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Tracer.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
Tracer;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TracePriority = (TracePriorityInfo, TracePriorityWarning, TracePriorityError, TracePriorityNone);
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
ITracerAgent = interface(IInterface)
procedure RenderTrace(TimeStamp: TDateTime; Priority: TracePriority; const Message: String);
procedure RenderWrite(const Message: String);
procedure CloseTrace;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TTracer = class
public
class procedure Initialize;
class procedure Finalize;
public
class function IsEnabled: Boolean;
class procedure SetTracerAgent(TracerAgent: ITracerAgent);
class procedure SetMinimumTracingPriority(Priority: TracePriority);
public
class procedure Trace(Priority: TracePriority; const Message: String);
class procedure Write(Priority: TracePriority; const Message: String);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
SysUtils;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
var TTracer_Enabled: Boolean;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
var
TTracer_TracerAgent: ITracerAgent;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
var
TTracer_MinimumTracingPriority: TracePriority;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.Initialize;
begin
TTracer_Enabled := False; TTracer_TracerAgent := nil; TTracer_MinimumTracingPriority := TracePriorityInfo;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class function TTracer.IsEnabled: Boolean;
begin
Result := TTracer_Enabled;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.SetTracerAgent(TracerAgent: ITracerAgent);
begin
if (TTracer_TracerAgent <> nil) then TTracer_TracerAgent.CloseTrace; TTracer_TracerAgent := TracerAgent; TTracer_Enabled := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.SetMinimumTracingPriority(Priority: TracePriority);
begin
TTracer_MinimumTracingPriority := Priority;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.Trace(Priority: TracePriority; const Message: String);
begin
if (TTracer_TracerAgent <> nil) then begin
if (Priority >= TTracer_MinimumTracingPriority) then TTracer_TracerAgent.RenderTrace(Now, Priority, Message);
end else begin
raise Exception.Create('TTracer.Trace: The tracer agent must be set before calling this method.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.Write(Priority: TracePriority; const Message: String);
begin
if (TTracer_TracerAgent <> nil) then begin
if (Priority >= TTracer_MinimumTracingPriority) then TTracer_TracerAgent.RenderWrite(Message);
end else begin
raise Exception.Create('TTracer.Write: The tracer agent must be set before calling this method.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TTracer.Finalize;
begin
if (TTracer_TracerAgent <> nil) then TTracer_TracerAgent.CloseTrace; TTracer_Enabled := False; TTracer_TracerAgent := nil;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
begin
TTracer_Enabled := False;
end.