Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / xsp / System / Web / Cache / CacheDependency.cs / 1 / CacheDependency.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
/*
* CacheDependency.cs
*
* Copyright (c) 1998-1999, Microsoft Corporation
*
*/
namespace System.Web.Caching {
using System.Collections;
using System.Text;
using System.IO;
using System.Threading;
using System.Web.Util;
using System.Security.Permissions;
using System.Globalization;
internal interface ICacheDependencyChanged {
void DependencyChanged(Object sender, EventArgs e);
}
///
/// The
///
// Overhead is 24 bytes + object header
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public class CacheDependency : IDisposable {
#if DBG
bool _isUniqueIDInitialized;
#endif
string _uniqueID; // used by HttpCachePolicy for the ETag
object _depFileInfos; // files to monitor for changes, either a DepFileInfo or array of DepFileInfos
object _entries; // cache entries we are dependent on, either a string or array of strings
ICacheDependencyChanged _objNotify; // Associated object to notify when a change occurs
SafeBitVector32 _bits; // status bits for ready, used, changed, disposed
DateTime _utcLastModified; // Time of last modified item
static readonly string[] s_stringsEmpty;
static readonly CacheEntry[] s_entriesEmpty;
static readonly CacheDependency s_dependencyEmpty;
static readonly DepFileInfo[] s_depFileInfosEmpty;
static readonly TimeSpan FUTURE_FILETIME_BUFFER = new TimeSpan(0, 1, 0); // See VSWhidbey 400917
const int BASE_INIT = 0x01;
const int USED = 0x02;
const int CHANGED = 0x04;
const int BASE_DISPOSED = 0x08;
const int WANTS_DISPOSE = 0x10;
const int DERIVED_INIT = 0x20;
const int DERIVED_DISPOSED = 0x40;
internal class DepFileInfo {
internal string _filename;
internal FileAttributesData _fad;
}
static CacheDependency() {
s_stringsEmpty = new string[0];
s_entriesEmpty = new CacheEntry[0];
s_dependencyEmpty = new CacheDependency(0);
s_depFileInfosEmpty = new DepFileInfo[0];
}
// creates an empty dependency which is used only by s_dependencyEmpty
private CacheDependency(int bogus) {
Debug.Assert(s_dependencyEmpty == null, "s_dependencyEmpty == null");
}
protected CacheDependency() {
Init(true, null, null, null, DateTime.MaxValue);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance
/// monitors a file or directory for changes.
///
public CacheDependency(string filename) :
this (filename, DateTime.MaxValue) {
}
public CacheDependency(string filename, DateTime start) {
if (filename == null) {
return;
}
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
string[] filenames = new string[1] {filename};
Init(true, filenames, null, null, utcStart);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance monitors an array
/// files or directories for changes.
///
public CacheDependency(string[] filenames) {
Init(true, filenames, null, null, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, null, null, utcStart);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance monitors an
/// array files, directories, and cache keys for changes.
