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Smarter cache expiry based on age

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This commit is contained in:
Nathan Gray 2014-07-28 22:07:47 +00:00
parent 73c1f064b9
commit 2fe7b34081
1 changed files with 35 additions and 8 deletions
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43
phpgwapi/js/jsapi/egw_data.js
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@ -52,11 +52,11 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
/**
* Looks like too much data is cached. Forget some.
*
* Tries to free up localStorage by removing cached data for the given
* prefix, but if none is found it will remove all cached data.
* Tries to free up localStorage by removing the oldest cached data for the
* given prefix, but if none is found it will look at all cached data.
*
* @param {string} _prefix UID / application prefix
* @returns {Number} Number of cached recordsets removed
* @returns {Number} Number of cached recordsets removed, normally 1.
*/
function _clearCache(_prefix)
{
@ -66,8 +66,21 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
{
if(window.localStorage.key(i).indexOf('cache_'+_prefix) == 0)
{
indexes.push(i);
window.localStorage.removeItem(window.localStorage.key(i));
var key = window.localStorage.key(i);
var cached = JSON.parse(window.localStorage.getItem(key));
if(cached.lastModification)
{
indexes.push({
key: key,
lastModification: cached.lastModification
});
}
else
{
// No way to know how old it is, just remove it
window.localStorage.removeItem(key);
}
}
}
// Nothing for that prefix? Clear all cached data.
@ -75,6 +88,17 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
{
return _clearCache('');
}
// Found some cached for that prefix, only remove the oldest
else if (indexes.length > 0)
{
indexes.sort(function(a,b) {
if(a.lastModification < b.lastModification) return 1;
if(a.lastModification > b.lastModification) return -1;
return 0;
})
window.localStorage.removeItem(indexes.pop().key);
return 1;
}
return indexes.length;
}
@ -153,15 +177,18 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
}
catch (e)
{
egw.debug('warning', 'Tried to cache some data', cache_key, e);
// Maybe ran out of space? Free some up...
// Maybe ran out of space? Free some up.
if(e.name == 'QuotaExceededError' // storage quota is exceeded, remove cached data
|| 'NS_ERROR_DOM_QUOTA_REACHED') // FF-name
{
var count = _clearCache(_context.prefix);
egw.debug('info', 'localStorage full, removed ' + count + ' stored datasets');
}
// No, something worse happened
else
{
egw.debug('warning', 'Tried to cache some data. It did not work.', cache_key, e);
}
}
}
}