C# Action.Debounce方法代码示例

        internal DotNetFunctionInvoker(ScriptHost host, FunctionMetadata functionMetadata,
            Collection<FunctionBinding> inputBindings, Collection<FunctionBinding> outputBindings,
            IFunctionEntryPointResolver functionEntryPointResolver, FunctionAssemblyLoader assemblyLoader,
            ICompilationServiceFactory compilationServiceFactory, ITraceWriterFactory traceWriterFactory = null)
            : base(host, functionMetadata, traceWriterFactory)
        {
            _metricsLogger = Host.ScriptConfig.HostConfig.GetService<IMetricsLogger>();
            _functionEntryPointResolver = functionEntryPointResolver;
            _assemblyLoader = assemblyLoader;
            _metadataResolver = new FunctionMetadataResolver(functionMetadata, host.ScriptConfig.BindingProviders, TraceWriter);
            _compilationService = compilationServiceFactory.CreateService(functionMetadata.ScriptType, _metadataResolver);
            _inputBindings = inputBindings;
            _outputBindings = outputBindings;
            _triggerInputName = functionMetadata.Bindings.FirstOrDefault(b => b.IsTrigger).Name;

            InitializeFileWatcher();

            _resultProcessor = CreateResultProcessor();

            _functionLoader = new FunctionLoader<MethodInfo>(CreateFunctionTarget);

            _reloadScript = ReloadScript;
            _reloadScript = _reloadScript.Debounce();

            _restorePackages = RestorePackages;
            _restorePackages = _restorePackages.Debounce();
        }

        internal CSharpFunctionInvoker(ScriptHost host, FunctionMetadata functionMetadata,
            Collection<FunctionBinding> inputBindings, Collection<FunctionBinding> outputBindings,
            IFunctionEntryPointResolver functionEntryPointResolver, FunctionAssemblyLoader assemblyLoader)
            : base(host, functionMetadata)
        {
            _host = host;
            _functionEntryPointResolver = functionEntryPointResolver;
            _assemblyLoader = assemblyLoader;
            _metadataResolver = new FunctionMetadataResolver(functionMetadata, TraceWriter);
            _inputBindings = inputBindings;
            _outputBindings = outputBindings;
            _triggerInputName = GetTriggerInputName(functionMetadata);
            _metrics = host.ScriptConfig.HostConfig.GetService<IMetricsLogger>();

            InitializeFileWatcherIfEnabled();
            _resultProcessor = CreateResultProcessor();

            _functionValueLoader = FunctionValueLoader.Create(CreateFunctionTarget);

            _reloadScript = ReloadScript;
            _reloadScript = _reloadScript.Debounce();

            _restorePackages = RestorePackages;
            _restorePackages = _restorePackages.Debounce();
        }

        protected ScriptHost(ScriptHostConfiguration scriptConfig) 
            : base(scriptConfig.HostConfig)
        {
            ScriptConfig = scriptConfig;

            if (scriptConfig.FileLoggingEnabled)
            {
                string hostLogFilePath = Path.Combine(scriptConfig.RootLogPath, "Host");
                _traceWriter = new FileTraceWriter(hostLogFilePath, TraceLevel.Verbose);
                scriptConfig.HostConfig.Tracing.Tracers.Add(_traceWriter);
            }
            else
            {
                _traceWriter = NullTraceWriter.Instance;
            }

            if (scriptConfig.TraceWriter != null)
            {
                scriptConfig.HostConfig.Tracing.Tracers.Add(scriptConfig.TraceWriter);
            }
            else
            {
                scriptConfig.TraceWriter = NullTraceWriter.Instance;
            }

            if (scriptConfig.FileWatchingEnabled)
            {
                _fileWatcher = new FileSystemWatcher(scriptConfig.RootScriptPath)
                {
                    IncludeSubdirectories = true,
                    EnableRaisingEvents = true
                };
                _fileWatcher.Changed += OnFileChanged;
                _fileWatcher.Created += OnFileChanged;
                _fileWatcher.Deleted += OnFileChanged;
                _fileWatcher.Renamed += OnFileChanged;
            }

            // If a file change should result in a restart, we debounce the event to
            // ensure that only a single restart is triggered within a specific time window.
            // This allows us to deal with a large set of file change events that might
            // result from a bulk copy/unzip operation. In such cases, we only want to
            // restart after ALL the operations are complete and there is a quiet period.
            _restart = (e) =>
            {
                _traceWriter.Verbose(string.Format("File change of type '{0}' detected for '{1}'", e.ChangeType, e.FullPath));
                _traceWriter.Verbose("Host configuration has changed. Signaling restart.");

