107 lines
2.7 KiB
JavaScript
107 lines
2.7 KiB
JavaScript
/**
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* Specialized class for conducting an HTTP poll, while properly preventing multiple calls.
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*/
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angular.module('quay-config').factory('AngularPollChannel',
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['ApiService', '$timeout', 'DocumentVisibilityService', 'CORE_EVENT', '$rootScope',
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function(ApiService, $timeout, DocumentVisibilityService, CORE_EVENT, $rootScope) {
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var _PollChannel = function(scope, requester, opt_sleeptime) {
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this.scope_ = scope;
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this.requester_ = requester;
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this.sleeptime_ = opt_sleeptime || (60 * 1000 /* 60s */);
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this.timer_ = null;
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this.working = false;
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this.polling = false;
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this.skipping = false;
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var that = this;
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var visibilityHandler = $rootScope.$on(CORE_EVENT.DOC_VISIBILITY_CHANGE, function() {
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// If the poll channel was skipping because the visibility was hidden, call it immediately.
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if (that.skipping && !DocumentVisibilityService.isHidden()) {
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that.call_();
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}
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});
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scope.$on('$destroy', function() {
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that.stop();
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visibilityHandler();
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});
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};
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_PollChannel.prototype.setSleepTime = function(sleepTime) {
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this.sleeptime_ = sleepTime;
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this.stop();
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this.start(true);
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};
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_PollChannel.prototype.stop = function() {
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if (this.timer_) {
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$timeout.cancel(this.timer_);
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this.timer_ = null;
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this.polling = false;
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}
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this.skipping = false;
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this.working = false;
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};
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_PollChannel.prototype.start = function(opt_skipFirstCall) {
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// Make sure we invoke call outside the normal digest cycle, since
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// we'll call $scope.$apply ourselves.
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var that = this;
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setTimeout(function() {
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if (opt_skipFirstCall) {
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that.setupTimer_();
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return;
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}
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that.call_();
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}, 0);
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};
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_PollChannel.prototype.call_ = function() {
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if (this.working) { return; }
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// If the document is currently hidden, skip the call.
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if (DocumentVisibilityService.isHidden()) {
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this.skipping = true;
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this.setupTimer_();
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return;
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}
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var that = this;
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this.working = true;
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$timeout(function() {
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that.requester_(function(status) {
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if (status) {
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that.working = false;
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that.skipping = false;
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that.setupTimer_();
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} else {
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that.stop();
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}
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});
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}, 0);
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};
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_PollChannel.prototype.setupTimer_ = function() {
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if (this.timer_) { return; }
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var that = this;
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this.polling = true;
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this.timer_ = $timeout(function() {
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that.timer_ = null;
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that.call_();
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}, this.sleeptime_)
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};
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var service = {
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'create': function(scope, requester, opt_sleeptime) {
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return new _PollChannel(scope, requester, opt_sleeptime);
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}
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};
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return service;
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}]);
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