ClientConfigurationSystem.cs source code in C# .NET

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Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Configuration / System / Configuration / ClientConfigurationSystem.cs / 5 / 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 {
                            _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error)); 
                            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; 
            }
            catch { 
                _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error));
                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.
//------------------------------------------------------------------------------ 
// 
//     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 {
                            _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error)); 
                            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; 
            }
            catch { 
                _initError = new ConfigurationErrorsException(SR.GetString(SR.Config_client_config_init_error));
                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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