                // signal host restart
                _restartEvent.Set();
            };
            _restart = _restart.Debounce(500);

            // take a snapshot so we can detect function additions/removals
            _directoryCountSnapshot = Directory.EnumerateDirectories(ScriptConfig.RootScriptPath).Count();
        }

        protected virtual void Initialize()
        {
            // read host.json and apply to JobHostConfiguration
            string hostConfigFilePath = Path.Combine(ScriptConfig.RootScriptPath, HostConfigFileName);

            // If it doesn't exist, create an empty JSON file
            if (!File.Exists(hostConfigFilePath))
            {
                File.WriteAllText(hostConfigFilePath, "{}");
            }

            if (ScriptConfig.HostConfig.IsDevelopment)
            {
                ScriptConfig.HostConfig.UseDevelopmentSettings();
            }
            else
            {
                // TEMP: Until https://github.com/Azure/azure-webjobs-sdk-script/issues/100 is addressed
                // we're using some presets that are a good middle ground
                ScriptConfig.HostConfig.Queues.MaxPollingInterval = TimeSpan.FromSeconds(10);
                ScriptConfig.HostConfig.Singleton.ListenerLockPeriod = TimeSpan.FromSeconds(15);
            }

            string json = File.ReadAllText(hostConfigFilePath);
            JObject hostConfig = JObject.Parse(json);
            ApplyConfiguration(hostConfig, ScriptConfig);

            // Set up a host level TraceMonitor that will receive notificaition
            // of ALL errors that occur. This allows us to inspect/log errors.
            var traceMonitor = new TraceMonitor()
                .Filter(p => { return true; })
                .Subscribe(HandleHostError);
            ScriptConfig.HostConfig.Tracing.Tracers.Add(traceMonitor);

            if (ScriptConfig.FileLoggingEnabled)
            {
                string hostLogFilePath = Path.Combine(ScriptConfig.RootLogPath, "Host");
                TraceWriter = new FileTraceWriter(hostLogFilePath, TraceLevel.Verbose);
                ScriptConfig.HostConfig.Tracing.Tracers.Add(TraceWriter);
            }
            else
            {
                TraceWriter = NullTraceWriter.Instance;
            }

            TraceWriter.Verbose(string.Format(CultureInfo.InvariantCulture, "Reading host configuration file '{0}'", hostConfigFilePath));

            if (ScriptConfig.TraceWriter != null)
            {
                ScriptConfig.HostConfig.Tracing.Tracers.Add(ScriptConfig.TraceWriter);
            }
            else
            {
                ScriptConfig.TraceWriter = NullTraceWriter.Instance;
            }

            if (ScriptConfig.FileWatchingEnabled)
            {
                _fileWatcher = new FileSystemWatcher(ScriptConfig.RootScriptPath)
                {
                    IncludeSubdirectories = true,
                    EnableRaisingEvents = true
                };
                _fileWatcher.Changed += OnFileChanged;
                _fileWatcher.Created += OnFileChanged;
                _fileWatcher.Deleted += OnFileChanged;
                _fileWatcher.Renamed += OnFileChanged;
            }

            // If a file change should result in a restart, we debounce the event to
            // ensure that only a single restart is triggered within a specific time window.
            // This allows us to deal with a large set of file change events that might
            // result from a bulk copy/unzip operation. In such cases, we only want to
            // restart after ALL the operations are complete and there is a quiet period.
            _restart = (e) =>
            {
                TraceWriter.Verbose(string.Format(CultureInfo.InvariantCulture, "File change of type '{0}' detected for '{1}'", e.ChangeType, e.FullPath));
                TraceWriter.Verbose("Host configuration has changed. Signaling restart.");

                // signal host restart
                _restartEvent.Set();
            };
            _restart = _restart.Debounce(500);

            // take a snapshot so we can detect function additions/removals
            _directoryCountSnapshot = Directory.EnumerateDirectories(ScriptConfig.RootScriptPath).Count();

            var dashboardString = AmbientConnectionStringProvider.Instance.GetConnectionString(ConnectionStringNames.Dashboard);

            var config = ScriptConfig.HostConfig;
            if (dashboardString != null)
            {
                var fastLogger = new FastLogger(dashboardString);
                config.AddService<IAsyncCollector<FunctionInstanceLogEntry>>(fastLogger);
            }
            config.DashboardConnectionString = null; // disable slow logging 

            IMetricsLogger metricsLogger = ScriptConfig.HostConfig.GetService<IMetricsLogger>();
            if (metricsLogger == null)
            {
//.........这里部分代码省略.........

