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| unit thMessageServer;
//msg server for thbackup - Adrien Reboisson
//
// rev 1. Seems to work.
interface
uses SysUtils, Classes, Contnrs, SyncObjs, IdBaseComponent, IdContext, IdComponent, IdTCPServer,
IdCmdTCPServer, libthmsgrintf;
type
TThMessageBinding = class
private
FMessage: string;
FOnExecute: TThMessageCallbackProc;
public
property MessageHandled: string read FMessage write FMessage;
property OnExecute: TThMessageCallbackProc read FOnExecute write FOnExecute;
function TryExecute(const AMessageContent: string): Boolean;
constructor Create(AMessage: string; AHandler: TThMessageCallbackProc);
end;
TThMessagesList = class (TObjectList)
private
FLock: TCriticalSection;
function Find(const S: string; var Index: Integer): Boolean;
function GetItem(Index: Integer): TThMessageBinding;
procedure SetItem(Index: Integer; const Value: TThMessageBinding);
public
function HookMessage(const AMessage: string; AHandler: TThMessageCallbackProc): Boolean;
function UnhookMessage(const AMessage: string): Boolean;
function Execute(const AMessage, AContent: string): Boolean;
property Items[Index: Integer]: TThMessageBinding read GetItem write SetItem; default;
procedure Lock;
procedure Unlock;
constructor Create;
destructor Destroy; override;
end;
TThMessageServer = class (TIdTCPServer)
private
FMessagesList: TThMessagesList;
FID: Integer;
public
procedure MessageRcvHandler(AContext: TIdContext);
constructor Create;
destructor Destroy; override;
property ID: Integer read FID write FID;
property MessagesList: TThMessagesList read FMessagesList write FMessagesList;
end;
TThServersList = class (TObjectList)
private
FLock: TCriticalSection;
FHandleGenerator: Integer;
function GetItem(Index: Integer): TThMessageServer;
procedure SetItem(Index: Integer; const Value: TThMessageServer);
function Find(const S: Integer; var Index: Integer): Boolean;
public
property Items[Index: Integer]: TThMessageServer read GetItem write SetItem; default;
constructor Create;
destructor Destroy; override;
function CreateServer(const APort: Integer; const AAddress: string): Integer;
function FreeServer(const AServerHandle: Integer): Boolean;
function HookMessage(const AServerHandle: Integer; AMessage: string; AProc: Pointer): Boolean;
function UnhookMessage(const AServerHandle: Integer; AMessage: string): Boolean;
end;
var
GServersList: TThServersList = nil;
implementation
uses IdSocketHandle;
{ TThMessageServer }
constructor TThMessageServer.Create;
begin
inherited Create;
OnExecute := MessageRcvHandler;
FMessagesList := TThMessagesList.Create;
end;
destructor TThMessageServer.Destroy;
begin
try
Active := False;
FMessagesList.Free;
inherited;
except
end;
end;
procedure TThMessageServer.MessageRcvHandler(AContext: TIdContext);
var
I : Integer;
LLine, LMessage, LMessageContent: string;
begin
LLine := Trim(AContext.Connection.IOHandler.ReadLn);
I := Pos(' ', LLine);
if I > 0 then
begin
LMessage := Copy(LLine, 1, I - 1);
LMessageContent := Copy(LLine, I + 1, Length(LLine));
FMessagesList.Execute(LMessage, LMessageContent);
end;
end;
{ TThMessageBinding }
constructor TThMessageBinding.Create(AMessage: string;
AHandler: TThMessageCallbackProc);
begin
inherited Create;
FMessage := AMessage;
FOnExecute := AHandler;
end;
function TThMessageBinding.TryExecute(const AMessageContent: string): Boolean;
begin
if Assigned(FOnExecute) then
begin
Result := True;
FOnExecute(PChar(FMessage), PChar(AMessageContent));
end else
Result := False;
end;
{ TThMessagesList }
constructor TThMessagesList.Create;
begin
inherited Create;
FLock := TCriticalSection.Create;
end;
destructor TThMessagesList.Destroy;
begin
FLock.Free;
inherited;
end;
function TThMessagesList.Execute(const AMessage,
AContent: string): Boolean;
var
I: Integer;
begin
Lock;
try
if Find(AMessage, I) then
Result := Items[I].TryExecute(AContent)
