Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / ClientConfigurationSystem.cs / 1305376 / ClientConfigurationSystem.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Configuration { using System.Configuration.Internal; using System.Globalization; using System.Collections; using System.IO; using System.Xml; using System.Security; using System.Security.Permissions; using System.Threading; using System.Net; using Assembly = System.Reflection.Assembly; using StringBuilder = System.Text.StringBuilder; internal sealed class ClientConfigurationSystem : IInternalConfigSystem { private const string SystemDiagnosticsConfigKey = "system.diagnostics"; private const string SystemNetGroupKey = "system.net/"; private IConfigSystem _configSystem; private IInternalConfigRoot _configRoot; private ClientConfigurationHost _configHost; private IInternalConfigRecord _machineConfigRecord; private IInternalConfigRecord _completeConfigRecord; private Exception _initError; private bool _isInitInProgress; private bool _isMachineConfigInited; private bool _isUserConfigInited; private bool _isAppConfigHttp; internal ClientConfigurationSystem() { _configSystem = new ConfigSystem(); _configSystem.Init(typeof(ClientConfigurationHost), null, null); _configHost = (ClientConfigurationHost) _configSystem.Host; _configRoot = _configSystem.Root; _configRoot.ConfigRemoved += OnConfigRemoved; _isAppConfigHttp = _configHost.IsAppConfigHttp; // VSWhidbey 606116: Config has a dependency on Uri class which has // a new static constructor that calls config. We need a dummy reference // to Uri class so the static constructor would be involved first to // initialize config. string dummy = System.Uri.SchemeDelimiter; } // Return true if the section might be used during initialization of the configuration system, // and thus lead to deadlock if appropriate measures are not taken. bool IsSectionUsedInInit(string configKey) { return configKey == SystemDiagnosticsConfigKey || (_isAppConfigHttp && configKey.StartsWith(SystemNetGroupKey, StringComparison.Ordinal)); } // Return true if the section should only use the machine configuration and not use the // application configuration. This is only true for system.net sections when the configuration // file for the application is downloaded via http using System.Net.WebClient. bool DoesSectionOnlyUseMachineConfig(string configKey) { return _isAppConfigHttp && configKey.StartsWith(SystemNetGroupKey, StringComparison.Ordinal); } // Ensure that initialization has completed, while handling re-entrancy issues // for certain sections that may be used during initialization itself. void EnsureInit(string configKey) { bool doInit = false; lock (this) { // If the user config is not initialized, then we must either: // a. Perform the initialization ourselves if no other thread is doing it, or // b. Wait for the initialization to complete if we know the section is not used during initialization itself, or // c. Ignore initialization if the section can be used during initialization. Note that GetSection() // returns null is initialization has not completed. if (!_isUserConfigInited) { if (!_isInitInProgress) { _isInitInProgress = true; doInit = true; } else if (!IsSectionUsedInInit(configKey)) { // Wait for initialization to complete. Monitor.Wait(this); } } } if (doInit) { try { try { try { // Initialize machine configuration. _machineConfigRecord = _configRoot.GetConfigRecord( ClientConfigurationHost.MachineConfigPath); _machineConfigRecord.ThrowIfInitErrors(); // Make machine configuration available to system.net sections // when application configuration is downloaded via http. _isMachineConfigInited = true; // // Prevent deadlocks in the networking classes by loading // networking config before making a networking request. // Any requests for sections used in initialization during // the call to EnsureConfigLoaded() will be served by // _machine.config or will return null. // if (_isAppConfigHttp) { ConfigurationManagerHelperFactory.Instance.EnsureNetConfigLoaded(); } // // Now load the rest of configuration // _configHost.RefreshConfigPaths(); string configPath; if (_configHost.HasLocalConfig) { configPath = ClientConfigurationHost.LocalUserConfigPath; } else if (_configHost.HasRoamingConfig) { configPath = ClientConfigurationHost.RoamingUserConfigPath; } else { configPath = ClientConfigurationHost.ExeConfigPath; } _completeConfigRecord = _configRoot.GetConfigRecord(configPath); _completeConfigRecord.ThrowIfInitErrors(); _isUserConfigInited = true; } catch (Exception e) { _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error), e); throw _initError; } } catch { ConfigurationManager.SetInitError(_initError); _isMachineConfigInited = true; _isUserConfigInited = true; throw; } } finally { lock (this) { try { // Notify ConfigurationSettings that initialization has fully completed, // even if unsuccessful. ConfigurationManager.CompleteConfigInit(); _isInitInProgress = false; } finally { // Wake up all threads waiting for initialization to complete. Monitor.PulseAll(this); } } } } } private void PrepareClientConfigSystem(string sectionName) { // Ensure the configuration system is inited for this section. if (!_isUserConfigInited) { EnsureInit(sectionName); } // If an error occurred during initialzation, throw it. if (_initError != null) { throw _initError; } } // // If config has been removed because initialization was not complete, // fetch a new configuration record. The record will be created and // completely initialized as RequireCompleteInit() will have been called // on the ClientConfigurationHost before we receive this event. // private void OnConfigRemoved(object sender, InternalConfigEventArgs e) { try { IInternalConfigRecord newConfigRecord = _configRoot.GetConfigRecord(_completeConfigRecord.ConfigPath); _completeConfigRecord = newConfigRecord; _completeConfigRecord.ThrowIfInitErrors(); } catch (Exception ex) { _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error), ex); ConfigurationManager.SetInitError(_initError); throw _initError; } } object IInternalConfigSystem.GetSection(string sectionName) { PrepareClientConfigSystem(sectionName); // Get the appropriate config record for the section. IInternalConfigRecord configRecord = null; if (DoesSectionOnlyUseMachineConfig(sectionName)) { if (_isMachineConfigInited) { configRecord = _machineConfigRecord; } } else { if (_isUserConfigInited) { configRecord = _completeConfigRecord; } } // Call GetSection(), or return null if no configuration is yet available. if (configRecord != null) { return configRecord.GetSection(sectionName); } else { return null; } } void IInternalConfigSystem.RefreshConfig(string sectionName) { PrepareClientConfigSystem(sectionName); if (_isMachineConfigInited) { _machineConfigRecord.RefreshSection(sectionName); } } // Supports user config bool IInternalConfigSystem.SupportsUserConfig { get {return true;} } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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