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//
// System.Web.Caching.CacheDependency
//
// Authors:
// Patrik Torstensson
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (c) 2003 Ximian, Inc. (http://www.ximian.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Web;
namespace System.Web.Caching
{
internal class CacheDependencyChangedArgs : EventArgs
{
string key;
public CacheDependencyChangedArgs (string key)
{
this.key = key;
}
public string Key {
get { return key; }
}
}
internal delegate void CacheDependencyChangedHandler (object sender, CacheDependencyChangedArgs args);
public sealed class CacheDependency : IDisposable
{
static string [] noStrings = new string [0];
static CacheDependency noDependency = new CacheDependency ();
DateTime start;
bool changed;
bool disposed;
CacheEntry [] entries;
CacheItemRemovedCallback removedDelegate;
FileSystemWatcher [] watchers;
private CacheDependency ()
{
}
public CacheDependency (string filename)
: this (filename, DateTime.MaxValue)
{
}
public CacheDependency (string filename, DateTime start)
: this (new string [] {filename}, null, null, start)
{
}
public CacheDependency (string [] filenames)
: this (filenames, null, null, DateTime.MaxValue)
{
}
public CacheDependency (string [] filenames, DateTime start)
: this (filenames, null, null, start)
{
}
public CacheDependency (string [] filenames, string [] cachekeys)
: this (filenames, cachekeys, null, DateTime.MaxValue)
{
}
public CacheDependency (string [] filenames, string [] cachekeys, DateTime start)
: this (filenames, cachekeys, null, start)
{
}
public CacheDependency (string [] filenames, string [] cachekeys, CacheDependency dependency)
: this (filenames, cachekeys, dependency, DateTime.MaxValue)
{
}
public CacheDependency (string [] filenames,
string [] cachekeys,
CacheDependency dependency,
DateTime start)
{
Cache cache = HttpRuntime.Cache;
this.start = start;
if (filenames == null)
filenames = noStrings;
foreach (string file in filenames) {
if (file == null)
throw new ArgumentNullException ("filenames");
}
if (cachekeys == null)
cachekeys = noStrings;
int missing_keys = 0;
foreach (string ck in cachekeys) {
if (ck == null)
throw new ArgumentNullException ("cachekeys");
if (cache.GetEntry (ck) == null)
missing_keys++;
}
if (dependency == null)
dependency = noDependency;
this.changed = dependency.changed;
if (changed == true)
return;
int nentries = cachekeys.Length + ((dependency.entries == null) ? 0 :
dependency.entries.Length) - missing_keys;
if (nentries != 0) {
this.removedDelegate = new CacheItemRemovedCallback (CacheItemRemoved);
this.entries = new CacheEntry [nentries];
int i = 0;
if (dependency.entries != null) {
foreach (CacheEntry entry in dependency.entries) {
entry._onRemoved += removedDelegate;
entries [i++] = entry;
}
}
for (int c=0; c<cachekeys.Length; c++) {
CacheEntry entry = cache.GetEntry (cachekeys [c]);
if (entry == null)
continue;
entry._onRemoved += removedDelegate;
entries [i++] = entry;
}
}
if (filenames.Length > 0) {
watchers = new FileSystemWatcher [filenames.Length];
for (int i=0; i<filenames.Length; i++)
watchers [i] = CreateWatcher (filenames [i]);
}
}
private FileSystemWatcher CreateWatcher (string file)
{
FileSystemWatcher watcher = new FileSystemWatcher ();
watcher.Path = Path.GetFullPath (Path.GetDirectoryName (file));
watcher.Filter = Path.GetFileName (file);
watcher.Changed += new FileSystemEventHandler (OnFileChanged);
watcher.Created += new FileSystemEventHandler (OnFileChanged);
watcher.Deleted += new FileSystemEventHandler (OnFileChanged);
watcher.EnableRaisingEvents = true;
return watcher;
}
private void OnFileChanged (object sender, FileSystemEventArgs e)
{
OnChanged (sender, e);
}
void CacheItemRemoved (string key, object value, CacheItemRemovedReason reason)
{
OnChanged (this, EventArgs.Empty);
}
void OnChanged (object sender, EventArgs args)
{
if (changed || disposed)
return;
changed = true;
if (Changed != null)
Changed (this, new CacheDependencyChangedArgs (null));
}
public void Dispose ()
{
for (int i=0; i<watchers.Length; i++)
watchers [i].Dispose ();
}
public bool HasChanged
{
get { return changed; }
}
internal CacheEntry [] GetCacheEntries ()
{
return entries;
}
internal event CacheDependencyChangedHandler Changed;
}
}
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