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Merge pull request #952 from eidyia/pr-guidCacheHWMbug

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Eliminate CPU churning on cache highwater check
This commit is contained in:
Jon Atkins 2015-03-07 16:38:54 +00:00
commit dd9f053ed3
1 changed files with 4 additions and 1 deletions
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code/portal_data.js
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@ -93,6 +93,7 @@ window.findPortalLatLng = function(guid) {
(function() {
var cache = {};
var cache_level = 0;
var GC_LIMIT = 5000; // run garbage collector when cache has more that 5000 items
var GC_KEEP = 4000; // keep the 4000 most recent items
@ -128,13 +129,15 @@ window.findPortalLatLng = function(guid) {
window.pushPortalGuidPositionCache = function(guid, latE6, lngE6) {
cache[latE6+","+lngE6] = [guid, Date.now()];
cache_level += 1;
if(Object.keys(cache).length > GC_LIMIT) {
if(cache_level > GC_LIMIT) {
Object.keys(cache) // get all latlngs
.map(function(latlng) { return [latlng, cache[latlng][1]]; }) // map them to [latlng, timestamp]
.sort(function(a,b) { return b[1] - a[1]; }) // sort them
.slice(GC_KEEP) // drop the MRU
.forEach(function(item) { delete cache[item[0]] }); // delete the rest
cache_level = Object.keys(cache).length
}
}
})();