phillip/ingress-intel-total-conversion
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artifact refresh: reduce to once per hour, but synchronise to close to the hour mark to keep the data fresh

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a small random jitter is added to the refresh time to prevent a large number of requests at the exact same time
This commit is contained in:
Jon Atkins 2013-11-13 00:07:58 +00:00
parent 736ccfd5c8
commit 110857cda3
1 changed files with 8 additions and 4 deletions
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12
code/artifact.js
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@ -11,7 +11,8 @@
window.artifact = function() {}
window.artifact.setup = function() {
artifact.REFRESH_SUCCESS = 15*60; // 15 minutes on success
artifact.REFRESH_JITTER = 2*60; // 2 minute random period so not all users refresh at once
artifact.REFRESH_SUCCESS = 60*60; // 60 minutes on success
artifact.REFRESH_FAILURE = 2*60; // 2 minute retry on failure
artifact.idle = false;
@ -46,7 +47,11 @@ window.artifact.idleResume = function() {
window.artifact.handleSuccess = function(data) {
artifact.processData (data);
setTimeout (artifact.requestData, artifact.REFRESH_SUCCESS*1000);
// start the next refresh at a multiple of REFRESH_SUCCESS seconds, plus a random REFRESH_JITTER amount to prevent excessive server hits at one time
var now = Date.now();
var nextTime = Math.ceil(now/(artifact.REFRESH_SUCCESS*1000))*(artifact.REFRESH_SUCCESS*1000) + Math.floor(Math.random()*artifact.REFRESH_JITTER*1000);
setTimeout (artifact.requestData, nextTime - now);
}
window.artifact.handleFailure = function(data) {
@ -58,9 +63,8 @@ window.artifact.handleFailure = function(data) {
window.artifact.processData = function(data) {
if (!data.artifacts) {
if (data.error || !data.artifacts) {
console.warn('Failed to find artifacts in artifact response');
return;
}
artifact.clearData();