Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / 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 } }
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