DiagnosticsConfiguration.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / 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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DiagnosticsConfiguration.cs source code in C# .NET

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