Examples of org.wso2.carbon.event.core.EventBroker

org.wso2.carbon.event.core.EventBroker
the main eventing interface for the other components. this interface supports two kinds of subscriptions. 1. subscritions with EventDispatcher Event broker does not persists these subscriptions and call the on message method upon receiving an event. 2. subscriptions with EventDispatcherName Event broker persists these subscriptions. It is responsibility of the user who calls this method to register the eventDispatcher with the given name. In a server restart again caller has to register the Event dispatcher.

    }


    public byte[] getProcessImage(String processId) {


        QName qName = decode(processId);
        SVGInterface svg = createSVG(qName);
        return svg.toPNGBytes();
    }

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    private SVGInterface createSVG(QName qName) {


        // generate new
        InputStream in = getBpelDescriptor(qName);


        SVGInterface svg = null;


        try {
            svg = BPEL2SVGUtil.generate(in);


            if (svg == null)

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    protected static SVGImpl generateSVGImpl(java.io.InputStream is) throws java.io.IOException {
      byte[] b=new byte[is.available()];
      is.read(b);
    
      BPELInterface bpel = new BPELImpl();
        OMElement bpelStr = bpel.load(new String(b));
        
        bpel.processBpelString(bpelStr);


        LayoutManager layoutManager = BPEL2SVGFactory.getInstance().getLayoutManager();
        layoutManager.setVerticalLayout(true);
        layoutManager.setYSpacing(20);
        layoutManager.setYSpacing(50);
        layoutManager.layoutSVG(bpel.getRootActivity());


        SVGImpl svg = new SVGImpl();
        svg.setRootActivity(bpel.getRootActivity());
        
        return(svg);
    }

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   * @param transformer The optional image transformer
   * @throws java.io.IOException Failed to generate the representation
   */
    public static void generate(java.io.InputStream is, java.io.OutputStream os,
                SVGImageTransformer transformer) throws java.io.IOException {
        SVGImpl svg = generateSVGImpl(is);
        
        if (transformer == null) {
          String str=svg.getHeaders()+svg.generateSVGString();
          os.write(str.getBytes());
        } else {
          transformer.transform(svg, os);
        }
    }

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        layoutManager.setVerticalLayout(true);
        layoutManager.setYSpacing(20);
        layoutManager.setYSpacing(50);
        layoutManager.layoutSVG(bpel.getRootActivity());


        SVGImpl svg = new SVGImpl();
        svg.setRootActivity(bpel.getRootActivity());
        
        return(svg);
    }

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//
//            ActivityEvent<MessageContext> event = null;
//            event = new ActivityThresholdEvent<MessageContext>(eventMsgCtx);
//            ((ActivityThresholdEvent<MessageContext>) event).setResourcePath(ActivityPublisherConstants.BAM_REG_PATH);
//            EventBrokerService<MessageContext> ebs = PublisherUtils.getEventBrokerService();
            EventBroker eb = PublisherUtils.getEventBroker();
            Message message = new Message();
            message.setMessage(eventBody);


            try {
                SuperTenantCarbonContext.startTenantFlow();
                int tenantId = SuperTenantCarbonContext.getCurrentContext(PublisherUtils.getConfigurationContext()).getTenantId();
                SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
                SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);


                eb.publish(message, ActivityPublisherConstants.BAM_REG_PATH);


            } catch (EventBrokerException e) {
                log.error("Can not publish the message ", e);
            } finally {
                SuperTenantCarbonContext.endTenantFlow();

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//
//        // Create a new event and publish to the event broker service
//        ActivityThresholdEvent<MessageContext> event = new ActivityThresholdEvent<MessageContext>(eventMsgCtx);
//        event.setResourcePath(ActivityPublisherConstants.BAM_REG_PATH);


        EventBroker eb = ActivityPublisherUtils.getEventBroker();
        Message message = new Message();
        message.setMessage(eventElement);


        try {
            SuperTenantCarbonContext.startTenantFlow();
            int tenantId = SuperTenantCarbonContext.getCurrentContext(ActivityPublisherUtils.getConfigurationContextService().getServerConfigContext()).getTenantId();
            SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
            SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);


            eb.publish(message, ActivityPublisherConstants.BAM_REG_PATH);


        } catch (EventBrokerException e) {
            log.error("Can not publish the message ", e);
        } finally {
            SuperTenantCarbonContext.endTenantFlow();

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public class EventPublisher implements ServiceStatsProcessor {


    private static Log log = LogFactory.getLog(EventPublisher.class);


    public void process(StatisticData[] statisticData) {
        EventBroker broker = StatisticsServiceComponent.getEventBroker();
        Message message = new Message();


        OMElement eventPayLoad = null;
        for (StatisticData statistic : statisticData) {
            eventPayLoad = constructEventPayLoad(statistic);
            message.setMessage(eventPayLoad);
            try {
                SuperTenantCarbonContext.startTenantFlow();
                int tenantId = SuperTenantCarbonContext.getCurrentContext(StatisticsServiceComponent.getConfigurationContext()).getTenantId();
                SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
                SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);


                broker.publishRobust(message, ServiceStatisticsPublisherConstants.BAM_REG_PATH);


            } catch (EventBrokerException e) {
                log.error("Can not publish the message ", e);
            } finally {
                SuperTenantCarbonContext.endTenantFlow();

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        //Add static subscription only if bam url is set
        if (serverURL != null) {
            String serviceURL = serverURL + UsageAgentConstants.BAM_SERVER_STAT_SERVICE;


            EventBroker eventBrokerService = getEventBrokerService();
            Subscription subscription = new Subscription();
            // set the subscription end point to the service url
            subscription.setEventSinkURL(serviceURL);
            subscription.setTopicName(UsageAgentConstants.BAM_SERVER_STAT_FILTER);
            subscription.setOwner(CarbonConstants.REGISTRY_SYSTEM_USERNAME);
            subscription.setEventDispatcherName(EventBrokerConstants.WS_EVENT_DISPATCHER_NAME);


            try {
                eventBrokerService.subscribe(subscription);
            } catch (EventBrokerException e) {
                String msg = "Cannot subscribe to the event broker ";
                log.error(msg);
                throw e;
            }

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            return;
        }


        // get the topic of the event to be published
        String topic = UsageAgentConstants.BANDWIDTH_USAGE_TOPIC;
        EventBroker eventBrokerService = Util.getEventBrokerService();
        // publish the event
        try {
            SuperTenantCarbonContext.startTenantFlow();
            SuperTenantCarbonContext.getCurrentContext().setTenantId(MultitenantConstants.SUPER_TENANT_ID);
            SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);
            eventBrokerService.publish(message, topic);
        } catch (EventBrokerException e) {
            log.error("SystemStatisticsHandler - Unable to send notification for stat threshold", e);
        } finally {
            SuperTenantCarbonContext.endTenantFlow();
        }

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