/* * Copyright 2006-2007 Aaron Seigo * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef PLASMA_ABSTRACTRUNNER_H #define PLASMA_ABSTRACTRUNNER_H #include #include #include #include #include #include #include #include #include #include class QAction; class QMimeData; class KCompletion; namespace Plasma { class DataEngine; class Package; class RunnerScript; class QueryMatch; class AbstractRunnerPrivate; /** * @class AbstractRunner plasma/abstractrunner.h * * @short An abstract base class for Plasma Runner plugins. * * Be aware that runners have to be thread-safe. This is due to the fact that * each runner is executed in its own thread for each new term. Thus, a runner * may be executed more than once at the same time. See match() for details. * To let krunner expose a global shortcut for the single runner query mode, the runner * must set the "X-Plasma-AdvertiseSingleRunnerMode" key to true in the .desktop file * and set a default syntax. See setDefaultSyntax() for details. * */ class PLASMA_EXPORT AbstractRunner : public QObject { Q_OBJECT Q_PROPERTY(bool matchingSuspended READ isMatchingSuspended WRITE suspendMatching NOTIFY matchingSuspended) public: /** Specifies a nominal speed for the runner */ enum Speed { SlowSpeed, NormalSpeed }; /** Specifies a priority for the runner */ enum Priority { LowestPriority = 0, LowPriority, NormalPriority, HighPriority, HighestPriority }; /** An ordered list of runners */ typedef QList List; virtual ~AbstractRunner(); /** * This is the main query method. It should trigger creation of * QueryMatch instances through RunnerContext::addMatch and * RunnerContext::addMatches. It is called internally by performMatch(). * * If the runner can run precisely the requested term (RunnerContext::query()), * it should create an exact match by setting the type to RunnerContext::ExactMatch. * The first runner that creates a QueryMatch will be the * default runner. Other runner's matches will be suggested in the * interface. Non-exact matches should be offered via RunnerContext::PossibleMatch. * * The match will be activated via run() if the user selects it. * * Each runner is executed in its own thread. Whenever the user input changes this * method is called again. Thus, it needs to be thread-safe. Also, all matches need * to be reported once this method returns. Asynchronous runners therefore need * to make use of a local event loop to wait for all matches. * * It is recommended to use local status data in async runners. The simplest way is * to have a separate class doing all the work like so: * * \code * void MyFancyAsyncRunner::match( RunnerContext& context ) * { * QEventLoop loop; * MyAsyncWorker worker( context ); * connect( &worker, SIGNAL(finished()), * &loop, SLOT(quit()) ); * worker.work(); * loop.exec(); * } * \endcode * * Here MyAsyncWorker creates all the matches and calls RunnerContext::addMatch * in some internal slot. It emits the finished() signal once done which will * quit the loop and make the match() method return. The local status is kept * entirely in MyAsyncWorker which makes match() trivially thread-safe. * * If a particular match supports multiple actions, set up the corresponding * actions in the actionsForMatch method. Do not call any of the action methods * within this method! * * Execution of the correct action should be handled in the run method. * @caution This method needs to be thread-safe since KRunner will simply * start a new thread for each new term. * * @warning Returning from this method means to end execution of the runner. * * @sa run(), RunnerContext::addMatch, RunnerContext::addMatches, QueryMatch */ virtual void match(Plasma::RunnerContext &context); /** * Triggers a call to match. This will call match() internally. * * @param context the search context used in executing this match. */ void performMatch(Plasma::RunnerContext &context); /** * If the runner has options that the user can interact with to modify * what happens when run or one of the actions created in match * is called, the runner should return true */ bool hasRunOptions(); /** * If hasRunOptions() returns true, this method may be called to get * a widget displaying the options the user can interact with to modify * the behaviour of what happens when a given match is selected. * * @param widget the parent of the options widgets. */ virtual void createRunOptions(QWidget *widget); /** * Called whenever an exact or possible match associated with this * runner is triggered. * * @param context The context in which the match is triggered, i.e. for which * the match was created. * @param match The actual match to run/execute. */ virtual void run(const Plasma::RunnerContext &context, const Plasma::QueryMatch &match); /** * The nominal speed of the runner. * @see