Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / _SpnDictionary.cs / 1305376 / _SpnDictionary.cs
/*++ Copyright (c) Microsoft Corporation Module Name: _SpnDictionary.cs Abstract: This internal class implements a static mutlithreaded dictionary for user-registered SPNs. An SPN is mapped based on a Uri prefix that contains scheme, host and port. Author: Alexei Vopilov 15-Nov-2003 Revision History: --*/ namespace System.Net { using System; using System.Collections; using System.Collections.Specialized; using System.Security.Permissions; internal class SpnDictionary : StringDictionary { // //A Hashtable can support one writer and multiple readers concurrently // private Hashtable m_SyncTable = Hashtable.Synchronized(new Hashtable()); // // internal SpnDictionary():base() { } // // // public override int Count { get { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable.Count; } } // // We are thread safe // public override bool IsSynchronized { get { return true; } } // // Internal lookup, bypasses security checks // internal string InternalGet(string canonicalKey) { int lastLength = 0; string key = null; // This lock is required to avoid getting InvalidOperationException // because the collection was modified during enumeration. By design // a Synchronized Hashtable throws if modifications occur while an // enumeration is in progress. Manually locking the Hashtable to // prevent modification during enumeration is the best solution. // Catching the exception and retrying could potentially never // succeed in the face of significant updates. lock (m_SyncTable.SyncRoot) { foreach (object o in m_SyncTable.Keys){ string s = (string) o; if(s != null && s.Length > lastLength){ if(String.Compare(s,0,canonicalKey,0,s.Length,StringComparison.OrdinalIgnoreCase) == 0){ lastLength = s.Length; key = s; } } } } return (key != null) ? (string)m_SyncTable[key]: null; } internal void InternalSet(string canonicalKey, string spn) { m_SyncTable[canonicalKey] = spn; } // // Public lookup method // public override string this[string key] { get { key = GetCanonicalKey(key); return InternalGet(key); } set { key = GetCanonicalKey(key); InternalSet(key, value); } } // public override ICollection Keys { get { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable.Keys; } } // public override object SyncRoot { [HostProtection(Synchronization=true)] get { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable; } } // public override ICollection Values { get { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable.Values; } } // public override void Add(string key, string value) { key = GetCanonicalKey(key); m_SyncTable.Add(key, value); } // public override void Clear() { ExceptionHelper.WebPermissionUnrestricted.Demand(); m_SyncTable.Clear(); } // public override bool ContainsKey(string key) { key = GetCanonicalKey(key); return m_SyncTable.ContainsKey(key); } // public override bool ContainsValue(string value) { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable.ContainsValue(value); } // public override void CopyTo(Array array, int index) { ExceptionHelper.WebPermissionUnrestricted.Demand(); m_SyncTable.CopyTo(array, index); } // public override IEnumerator GetEnumerator() { ExceptionHelper.WebPermissionUnrestricted.Demand(); return m_SyncTable.GetEnumerator(); } // public override void Remove(string key) { key = GetCanonicalKey(key); m_SyncTable.Remove(key); } // // Private stuff: We want to serialize on updates on one thread // private static string GetCanonicalKey(string key) { if( key == null ) { throw new ArgumentNullException("key"); } try { Uri uri = new Uri(key); key = uri.GetParts(UriComponents.Scheme | UriComponents.Host | UriComponents.Port | UriComponents.Path, UriFormat.SafeUnescaped); new WebPermission(NetworkAccess.Connect, new Uri(key)).Demand(); } catch(UriFormatException e) { throw new ArgumentException(SR.GetString(SR.net_mustbeuri, "key"), "key", e); } return key; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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