//
// This will examine the dependency and determine if it's ONLY a file dependency or not
//
internal virtual bool IsFileDependency()
{
#if USE_MEMORY_CACHE
if (CacheInternal.UseMemoryCache)
{
if (_entryChangeMonitor != null)
{
return(false);
}
if (_fileChangeMonitor != null)
{
return(true);
}
return(false);
}
#endif
object depInfos, l_entries;
// Check and see if we are dependent on any cache entries
l_entries = _entries;
if (l_entries != null)
{
DepCacheInfo oneEntry = l_entries as DepCacheInfo;
if (oneEntry != null)
{
return(false);
}
else
{
DepCacheInfo[] entries = (DepCacheInfo[])l_entries;
if (entries != null && entries.Length > 0)
{
return(false);
}
}
}
depInfos = _depFileInfos;
if (depInfos != null)
{
DepFileInfo oneDepFileInfo = depInfos as DepFileInfo;
if (oneDepFileInfo != null)
{
return(true);
}
else
{
DepFileInfo[] depFileInfos = (DepFileInfo[])depInfos;
if (depFileInfos != null && depFileInfos.Length > 0)
{
return(true);
}
}
}
return(false);
}
public void KeepDependenciesAlive()
{
if (_entries != null)
{
// update the last access time of every cache item that depends on this dependency
DepCacheInfo oneEntry = _entries as DepCacheInfo;
if (oneEntry != null)
{
oneEntry._cacheStore.Get(oneEntry._key);
return;
}
foreach (DepCacheInfo entry in (DepCacheInfo[])_entries)
{
if (entry != null)
{
object item = entry._cacheStore.Get(entry._key);
}
}
}
}
void InitUniqueID()
{
StringBuilder sb = null;
object l_depFileInfos, l_entries;
#if !FEATURE_PAL // no File Change Monitoring
// get unique id from files
l_depFileInfos = _depFileInfos;
if (l_depFileInfos != null)
{
DepFileInfo oneDepFileInfo = l_depFileInfos as DepFileInfo;
if (oneDepFileInfo != null)
{
sb = new StringBuilder();
AppendFileUniqueId(oneDepFileInfo, sb);
}
else
{
DepFileInfo[] depFileInfos = (DepFileInfo[])l_depFileInfos;
foreach (DepFileInfo depFileInfo in depFileInfos)
{
// ensure that we handle partially contructed
// objects by checking filename for null
if (depFileInfo._filename != null)
{
if (sb == null)
{
sb = new StringBuilder();
}
AppendFileUniqueId(depFileInfo, sb);
}
}
}
}
#endif // !FEATURE_PAL
// get unique id from cache entries
l_entries = _entries;
if (l_entries != null)
{
DepCacheInfo oneEntry = l_entries as DepCacheInfo;
if (oneEntry != null)
{
if (sb == null)
{
sb = new StringBuilder();
}
sb.Append(oneEntry._key);
sb.Append(oneEntry.GetHashCode().ToString(CultureInfo.InvariantCulture));
}
else
{
DepCacheInfo[] entries = (DepCacheInfo[])l_entries;
foreach (DepCacheInfo entry in entries)
{
// ensure that we handle partially contructed
// objects by checking entry for null
if (entry != null)
{
if (sb == null)
{
sb = new StringBuilder();
}
sb.Append(entry._key);
sb.Append(entry.GetHashCode().ToString(CultureInfo.InvariantCulture));
}
}
}
}
if (sb != null)
{
_uniqueID = sb.ToString();
}
#if DBG
_isUniqueIDInitialized = true;
#endif
}
void DisposeOurself()
{
// guarantee that we execute only once if an exception
// is thrown from this function by nulling fields before
// we access them
object l_depFileInfos = _depFileInfos;
object l_entries = _entries;
_objNotify = null;
_depFileInfos = null;
_entries = null;
// stop monitoring files
if (l_depFileInfos != null)
{
FileChangesMonitor fmon = HttpRuntime.FileChangesMonitor;
DepFileInfo oneDepFileInfo = l_depFileInfos as DepFileInfo;
if (oneDepFileInfo != null)
{
fmon.StopMonitoringPath(oneDepFileInfo._filename, this);
}
else
{
DepFileInfo[] depFileInfos = (DepFileInfo[])l_depFileInfos;
foreach (DepFileInfo depFileInfo in depFileInfos)
{
// ensure that we handle partially contructed
// objects by checking filename for null
string filename = depFileInfo._filename;
if (filename != null)
{
fmon.StopMonitoringPath(filename, this);
}
}
}
}
// stop monitoring cache items
if (l_entries != null)
{
DepCacheInfo oneEntry = l_entries as DepCacheInfo;