//.........这里部分代码省略.........
                    TraceWriter = new ConsoleTraceWriter(hostTraceLevel);
                }

                _debugModeFileWatcher = new AutoRecoveringFileSystemWatcher(hostLogPath, ScriptConstants.DebugSentinelFileName,
                    includeSubdirectories: false, changeTypes: WatcherChangeTypes.Created | WatcherChangeTypes.Changed);
                
                _debugModeFileWatcher.Changed += OnDebugModeFileChanged;

                var storageString = AmbientConnectionStringProvider.Instance.GetConnectionString(ConnectionStringNames.Storage);
                Task<BlobLeaseManager> blobManagerCreation = null;
                if (storageString == null)
                {
                    // Disable core storage 
                    ScriptConfig.HostConfig.StorageConnectionString = null;
                    blobManagerCreation = Task.FromResult<BlobLeaseManager>(null);
                }
                else
                {
                    blobManagerCreation = BlobLeaseManager.CreateAsync(storageString, TimeSpan.FromSeconds(15), ScriptConfig.HostConfig.HostId, InstanceId, TraceWriter);
                }

                var bindingProviders = LoadBindingProviders(ScriptConfig, hostConfig, TraceWriter);
                ScriptConfig.BindingProviders = bindingProviders;

                TraceWriter.Info(string.Format(CultureInfo.InvariantCulture, "Reading host configuration file '{0}'", hostConfigFilePath));

                if (ScriptConfig.FileWatchingEnabled)
                {
                    _scriptFileWatcher = new AutoRecoveringFileSystemWatcher(ScriptConfig.RootScriptPath);

                    _scriptFileWatcher.Changed += OnFileChanged;
                }

                // If a file change should result in a restart, we debounce the event to
                // ensure that only a single restart is triggered within a specific time window.
                // This allows us to deal with a large set of file change events that might
                // result from a bulk copy/unzip operation. In such cases, we only want to
                // restart after ALL the operations are complete and there is a quiet period.
                _restart = (e) =>
                {
                    TraceWriter.Info(string.Format(CultureInfo.InvariantCulture, "File change of type '{0}' detected for '{1}'", e.ChangeType, e.FullPath));
                    TraceWriter.Info("Host configuration has changed. Signaling restart.");
                    RestartHost();
                };
                _restart = _restart.Debounce(500);

                // take a snapshot so we can detect function additions/removals
                _directoryCountSnapshot = Directory.EnumerateDirectories(ScriptConfig.RootScriptPath).Count();

                List<FunctionDescriptorProvider> descriptionProviders = new List<FunctionDescriptorProvider>()
                {
                    new ScriptFunctionDescriptorProvider(this, ScriptConfig),
                    new NodeFunctionDescriptorProvider(this, ScriptConfig),
                    new DotNetFunctionDescriptorProvider(this, ScriptConfig),
                    new PowerShellFunctionDescriptorProvider(this, ScriptConfig)
                };

                // Allow BindingProviders to initialize
                foreach (var bindingProvider in ScriptConfig.BindingProviders)
                {
                    try
                    {
                        bindingProvider.Initialize();
                    }
                    catch (Exception ex)
                    {
                        // If we're unable to initialize a binding provider for any reason, log the error
                        // and continue
                        TraceWriter.Error(string.Format("Error initializing binding provider '{0}'", bindingProvider.GetType().FullName), ex);
                    }
                }

                // Create the lease manager that will keep handle the primary host blob lease acquisition and renewal 
                // and subscribe for change notifications.
                _blobLeaseManager = blobManagerCreation.GetAwaiter().GetResult();
                if (_blobLeaseManager != null)
                {
                    _blobLeaseManager.HasLeaseChanged += BlobLeaseManagerHasLeaseChanged;
                }

                // read all script functions and apply to JobHostConfiguration
                Collection<FunctionDescriptor> functions = ReadFunctions(descriptionProviders);
                Collection<CustomAttributeBuilder> typeAttributes = CreateTypeAttributes(ScriptConfig);
                string defaultNamespace = "Host";
                string typeName = string.Format(CultureInfo.InvariantCulture, "{0}.{1}", defaultNamespace, "Functions");
                TraceWriter.Info(string.Format(CultureInfo.InvariantCulture, "Generating {0} job function(s)", functions.Count));
                Type type = FunctionGenerator.Generate(HostAssemblyName, typeName, typeAttributes, functions);
                List<Type> types = new List<Type>();
                types.Add(type);

                ScriptConfig.HostConfig.TypeLocator = new TypeLocator(types);

                Functions = functions;

                if (ScriptConfig.FileLoggingMode != FileLoggingMode.Never)
                {
                    PurgeOldLogDirectories();
                }
            }
        }