///
public CacheDependency(string[] filenames, string[] cachekeys) {
Init(true, filenames, cachekeys, null, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, string[] cachekeys, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, cachekeys, null, utcStart);
}
public CacheDependency(string[] filenames, string[] cachekeys, CacheDependency dependency) {
Init(true, filenames, cachekeys, dependency, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, string[] cachekeys, CacheDependency dependency, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, cachekeys, dependency, utcStart);
}
internal CacheDependency(int dummy, string filename) :
this(dummy, filename, DateTime.MaxValue) {
}
internal CacheDependency(int dummy, string filename, DateTime utcStart) {
if (filename == null) {
return;
}
string[] filenames = new string[1] {filename};
Init(false, filenames, null, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames) {
Init(false, filenames, null, null, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, DateTime utcStart) {
Init(false, filenames, null, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys) {
Init(false, filenames, cachekeys, null, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, DateTime utcStart) {
Init(false, filenames, cachekeys, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, CacheDependency dependency) {
Init(false, filenames, cachekeys, dependency, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, CacheDependency dependency, DateTime utcStart) {
Init(false, filenames, cachekeys, dependency, utcStart);
}
void Init(bool isPublic, string[] filenamesArg, string[] cachekeysArg, CacheDependency dependency, DateTime utcStart) {
DepFileInfo[] depFileInfos = s_depFileInfosEmpty;
CacheEntry[] depEntries = s_entriesEmpty;
string [] filenames, cachekeys;
CacheInternal cacheInternal;
_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 CacheEntry) {
depEntries = new CacheEntry[1] {(CacheEntry) (d_entries)};
}
else {
depEntries = (CacheEntry[]) (d_entries);
// verify that the object was fully constructed
foreach (CacheEntry 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;
if (lenMyEntries > 0 && !_bits[CHANGED]) {
CacheEntry[] myEntries = new CacheEntry[lenMyEntries];
// Monitor entries from the existing cache dependency
int i = 0;
foreach (CacheEntry entry in depEntries) {
entry.AddCacheDependencyNotify(this);
myEntries[i++] = entry;
}
// Monitor new entries specified for this depenedency
// Entries must be added to cache, and created before the startTime
cacheInternal = HttpRuntime.CacheInternal;
foreach (string k in cachekeys) {
CacheEntry entry = (CacheEntry) cacheInternal.DoGet(isPublic, k, CacheGetOptions.ReturnCacheEntry);
if (entry != null) {
entry.AddCacheDependencyNotify(this);
myEntries[i++] = entry;
if (entry.UtcCreated > _utcLastModified) {
_utcLastModified = entry.UtcCreated;
}
if ( entry.State != CacheEntry.EntryState.AddedToCache ||
entry.UtcCreated > utcStart) {
#if DBG
if (entry.State != CacheEntry.EntryState.AddedToCache) {
Debug.Trace("CacheDependencyInit", "Entry is not in cache, considered changed:" + k);
}
else {
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();
}
}
public void Dispose() {
// Set this bit just in case our derived ctor forgot to call FinishInit()
_bits[DERIVED_INIT] = true;
if (Use()) {
// Do the dispose only if the cache has not already used us
DisposeInternal();
}
}
protected internal void FinishInit() {
_bits[DERIVED_INIT] = true;
if (_bits[WANTS_DISPOSE]) {
DisposeInternal();
}
}
/*
* Shutdown all dependency monitoring and firing of NotifyDependencyChanged notification.
*/
internal void DisposeInternal() {
_bits[WANTS_DISPOSE] = true;
if (_bits[DERIVED_INIT]) {
if (_bits.ChangeValue(DERIVED_DISPOSED, true)) {
// Dispose derived classes
DependencyDispose();
}
}
if (_bits[BASE_INIT]) {
if (_bits.ChangeValue(BASE_DISPOSED, true)) {
// Dispose ourself
DisposeOurself();
}
}
}
// Allow derived class to dispose itself
protected virtual void DependencyDispose() {
// We do our own dispose work in DisposeOurself, so that
// we don't rely on derived classes calling their base
// DependencyDispose for us to function correctly.
}
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) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
oneEntry.RemoveCacheDependencyNotify(this);
}
else {
CacheEntry[] entries = (CacheEntry[]) l_entries;
foreach (CacheEntry entry in entries) {
// ensure that we handle partially contructed
// objects by checking entry for null
if (entry != null) {
entry.RemoveCacheDependencyNotify(this);
}
}
}
}
}
// allow the first user to declare ownership
internal bool Use() {
return _bits.ChangeValue(USED, true);
}
//
// Has a dependency changed?
//
public bool HasChanged {
get {return _bits[CHANGED];}
}
public DateTime UtcLastModified {
get {
return _utcLastModified;
}
}
protected void SetUtcLastModified(DateTime utcLastModified) {
_utcLastModified = utcLastModified;
}
//
// Add/remove an NotifyDependencyChanged notification.
