import org.overlord.rtgov.analytics.service.ResponseTime
import org.overlord.rtgov.analytics.situation.Situation

global org.overlord.rtgov.ep.EPContext epc

declare ResponseTime
    @role( event )
end

rule "check for SLA violations"
when
    $rt : ResponseTime() from entry-point "ServiceResponseTimes"
then

	if ($rt.getAverage() > 200) {
		epc.logError("\r\n\r\n**** RESPONSE TIME "+$rt.getAverage()+"ms EXCEEDED SLA FOR "+$rt.getServiceType()+" ****\r\n");

		Situation situation=new Situation();

		situation.setType("SLA Violation");
		situation.setSubject(Situation.createSubject($rt.getServiceType(), $rt.getOperation(),
						$rt.getFault()));
		situation.setTimestamp(System.currentTimeMillis());

		situation.getProperties().putAll($rt.getProperties());

		if ($rt.getRequestId() != null) {
			situation.getActivityTypeIds().add($rt.getRequestId());
		}
		if ($rt.getResponseId() != null) {
			situation.getActivityTypeIds().add($rt.getResponseId());
		}

		situation.getContext().addAll($rt.getContext());

		String serviceName=$rt.getServiceType();

		if (serviceName.startsWith("{")) {
			serviceName = javax.xml.namespace.QName.valueOf(serviceName).getLocalPart();
		}

		if ($rt.getAverage() > 400) {
			situation.setDescription(serviceName+" exceeded maximum response time of 400 ms");
			situation.setSeverity(Situation.Severity.Critical);
		} else if ($rt.getAverage() > 320) {
			situation.setDescription(serviceName+" exceeded response time of 320 ms");
			situation.setSeverity(Situation.Severity.High);
		} else if ($rt.getAverage() > 260) {
			situation.setDescription(serviceName+" exceeded response time of 260 ms");
			situation.setSeverity(Situation.Severity.Medium);
		} else {
			situation.setDescription(serviceName+" exceeded response time of 200 ms");
			situation.setSeverity(Situation.Severity.Low);
		}

		epc.handle(situation);
	}

end

The "out of the box" active collection configuration is pre-initialized with a collection for the org.overlord.rtgov.analytics.situation.Situation objects, subscribing to the "Situations" subject from the Event Processor Network. Therefore any detected SLA violations will automatically be stored in this collection (accessible via a RESTful service), and reported to the associated JMX notifier.

To demonstrate a Service Level Agreement violation, we will send the following message to the example Switchyard application at the following URL: http://localhost:8080/demo-orders/OrderService

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
      <orders:submitOrder xmlns:orders="urn:switchyard-quickstart-demo:orders:1.0">
         <order>
            <orderId>3</orderId>
            <itemId>JAM</itemId>
            <quantity>400</quantity>
            <customer>Fred</customer>
         </order>
      </orders:submitOrder>
   </soap:Body>
</soap:Envelope>

The message can be sent using an appropriate SOAP client (e.g. SOAP-UI) or by running the test client available with the Switchyard application, by running the following command from the ${rtgov}/samples/ordermgmt/app folder:

mvn exec:java -Dreq=order3

The itemId of "JAM" causes a delay to be introduced in the service, resulting in a SLA violation being detected. This violation can be viewed using two approaches:

Using a suitable REST client, send the following POST to: http://localhost:8080/overlord-rtgov/acm/query (using content-type of "application/json", username is admin and password is overlord)

{
    "collection" : "Situations"
}

This will result in the following response:


As well as having access to the information via REST or JMX, it may also be desirable to have more direct access to the active collection results. This section describes the custom app defined in the ${rtgov}/samples/sla/monitor folder.

The following code shows how the custom application initializes access to the relevant active collections:

@Path("/monitor")
@ApplicationScoped
public class SLAMonitor {

    private static final String SERVICE_RESPONSE_TIMES = "ServiceResponseTimes";
    private static final String SITUATIONS = "Situations";

    private static final Logger LOG=Logger.getLogger(SLAMonitor.class.getName());

    private ActiveCollectionManager _acmManager=null;

    private ActiveList _serviceResponseTime=null;
    private ActiveList _situations=null;

    /**
     * This is the default constructor.
     */
    public SLAMonitor() {

        try {
            _acmManager = ActiveCollectionManagerAccessor.getActiveCollectionManager();

            _serviceResponseTime = (ActiveList)
                    _acmManager.getActiveCollection(SERVICE_RESPONSE_TIMES);

            _situations = (ActiveList)
                    _acmManager.getActiveCollection(SITUATIONS);

        } catch (Exception e) {
            LOG.log(Level.SEVERE, "Failed to initialize active collection manager", e);
        }

    }

Then when the REST request is received (e.g. for SLA violations defined as Situations),

    @GET
    @Path("/situations")
    @Produces("application/json")
    public java.util.List<Situation> getSituations() {
        java.util.List<Situation> ret=new java.util.ArrayList<Situation>();

        for (Object obj : _situations) {
            if (obj instanceof Situation) {
                ret.add((Situation)obj);
            }
        }

        return (ret);
    }

To see the SLA violations, send a REST GET request to: http://localhost:8080/slamonitor-monitor/monitor/situations

This will return the following information:


It is also possible to request the list of response time information from the same custom service, using the URL: http://localhost:8080/slamonitor-monitor/monitor/responseTimes?operation=submitOrder


Caution

If no query parameter is provided, then response times for all operations will be returned.