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FileTracerAgent.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
FileTracerAgent;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
Classes,
SyncObjs,
FileIO,
Tracer;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TFileTracerAgent = class(TInterfacedObject, ITracerAgent)
private
InError: Boolean;
private
Lock: TCriticalSection;
private
FileStream: TBufferedSequentialWriteStream;
public
constructor Create(FileName: String);
procedure RenderTrace(TimeStamp: TDateTime; Priority: TracePriority; const Message: String);
procedure RenderWrite(const Message: String);
procedure CloseTrace;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
SysUtils,
Windows;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TFileTracerAgent.Create(FileName: String);
begin
inherited Create;
Self.Lock := TCriticalSection.Create;
try Self.FileStream := TBufferedSequentialWriteStream.Create(FileName, True, BUFFERED_SEQUENTIAL_STREAM_256KB_BUFFER_SIZE); except Self.InError := True; end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TFileTracerAgent.RenderTrace(TimeStamp: TDateTime; Priority: TracePriority; const Message: String);
var
Line: String;
begin
// Determine what to log out of the lock for performance reasons
if (Priority = TracePriorityInfo) then Line := FormatDateTime('yyyy-MM-dd HH":"mm":"ss.zzz', TimeStamp) + ' [I] ' + Message + #13#10 else if (Priority = TracePriorityWarning) then Line := FormatDateTime('yyyy-MM-dd HH":"mm":"ss.zzz', TimeStamp) + ' [W] ' + Message + #13#10 else if (Priority = TracePriorityError) then Line := FormatDateTime('yyyy-MM-dd HH":"mm":"ss.zzz', TimeStamp) + ' [E] ' + Message + #13#10 else Line := FormatDateTime('yyyy-MM-dd HH":"mm":"ss.zzz', TimeStamp) + ' [?] ' + Message + #13#10;
// Tracing is wrapped around a critical section for thread-safety
Self.Lock.Acquire; try try if not(Self.InError) then if not(Self.FileStream.WriteString(Line)) then Self.InError := True; except Self.InError := True; end; finally Self.Lock.Release; end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TFileTracerAgent.RenderWrite(const Message: String);
begin
// Tracing is wrapped around a critical section for thread-safety
Self.Lock.Acquire; try try if not(Self.InError) then if not(Self.FileStream.WriteString(Message)) then Self.InError := True; except Self.InError := True; end; finally Self.Lock.Release; end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TFileTracerAgent.CloseTrace;
begin
if (Self.FileStream <> nil) then begin try if not(Self.FileStream.Flush) then Self.InError := True; except Self.InError := True; end; Self.FileStream.Free; end;
if (Self.Lock <> nil) then Self.Lock.Free;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
end.