topo2Event.js
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/*
* Copyright 2016-present Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
ONOS GUI -- Topology Event Module.
Defines the conduit between the client and the server:
- provides a clean API for sending events to the server
- dispatches incoming events from the server to the appropriate sub-module
*/
(function () {
'use strict';
// injected refs
var $log, wss, t2fs;
// internal state
var handlerMap,
openListener;
// TODO: only add heartbeat timer etc. if we really need to be doing that..
// ========================== Helper Functions
function createHandlerMap() {
handlerMap = {
topo2AllInstances: t2fs,
topo2CurrentLayout: t2fs,
topo2CurrentRegion: t2fs,
topo2PeerRegions: t2fs,
topo2StartDone: t2fs
// Add further event names / module references as needed
};
}
function wsOpen(host, url) {
$log.debug('topo2Event: WSopen - cluster node:', host, 'URL:', url);
// tell the server we are ready to receive topo events
wss.sendEvent('topo2Start');
}
// bind our event handlers to the web socket service, so that our
// callbacks get invoked for incoming events
function bindHandlers() {
wss.bindHandlers(handlerMap);
$log.debug('topo2 event handlers bound');
}
// tell the server we are ready to receive topology events
function start() {
// in case we fail over to a new server,
// listen for wsock-open events
openListener = wss.addOpenListener(wsOpen);
wss.sendEvent('topo2Start');
$log.debug('topo2 comms started');
}
// tell the server we no longer wish to receive topology events
function stop() {
wss.sendEvent('topo2Stop');
wss.unbindHandlers(handlerMap);
wss.removeOpenListener(openListener);
openListener = null;
$log.debug('topo2 comms stopped');
}
// ========================== Main Service Definition
angular.module('ovTopo2')
.factory('Topo2EventService',
['$log', 'WebSocketService', 'Topo2ForceService',
function (_$log_, _wss_, _t2fs_) {
$log = _$log_;
wss = _wss_;
t2fs = _t2fs_;
// deferred creation of handler map, so module references are good
createHandlerMap();
return {
bindHandlers: bindHandlers,
start: start,
stop: stop
};
}]);
})();