//
internal void SetCacheDependencyChanged(ICacheDependencyChanged objNotify) {
Debug.Assert(_objNotify == null, "_objNotify == null");
// Set this bit just in case our derived ctor forgot to call FinishInit()
_bits[DERIVED_INIT] = true;
if (!_bits[BASE_DISPOSED]) {
_objNotify = objNotify;
}
}
internal void AppendFileUniqueId(DepFileInfo depFileInfo, StringBuilder sb) {
FileAttributesData fad = depFileInfo._fad;
if (fad == null) {
fad = FileAttributesData.NonExistantAttributesData;
}
sb.Append(depFileInfo._filename);
sb.Append(fad.UtcLastWriteTime.Ticks.ToString("d", NumberFormatInfo.InvariantInfo));
sb.Append(fad.FileSize.ToString(CultureInfo.InvariantCulture));
}
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) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
if (sb == null)
sb = new StringBuilder();
sb.Append(oneEntry.Key);
sb.Append(oneEntry.UtcCreated.Ticks.ToString(CultureInfo.InvariantCulture));
}
else {
CacheEntry[] entries = (CacheEntry[]) l_entries;
foreach (CacheEntry 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.UtcCreated.Ticks.ToString(CultureInfo.InvariantCulture));
}
}
}
}
if (sb != null)
_uniqueID = sb.ToString();
#if DBG
_isUniqueIDInitialized = true;
#endif
}
public virtual string GetUniqueID() {
#if DBG
Debug.Assert(_isUniqueIDInitialized == true, "_isUniqueIDInitialized == true");
#endif
return _uniqueID;
}
//
// Return the cacheEntries monitored by this dependency
//
internal CacheEntry[] CacheEntries {
get {
if (_entries == null) {
return null;
}
CacheEntry oneEntry = _entries as CacheEntry;
if (oneEntry != null) {
return new CacheEntry[1] {oneEntry};
}
return (CacheEntry[]) _entries;
}
}
//
// This object has changed, so fire the NotifyDependencyChanged event.
// We only allow this event to be fired once.
//
protected void NotifyDependencyChanged(Object sender, EventArgs e) {
if (_bits.ChangeValue(CHANGED, true)) {
_utcLastModified = DateTime.UtcNow;
ICacheDependencyChanged objNotify = _objNotify;
if (objNotify != null && !_bits[BASE_DISPOSED]) {
Debug.Trace("CacheDependencyNotifyDependencyChanged", "change occurred");
objNotify.DependencyChanged(sender, e);
}
DisposeInternal();
}
}
//
// ItemRemoved is called when a cache entry we are monitoring has been removed.
//
internal void ItemRemoved() {
NotifyDependencyChanged(this, EventArgs.Empty);
}
//
// FileChange is called when a file we are monitoring has changed.
//
void FileChange(Object sender, FileChangeEvent e) {
Debug.Trace("CacheDependencyFileChange", "FileChange file=" + e.FileName + ";Action=" + e.Action);
NotifyDependencyChanged(sender, e);
}
//
// This will examine the dependency and determine if it's ONLY a file dependency or not
//
internal virtual bool IsFileDependency()
{
object depInfos, l_entries;
// Check and see if we are dependent on any cache entries
l_entries = _entries;
if (l_entries != null) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
return false;
}
else {
CacheEntry[] entries = (CacheEntry[]) 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;
}
//
// This method will return only the file dependencies from this dependency
//
internal virtual string[] GetFileDependencies()
{
object depInfos = _depFileInfos;
if (depInfos != null) {
DepFileInfo oneDepFileInfo = depInfos as DepFileInfo;
if (oneDepFileInfo != null) {
return new string[] {oneDepFileInfo._filename};
}
else {
DepFileInfo[] depFileInfos = (DepFileInfo[]) depInfos;
string[] names = new string[depFileInfos.Length];
for (int i = 0; i < depFileInfos.Length; i++) {
names[i] = depFileInfos[i]._filename;
}
return names;
}
}
return null;
}
}
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class AggregateCacheDependency : CacheDependency, ICacheDependencyChanged {
ArrayList _dependencies;
bool _disposed;
public AggregateCacheDependency() {
// The ctor of every class derived from CacheDependency must call this.
