Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / xsp / System / Web / Util / ResourcePool.cs / 1 / ResourcePool.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { using System.Collections; using System.Threading; /* * ResourcePool provides a place to store expensive resources, * such as network connections, that you want to dispose of when * they are underused. A resource pool can be configured to timeout * resources at a given interval, and to have a max limit of resources. */ class ResourcePool : IDisposable { ArrayList _resources; // the resources int _iDisposable; // resources below this index are candidates for disposal int _max; // max number of resources Timer _timer; // periodic timer TimerCallback _callback; // callback delegate TimeSpan _interval; // callback interval bool _disposed; internal ResourcePool(TimeSpan interval, int max) { _interval = interval; _resources = new ArrayList(4); _max = max; _callback = new TimerCallback(this.TimerProc); Debug.Validate("ResourcePool", this); } ~ResourcePool() { Dispose(false); } public void Dispose() { Dispose(true); } void Dispose(bool disposing) { lock (this) { if (!_disposed) { if (_resources != null) { foreach (IDisposable resource in _resources) { resource.Dispose(); } _resources.Clear(); } if (_timer != null) { _timer.Dispose(); } Debug.Trace("ResourcePool", "Disposed"); _disposed = true; // Suppress finalization of this disposed instance. if (disposing) { GC.SuppressFinalize(this); } } } } internal object RetrieveResource() { object result = null; // avoid lock in common case if (_resources.Count != 0) { lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count == 0) { result = null; Debug.Trace("ResourcePool", "RetrieveResource returned null"); } else { result = _resources[_resources.Count-1]; _resources.RemoveAt(_resources.Count-1); if (_resources.Count < _iDisposable) { _iDisposable = _resources.Count; } } Debug.Validate("ResourcePool", this); } } } return result; } internal void StoreResource(IDisposable o) { lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count < _max) { _resources.Add(o); o = null; if (_timer == null) { #if DBG if (!Debug.IsTagPresent("Timer") || Debug.IsTagEnabled("Timer")) #endif { _timer = new Timer(_callback, null, _interval, _interval); } } } Debug.Validate("ResourcePool", this); } } if (o != null) { Debug.Trace("ResourcePool", "StoreResource reached max=" + _max); o.Dispose(); } } void TimerProc(Object userData) { IDisposable[] a = null; lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count == 0) { if (_timer != null) { _timer.Dispose(); _timer = null; } Debug.Validate("ResourcePool", this); return; } a = new IDisposable[_iDisposable]; _resources.CopyTo(0, a, 0, _iDisposable); _resources.RemoveRange(0, _iDisposable); // It means that whatever remain in _resources will be disposed // next time the timer proc is called. _iDisposable = _resources.Count; Debug.Trace("ResourcePool", "Timer disposing " + a.Length + "; remaining=" + _resources.Count); Debug.Validate("ResourcePool", this); } } if (a != null) { for (int i = 0; i < a.Length; i++) { try { a[i].Dispose(); } catch { // ignore all errors } } } } #if DBG internal void DebugValidate() { Debug.CheckValid(_resources != null, "_resources != null"); Debug.CheckValid(0 <= _iDisposable && _iDisposable <= _resources.Count, "0 <= _iDisposable && _iDisposable <= _resources.Count" + ";_iDisposable=" + _iDisposable + ";_resources.Count=" + _resources.Count); Debug.CheckValid(_interval > TimeSpan.Zero, "_interval > TimeSpan.Zero" + ";_interval=" + _interval); } #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { using System.Collections; using System.Threading; /* * ResourcePool provides a place to store expensive resources, * such as network connections, that you want to dispose of when * they are underused. A resource pool can be configured to timeout * resources at a given interval, and to have a max limit of resources. */ class ResourcePool : IDisposable { ArrayList _resources; // the resources int _iDisposable; // resources below this index are candidates for disposal int _max; // max number of resources Timer _timer; // periodic timer TimerCallback _callback; // callback delegate TimeSpan _interval; // callback interval bool _disposed; internal ResourcePool(TimeSpan interval, int max) { _interval = interval; _resources = new ArrayList(4); _max = max; _callback = new TimerCallback(this.TimerProc); Debug.Validate("ResourcePool", this); } ~ResourcePool() { Dispose(false); } public void Dispose() { Dispose(true); } void Dispose(bool disposing) { lock (this) { if (!