Added initial cache service for groups, hosts, applications and

items caching on client side.

plugins/datasource-zabbix/zabbixCacheSrv.js

@@ -0,0 +1,59 @@
+define([
+  'angular',
+  'lodash'
+  ],
+function (angular, _) {
+  'use strict';
+
+  var module = angular.module('grafana.services');
+
+  module.factory('ZabbixCache', function($q, backendSrv) {
+
+    function ZabbixCache(zabbixAPI, lifetime) {
+      var self = this;
+      this.zabbixAPI = zabbixAPI;
+      this.lifetime = lifetime;
+
+      var promises = [
+        this.zabbixAPI.getGroups(),
+        this.zabbixAPI.getHosts(),
+        this.zabbixAPI.getApplications(),
+        this.zabbixAPI.getItems()
+      ];
+
+      $q.all(promises).then(function (results) {
+        console.log(results);
+        if (results.length) {
+          self._groups = results[0];
+          self._hosts = results[1];
+          self._applications = groupApplications(results[2]);
+          self._items = results[3];
+        }
+      });
+    }
+
+    var p = ZabbixCache.prototype;
+
+    p.getHosts = function() {
+      return this._hosts;
+    };
+
+    /**
+     * Group Zabbix applications by name
+     * @param  {[type]} applications [description]
+     * @return {[type]}              [description]
+     */
+    function groupApplications(applications) {
+      return _.map(_.groupBy(applications, 'name'), function (value, key) {
+        return {
+          name: key,
+          ids: _.map(value, 'applicationid')
+        };
+      });
+    }
+
+    return ZabbixCache;
+
+  });
+
+});