FinishInit();
}
public void Add(params CacheDependency [] dependencies) {
DateTime utcLastModified = DateTime.MinValue;
if (dependencies == null) {
throw new ArgumentNullException("dependencies");
}
// copy array argument contents so they can't be changed beneath us
dependencies = (CacheDependency []) dependencies.Clone();
// validate contents
foreach (CacheDependency d in dependencies) {
if (d == null) {
throw new ArgumentNullException("dependencies");
}
if (!d.Use()) {
throw new InvalidOperationException(SR.GetString(SR.Cache_dependency_used_more_that_once));
}
}
// add dependencies, and check if any have changed
bool hasChanged = false;
lock (this) {
if (!_disposed) {
if (_dependencies == null) {
_dependencies = new ArrayList();
}
_dependencies.AddRange(dependencies);
foreach (CacheDependency d in dependencies) {
d.SetCacheDependencyChanged(this);
if (d.UtcLastModified > utcLastModified) {
utcLastModified = d.UtcLastModified;
}
if (d.HasChanged) {
hasChanged = true;
break;
}
}
}
}
SetUtcLastModified(utcLastModified);
// if a dependency has changed, notify others that we have changed.
if (hasChanged) {
NotifyDependencyChanged(this, EventArgs.Empty);
}
}
// Dispose our dependencies. Note that the call to this
// function is thread safe.
protected override void DependencyDispose() {
CacheDependency[] dependencies = null;
lock (this) {
_disposed = true;
if (_dependencies != null) {
dependencies = (CacheDependency[]) _dependencies.ToArray(typeof(CacheDependency));
_dependencies = null;
}
}
if (dependencies != null) {
foreach (CacheDependency d in dependencies) {
d.DisposeInternal();
}
}
}
// Forward call from the aggregate to the CacheEntry
///
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
/*
* CacheDependency.cs
*
* Copyright (c) 1998-1999, Microsoft Corporation
*
*/
namespace System.Web.Caching {
using System.Collections;
using System.Text;
using System.IO;
using System.Threading;
using System.Web.Util;
using System.Security.Permissions;
using System.Globalization;
internal interface ICacheDependencyChanged {
void DependencyChanged(Object sender, EventArgs e);
}
///
/// The
///
// Overhead is 24 bytes + object header
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public class CacheDependency : IDisposable {
#if DBG
bool _isUniqueIDInitialized;
#endif
string _uniqueID; // used by HttpCachePolicy for the ETag
object _depFileInfos; // files to monitor for changes, either a DepFileInfo or array of DepFileInfos
object _entries; // cache entries we are dependent on, either a string or array of strings
ICacheDependencyChanged _objNotify; // Associated object to notify when a change occurs
SafeBitVector32 _bits; // status bits for ready, used, changed, disposed
DateTime _utcLastModified; // Time of last modified item
static readonly string[] s_stringsEmpty;
static readonly CacheEntry[] s_entriesEmpty;
static readonly CacheDependency s_dependencyEmpty;
static readonly DepFileInfo[] s_depFileInfosEmpty;
static readonly TimeSpan FUTURE_FILETIME_BUFFER = new TimeSpan(0, 1, 0); // See VSWhidbey 400917
const int BASE_INIT = 0x01;
const int USED = 0x02;
const int CHANGED = 0x04;
const int BASE_DISPOSED = 0x08;
const int WANTS_DISPOSE = 0x10;
const int DERIVED_INIT = 0x20;
const int DERIVED_DISPOSED = 0x40;
internal class DepFileInfo {
internal string _filename;
internal FileAttributesData _fad;
}
static CacheDependency() {
s_stringsEmpty = new string[0];
s_entriesEmpty = new CacheEntry[0];
s_dependencyEmpty = new CacheDependency(0);
s_depFileInfosEmpty = new DepFileInfo[0];
}
// creates an empty dependency which is used only by s_dependencyEmpty
private CacheDependency(int bogus) {
Debug.Assert(s_dependencyEmpty == null, "s_dependencyEmpty == null");
}
protected CacheDependency() {
Init(true, null, null, null, DateTime.MaxValue);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance
/// monitors a file or directory for changes.