if (oneEntry != null)
{
oneEntry._cacheStore.RemoveDependent(oneEntry._key, this);
}
else
{
DepCacheInfo[] entries = (DepCacheInfo[])l_entries;
foreach (DepCacheInfo entry in entries)
{
// ensure that we handle partially contructed
// objects by checking entry for null
if (entry != null)
{
entry._cacheStore.RemoveDependent(entry._key, this);
}
}
}
}
#if USE_MEMORY_CACHE
if (_fileChangeMonitor != null)
{
_fileChangeMonitor.Dispose();
}
if (_entryChangeMonitor != null)
{
_entryChangeMonitor.Dispose();
}
#endif
}
void Init(bool isPublic, string[] filenamesArg, string[] cachekeysArg, CacheDependency dependency, DateTime utcStart)
{
#if USE_MEMORY_CACHE
if (CacheInternal.UseMemoryCache)
{
InitForMemoryCache(isPublic, filenamesArg, cachekeysArg, dependency, utcStart);
return;
}
#endif
DepFileInfo[] depFileInfos = s_depFileInfosEmpty;
DepCacheInfo[] depEntries = s_entriesEmpty;
string [] filenames, cachekeys;
CacheStoreProvider cache;
_bits = new SafeBitVector32(0);
// copy array argument contents so they can't be changed beneath us
if (filenamesArg != null)
{
filenames = (string [])filenamesArg.Clone();
}
else
{
filenames = null;
}
if (cachekeysArg != null)
{
cachekeys = (string [])cachekeysArg.Clone();
}
else
{
cachekeys = null;
}
_utcLastModified = DateTime.MinValue;
try {
// validate filenames array
if (filenames == null)
{
filenames = s_stringsEmpty;
}
else
{
foreach (string f in filenames)
{
if (f == null)
{
throw new ArgumentNullException("filenamesArg");
}
// demand PathDiscovery if public
if (isPublic)
{
InternalSecurityPermissions.PathDiscovery(f).Demand();
}
}
}
if (cachekeys == null)
{
cachekeys = s_stringsEmpty;
}
else
{
// validate cachekeys array
foreach (string k in cachekeys)
{
if (k == null)
{
throw new ArgumentNullException("cachekeysArg");
}
}
}
// copy all parts of another dependency if provided
if (dependency == null)
{
dependency = s_dependencyEmpty;
}
else
{
if (dependency.GetType() != s_dependencyEmpty.GetType())
{
throw new ArgumentException(SR.GetString(SR.Invalid_Dependency_Type));
}
// Copy the parts of the dependency we need before
// we reference them, as the dependency can change
// underneath us.
object d_depFileInfos = dependency._depFileInfos;
object d_entries = dependency._entries;
DateTime d_lastModified = dependency._utcLastModified;
// if the dependency we're copying has changed, we're done
if (dependency._bits[CHANGED])
{
_bits[CHANGED] = true;
// There is nothing to dispose because we haven't started
// monitoring anything yet. But we call DisposeInternal in
// order to set the WANTS_DISPOSE bit.
DisposeInternal();
return;
}
// copy depFileInfos
if (d_depFileInfos != null)
{
if (d_depFileInfos is DepFileInfo)
{
depFileInfos = new DepFileInfo[1] {
(DepFileInfo)d_depFileInfos
};
}
else
{
depFileInfos = (DepFileInfo[])(d_depFileInfos);
}
// verify that the object was fully constructed
// and that we have permission to discover the file
foreach (DepFileInfo depFileInfo in depFileInfos)
{
string f = depFileInfo._filename;
if (f == null)
{
_bits[CHANGED] = true;
// There is nothing to dispose because we haven't started
// monitoring anything yet. But we call DisposeInternal in
// order to set the WANTS_DISPOSE bit.
DisposeInternal();
return;
}
// demand PathDiscovery if public
if (isPublic)
{
InternalSecurityPermissions.PathDiscovery(f).Demand();
}
}
}
// copy cache entries
if (d_entries != null)
{
if (d_entries is DepCacheInfo)
{
depEntries = new DepCacheInfo[1] {
(DepCacheInfo)(d_entries)
};
}
else
{
depEntries = (DepCacheInfo[])(d_entries);
// verify that the object was fully constructed
foreach (DepCacheInfo entry in depEntries)
{
if (entry == null)
{
_bits[CHANGED] = true;
// There is nothing to dispose because we haven't started
// monitoring anything yet. But we call DisposeInternal in
// order to set the WANTS_DISPOSE bit.
