Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Diagnostics / DiagnosticsConfiguration.cs / 1 / DiagnosticsConfiguration.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Diagnostics { using System; using System.Reflection; using System.Collections; using System.Configuration; using System.Threading; using System.Runtime.Versioning; internal enum InitState { NotInitialized, Initializing, Initialized } internal static class DiagnosticsConfiguration { private static SystemDiagnosticsSection configSection; private static InitState initState = InitState.NotInitialized; // setting for Switch.switchSetting internal static SwitchElementsCollection SwitchSettings { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null) return configSectionSav.Switches; else return null; } } // setting for DefaultTraceListener.AssertUIEnabled internal static bool AssertUIEnabled { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Assert != null) return configSectionSav.Assert.AssertUIEnabled; else return true; // the default } } internal static string ConfigFilePath { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null) return configSectionSav.ElementInformation.Source; else return string.Empty; // the default } } // setting for DefaultTraceListener.LogFileName internal static string LogFileName { [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Assert != null) return configSectionSav.Assert.LogFileName; else return string.Empty; // the default } } // setting for TraceInternal.AutoFlush internal static bool AutoFlush { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Trace != null) return configSectionSav.Trace.AutoFlush; else return false; // the default } } // setting for TraceInternal.UseGlobalLock internal static bool UseGlobalLock { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Trace != null) return configSectionSav.Trace.UseGlobalLock; else return true; // the default } } // setting for TraceInternal.IndentSize internal static int IndentSize { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Trace != null) return configSectionSav.Trace.IndentSize; else return 4; // the default } } #if !FEATURE_PAL // perfcounter internal static int PerfomanceCountersFileMappingSize { get { for (int retryCount = 0; !CanInitialize() && retryCount <= 5; ++retryCount) { if (retryCount == 5) return SharedPerformanceCounter.DefaultCountersFileMappingSize; System.Threading.Thread.Sleep(200); } Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.PerfCounters != null) { int size = configSectionSav.PerfCounters.FileMappingSize; if (size < SharedPerformanceCounter.MinCountersFileMappingSize) size = SharedPerformanceCounter.MinCountersFileMappingSize; if (size > SharedPerformanceCounter.MaxCountersFileMappingSize) size = SharedPerformanceCounter.MaxCountersFileMappingSize; return size; } else return SharedPerformanceCounter.DefaultCountersFileMappingSize; } } #endif // !FEATURE_PAL internal static ListenerElementsCollection SharedListeners { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null) return configSectionSav.SharedListeners; else return null; } } internal static SourceElementsCollection Sources { get { Initialize(); SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null && configSectionSav.Sources != null) return configSectionSav.Sources; else return null; } } internal static SystemDiagnosticsSection SystemDiagnosticsSection { get { Initialize(); return configSection; } } private static SystemDiagnosticsSection GetConfigSection() { SystemDiagnosticsSection configSection = (SystemDiagnosticsSection) PrivilegedConfigurationManager.GetSection("system.diagnostics"); return configSection; } internal static bool IsInitializing() { return initState == InitState.Initializing; } internal static bool IsInitialized() { return initState == InitState.Initialized; } internal static bool CanInitialize() { return (initState != InitState.Initializing) && !ConfigurationManagerInternalFactory.Instance.SetConfigurationSystemInProgress; } internal static void Initialize() { // Initialize() is also called by other components outside of Trace (such as PerformanceCounter) // as a result using one lock for this critical section and another for Trace API critical sections // (such as Trace.WriteLine) could potentially lead to deadlock between 2 threads that are // executing these critical sections (and consequently obtaining the 2 locks) in the reverse order. // Using the same lock for DiagnosticsConfiguration as well as TraceInternal avoids this issue. // Sequential locks on TraceInternal.critSec by the same thread is a non issue for this critical section. lock (TraceInternal.critSec) { // because some of the code used to load config also uses diagnostics // we can't block them while we initialize from config. Therefore we just // return immediately and they just use the default values. if ( initState != InitState.NotInitialized || ConfigurationManagerInternalFactory.Instance.SetConfigurationSystemInProgress) { return; } initState = InitState.Initializing; // used for preventing recursion try { configSection = GetConfigSection(); } finally { initState = InitState.Initialized; } } } internal static void Refresh() { ConfigurationManager.RefreshSection("system.diagnostics"); // There might still be some persistant state left behind for // ConfigPropertyCollection (for ex, swtichelements), probably for perf. // We need to explicitly cleanup any unrecognized attributes that we // have added during last deserialization, so that they are re-added // during the next Config.GetSection properly and we get a chance to // populate the Attributes collection for re-deserialization. // Another alternative could be to expose the properties collection // directly as Attributes collection (currently we keep a local // hashtable which we explicitly need to keep in sycn and hence the // cleanup logic below) but the down side of that would be we need to // explicitly compute what is recognized Vs unrecognized from that // collection when we expose the unrecognized Attributes publically SystemDiagnosticsSection configSectionSav = configSection; if (configSectionSav != null) { if (configSectionSav.Switches != null) { foreach (SwitchElement swelem in configSectionSav.Switches) swelem.ResetProperties(); } if (configSectionSav.SharedListeners != null) { foreach (ListenerElement lnelem in configSectionSav.SharedListeners) lnelem.ResetProperties(); } if (configSectionSav.Sources != null) { foreach (SourceElement srelem in configSectionSav.Sources) srelem.ResetProperties(); } } configSection = null; initState = InitState.NotInitialized; Initialize(); } } }
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