/// <summary>
/// Returns the <see cref="IEntryWriter{TEntry}" /> matching with the specified <see cref="ILogWriterConfig" />.
/// </summary>
/// <typeparam name="TEntry">The logentry type written by the returned <see cref="IEntryWriter{TEntry}" />.</typeparam>
/// <param name="logWriterConfig">An <see cref="ILogWriterConfig" /> instance.</param>
/// <returns>
/// An <see cref="IEntryWriter{TEntry}" /> for <paramref name="logWriterConfig" /> and of entry type
/// <typeparamref name="TEntry" />.
/// If the <c>logWriterConfig</c> is valid, but the log writer failed to start or doesn't contain an entry writer of the
/// specified type,
/// a <see cref="NoOpEntryWriter{TEntry}" /> is returned.
/// </returns>
/// <exception cref="KeyNotFoundException">
/// If no value in <c>Config.Writers</c> is equal to
/// <paramref name="logWriterConfig" />
/// </exception>
/// <remarks>
/// This method throws exceptions if the call is invalid, but
/// does not throw an exception if the returned logwriter failed to start.
/// </remarks>
public IEntryWriter <TEntry> GetEntryWriter <TEntry>(ILogWriterConfig logWriterConfig) where TEntry : ILogEntry
{
Contract.Requires <ArgumentNullException>(logWriterConfig != null);
ILogWriter logWriter = null;
logWriter = GetLogWriter(logWriterConfig);
if (logWriter == null)
{ // This occurs when entryWriter.Start() fails. In this case, the desired behavior is to return a functioning logwriter.
var tracer = SetupTracerFactory.TracerFor(this);
tracer.Warn("Returning a NoOpEntryWriter<{0}> for log writer config: {1} - check start errors.", typeof(TEntry).Name, logWriterConfig);
return(new NoOpEntryWriter <TEntry>());
}
IEntryWriter <TEntry> entryWriter;
if (!logWriter.TryGetEntryWriter(out entryWriter))
{
var tracer = SetupTracerFactory.TracerFor(this);
tracer.Warn("Returning a NoOpEntryWriter<{0}> for log writer {1} - log writer did not contain an entry writer for log entry type {0}.",
typeof(TEntry).Name,
logWriterConfig);
return(new NoOpEntryWriter <TEntry>());
}
return(entryWriter);
}
protected virtual void Dispose(bool disposing)
{
if (!IsDisposed)
{
Stop();
// Protect against recursion (eg linked disposables could create a cycle)
_startableState = StartableState.Disposed;
if (disposing)
{
// Dispose all the linked disposables
foreach (var disposable in _linkedDisposables)
{
if (disposable != null)
{
try
{
disposable.Dispose();
}
catch (ObjectDisposedException)
{} // No need to log this
catch (Exception exception)
{
var tracer = SetupTracerFactory.TracerFor(this);
tracer.Error(exception, "Exception while disposing " + disposable + ".");
}
}
}
_linkedDisposables.Clear();
}
}
}
/// <summary>
/// Create an <see cref="ILogWriter" /> from <paramref name="logWriterConfig" />, then proxy it as configured and log any
/// errors in <see cref="SetupLog" />.
/// </summary>
/// <param name="logWriterConfig"></param>
/// <returns></returns>
internal ILogWriter CreateLogWriter(ILogWriterConfig logWriterConfig)
{
ILogWriter logWriter = null;
try
{
logWriter = logWriterConfig.CreateLogWriter(SetupTracerFactory);
if (logWriterConfig.BackgroundLogging)
{
var backgroundWriter = new BackgroundMultiLogWriter(SetupTracerFactory);
_backgroundMultiLogWriters.Add(backgroundWriter);
logWriter = backgroundWriter.CreateProxyFor(logWriter);
backgroundWriter.Start();
}
else if (!logWriter.IsSynchronized && logWriterConfig.Synchronized)
{
// Wrap non-synchronized LogWriters to make them threadsafe
logWriter = new SynchronizingProxyLogWriter(SetupTracerFactory, logWriter);
}
}
catch (Exception excp)
{
// TODO: Store initialization failure status
var tracer = SetupTracerFactory.TracerFor(logWriterConfig);
tracer.Severe(excp, "Exception creating logwriter from config: {0}", logWriterConfig);
logWriter = null;
}
return(logWriter);
}
protected override void InternalStart()
{
lock (this)
{
if (_logManager.IsRestartNeeded())
{
// Restart the LogManager to pick up any config changes
_logManager.Start();
}
else
{
// No config changes needed, just start it if not already started
_logManager.EnsureAutoStarted();
}
// Create all the TraceWriters associated with each config entry
_activeTraceEntryWriters.Clear();
foreach (TraceWriterConfig traceWriterConfig in Config.Writers)
{
try
{
IEntryWriter <TraceEntry> traceEntryWriter = LogManager.GetEntryWriter <TraceEntry>(traceWriterConfig.LogWriterConfig);
_activeTraceEntryWriters.Add(new Tuple <TraceWriterConfig, IEntryWriter <TraceEntry> >(traceWriterConfig, traceEntryWriter));
}
catch (Exception excp)
{
SetupTracerFactory.TracerFor(this)
.Error(excp, "Couldn't setup Tracing to target {0} due to exception getting IEntryWriter<TraceEntry>.", traceWriterConfig.LogWriterConfig);
}
}
// Reset TraceWriter for each Tracer
ForEachTracer(tracer => tracer.Configure(GetTraceWritersFor(tracer.Name)));
}
}
/// <summary>
/// Stops this instance; closes all disposables.
