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Backport commit r48009, committed by Nathan Gray.

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Data improvements:
- pass UID as additional parameter to data callbacks
- cache actual data separately from cached fetch response to avoid duplication
- use callbacks to keep localStorage data consistent with data in memory
- use callback to update cached fetch response if a record is removed (set to null)
This commit is contained in:
Hadi Nategh 2014-08-11 13:56:29 +00:00
parent e40065917b
commit 6ff6db42e6
1 changed files with 70 additions and 7 deletions
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75
phpgwapi/js/jsapi/egw_data.js
View File

@ -35,6 +35,12 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
*/
var CACHE_LIFETIME = 29; // seconds
/**
* Cached fetches are differentiated from actual results by using this prefix
* @type String
*/
var CACHE_KEY_PREFIX = 'cached_fetch_';
var lastModification = null;
/**
@ -74,10 +80,12 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
// Find cached items for the prefix, we prefer to expire just within the app
var indexes = [];
for(var i = 0; i < window.localStorage.length; i++)
{
if(window.localStorage.key(i).indexOf('cache_'+_prefix) == 0)
{
var key = window.localStorage.key(i);
// This is a cached fetch for many rows
if(key.indexOf(CACHE_KEY_PREFIX+_prefix) == 0)
{
var cached = JSON.parse(window.localStorage.getItem(key));
if(cached.lastModification)
@ -93,6 +101,23 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
window.localStorage.removeItem(key);
}
}
// Actual cached data
else if (key.indexOf(_prefix) == 0)
{
var cached = JSON.parse(window.localStorage.getItem(key));
if(cached.timestamp)
{
indexes.push({
key: key,
lastModification: cached.timestamp
});
}
else
{
// No way to know how old it is, just remove it
window.localStorage.removeItem(key);
}
}
}
// Nothing for that prefix? Clear all cached data.
if(_prefix && indexes.length == 0)
@ -181,9 +206,37 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
var cache_key = false
if(cache_key = cc.callback.call(cc.context, _context))
{
cache_key = 'cache_' + _context.prefix + '::' + cache_key;
cache_key = CACHE_KEY_PREFIX + _context.prefix + '::' + cache_key;
try
{
for (var key in _result.data)
{
var uid = UID(key, (typeof _context == "object" && _context != null) ? _context.prefix : "");
// Register a handler on each data so we can know if it is updated or removed
egw.dataUnregisterUID(uid, null, cache_key);
egw.dataRegisterUID(uid, function(data, _uid) {
// If data item is removed, remove it from cached fetch too
if(data == null)
{
var cached = JSON.parse(window.localStorage[this]) || false;
if(cached && cached.order && cached.order.indexOf(_uid) >= 0)
{
cached.order.splice(cached.order.indexOf(_uid),1);
if(cached.total) cached.total--;
window.localStorage[this] = JSON.stringify(cached);
}
window.localStorage.removeItem(_uid);
}
else
{
// Update or store data in long-term storage
window.localStorage[_uid] = JSON.stringify({timestamp: (new Date).getTime(), data: data});
}
},cache_key);
}
// Don't keep data in long-term cache with request also
_result.data = {};
window.localStorage.setItem(cache_key,JSON.stringify(_result));
}
catch (e)
@ -324,7 +377,7 @@ egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
var cache_key = false
if(cache_key = cc.callback.call(cc.context, _context))
{
cache_key = 'cache_' + _context.prefix + '::' + cache_key;
cache_key = CACHE_KEY_PREFIX + _context.prefix + '::' + cache_key;
var cached = window.localStorage.getItem(cache_key);
if(cached)
@ -509,6 +562,9 @@ egw.extend("data_storage", egw.MODULE_GLOBAL, function (_app, _wnd) {
// Delete the data from the localStorage
delete localStorage[uid];
// We don't clean long-term storage because of age until it runs
// out of space
}
}
}, CLEANUP_INTERVAL);
@ -551,7 +607,13 @@ egw.extend("data_storage", egw.MODULE_GLOBAL, function (_app, _wnd) {
{
// Update the timestamp and call the given callback function
localStorage[_uid].timestamp = (new Date).getTime();
_callback.call(_context, localStorage[_uid].data);
_callback.call(_context, localStorage[_uid].data, _uid);
}
// Check long-term storage
else if(window.localStorage && window.localStorage[_uid])
{
localStorage[_uid] = JSON.parse(window.localStorage[_uid]);
_callback.call(_context, localStorage[_uid].data, _uid);
}
else if (_execId && _widgetId)
{
@ -694,7 +756,8 @@ egw.extend("data_storage", egw.MODULE_GLOBAL, function (_app, _wnd) {
try {
registeredCallbacks[_uid][i].callback.call(
registeredCallbacks[_uid][i].context,
_data
_data,
_uid
);
} catch (e) {
// Remove this callback from the list