C++ CBOINCBaseFrame::GetEventHandler方法代码示例

//.........这里部分代码省略.........
            break;
        case RPC_GET_STATISTICS:
            if (current_rpc_request.exchangeBuf && !retval) {
                PROJECTS* arg1 = (PROJECTS*)current_rpc_request.arg1;
                PROJECTS* exchangeBuf = (PROJECTS*)current_rpc_request.exchangeBuf;
                arg1->projects.swap(exchangeBuf->projects);
            }
            break;
            
        case RPC_GET_CC_STATUS:
            if (current_rpc_request.exchangeBuf && !retval) {
                CC_STATUS* arg1 = (CC_STATUS*)current_rpc_request.arg1;
                CC_STATUS* exchangeBuf = (CC_STATUS*)current_rpc_request.exchangeBuf;
                *exchangeBuf = *arg1;
            }
            break;
        case RPC_ACCT_MGR_INFO:
            if (current_rpc_request.exchangeBuf && !retval) {
                ACCT_MGR_INFO* arg1 = (ACCT_MGR_INFO*)current_rpc_request.arg1;
                ACCT_MGR_INFO* exchangeBuf = (ACCT_MGR_INFO*)current_rpc_request.exchangeBuf;
                *exchangeBuf = *arg1;
           }
            break;
        default:
            // We don't support double buffering for other RPC calls 
            wxASSERT(current_rpc_request.exchangeBuf == NULL);
            break;
        }
    }
    
    if (current_rpc_request.resultPtr) {
        // In case post-processing changed retval
        *(current_rpc_request.resultPtr) = retval;
    }

    // We must call ProcessEvent() rather than AddPendingEvent() here to 
    // guarantee integrity of data when other events are handled (such as 
    // Abort, Suspend/Resume, Show Graphics, Update, Detach, Reset, No 
    // New Work, etc.)  Otherwise, if one of those events is pending it 
    // might be processed first, and the data in the selected rows may not 
    // match the data which the user selected if any rows were added or 
    // deleted due to the RPC.  
    // The refresh event called here adjusts the selections to fix any 
    // such mismatch before other pending events are processed.  
    //
    // However, the refresh code may itself request a Demand RPC, which 
    // would cause undesirable recursion if we are already waiting for 
    // another Demand RPC to complete.  In that case, we defer the refresh 
    // until all pending Demand RPCs have been done.
    //
    if (m_bNeedRefresh && !m_bWaitingForRPC) {
        m_bNeedRefresh = false;
        // We must get the frame immediately before using it, 
        // since it may have been changed by SetActiveGUI().
        CBOINCBaseFrame* pFrame = wxGetApp().GetFrame();
        if (pFrame) {
            CFrameEvent event(wxEVT_FRAME_REFRESHVIEW, pFrame);
            pFrame->GetEventHandler()->ProcessEvent(event);
        }
    }

    if (m_bNeedTaskBarRefresh && !m_bWaitingForRPC) {
        m_bNeedTaskBarRefresh = false;
        CTaskBarIcon* pTaskbar = wxGetApp().GetTaskBarIcon();
        if (pTaskbar) {
            CTaskbarEvent event(wxEVT_TASKBAR_REFRESH, pTaskbar);
            pTaskbar->ProcessEvent(event);
        }
    }

    if (current_rpc_request.rpcType == RPC_TYPE_ASYNC_WITH_REFRESH_EVENT_LOG_AFTER) {
        CDlgEventLog* eventLog = wxGetApp().GetEventLog();
        if (eventLog) {
            eventLog->OnRefresh();
        }
    }
    
    current_rpc_request.clear();

    // Start the next RPC request.  
    // We can't start this until finished processing the previous RPC's 
    // event because the two requests may write into the same buffer.
    if (RPC_requests.size() > 0) {
        // Wait for thread to unlock mutex with m_pRPC_Thread_Condition->Wait()
        mutexErr = m_pRPC_Thread_Mutex->Lock();  // Blocks until thread unlocks the mutex
        wxASSERT(mutexErr == wxMUTEX_NO_ERROR);

        // Make sure activation is an atomic operation
        RPC_requests[0].isActive = false;
        current_rpc_request = RPC_requests[0];
        current_rpc_request.isActive = true;

        m_pRPC_Thread_Condition->Signal();  // Unblock the thread

        // m_pRPC_Thread_Condition->Wait() will Lock() the mutex upon receiving Signal(), 
        // causing it to block again if we still have our lock on the mutex.
        mutexErr = m_pRPC_Thread_Mutex->Unlock();
        wxASSERT(mutexErr == wxMUTEX_NO_ERROR);
    }
}

