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tweaks to the map data cache, in preperation for detail level specific expiry times

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Jon Atkins
2013-10-17 01:32:28 +01:00
parent 4883eb5a4e
commit fefff1c0fc
1 changed files with 9 additions and 5 deletions
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14
code/map_data_cache.js
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@ -26,15 +26,19 @@ window.DataCache = function() {
} }
window.DataCache.prototype.store = function(qk,data,date) { window.DataCache.prototype.store = function(qk,data,freshTime) {
// fixme? common behaviour for objects is that properties are kept in the order they're added // fixme? common behaviour for objects is that properties are kept in the order they're added
// this is handy, as it allows easy retrieval of the oldest entries for expiring // this is handy, as it allows easy retrieval of the oldest entries for expiring
// however, this is not guaranteed by the standards, but all our supported browsers work this way // however, this is not guaranteed by the standards, but all our supported browsers work this way
delete this._cache[qk]; delete this._cache[qk];
if (date === undefined) date = new Date(); var time = new Date().getTime();
this._cache[qk] = { time: date.getTime(), data: data };
if (freshTime===undefined) freshTime = this.REQUEST_CACHE_FRESH_AGE*1000;
var expire = time + freshTime;
this._cache[qk] = { time: time, expire: expire data: data };
} }
window.DataCache.prototype.get = function(qk) { window.DataCache.prototype.get = function(qk) {
@ -50,8 +54,8 @@ window.DataCache.prototype.getTime = function(qk) {
window.DataCache.prototype.isFresh = function(qk) { window.DataCache.prototype.isFresh = function(qk) {
if (qk in this._cache) { if (qk in this._cache) {
var d = new Date(); var d = new Date();
var t = d.getTime() - this.REQUEST_CACHE_FRESH_AGE*1000; var t = d.getTime();
if (this._cache[qk].time >= t) return true; if (this._cache[qk].expire >= t) return true;
else return false; else return false;
} }