GSI Object Oriented Online Offline (Go4): Go4ObjectManager/TGo4LinkProxy.cxx Source File

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00001 // $Id: TGo4LinkProxy.cxx 478 2009-10-29 12:26:09Z linev $
00002 //-----------------------------------------------------------------------
00003 //       The GSI Online Offline Object Oriented (Go4) Project
00004 //         Experiment Data Processing at EE department, GSI
00005 //-----------------------------------------------------------------------
00006 // Copyright (C) 2000- GSI Helmholtzzentrum f�r Schwerionenforschung GmbH
00007 //                     Planckstr. 1, 64291 Darmstadt, Germany
00008 // Contact:            http://go4.gsi.de
00009 //-----------------------------------------------------------------------
00010 // This software can be used under the license agreements as stated
00011 // in Go4License.txt file which is part of the distribution.
00012 //-----------------------------------------------------------------------
00013 
00014 #include "TGo4LinkProxy.h"
00015 
00016 #include "TH1.h"
00017 #include "TString.h"
00018 
00019 #include "TGo4Slot.h"
00020 #include "TGo4ObjectManager.h"
00021 
00022 TGo4LinkProxy::TGo4LinkProxy() :
00023    TGo4Proxy(),
00024    fLink(0)
00025 {
00026 }
00027 
00028 TGo4LinkProxy::TGo4LinkProxy(TGo4Slot* linkedslot) :
00029    TGo4Proxy(),
00030    fLink(linkedslot)
00031 {
00032 }
00033 
00034 TGo4LinkProxy::~TGo4LinkProxy()
00035 {
00036 }
00037 
00038 void TGo4LinkProxy::Initialize(TGo4Slot* slot)
00039 {
00040    TGo4ObjectManager* om = slot->GetOM();
00041    if (om!=0)
00042      om->RegisterLink(fLink, slot);
00043 }
00044 
00045 void TGo4LinkProxy::Finalize(TGo4Slot* slot)
00046 {
00047    TGo4ObjectManager* om = slot->GetOM();
00048    if (om!=0) {
00049       // this is workaround a problem, that in TGo4Slot destructor CleanProxy
00050       // called before Event(this, evDelete)
00051       // For that situation we retranslate evDelete message before link will dissaper from OM
00052       if (slot->DoingDelete())
00053          om->RetranslateEvent(slot, TGo4Slot::evDelete);
00054 
00055       om->UnregisterLink(slot);
00056    }
00057 }
00058 
00059 TGo4Access* TGo4LinkProxy::MakeProxy(const char* name)
00060 {
00061    return (fLink!=0)  ? fLink->ProvideSlotAccess(name) : 0;
00062 }
00063 
00064 TGo4LevelIter* TGo4LinkProxy::MakeIter()
00065 {
00066    return (fLink!=0)  ? fLink->MakeLevelIter() : 0;
00067 }
00068 
00069 void TGo4LinkProxy::WriteData(TGo4Slot* slot, TDirectory* dir, Bool_t onlyobjs)
00070 {
00071    if (!onlyobjs) {
00072       TString linkname;
00073       if (fLink!=0)
00074         fLink->ProduceFullName(linkname);
00075 
00076       slot->SetPar("LinkProxy::LinkName", linkname.Length()>0 ? linkname.Data() : 0);
00077    }
00078 }
00079 
00080 void TGo4LinkProxy::ReadData(TGo4Slot* slot, TDirectory* dir)
00081 {
00082    const char* linkname = slot->GetPar("LinkProxy::LinkName");
00083    if (linkname!=0)
00084      fLink = slot->GetOM()->GetSlot(linkname);
00085 
00086 }
00087 
00088 Int_t TGo4LinkProxy::GetObjectKind()
00089 {
00090    return (fLink!=0) ? fLink->GetSlotKind() : TGo4Access::kndNone;
00091 }
00092 
00093 const char* TGo4LinkProxy::GetContainedClassName()
00094 {
00095    return (fLink!=0) ? fLink->GetSlotClassName() : 0;
00096 }
00097 
00098 Bool_t TGo4LinkProxy::IsAcceptObject(TClass* cl)
00099 {
00100    return (fLink!=0) ? fLink->IsAcceptObject(cl) : kFALSE;
00101 }
00102 
00103 Bool_t TGo4LinkProxy::AssignObject(TGo4Slot* slot, TObject* obj, Bool_t owner)
00104 {
00105    return fLink==0 ? kFALSE : fLink->AssignObject(obj, owner);
00106 }
00107 
00108 TObject* TGo4LinkProxy::GetAssignedObject()
00109 {
00110    return fLink==0 ? 0 : fLink->GetAssignedObject();
00111 }
00112 
00113 Bool_t TGo4LinkProxy::ProcessEvent(TGo4Slot* slot, TGo4Slot* source, Int_t id, void* param)
00114 {
00115     if ((id == TGo4Slot::evDelete) && (source == fLink)) {
00116        // next line very important.
00117        // If master slot says that it will be deleted, we just
00118        // brake dependency from it and "forgot" that it is existing
00119        // As a result, access to master object will be canceled
00120        // After we delete slot with our link proxy.
00121        // For instance, if marker is assigned to histogram, and histogram
00122        // is deleted (file closed), marker cannot access histogram pointer
00123        // and will be reassigned to null histogram even when master slot is
00124        // able to provide histogram pointer.
00125        fLink = 0;
00126        slot->Delete();
00127 //       delete slot;
00128        // we delete slot with timer afterwards
00129 
00130 //       TGo4ObjectManager* om = slot->GetOM();
00131        // om->UnregisterLink(slot);
00132 //       om->DeleteObject(slot);
00133 
00134 //       slot->ForwardEvent(slot, TGo4Slot::evObjDeleted);
00135 
00136        return kFALSE;
00137     }
00138 
00139     // emulate that message come from this slot, not from master link
00140     slot->ForwardEvent(slot, id, param);
00141 
00142     return kFALSE;
00143 }