Introduced application-wide close lock.
This commit is contained in:
Martin Rotter
parent
175e657af7
commit
80e8fcd0f6
9 changed files with 73 additions and 7 deletions
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@ -1,6 +1,11 @@
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<body>
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[2.0.0]
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<ul>
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<li>Initial second generation release.</li>
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<li>[@] Initial second generation release.</li>
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</ul>
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[+] added <br/>
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[#] fixed <br/>
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[~] changed <br/>
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[@] other action <br/>
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</body>
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@ -29,6 +29,7 @@
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#define NO_PARENT_CATEGORY -1
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#define TRAY_ICON_BUBBLE_TIMEOUT 15000
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#define KEY_MESSAGES_VIEW "messages_view_column_"
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#define CLOSE_LOCK_TIMEOUT 2000
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#define APP_DB_INIT_FILE "db_init.sql"
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#define APP_DB_INIT_SPLIT "-- !\n"
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@ -17,10 +17,13 @@
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QPointer<SystemFactory> SystemFactory::s_instance;
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SystemFactory::SystemFactory(QObject *parent) : QObject(parent) {
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m_applicationCloseLock = new QReadWriteLock(QReadWriteLock::NonRecursive);
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}
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SystemFactory::~SystemFactory() {
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qDebug("Destroying SystemFactory instance.");
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delete m_applicationCloseLock;
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}
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@ -99,6 +102,10 @@ SystemFactory *SystemFactory::getInstance() {
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return s_instance;
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}
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QReadWriteLock *SystemFactory::applicationCloseLock() const {
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return m_applicationCloseLock;
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}
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bool SystemFactory::setAutoStartStatus(const AutoStartStatus &new_status) {
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SystemFactory::AutoStartStatus current_status = SystemFactory::getAutoStartStatus();
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@ -6,14 +6,17 @@
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class QReadWriteLock;
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class QMutex;
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class SystemFactory : public QObject {
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Q_OBJECT
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private:
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// Constructors and destructors.
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explicit SystemFactory(QObject *parent = 0);
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public:
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// Constructors and destructors.
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virtual ~SystemFactory();
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// Specifies possible states of auto-start functionality.
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@ -40,7 +43,24 @@ class SystemFactory : public QObject {
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// Singleton getter.
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static SystemFactory *getInstance();
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// Access to application-wide close lock.
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QReadWriteLock *applicationCloseLock() const;
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private:
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// This read-write lock is used by application on its close.
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// Application locks this lock for WRITTING.
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// This means that if application locks that lock, then
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// no other transaction-critical action can acquire lock
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// for reading and won't be executed, so no critical action
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// will be running when application quits
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//
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// EACH critical action locks this lock for READING.
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// Several actions can lock this lock for reading.
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// But of user decides to close the application (in other words,
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// tries to lock the lock for writting), then no other
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// action will be allowed to lock for reading.
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QReadWriteLock *m_applicationCloseLock;
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static QPointer<SystemFactory> s_instance;
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};
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@ -18,6 +18,7 @@ class FeedsView : public QTreeView {
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void setSortingEnabled(bool enable);
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// Returns list of selected feeds.
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QList<FeedsModelFeed*> selectedFeeds() const;
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public slots:
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@ -25,7 +26,10 @@ class FeedsView : public QTreeView {
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void updateCountsOfSelectedFeeds();
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protected:
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// Sets up appearance of this widget.
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void setupAppearance();
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void selectionChanged(const QItemSelection &selected,
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const QItemSelection &deselected);
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@ -2,6 +2,7 @@
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#include "core/defs.h"
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#include "core/settings.h"
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#include "core/systemfactory.h"
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#include "gui/formabout.h"
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#include "gui/formsettings.h"
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#include "gui/webbrowser.h"
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@ -17,6 +18,7 @@
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#include <QSessionManager>
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#include <QRect>
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#include <QDesktopWidget>
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#include <QReadWriteLock>
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FormMain *FormMain::s_instance;
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@ -129,6 +131,20 @@ void FormMain::processExecutionMessage(const QString &message) {
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void FormMain::quit() {
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qDebug("Quitting the application.");
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// Make sure that we obtain close lock
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// BEFORE even trying to quit the application.
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if (SystemFactory::getInstance()->applicationCloseLock()->tryLockForWrite(CLOSE_LOCK_TIMEOUT)) {
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// Application obtained permission to close
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// in a safety way.
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qDebug("Close lock obtained safely.");
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}
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else {
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// Request for write lock timed-out. This means
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// that some critical action can be processed right now.
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qDebug("Close lock timed-out.");
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}
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qApp->quit();
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}
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@ -178,6 +194,7 @@ void FormMain::onSaveState(QSessionManager &manager) {
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void FormMain::onAboutToQuit() {
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qDebug("Cleaning up resources and saving application state.");
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saveSize();
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}
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@ -103,6 +103,11 @@ void MessagesView::setupAppearance() {
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setSortingEnabled(true);
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setAllColumnsShowFocus(true);
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setSelectionMode(QAbstractItemView::ExtendedSelection);
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// Make sure that initial sorting is that unread messages are visible
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// first.
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// NOTE: This can be rewritten so that it's changeable.
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sortByColumn(MSG_DB_READ_INDEX, Qt::AscendingOrder);
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}
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void MessagesView::keyPressEvent(QKeyEvent *event) {
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@ -198,7 +203,13 @@ void MessagesView::currentChanged(const QModelIndex ¤t,
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}
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void MessagesView::loadFeeds(const QList<int> &feed_ids) {
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// Load messages.
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// TODO: Here we could load user-defined default sorting
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// column/order AND possibly hide/show user-defined columns.
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m_sourceModel->loadMessages(feed_ids);
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// Messages are loaded, make sure that previously
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// active message is not shown in browser.
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emit currentMessageRemoved();
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}
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@ -23,6 +23,7 @@ class MessagesView : public QTreeView {
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MessagesModel *sourceModel();
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public slots:
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// Loads un-deleted messages from selected feeds.
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void loadFeeds(const QList<int> &feed_ids);
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// Message manipulators.
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