TPluginManager and TFile

From: Joern Wuestenfeld <j.wuestenfeld_at_gsi.de>
Date: Mon, 8 Feb 2010 13:30:41 +0100

Hello,

I have a problem regarding the functionality of the plugin mechanism in ROOT. I'm using version 5.22 and have implemented a library supporting the RFIO mechanism for a special system. Now in my rootlogon.C I have the following two lines:

    gROOT->GetPluginManager()->AddHandler("TFile", "^rfio:", "HTRFIOFile","RFIOtsm","HTRFIOFile(const char*, Option_t *, const char *, Int_t)");

    gROOT->GetPluginManager()->AddHandler("TSystem", "^rfio:", "HTRFIOSystem","RFIOtsm","HTRFIOSystem()");

Once I startup ROOT, I get the following list of plugins:

---

Base                 Regexp        Class              Plugin


=====================================================================

TSystem              ^castor:      TRFIOSystem        RFIO [*]
TSystem              ^dcache:      TDCacheSystem      DCache [*]
TSystem              ^dcap:        TDCacheSystem      DCache [*]
TSystem              ^alien:       TAlienSystem       RAliEn [*]
TSystem              ^root:        TXNetSystem        Netx
TVirtualPad          *             TPad               Gpad
TVirtualX            x11           TGX11              GX11
TVirtualX            x11ttf        TGX11TTF           GX11TTF
TVirtualX            win32         TGWin32            Win32 [*]
TVirtualX            win32gdk      TGWin32            Win32gdk [*]
TVirtualX            qt            TGQt               GQt [*]
TGuiFactory          root          TRootGuiFactory    Gui
TGuiFactory          qt            TQtRootGuiFactory  QtRoot [*]
TFile                ^rfio:        HTRFIOFile         RFIOtsm
TSystem              ^rfio:        HTRFIOSystem       RFIOtsm


=====================================================================

15 plugin handlers registered
[*] 8 plugins not available

---

Now I try to open a file via the RFIO mecanism using TFile::Open:

TFile *f = TFile::Open("rfio://server/test.root","READ")

I get an error message as:

Error in <TUnixSystem::DynamicPathName>: RFIO[.so | .sl | .dl | .a | .dll] does not exist in .:.....

Now the list of plugins contains much more:

---

Base                 Regexp        Class              Plugin


=====================================================================

TSystem              ^castor:      TRFIOSystem        RFIO [*]
TSystem              ^dcache:      TDCacheSystem      DCache [*]
TSystem              ^dcap:        TDCacheSystem      DCache [*]
TSystem              ^alien:       TAlienSystem       RAliEn [*]
TSystem              ^root:        TXNetSystem        Netx
TVirtualPad          *             TPad               Gpad
TVirtualX            x11           TGX11              GX11
TVirtualX            x11ttf        TGX11TTF           GX11TTF
TVirtualX            win32         TGWin32            Win32 [*]
TVirtualX            win32gdk      TGWin32            Win32gdk [*]
TVirtualX            qt            TGQt               GQt [*]
TGuiFactory          root          TRootGuiFactory    Gui
TGuiFactory          qt            TQtRootGuiFactory  QtRoot [*]
TSystem              ^rfio:        HTRFIOSystem       RFIOtsm
TFile                ^http:        TWebFile           Net
TFile                ^rfio:        TRFIOFile          RFIO [*]
TFile                ^castor:      TCastorFile        RCastor [*]
TFile                ^dcache:      TDCacheFile        DCache [*]
TFile                ^dcap:        TDCacheFile        DCache [*]
TFile                ^gsidcap:     TDCacheFile        DCache [*]
TFile                ^gfal:        TGFALFile          GFAL [*]
TFile                ^chirp:       TChirpFile         Chirp [*]
TFile                ^alien:       TAlienFile         RAliEn [*]
TFile                .+[.]xml$     TXMLFile           XMLIO
TFile                ^mysql:       TSQLFile           SQL
TFile                ^oracle:      TSQLFile           SQL
TFile                ^root:        TXNetFile          Netx


=====================================================================

27 plugin handlers registered
[*] 16 plugins not available

---

And my plugin, which was available after startup is gone / replaced by the standard root plugin for rfio.
How can that happen? How can I prevent this. I did not find any option to the TPluginManager->AddHandler function, that would set a defined plugin static.

Hope to get some light onto this,

Jörn Received on Mon Feb 08 2010 - 13:30:48 CET