///
public CacheDependency(string filename) :
this (filename, DateTime.MaxValue) {
}
public CacheDependency(string filename, DateTime start) {
if (filename == null) {
return;
}
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
string[] filenames = new string[1] {filename};
Init(true, filenames, null, null, utcStart);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance monitors an array
/// files or directories for changes.
///
public CacheDependency(string[] filenames) {
Init(true, filenames, null, null, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, null, null, utcStart);
}
///
/// Initializes a new instance of the System.Web.Cache.CacheDependency class. The new instance monitors an
/// array files, directories, and cache keys for changes.
///
public CacheDependency(string[] filenames, string[] cachekeys) {
Init(true, filenames, cachekeys, null, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, string[] cachekeys, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, cachekeys, null, utcStart);
}
public CacheDependency(string[] filenames, string[] cachekeys, CacheDependency dependency) {
Init(true, filenames, cachekeys, dependency, DateTime.MaxValue);
}
public CacheDependency(string[] filenames, string[] cachekeys, CacheDependency dependency, DateTime start) {
DateTime utcStart = DateTimeUtil.ConvertToUniversalTime(start);
Init(true, filenames, cachekeys, dependency, utcStart);
}
internal CacheDependency(int dummy, string filename) :
this(dummy, filename, DateTime.MaxValue) {
}
internal CacheDependency(int dummy, string filename, DateTime utcStart) {
if (filename == null) {
return;
}
string[] filenames = new string[1] {filename};
Init(false, filenames, null, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames) {
Init(false, filenames, null, null, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, DateTime utcStart) {
Init(false, filenames, null, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys) {
Init(false, filenames, cachekeys, null, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, DateTime utcStart) {
Init(false, filenames, cachekeys, null, utcStart);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, CacheDependency dependency) {
Init(false, filenames, cachekeys, dependency, DateTime.MaxValue);
}
internal CacheDependency(int dummy, string[] filenames, string[] cachekeys, CacheDependency dependency, DateTime utcStart) {
Init(false, filenames, cachekeys, dependency, utcStart);
}
void Init(bool isPublic, string[] filenamesArg, string[] cachekeysArg, CacheDependency dependency, DateTime utcStart) {
DepFileInfo[] depFileInfos = s_depFileInfosEmpty;
CacheEntry[] depEntries = s_entriesEmpty;
string [] filenames, cachekeys;
CacheInternal cacheInternal;
_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 CacheEntry) {
depEntries = new CacheEntry[1] {(CacheEntry) (d_entries)};
}
else {
depEntries = (CacheEntry[]) (d_entries);
// verify that the object was fully constructed
foreach (CacheEntry 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;
if (lenMyEntries > 0 && !_bits[CHANGED]) {
CacheEntry[] myEntries = new CacheEntry[lenMyEntries];
// Monitor entries from the existing cache dependency
int i = 0;
foreach (CacheEntry entry in depEntries) {
entry.AddCacheDependencyNotify(this);
myEntries[i++] = entry;
}
// Monitor new entries specified for this depenedency
// Entries must be added to cache, and created before the startTime
cacheInternal = HttpRuntime.CacheInternal;
foreach (string k in cachekeys) {
CacheEntry entry = (CacheEntry) cacheInternal.DoGet(isPublic, k, CacheGetOptions.ReturnCacheEntry);
if (entry != null) {
entry.AddCacheDependencyNotify(this);
myEntries[i++] = entry;
if (entry.UtcCreated > _utcLastModified) {
_utcLastModified = entry.UtcCreated;
}
if ( entry.State != CacheEntry.EntryState.AddedToCache ||
entry.UtcCreated > utcStart) {
#if DBG
if (entry.State != CacheEntry.EntryState.AddedToCache) {
Debug.Trace("CacheDependencyInit", "Entry is not in cache, considered changed:" + k);
}
else {
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();
}
}
public void Dispose() {
// Set this bit just in case our derived ctor forgot to call FinishInit()
_bits[DERIVED_INIT] = true;
if (Use()) {
// Do the dispose only if the cache has not already used us
DisposeInternal();
}
}
protected internal void FinishInit() {
_bits[DERIVED_INIT] = true;
if (_bits[WANTS_DISPOSE]) {
DisposeInternal();
}
}
/*
* Shutdown all dependency monitoring and firing of NotifyDependencyChanged notification.
