iot-sol/node_modules/hope-message/impl_broker_clients/events.js

Intel(r) IoT Services Orchestration Layer - HTML5 IDE + Node.js middleware to create and host distributed IoT Apps in minutes

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var B = require("hope-base");
var BrokerClient = require("../lib/broker_client");
var AbstractBrokerClient = BrokerClient.AbstractBrokerClient;
var EventEmitter = require("eventemitter3");


// this is used for subscrib_all
var _all_emitter_ = new EventEmitter();

function EventsBrokerClient(mnode, config) {
  AbstractBrokerClient.call(this, mnode, config);
}

B.type.inherit(EventsBrokerClient, AbstractBrokerClient);



EventsBrokerClient.create$ = function(mnode, config) {
  var bc = new EventsBrokerClient(mnode, config);
  return Promise.resolve(bc);
};

EventsBrokerClient.prototype.dispose$ = function() {
  return Promise.resolve();
};


// invoke this.mnode.on_message_for_accept when msg is received
EventsBrokerClient.prototype.accept$ = function(topic) {
  return Promise.resolve();
};

EventsBrokerClient.prototype.unaccept$ = function(topic) {
  return Promise.resolve();
};

EventsBrokerClient.prototype.send$ = function(mnode_id, topic, msg) {
  var m = this.mnode.get_mnode_in_this_process(mnode_id);
  var self = this;
  return new Promise(function(resolve, reject) {
    if (m) {
      m.on_message_for_accept(msg, self);
      resolve();
    } else {
      reject("message/broker_client/events: Send to a mnode_id not in same process: " + mnode_id);      
    }
  });
};

// invoke this.mnode.on_message_for_subscribe when msg is received
EventsBrokerClient.prototype.subscribe$ = function(mnode_id, topic) {
  var m = this.mnode.get_mnode_in_this_process(mnode_id);
  var self = this;
  return new Promise(function(resolve, reject) {
    if (m) {
      m.events_broker.on(topic, self.handler_for_message_of_subscribe);
      resolve();
    } else {
      reject("message/broker_client/events: Subscribe to a mnode_id not in same process: " + mnode_id);      
    }
  });  
};

EventsBrokerClient.prototype.unsubscribe$ = function(mnode_id, topic) {
  var m = this.mnode.get_mnode_in_this_process(mnode_id);
  var self = this;
  return new Promise(function(resolve, reject) {
    if (m) {
      m.events_broker.removeListener(topic, self.handler_for_message_of_subscribe);
      resolve();
    } else {
      reject("message/broker_client/events: Unsubscribe to a mnode_id not in same process: " + mnode_id);      
    }
  });  
};

// invoke this.mnode.on_message_for_subscribe_all when msg is received
EventsBrokerClient.prototype.subscribe_all$ = function(topic) {
  _all_emitter_.on(topic, this.handler_for_message_of_subscribe_all);
  return Promise.resolve();
};


EventsBrokerClient.prototype.unsubscribe_all$ = function(topic) {
  _all_emitter_.removeListener(topic, this.handler_for_message_of_subscribe_all);
  return Promise.resolve();
};



EventsBrokerClient.prototype.publish$ = function(topic, data) {
  var self = this;
  return new Promise(function(resolve) {
    B.later(function() {
      self.mnode.events_broker.emit(topic, data);
      _all_emitter_.emit(topic, data);
      resolve();
    });
  });
};


module.exports = EventsBrokerClient;