else
Result := False;
finally
Unlock;
end;
end;
function TThMessagesList.Find(const S: string;
var Index: Integer): Boolean;
var
L, H, I : Integer;
C: Integer;
begin
{ Warning: the list must be locked before calling Find() }
Result := False;
L := 0;
H := Count - 1;
while L <= H do
begin
I := (L + H) shr 1;
C := CompareStr(Items[I].MessageHandled, S);
if C < 0 then L := I + 1 else
begin
H := I - 1;
if C = 0 then
begin
Result := True;
L := I;
Break;
end;
end;
end;
Index := L;
end;
function TThMessagesList.GetItem(Index: Integer): TThMessageBinding;
begin
Result := TThMessageBinding(inherited GetItem(Index));
end;
function TThMessagesList.HookMessage(const AMessage: string;
AHandler: TThMessageCallbackProc): Boolean;
var
I: Integer;
S: TThMessageBinding;
begin
Lock;
try
if Find(AMessage, I) then
Result := False { Already inserted }
else
begin
S := TThMessageBinding.Create(AMessage, AHandler);
Insert(I, S);
Result := True;
end;
finally
Unlock;
end;
end;
procedure TThMessagesList.Lock;
begin
FLock.Acquire;
end;
procedure TThMessagesList.SetItem(Index: Integer;
const Value: TThMessageBinding);
begin
inherited SetItem(Index, Value);
end;
function TThMessagesList.UnhookMessage(const AMessage: string): Boolean;
var
I: Integer;
begin
Lock;
try
if Find(AMessage, I) then
begin
Delete(I);
Result := True;
end
else
Result := False;
finally
Unlock;
end;
end;
procedure TThMessagesList.Unlock;
begin
FLock.Release;
end;
{ TThServersList }
constructor TThServersList.Create;
begin
FLock := TCriticalSection.Create;
FHandleGenerator := 0;
inherited;
end;
function TThServersList.CreateServer(const APort: Integer; const AAddress: string): Integer;
var
S: TThMessageServer;
I: Integer;
begin
Result := -1;
S := nil;
FLock.Acquire;
try
Inc(FHandleGenerator);
try
if not Find(FHandleGenerator, I) then
begin
S := TThMessageServer.Create;
S.DefaultPort := APort;
with S.Bindings.Add do
begin
IP := AAddress;
Port := APort;
end;
S.Active := True;
S.ID := FHandleGenerator;
Insert(I, S);
Result := S.ID;
end else
Result := -1;
except
if (S <> nil) then
FreeAndNil(S);
end;
finally
FLock.Release;
end;
end;
destructor TThServersList.Destroy;
begin
FLock.Free;
inherited;
end;
function TThServersList.Find(const S: Integer;
var Index: Integer): Boolean;
var
L, H, I : Integer;
C: Integer;
begin
{ Warning: the list must be locked before calling Find() }
Result := False;
L := 0;
H := Count - 1;
while L <= H do
begin
I := (L + H) shr 1;
C := Items[I].ID - S;
if C < 0 then L := I + 1 else
begin
H := I - 1;
if C = 0 then
begin
Result := True;
L := I;
Break;
end;
end;
end;
Index := L;
end;
function TThServersList.FreeServer(const AServerHandle: Integer): Boolean;
var
I: Integer;
begin
Result := False;
FLock.Acquire;
try
if Find(AServerHandle, I) then
begin
Items[I].Active := False;
Delete(I);
Result := True;
end;
finally
FLock.Release;
end;
end;
function TThServersList.GetItem(Index: Integer): TThMessageServer;
begin
Result := TThMessageServer(inherited GetItem(Index));
end;
function TThServersList.HookMessage(const AServerHandle: Integer;
AMessage: string; AProc: Pointer): Boolean;
var
I: Integer;
begin
Result := False;
FLock.Acquire;
try
if Find(AServerHandle, I) then
Result := Items[I].MessagesList.HookMessage(AMessage, TThMessageCallbackProc(AProc));
finally
FLock.Release;
end;
end;
procedure TThServersList.SetItem(Index: Integer;
const Value: TThMessageServer);
begin
inherited SetItem(Index, Value);
end;
function TThServersList.UnhookMessage(const AServerHandle: Integer;
AMessage: string): Boolean;
var
I: Integer;
begin
Result := False;
FLock.Acquire;
try
if Find(AServerHandle, I) then
Result := Items[I].MessagesList.UnhookMessage(AMessage);
finally
FLock.Release;
end;
end;
initialization
GServersList := TThServersList.Create;
finalization
if Assigned(GServersList) then
FreeAndNil(GServersList);
end. |
Partager