//.........这里部分代码省略.........
                // process events so user can maximize the manager. 
                //
                // NOTE: CBOINCGUIApp::FilterEvent() discards those events 
                // which might cause posting of more RPC requests while 
                // we are in this loop, to prevent undesirable recursion.
                // Since the manager is minimized, we don't have to worry about 
                // discarding crucial drawing or command events. 
                // The filter does allow the the Open Manager menu item from 
                // the system tray icon and wxEVT_RPC_FINISHED event. 
                //
                timeToSleep = DELAY_WHEN_MINIMIZED; // Allow user to maximize Manager
                wxSafeYield(NULL, true);
            }
            
            // OnRPCComplete() clears m_bWaitingForRPC if RPC completed 
            if (! m_bWaitingForRPC) {
                return retval;
            }
            
            mutexErr = m_pRPC_Request_Mutex->Lock();
            wxASSERT(mutexErr == wxMUTEX_NO_ERROR);

            // Simulate handling of CRPCFinishedEvent but don't allow any other 
            // events (so no user activity) to prevent undesirable recursion.
            // Since we don't need to filter and discard events, they remain on 
            // the queue until it is safe to process them.
            // Allow RPC thread to run while we wait for it.
            if (!current_rpc_request.isActive) {
                mutexErr = m_pRPC_Request_Mutex->Unlock();
                wxASSERT(mutexErr == wxMUTEX_NO_ERROR);
                
                HandleCompletedRPC();
                continue;
            }

            // Wait for RPC thread to wake us
            // This does the following:
            // (1) Unlocks the Mutex and puts the main thread to sleep as an atomic operation.
            // (2) On Signal from RPC thread: locks Mutex again and wakes the main thread.
            m_pRPC_Request_Condition->WaitTimeout(timeToSleep);

            mutexErr = m_pRPC_Request_Mutex->Unlock();
            wxASSERT(mutexErr == wxMUTEX_NO_ERROR);
        }
        
        // Demand RPC has taken longer than RPC_WAIT_DLG_DELAY seconds and 
        // Manager is not minimized, so display the "Please Wait" dialog 
        // with a Cancel button.  If the RPC does complete while the dialog 
        // is up, HandleCompletedRPC() will call EndModal with wxID_OK.
        //
        // NOTE: the Modal dialog permits processing of all events, but 
        // CBOINCGUIApp::FilterEvent() blocks those events which might cause 
        // posting of more RPC requests while in this dialog, to prevent 
        // undesirable recursion.
        //
        if (m_RPCWaitDlg) {
            response = m_RPCWaitDlg->ShowModal();
            // Remember time the dialog was closed for use by RunPeriodicRPCs()
            m_dtLasAsyncRPCDlgTime = wxDateTime::Now();
            if (response != wxID_OK) {
                // TODO: If user presses Cancel in Please Wait dialog but request 
                // has not yet been started, should we just remove it from queue? 
                // If we make that change, should we also add a separate menu item  
                // to reset the RPC connection (or does one already exist)?

                retval = -1;
                // If the RPC continues to get data after we return to 
                // our caller, it may try to write into a buffer or struct
                // which the caller has already deleted.  To prevent this, 
                // we close the socket (disconnect) and kill the RPC thread.
                // This is ugly but necessary.  We must then reconnect and 
                // start a new RPC thread.
                if (current_rpc_request.isActive) {
                    current_rpc_request.isActive = false;
                    rpcClient.close();
                    RPC_requests.clear();
                    current_rpc_request.clear();
                    m_bNeedRefresh = false;
                    m_bNeedTaskBarRefresh = false;

                    // We will be reconnected to the same client (if possible) by 
                    // CBOINCDialUpManager::OnPoll() and CNetworkConnection::Poll().
                    m_pNetworkConnection->SetStateDisconnected();
                }
                if (response == wxID_EXIT) {
                    pFrame = wxGetApp().GetFrame();
                    wxCommandEvent evt(wxEVT_COMMAND_MENU_SELECTED, wxID_EXIT);
                    s_bSkipExitConfirmation = true;
                    pFrame->GetEventHandler()->AddPendingEvent(evt);
                }
            }
            if (m_RPCWaitDlg) {
                m_RPCWaitDlg->Destroy();
            }
            m_RPCWaitDlg = NULL;
            m_bWaitingForRPC = false;
        }
    }
    return retval;
}