Make TemplateMaps to emit messages when adding/updating/deleting templates

lib/cartodb/template_maps.js

@@ -3,6 +3,11 @@ var crypto  = require('crypto'),
     _       = require('underscore'),
     dot     = require('dot');
 
+
+var EventEmitter = require('events').EventEmitter;
+var util = require('util');
+
+
 // Class handling map templates
 //
 // See http://github.com/CartoDB/Windshaft-cartodb/wiki/Template-maps
@@ -16,6 +21,10 @@ var crypto  = require('crypto'),
 //
 // 
 function TemplateMaps(redis_pool, opts) {
+  if (!(this instanceof TemplateMaps)) return new TemplateMaps();
+
+  EventEmitter.call(this);
+
   this.redis_pool = redis_pool;
   this.opts = opts || {};
 
@@ -42,6 +51,11 @@ function TemplateMaps(redis_pool, opts) {
   this.lock_ttl = this.opts['lock_ttl'] || 5000;
 }
 
+util.inherits(TemplateMaps, EventEmitter);
+
+module.exports = TemplateMaps;
+
+
 var o = TemplateMaps.prototype;
 
 //--------------- PRIVATE METHODS --------------------------------
@@ -193,6 +207,10 @@ o.addTemplate = function(owner, template, callback) {
             return true;
         },
         function finish(err) {
+            if (!err) {
+                self.emit('add', owner, templateName, template);
+            }
+
             callback(err, templateName, template);
         }
   );
@@ -223,6 +241,10 @@ o.delTemplate = function(owner, tpl_id, callback) {
             return true;
         },
         function finish(err) {
+            if (!err) {
+                self.emit('delete', owner, tpl_id);
+            }
+
             callback(err);
         }
     );
@@ -286,6 +308,10 @@ o.updTemplate = function(owner, tpl_id, template, callback) {
             return true;
         },
         function finish(err) {
+            if (!err) {
+                self.emit('update', owner, templateName, template);
+            }
+
             callback(err, template);
         }
     );
@@ -438,5 +464,3 @@ o.fingerPrint = function(template) {
     .digest('hex')
   ;
 };
-
-module.exports = TemplateMaps;