Method loadPlugin

src/framework/lifecycle/private/pluginmanager_p.cpp:110–149

! * \brief 加载一个插件，线程安全，可单独使用 * \param pluginMetaObj */

 * \param pluginMetaObj
 */
bool PluginManagerPrivate::loadPlugin(PluginMetaObjectPointer &pluginMetaObj)
{
    dpfCheckTimeBegin();
    // don't load disabled plugins
    if (!pluginMetaObj->isEnabledBySettings())
        return true;

    QMutexLocker lock(&GlobalPrivate::mutex);

    //流程互斥
    if (pluginMetaObj->d->state >= PluginMetaObject::State::Loaded) {
        dpfDebug() << "Plugin"
                   << pluginMetaObj->d->name
                   << "already loaded and state: "
                   << pluginMetaObj->d->state;
        return true;
    }

    if (pluginMetaObj.isNull()) {
        dpfCritical() << "Failed, load plugin is nullptr";
        return false;
    }

    bool result = pluginMetaObj->d->loader->load();
    pluginMetaObj->d->plugin = QSharedPointer<Plugin>(
                qobject_cast<Plugin*>(pluginMetaObj->d->loader->instance()));
    if (!pluginMetaObj->d->plugin.isNull()) {
        pluginMetaObj->d->state = PluginMetaObject::State::Loaded;
        dpfDebug() << "Loaded plugin: " << pluginMetaObj->d->name;
    } else {
        pluginMetaObj->d->error = "Failed, get plugin instance is nullptr: "
                + pluginMetaObj->d->loader->errorString();
        dpfCritical() << pluginMetaObj->d->error;
        result = false;
    }

    dpfCheckTimeEnd();

    return result;
}

/*!
 * \brief 初始化一个插件，线程安全，可单独使用