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.

            if (tenantDomainName == null) {
                ServerConfiguration serverConfiguration = this.serverConfiguration;
                String mediationServerURL = serverConfiguration.getFirstProperty(BAM_SERVER_URL);


                if (mediationServerURL != null) {
                    EventBroker eventBroker = PublisherUtils.getEventBroker();


                    Subscription subscription = new Subscription();
/*
                    EventFilter eventFilter = new EventFilter(null, null); //
                    subscription.setEventFilter(eventFilter);*/


                    subscription.setEventSinkURL(mediationServerURL + MDPublisherConstants.BMA_MEDIATION_STAT_RECEIVER_SERVICE);
                    subscription.setTopicName("carbon/bam/data/publishers/mediation_stats");


/*                    EventFilterDesc eventFilterDesc = new EventFilterDesc();
                    eventFilterDesc.setFilterValue("carbon/bam/data/publishers/mediation_stats");
                    subscription.setFilterDesc(eventFilterDesc);*/
                    try {
                        eventBroker.subscribe(subscription);
                    } catch (Exception e) {
                        throw new AxisFault("Can not subscribe to the event broker ", e);
                    }
                }
            }

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            Message message = new Message();
            message.setMessage(statMessage);


            int tenantId = NO_TENANT_MODE;
            EventBroker broker = PublisherUtils.getEventBroker();
            try {
                SuperTenantCarbonContext.startTenantFlow();


                // This check is for integration tests where no ConfigurationContextService would be present
                if (PublisherUtils.getConfigurationContextService() != null) {
                   tenantId = SuperTenantCarbonContext.getCurrentContext(PublisherUtils.
                        getConfigurationContextService().getServerConfigContext()).getTenantId();
                }


                SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
                SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);


                broker.publish(message, MDPublisherConstants.BAM_REG_PATH);


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

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    private void generateEvent(OMElement statMessage) {
        if (statMessage != null) {
            Message message = new Message();
            message.setMessage(statMessage);


            EventBroker broker = PublisherUtils.getEventBroker();


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


                broker.publish(message, ActivityPublisherConstants.BAM_REG_PATH);


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

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        try {
            // set incarnate this thread to supper tenat since carbon contexes can only be
            // run is supertenants
            SuperTenantCarbonContext.startTenantFlow();
            SuperTenantCarbonContext.getCurrentContext().setTenantId(MultitenantConstants.SUPER_TENANT_ID);
            EventBroker eventBroker = EventBrokerBuilder.createEventBroker();
            this.eventServiceRegistration = context.getBundleContext().registerService(EventBroker.class.getName(),
                                                                   eventBroker, null);
            registerAxis2ConfigurationContextObserver(context);
            log.info("Successfully registered the event broker");
            EventBrokerHolder.getInstance().setEventBroker(eventBroker);

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                    .getTenantDomain() == null) {
                String serverURL = serverConfiguration.getFirstProperty(
                        ServiceStatisticsPublisherConstants.BAM_SERVER_URL);


                if (serverURL != null) {
                    EventBroker broker = eventBroker;


                    Subscription subscription = new Subscription();


                    subscription.setEventSinkURL(serverURL +
                            ServiceStatisticsPublisherConstants.
                                    BAM_SERVICE_STAT_RECEIVER_SERVICE);
                    subscription.setTopicName(ServiceStatisticsPublisherConstants.BAM_REG_PATH);


                    subscription.setOwner(CarbonConstants.REGISTRY_SYSTEM_USERNAME);
                    subscription.setEventDispatcherName(EventBrokerConstants.WS_EVENT_DISPATCHER_NAME);


                    try {
                        SuperTenantCarbonContext.startTenantFlow();
                        int tenantId = SuperTenantCarbonContext.getCurrentContext(StatisticsServiceComponent.getConfigurationContext()).getTenantId();
                        SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
                        SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);
                        SuperTenantCarbonContext.getCurrentContext().setUsername(CarbonConstants.REGISTRY_SYSTEM_USERNAME);
                        SuperTenantCarbonContext.getCurrentContext().setUserRealm(realmService.getBootstrapRealm());


                        broker.subscribe(subscription);


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

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        if (topicValue == null) {
            handleException("Topic for the event cannot be found", synCtx);
        } else {
            org.apache.axis2.context.MessageContext mc =
                    ((Axis2MessageContext)synCtx).getAxis2MessageContext();
            EventBroker broker = (EventBroker) mc.getConfigurationContext().
                    getProperty("mediation.event.broker");
            if (broker == null) {
                handleException("EventBroker cannot be found", synCtx);
            } else {
                Message message = new Message();
                if (expression == null) {
                    message.setMessage(synCtx.getEnvelope().getBody().getFirstElement());
                } else {
                    try {
                        Object o = expression.selectSingleNode(synCtx);
                        if (o instanceof OMElement)  {
                            message.setMessage((OMElement)o);
                        } else {
                            handleException("The result of the expression:" +
                                    expression + " should be an OMElement", synCtx);
                        }
                    } catch (JaxenException e) {
                        handleException("Error evaluating the expression: " +
                                expression, synCtx);
                    }
                }


                int tenantID = SuperTenantCarbonContext.getCurrentContext(
                        mc.getConfigurationContext()).getTenantId();
                try {
                    SuperTenantCarbonContext.startTenantFlow();
                    SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantID);
                    SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);
                    broker.publish(message, topicValue);
                } catch (EventBrokerException e) {
                    handleException("Error publishing the event to the broker", e, synCtx);
                } catch (Exception e) {
                    log.error("Error in setting tenant information", e);
                } finally {

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    public void cleanup() throws DataServiceFault {
        if (log.isDebugEnabled()) {
            log.debug("Data Service '" + this.getName() + "' cleanup start..");
        }
        /* remove event subscriptions */
        EventBroker eventBroker =
                DataServicesDSComponent.getEventBroker();
        if (eventBroker != null) {
            this.clearDataServicesEventSubscriptions(eventBroker);
        }
        /* cleanup configs */

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    public void publish(String topicName,
                        OMElement message,
                        BrokerConfiguration brokerConfiguration)
            throws BrokerEventProcessingException {


        EventBroker eventBroker = BrokerServiceValueHolder.getEventBroker();
        Message eventMessage = new Message();
        eventMessage.setMessage(message);
        try {
            eventBroker.publishRobust(eventMessage, topicName);
        } catch (EventBrokerException e) {
            throw new BrokerEventProcessingException("Can not publish the to local broker ", e);
        }
    }

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     * @param topic     Topic
     * @throws DataServiceFault DataServiceFault
     */
    private void sendMessageToTopic(OMElement omMessage, String topic) throws DataServiceFault {
        try {
            EventBroker eventBroker = DataServicesDSComponent.getEventBroker();
            if (eventBroker == null) {
              throw new DataServiceFault("Event broker instance is not available");
            }
            Message message = new Message();
            message.setMessage(omMessage);
            eventBroker.publish(message, topic);
        } catch (Exception e) {
          throw new DataServiceFault(e, "Error in publishing event for topic: " +
                    topic + " message:-\n" + omMessage);
        }
    }

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    }


    public static void registerEventBrokerServiceListener(
            EventBrokerServiceListener listener) {
        synchronized (dsComponentLock) {
            EventBroker eventBroker = getEventBroker();
            if (eventBroker == null) {
                eventBrokerServiceListeners.add(listener);
            } else {
                listener.setEventBroker(eventBroker);
            }

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