*/
internal void DisposeInternal() {
_bits[WANTS_DISPOSE] = true;
if (_bits[DERIVED_INIT]) {
if (_bits.ChangeValue(DERIVED_DISPOSED, true)) {
// Dispose derived classes
DependencyDispose();
}
}
if (_bits[BASE_INIT]) {
if (_bits.ChangeValue(BASE_DISPOSED, true)) {
// Dispose ourself
DisposeOurself();
}
}
}
// Allow derived class to dispose itself
protected virtual void DependencyDispose() {
// We do our own dispose work in DisposeOurself, so that
// we don't rely on derived classes calling their base
// DependencyDispose for us to function correctly.
}
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) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
oneEntry.RemoveCacheDependencyNotify(this);
}
else {
CacheEntry[] entries = (CacheEntry[]) l_entries;
foreach (CacheEntry entry in entries) {
// ensure that we handle partially contructed
// objects by checking entry for null
if (entry != null) {
entry.RemoveCacheDependencyNotify(this);
}
}
}
}
}
// allow the first user to declare ownership
internal bool Use() {
return _bits.ChangeValue(USED, true);
}
//
// Has a dependency changed?
//
public bool HasChanged {
get {return _bits[CHANGED];}
}
public DateTime UtcLastModified {
get {
return _utcLastModified;
}
}
protected void SetUtcLastModified(DateTime utcLastModified) {
_utcLastModified = utcLastModified;
}
//
// Add/remove an NotifyDependencyChanged notification.
//
internal void SetCacheDependencyChanged(ICacheDependencyChanged objNotify) {
Debug.Assert(_objNotify == null, "_objNotify == null");
// Set this bit just in case our derived ctor forgot to call FinishInit()
_bits[DERIVED_INIT] = true;
if (!_bits[BASE_DISPOSED]) {
_objNotify = objNotify;
}
}
internal void AppendFileUniqueId(DepFileInfo depFileInfo, StringBuilder sb) {
FileAttributesData fad = depFileInfo._fad;
if (fad == null) {
fad = FileAttributesData.NonExistantAttributesData;
}
sb.Append(depFileInfo._filename);
sb.Append(fad.UtcLastWriteTime.Ticks.ToString("d", NumberFormatInfo.InvariantInfo));
sb.Append(fad.FileSize.ToString(CultureInfo.InvariantCulture));
}
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) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
if (sb == null)
sb = new StringBuilder();
sb.Append(oneEntry.Key);
sb.Append(oneEntry.UtcCreated.Ticks.ToString(CultureInfo.InvariantCulture));
}
else {
CacheEntry[] entries = (CacheEntry[]) l_entries;
foreach (CacheEntry 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.UtcCreated.Ticks.ToString(CultureInfo.InvariantCulture));
}
}
}
}
if (sb != null)
_uniqueID = sb.ToString();
#if DBG
_isUniqueIDInitialized = true;
#endif
}
public virtual string GetUniqueID() {
#if DBG
Debug.Assert(_isUniqueIDInitialized == true, "_isUniqueIDInitialized == true");
#endif
return _uniqueID;
}
//
// Return the cacheEntries monitored by this dependency
//
internal CacheEntry[] CacheEntries {
get {
if (_entries == null) {
return null;
}
CacheEntry oneEntry = _entries as CacheEntry;
if (oneEntry != null) {
return new CacheEntry[1] {oneEntry};
}
return (CacheEntry[]) _entries;
}
}
//
// This object has changed, so fire the NotifyDependencyChanged event.
// We only allow this event to be fired once.
