private static void EnforceMaximumCacheSize()
{
// remove cache entries if the total cache size is above
// MaximumCacheSize
int sum = 0;
var keys = new List <string>();
foreach (var pair in PreviousRender)
{
sum += pair.Value.Length;
keys.Add(pair.Key);
}
Debug.WriteLine(string.Format("Memory footprint: {0} bytes in {1} items.", sum, keys.Count));
if (sum <= MaximumCacheSize)
{
return;
}
int keyNr = keys.Count * sum / MaximumCacheSize;
for (int c = 0; c < keyNr; c++)
{
PreviousRender.Remove(keys[c]);
PreviousRenderTime.Remove(keys[c]);
}
}
// ReSharper disable UnusedParameter.Local
private static void ProcessCommand(HttpContext context, CommandEventArgs cea)
// ReSharper restore UnusedParameter.Local
{
switch (cea.CommandName)
{
case "ClearUploadPanelCache":
{
PreviousRender.Remove((string)cea.CommandArgument);
}
break;
}
}
/// <summary>
/// clear the cached output of child update panels
/// </summary>
/// <param name="id"></param>
private void ClearChildren(string id)
{
foreach (var pair in PanelTree)
{
if (pair.Value != id)
{
continue;
}
PreviousRender.Remove(Key + ":" + pair.Key);
PreviousRenderTime.Remove(Key + ":" + pair.Key);
ClearChildren(pair.Key);
}
}
private static void EnforceMaximumCacheTime()
{
var keys = new List <string>();
foreach (var pair in PreviousRender)
{
DateTime dt;
if (!PreviousRenderTime.TryGetValue(pair.Key, out dt))
{
continue;
}
if ((DateTime.Now - dt).TotalMilliseconds > MaximumCacheTime)
{
keys.Add(pair.Key);
}
}
foreach (var key in keys)
{
PreviousRender.Remove(key);
PreviousRenderTime.Remove(key);
}
}
private void InitFilter()
{
var session = HttpContext.Current.Session;
if (session != null)
{
if (session.IsNewSession)
{
session["InitializeSession"] = "Something";
}
_sessionID = session.SessionID;
}
ScriptManager sm = ScriptManager.GetCurrent(Page);
if (sm != null)
{
if (!sm.IsInAsyncPostBack)
{
if (_sessionID != null)
{
var keysToRemove = PreviousRender.Keys.Where(key => key.StartsWith(_sessionID + ":")).ToList();
foreach (string key in keysToRemove)
{
PreviousRender.Remove(key);
PreviousRenderTime.Remove(key);
}
EnsureKey();
}
}
else
{
BuildPanelTree();
}
LoadApplyPatch();
}
ProcessCache();
}
/// <summary>
/// try to shrink the update panel output
/// </summary>
/// <param name="id"></param>
/// <param name="content"></param>
/// <returns></returns>
private string Shrink(string id, string content)
{
string keyId = Key + ":" + id;
string prev;
// if the updatepanel content is not cached, cache it and send it
bool hasPrevious = PreviousRender.TryGetValue(keyId, out prev);
PreviousRender[keyId] = content;
PreviousRenderTime[keyId] = DateTime.Now;
if (hasPrevious)
{
// Generate the diff patch
content = GeneratePatch(content, prev);
}
/*// send it through a javascript rather than an updatePanel innerHtml replacement
* string s =
* string.Format(
* "var elem=document.getElementById('{1}'); if (elem) {{ var patch='{0}';ApplyPatch(elem,patch); }}",
* JSUtil.fixString(content), id);
* s = s.Length + "|scriptBlock|ScriptContentNoTags|" + s + "|";
* return s;*/
return(string.Format("{0}|updatePanel|{1}|{2}|", content.Length, id, content));
}
