/**
   * Overridden method for rest json message sending.
   *
   * @param publisherEvent Published event name
   * @throws NotificationManagementException
   */
  @Override
  public void sendMessage(PublisherEvent publisherEvent) throws NotificationManagementException {
    // Publisher event will not be null since it is handled by the mgt component.
    // Read the relevant subscription from configurations.
    JsonSubscription jsonSubscription = subscriptionMap.get(publisherEvent.getEventName());
    // New list for aggregated set of endpoints. ie configured and dynamic
    List<JsonEndpointInfo> endpoints;

    if (jsonSubscription != null) {
      endpoints = jsonSubscription.getEndpointInfoList();
      HttpClient client = new DefaultHttpClient();
      // Get all configured endpoints for message sending
      // Send messages to each endpoint in endpoints list
      for (JsonEndpointInfo endpoint : endpoints) {
        HttpPost post = new HttpPost(endpoint.getEndpoint());
        HttpResponse response = null;
        StringEntity entity;

        post.setHeader(
            JsonModuleConstants.CONTENT_TYPE_LABEL, JsonModuleConstants.CONTENT_TYPE_JSON_LABEL);

        // Adding basic authentication header to post. If required information are not found,
        // building subscription will fail at the time of configuration building
        if (endpoint.isAuthenticationRequired()) {
          if (log.isDebugEnabled()) {
            log.debug("Setting authentication information on request to " + endpoint.getEndpoint());
          }
          post.setHeader(
              JsonModuleConstants.AUTHORIZATION_HEADER,
              getBase64EncodedBasicAuthHeader(
                  endpoint.getUsername(), String.valueOf(endpoint.getPassword())));
        } else {
          if (log.isDebugEnabled()) {
            log.debug("No authentication required to endpoint " + endpoint.getEndpoint());
          }
        }

        // Read JSON content from endpoint configurations. If not present,
        // get content form event configurations.
        String jsonContent = endpoint.getJsonConfigString();
        if (StringUtils.isEmpty(jsonContent)) {
          jsonContent = jsonSubscription.getJsonContent();
        }
        if (StringUtils.isEmpty(jsonContent)) {
          log.error(
              "No content template found either for event or endpoint "
                  + endpoint.getEndpoint()
                  + " on event "
                  + publisherEvent.getEventName()
                  + ", message sending aborted");
          continue;
        }
        String jsonMessage =
            getJSONData(
                jsonContent,
                jsonSubscription.getSubscriptionProperties(),
                endpoint.getEndpointsParams(),
                publisherEvent.getEventProperties());
        try {
          entity = new StringEntity(jsonMessage);
          post.setEntity(entity);
          response = client.execute(post);
          log.info(
              "Notification message has been posted to "
                  + endpoint.getEndpoint()
                  + " on event "
                  + publisherEvent.getEventName());
          if (log.isDebugEnabled() && response != null) {
            log.debug(
                "Response of HTTP post is "
                    + response.getStatusLine()
                    + "on post operation to "
                    + "endpoint "
                    + endpoint.getEndpoint()
                    + " on event "
                    + publisherEvent.getEventName());
          }
        } catch (UnsupportedEncodingException e) {
          log.error(
              "Error while creating StringEntry from given JSON string on event "
                  + publisherEvent.getEventName()
                  + "to endpoint "
                  + endpoint.getEndpoint()
                  + " JSON string : "
                  + jsonMessage,
              e);

        } catch (ClientProtocolException e) {
          log.error(
              "Error in HTTP protocol, error while executing POST operation to endpoint "
                  + endpoint.getEndpoint()
                  + "on event "
                  + publisherEvent.getEventName(),
              e);

        } catch (IOException e) {
          log.error(
              "Error while executing POST operation to endpoint "
                  + endpoint.getEndpoint()
                  + "on "
                  + "event "
                  + publisherEvent.getEventName(),
              e);

        } finally {
          // Finally closing connections.
          post.abort();
        }
      }
    }
  }
  /**
   * Whether a particular type of event is subscribed by this module or not
   *
   * @return Whether this module is subscribed or not
   */
  @Override
  public boolean isSubscribed(PublisherEvent publisherEvent)
      throws NotificationManagementException {

    return publisherEvent != null && subscriptionMap.containsKey(publisherEvent.getEventName());
  }