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.


        //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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import java.util.Calendar;


public class TopicManagerAdminService {


    public TopicNode getAllTopics() throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return eventBroker.getTopicManager().getTopicTree();
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error in accessing topic manager ", e);
        }
    }

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            throw new EventAdminException("Error in accessing topic manager ", e);
        }
    }


    public TopicRolePermission[] getTopicRolePermissions(String topic) throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return eventBroker.getTopicManager().getTopicRolePermission(topic);
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }

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            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }


    public void addTopic(String topic) throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            eventBroker.getTopicManager().addTopic(topic);
        } catch (EventBrokerException e) {
            throw new EventAdminException(e.getMessage());
        }
    }

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        }
    }


    public void updatePermission(String topic, TopicRolePermission[] topicRolePermissions)
            throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            eventBroker.getTopicManager().updatePermissions(topic, topicRolePermissions);
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error: " + e.getMessage());
        }
    }

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    }


    public Subscription[] getAllWSSubscriptionsForTopic(String topic, int startingIndex,
                                                        int maxSubscriptionCount)
            throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            TopicManager topicManager = eventBroker.getTopicManager();
            org.wso2.carbon.event.core.subscription.Subscription[] subscriptions =
                    topicManager.getSubscriptions(topic, true);


            int resultSetSize = maxSubscriptionCount;
            if ((subscriptions.length - startingIndex) < maxSubscriptionCount) {

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            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }


    public Subscription[] getWsSubscriptionsForTopic(String topic) throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return adaptSubscriptions(eventBroker.getTopicManager().getSubscriptions(topic, true));
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }

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            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }


    public int getAllWSSubscriptionCountForTopic(String topic) throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return eventBroker.getTopicManager().getSubscriptions(topic, true).length;
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error in accessing topic manager", e);
        }
    }

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        }
        return adminSubscriptions;
    }


    public String[] getUserRoles() throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return eventBroker.getTopicManager().getBackendRoles();
        } catch (EventBrokerException e) {
            throw new EventAdminException("Error in getting User Roles from topic manager", e);
        }
    }

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            throw new EventAdminException("Error in getting User Roles from topic manager", e);
        }
    }


    public boolean removeTopic(String topic) throws EventAdminException {
        EventBroker eventBroker = EventAdminHolder.getInstance().getEventBroker();
        try {
            return eventBroker.getTopicManager().removeTopic(topic);
        } catch (EventBrokerException e) {
            throw new EventAdminException(e.getMessage());
        }
    }

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