1 | /* $Id: UIExecutionQueue.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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2 | /** @file
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3 | * VBox Qt GUI - UIExecutionQueue class implementation.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2021-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 | /* GUI includes: */
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29 | #include "UIExecutionQueue.h"
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30 |
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31 |
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32 | /*********************************************************************************************************************************
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33 | * Class UIExecutionStep implementation. *
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34 | *********************************************************************************************************************************/
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35 |
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36 | UIExecutionStep::UIExecutionStep()
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37 | {
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38 | }
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39 |
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40 |
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41 | /*********************************************************************************************************************************
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42 | * Class UIExecutionQueue implementation. *
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43 | *********************************************************************************************************************************/
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44 |
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45 | UIExecutionQueue::UIExecutionQueue(QObject *pParent /* = 0 */)
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46 | : QObject(pParent)
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47 | , m_pExecutedStep(0)
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48 | {
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49 | /* Listen for the queue start signal: */
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50 | connect(this, &UIExecutionQueue::sigStartQueue,
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51 | this, &UIExecutionQueue::sltStartsSubsequentStep,
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52 | Qt::QueuedConnection);
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53 | }
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54 |
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55 | UIExecutionQueue::~UIExecutionQueue()
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56 | {
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57 | /* Cleanup current step: */
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58 | delete m_pExecutedStep;
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59 | m_pExecutedStep = 0;
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60 |
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61 | /* Dequeue steps one-by-one: */
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62 | while (!m_queue.isEmpty())
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63 | delete m_queue.dequeue();
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64 | }
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65 |
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66 | void UIExecutionQueue::enqueue(UIExecutionStep *pUpdateStep)
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67 | {
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68 | m_queue.enqueue(pUpdateStep);
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69 | }
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70 |
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71 | void UIExecutionQueue::sltStartsSubsequentStep()
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72 | {
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73 | /* Cleanup current step: */
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74 | delete m_pExecutedStep;
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75 | m_pExecutedStep = 0;
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76 |
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77 | /* If queue is empty, we are finished: */
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78 | if (m_queue.isEmpty())
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79 | emit sigQueueFinished();
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80 | else
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81 | {
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82 | /* Otherwise dequeue first step and start it: */
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83 | m_pExecutedStep = m_queue.dequeue();
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84 | connect(m_pExecutedStep, &UIExecutionStep::sigStepFinished,
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85 | this, &UIExecutionQueue::sltStartsSubsequentStep,
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86 | Qt::QueuedConnection);
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87 | m_pExecutedStep->exec();
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88 | }
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89 | }
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