_disposed) { if (_resources != null) { foreach (IDisposable resource in _resources) { resource.Dispose(); } _resources.Clear(); } if (_timer != null) { _timer.Dispose(); } Debug.Trace("ResourcePool", "Disposed"); _disposed = true; // Suppress finalization of this disposed instance. if (disposing) { GC.SuppressFinalize(this); } } } } internal object RetrieveResource() { object result = null; // avoid lock in common case if (_resources.Count != 0) { lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count == 0) { result = null; Debug.Trace("ResourcePool", "RetrieveResource returned null"); } else { result = _resources[_resources.Count-1]; _resources.RemoveAt(_resources.Count-1); if (_resources.Count < _iDisposable) { _iDisposable = _resources.Count; } } Debug.Validate("ResourcePool", this); } } } return result; } internal void StoreResource(IDisposable o) { lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count < _max) { _resources.Add(o); o = null; if (_timer == null) { #if DBG if (!Debug.IsTagPresent("Timer") || Debug.IsTagEnabled("Timer")) #endif { _timer = new Timer(_callback, null, _interval, _interval); } } } Debug.Validate("ResourcePool", this); } } if (o != null) { Debug.Trace("ResourcePool", "StoreResource reached max=" + _max); o.Dispose(); } } void TimerProc(Object userData) { IDisposable[] a = null; lock (this) { Debug.Validate("ResourcePool", this); if (!_disposed) { if (_resources.Count == 0) { if (_timer != null) { _timer.Dispose(); _timer = null; } Debug.Validate("ResourcePool", this); return; } a = new IDisposable[_iDisposable]; _resources.CopyTo(0, a, 0, _iDisposable); _resources.RemoveRange(0, _iDisposable); // It means that whatever remain in _resources will be disposed // next time the timer proc is called. _iDisposable = _resources.Count; Debug.Trace("ResourcePool", "Timer disposing " + a.Length + "; remaining=" + _resources.Count); Debug.Validate("ResourcePool", this); } } if (a != null) { for (int i = 0; i < a.Length; i++) { try { a[i].Dispose(); } catch { // ignore all errors } } } } #if DBG internal void DebugValidate() { Debug.CheckValid(_resources != null, "_resources != null"); Debug.CheckValid(0 <= _iDisposable && _iDisposable <= _resources.Count, "0 <= _iDisposable && _iDisposable <= _resources.Count" + ";_iDisposable=" + _iDisposable + ";_resources.Count=" + _resources.Count); Debug.CheckValid(_interval > TimeSpan.Zero, "_interval > TimeSpan.Zero" + ";_interval=" + _interval); } #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Operators.cs
- LightweightCodeGenerator.cs
- NamespaceMapping.cs
- ProgressChangedEventArgs.cs
- Animatable.cs
- ListViewDeletedEventArgs.cs
- ConfigUtil.cs
- UInt16Converter.cs
- TypeLoadException.cs
- QuaternionRotation3D.cs
- AnimationTimeline.cs
- XmlIgnoreAttribute.cs
- MediaContext.cs
- _AutoWebProxyScriptEngine.cs
- TimeoutConverter.cs
- PageBreakRecord.cs
- Glyph.cs
- SafeProcessHandle.cs
- ConfigsHelper.cs
- Guid.cs
- CipherData.cs
- ScrollableControlDesigner.cs
- Triplet.cs
- SqlServices.cs
- KeyValueSerializer.cs
- ProfileServiceManager.cs
- ClientScriptManagerWrapper.cs
- RoleManagerEventArgs.cs
- UserControlBuildProvider.cs
- BindingUtils.cs
- Base64Stream.cs
- RoutingService.cs
- SimpleWorkerRequest.cs
- RegexTypeEditor.cs
- AccessDataSource.cs
- RepeaterCommandEventArgs.cs
- TextEditorSpelling.cs
- ChangeTracker.cs
- PersonalizationDictionary.cs
- DllHostedComPlusServiceHost.cs
- CodeTypeParameter.cs
- SqlTopReducer.cs
- EnumMember.cs
- Variable.cs
- SqlNotificationRequest.cs
- PasswordRecovery.cs
- HyperlinkAutomationPeer.cs
- WebConfigurationHost.cs
- ManualResetEvent.cs
- TextEndOfLine.cs
- XsltLoader.cs
- ProviderUtil.cs
- FontFamilyIdentifier.cs
- webproxy.cs
- HScrollProperties.cs
- FormatVersion.cs
- ImageSourceValueSerializer.cs
- MdImport.cs
- Buffer.cs
- WorkflowInstanceExtensionProvider.cs
- recordstate.cs
- XAMLParseException.cs
- RowToParametersTransformer.cs
- EventLogPermissionEntryCollection.cs
- DBCSCodePageEncoding.cs
- Odbc32.cs
- WorkItem.cs
- SessionSwitchEventArgs.cs
- RenderCapability.cs
- ViewPort3D.cs
- UnionExpr.cs
- XsdDuration.cs
- XmlReturnReader.cs
- ToolStripTextBox.cs
- CacheMode.cs
- StylusOverProperty.cs
- ForceCopyBuildProvider.cs
- SEHException.cs
- TextTrailingWordEllipsis.cs
- AssemblyBuilder.cs
- HotSpot.cs
- AnimationLayer.cs
- ClassGenerator.cs
- TreeSet.cs
- GridView.cs
- UpdateTranslator.cs
- ParameterModifier.cs
- CFStream.cs
- VisualCollection.cs
- AdRotator.cs
- EntityException.cs
- XmlNotation.cs
- TextCompositionManager.cs
- TypeDescriptionProvider.cs
- PageClientProxyGenerator.cs
- ReceiveActivityDesignerTheme.cs
- ImageMetadata.cs
- FileEnumerator.cs
- AppliedDeviceFiltersEditor.cs
- TextUtf8RawTextWriter.cs