/// </summary>
public void Stop()
{
if (IsStopped || (_startableState == StartableState.Unstarted) || (_startableState == StartableState.Stopping))
{
return;
}
var tracer = SetupTracerFactory.TracerFor(this);
string className = GetType().Name;
tracer.Info("Stopping " + className + "...");
try
{
_startableState = StartableState.Stopping;
InternalStop();
_startableState = StartableState.Stopped;
}
catch (Exception stopException)
{
_startException = stopException;
tracer.Error(stopException, "Stop failed: Exception occurred.");
_startableState = StartableState.FailedToStop;
}
foreach (var disposableRef in _disposeOnStop)
{
IDisposable disposable = disposableRef.Target as IDisposable;
if (disposable != null)
{
try
{
disposable.Dispose();
}
catch (ObjectDisposedException)
{} // No need to log this
catch (Exception exception)
{
tracer.Error(exception, "Exception while disposing " + disposable + ".");
}
}
}
_disposeOnStop.Clear();
tracer.Info(className + " stopped.");
}
protected override void InternalStart()
{
lock (this)
{
var logManagerTracer = SetupTracerFactory.TracerFor(this);
if (_logWriters.Count > 0)
{
logManagerTracer.Debug("Stopping LogManager before re-starting it...");
Stop();
}
foreach (ILogWriterConfig logWriterConfig in Config.Writers)
{
if (_logWriters.ContainsKey(logWriterConfig))
{
// Occurs when the logWriterConfig already exists - this shouldn't happen
var tracer = SetupTracerFactory.TracerFor(logWriterConfig);
tracer.Severe("LogWriterConfig {0} is already active - this shouldn't happen. Skipping it...", logWriterConfig);
continue;
}
ILogWriter logWriter = CreateLogWriter(logWriterConfig);
if (logWriter != null)
{
(logWriter as IStartable).SafeStart(SetupTracerFactory);
_logWriters.Add(logWriterConfig, logWriter);
if (logWriterConfig.DisposeOnStop)
{
DisposeOnStop(logWriter);
}
}
}
}
}
/// <summary>
/// Resets this instance, to start new as an unconfigured instance with no memory of the past.
/// </summary>
/// <param name="clearSetupLog">If <c>true</c>, the contents of the <see cref="SetupTracerFactory" /> are cleared.</param>
public void Reset(bool clearSetupLog)
{
lock (this)
{
var tracer = SetupTracerFactory.TracerFor(this);
tracer.Info("Resetting... ");
Stop();
if (clearSetupLog)
{
var setupTracerFactory = SetupTracerFactory as SetupLog;
if (setupTracerFactory != null)
{
setupTracerFactory.Clear();
}
}
InternalReset();
tracer.Info("Completed Reset. ");
}
}
/// <summary>
/// Starts the manager whether or not <c>Start()</c> has already been called.
/// </summary>
/// <remarks>To avoid starting more than once, use <see cref="EnsureAutoStarted" />.</remarks>
public void Start()
{
var tracer = SetupTracerFactory.TracerFor(this);
string className = GetType().Name;
if (IsDisposed)
{
tracer.Error(className + " cannot be started; it has been Dispose()ed.");
return;
}
var state = _startableState;
if ((state == StartableState.Starting) || (state == StartableState.Stopping))
{
tracer.Error(className + " cannot be started; state is: " + state);
return;
}
tracer.Debug("Starting " + className + "...");
lock (this)
{
try
{
_startableState = StartableState.Starting;
InternalStart();
_startableState = StartableState.Started;
tracer.Info(className + " started.");
}
catch (Exception startException)
{
_startException = startException;
tracer.Error(startException, "Start failed: Exception occurred.");
_startableState = StartableState.FailedToStart;
}
}
}