//
protected void NotifyDependencyChanged(Object sender, EventArgs e) {
if (_bits.ChangeValue(CHANGED, true)) {
_utcLastModified = DateTime.UtcNow;
ICacheDependencyChanged objNotify = _objNotify;
if (objNotify != null && !_bits[BASE_DISPOSED]) {
Debug.Trace("CacheDependencyNotifyDependencyChanged", "change occurred");
objNotify.DependencyChanged(sender, e);
}
DisposeInternal();
}
}
//
// ItemRemoved is called when a cache entry we are monitoring has been removed.
//
internal void ItemRemoved() {
NotifyDependencyChanged(this, EventArgs.Empty);
}
//
// FileChange is called when a file we are monitoring has changed.
//
void FileChange(Object sender, FileChangeEvent e) {
Debug.Trace("CacheDependencyFileChange", "FileChange file=" + e.FileName + ";Action=" + e.Action);
NotifyDependencyChanged(sender, e);
}
//
// This will examine the dependency and determine if it's ONLY a file dependency or not
//
internal virtual bool IsFileDependency()
{
object depInfos, l_entries;
// Check and see if we are dependent on any cache entries
l_entries = _entries;
if (l_entries != null) {
CacheEntry oneEntry = l_entries as CacheEntry;
if (oneEntry != null) {
return false;
}
else {
CacheEntry[] entries = (CacheEntry[]) 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;
}
//
// This method will return only the file dependencies from this dependency
//
internal virtual string[] GetFileDependencies()
{
object depInfos = _depFileInfos;
if (depInfos != null) {
DepFileInfo oneDepFileInfo = depInfos as DepFileInfo;
if (oneDepFileInfo != null) {
return new string[] {oneDepFileInfo._filename};
}
else {
DepFileInfo[] depFileInfos = (DepFileInfo[]) depInfos;
string[] names = new string[depFileInfos.Length];
for (int i = 0; i < depFileInfos.Length; i++) {
names[i] = depFileInfos[i]._filename;
}
return names;
}
}
return null;
}
}
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class AggregateCacheDependency : CacheDependency, ICacheDependencyChanged {
ArrayList _dependencies;
bool _disposed;
public AggregateCacheDependency() {
// The ctor of every class derived from CacheDependency must call this.
FinishInit();
}
public void Add(params CacheDependency [] dependencies) {
DateTime utcLastModified = DateTime.MinValue;
if (dependencies == null) {
throw new ArgumentNullException("dependencies");
}
// copy array argument contents so they can't be changed beneath us
dependencies = (CacheDependency []) dependencies.Clone();
// validate contents
foreach (CacheDependency d in dependencies) {
if (d == null) {
throw new ArgumentNullException("dependencies");
}
if (!d.Use()) {
throw new InvalidOperationException(SR.GetString(SR.Cache_dependency_used_more_that_once));
}
}
// add dependencies, and check if any have changed
bool hasChanged = false;
lock (this) {
if (!_disposed) {
if (_dependencies == null) {
_dependencies = new ArrayList();
}
_dependencies.AddRange(dependencies);
foreach (CacheDependency d in dependencies) {
d.SetCacheDependencyChanged(this);
if (d.UtcLastModified > utcLastModified) {
utcLastModified = d.UtcLastModified;
}
if (d.HasChanged) {
hasChanged = true;
break;
}
}
}
}
SetUtcLastModified(utcLastModified);
// if a dependency has changed, notify others that we have changed.
if (hasChanged) {
NotifyDependencyChanged(this, EventArgs.Empty);
}
}
// Dispose our dependencies. Note that the call to this
// function is thread safe.
protected override void DependencyDispose() {
CacheDependency[] dependencies = null;
lock (this) {
_disposed = true;
if (_dependencies != null) {
dependencies = (CacheDependency[]) _dependencies.ToArray(typeof(CacheDependency));
_dependencies = null;
}
}
if (dependencies != null) {
foreach (CacheDependency d in dependencies) {
d.DisposeInternal();
}
}
}
// Forward call from the aggregate to the CacheEntry
///
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