DisposeInternal();
return;
}
}
}
}
_utcLastModified = d_lastModified;
}
// Monitor files for changes
int lenMyDepFileInfos = depFileInfos.Length + filenames.Length;
if (lenMyDepFileInfos > 0)
{
DepFileInfo[] myDepFileInfos = new DepFileInfo[lenMyDepFileInfos];
FileChangeEventHandler handler = new FileChangeEventHandler(this.FileChange);
FileChangesMonitor fmon = HttpRuntime.FileChangesMonitor;
int i;
for (i = 0; i < lenMyDepFileInfos; i++)
{
myDepFileInfos[i] = new DepFileInfo();
}
// monitor files from the existing dependency
// note that we don't check for start times in the existing dependency
i = 0;
foreach (DepFileInfo depFileInfo in depFileInfos)
{
string f = depFileInfo._filename;
fmon.StartMonitoringPath(f, handler, out myDepFileInfos[i]._fad);
myDepFileInfos[i]._filename = f;
i++;
}
// monitor new files
DateTime utcNow = DateTime.MinValue;
foreach (string f in filenames)
{
DateTime utcLastWrite = fmon.StartMonitoringPath(f, handler, out myDepFileInfos[i]._fad);
myDepFileInfos[i]._filename = f;
i++;
if (utcLastWrite > _utcLastModified)
{
_utcLastModified = utcLastWrite;
}
// check if file has changed since the start time
if (utcStart < DateTime.MaxValue)
{
if (utcNow == DateTime.MinValue)
{
utcNow = DateTime.UtcNow;
}
Debug.Trace("CacheDependencyInit", "file=" + f + "; utcStart=" + utcStart + "; utcLastWrite=" + utcLastWrite);
if (utcLastWrite >= utcStart &&
!(utcLastWrite - utcNow > FUTURE_FILETIME_BUFFER)) // See VSWhidbey 400917
{
Debug.Trace("CacheDependencyInit", "changes occurred since start time for file " + f);
_bits[CHANGED] = true;
break;
}
}
}
if (myDepFileInfos.Length == 1)
{
_depFileInfos = myDepFileInfos[0];
}
else
{
_depFileInfos = myDepFileInfos;
}
}
// Monitor other cache entries for changes
int lenMyEntries = depEntries.Length + cachekeys.Length;
DateTime lastUpdated;
if (lenMyEntries > 0 && !_bits[CHANGED])
{
DepCacheInfo[] myEntries = new DepCacheInfo[lenMyEntries];
// Monitor entries from the existing cache dependency
int i = 0;
foreach (DepCacheInfo entry in depEntries)
{
entry._cacheStore.AddDependent(entry._key, this, out lastUpdated);
myEntries[i++] = entry;
}
// Monitor new entries specified for this depenedency
// Entries must be added to cache, and created before the startTime
cache = isPublic ? HttpRuntime.Cache.ObjectCache : HttpRuntime.Cache.InternalCache;
foreach (string k in cachekeys)
{
if (cache.AddDependent(k, this, out lastUpdated))
{
myEntries[i++] = new DepCacheInfo()
{
_cacheStore = cache, _key = k
};
if (lastUpdated > _utcLastModified)
{
_utcLastModified = lastUpdated;
}
if (lastUpdated > utcStart) // Cache item has been updated since start, consider changed
{
#if DBG
Debug.Trace("CacheDependencyInit", "Changes occurred to entry since start time:" + k);
#endif
_bits[CHANGED] = true;
break;
}
}
else
{
Debug.Trace("CacheDependencyInit", "Cache item not found to create dependency on:" + k);
_bits[CHANGED] = true;
break;
}
}
if (myEntries.Length == 1)
{
_entries = myEntries[0];
}
else
{
_entries = myEntries;
}
}
_bits[BASE_INIT] = true;
if (dependency._bits[CHANGED])
{
_bits[CHANGED] = true;
}
if (_bits[WANTS_DISPOSE] || _bits[CHANGED])
{
DisposeInternal();
}
Debug.Assert(_objNotify == null, "_objNotify == null");
}
catch {
// derived constructor will not execute due to the throw,
// so we just force a dispose on ourselves
_bits[BASE_INIT] = true;
DisposeInternal();
throw;
}
finally {
InitUniqueID();
}
}
