IROObjectActivation

Overview

The IROObjectActivation interface is used by the the Remoting SDK to allow service implementations to be notified for activation and deactivation (i.e. before and after they will be asked to serve a remote request). The TROInvoker takes care of it in the TROInvoker and TROInvoker methods.

Depending on your needs, you can use these events to load persist session data, perform cleanup, etc.

Use case

To utilize this possibility you have to add the IROObjectActivation interface to the implementation of your service.

   
  IMyService = IInterface;

  TMyService = class(TRORemotable, IMyService, IROObjectActivation)
  private
  protected
    //IROObjectActivation
    procedure OnActivate(aClientID: TGUID; const aMessage : IROMessage);
    procedure OnDeactivate(aClientID: TGUID);
    { IMyService methods }
    //...
    procedure SomeMethod;
  end;
  
{ TMyService }
procedure TMyService.OnActivate(aClientID: TGUID; const aMessage: IROMessage);
begin
  WriteLn ('OnActivate called');
end;

procedure TMyService.OnDeactivate(aClientID: TGUID);
begin
  WriteLn ('OnDeactivate called');
end;

Location

Implemented in

Required Methods


OnActivate

Called just after the service is created and before any service method is called.

procedure OnActivate(aClientID: TGUID; const aMessage: IROMessage)

Parameters:

  • aClientID: Client ID
  • aMessage: Message

OnDeactivate

Called after the service method completes and before the service instance is freed.

procedure OnDeactivate(aClientID: TGUID)

Parameters:

  • aClientID: Client ID

See Also