setSpeed */ Speed speed() const; /** * The priority of the runner. * @see setPriority */ Priority priority() const; /** * Returns the OR'ed value of all the Information types (as defined in RunnerContext::Type) * this runner is not interested in. * @return OR'ed value of black listed types */ RunnerContext::Types ignoredTypes() const; /** * Sets the types this runner will ignore * @param types OR'ed listed of ignored types */ void setIgnoredTypes(RunnerContext::Types types); /** * @return the user visible engine name for the Runner */ QString name() const; /** * @return an id string for the Runner */ QString id() const; /** * @return the description of this Runner */ QString description() const; /** * @return the icon for this Runner */ QIcon icon() const; /** * Accessor for the associated Package object if any. * * Note that the returned pointer is only valid for the lifetime of * the runner. * * @return the Package object, which may be invalid **/ Package package() const; /** * Signal runner to reload its configuration. */ virtual void reloadConfiguration(); /** * @return the syntaxes the runner has registered that it accepts and understands * @since 4.3 */ QList syntaxes() const; /** * Access to a shared lock that all runners (and code that manages/interacts with them) * can share to protect access to non-thread-safe shared code or data. * Access of KSycoca records, for instance, is one place this lock should be used. * * Common usage: * * { * QMutexLocker lock(bigLock()); * .. do something that isn't thread safe .. * } */ static QMutex *bigLock(); /** * @return the default syntax for the runner or 0 if no default syntax has been defined * * @since 4.4 */ RunnerSyntax *defaultSyntax() const; /** * @return true if the runner is currently busy with non-interuptable work, signaling that * new threads should not be created for it at this time * @since 4.6 */ bool isMatchingSuspended() const; Q_SIGNALS: /** * This signal is emitted when matching is about to commence, giving runners * an opportunity to prepare themselves, e.g. loading data sets or preparing * IPC or network connections. This method should be fast so as not to cause * slow downs. Things that take longer or which should be loaded once and * remain extant for the lifespan of the AbstractRunner should be done in init(). * @see init() * @since 4.4 */ void prepare(); /** * This signal is emitted when a session of matches is complete, giving runners * the opportunity to tear down anything set up as a result of the prepare() * method. * @since 4.4 */ void teardown(); /** * Emitted when the runner enters or exits match suspension * @see matchingSuspended * @since 4.6 */ void matchingSuspended(bool suspended); protected: friend class RunnerManager; friend class RunnerManagerPrivate; explicit AbstractRunner(QObject *parent = 0, const QString &path = QString()); explicit AbstractRunner(const KService::Ptr service, QObject *parent = 0); AbstractRunner(QObject *parent, const QVariantList &args); /** * Sets whether or not the runner is available for match requests. Useful to * prevent more thread spawning when the thread is in a busy state. */ void suspendMatching(bool suspend); /** * Provides access to the runner's configuration object. */ KConfigGroup config() const; /** * Sets whether or not the runner has options for matches */ void setHasRunOptions(bool hasRunOptions); /** * Sets the nominal speed of the runner. Only slow runners need * to call this within their constructor because the default * speed is NormalSpeed. Runners that use DBUS should call * this within their constructors. */ void setSpeed(Speed newSpeed); /** * Sets the priority of the runner. Lower priority runners are executed * only after higher priority runners. */ void setPriority(Priority newPriority); /** * A given match can have more than action that can be performed on it. * For example, a song match returned by a music player runner can be queued, * added to the playlist, or played. * * Call this method to add actions that can be performed by the runner. * Actions must first be added to the runner's action registry. * Note: execution of correct action is left up to the runner. */ virtual QList actionsForMatch(const Plasma::QueryMatch &match); /** * Creates and then adds an action to the action registry. * AbstractRunner assumes ownership of the created action. * * @param id A unique identifier string * @param icon The icon to display * @param text The text to display * @return the created QAction */ QAction* addAction(const QString &id, const QIcon &icon, const QString &text); /** * Adds an action to the runner's action registry. * * The QAction must be created within the GUI thread; * do not create it within the match method of AbstractRunner. * * @param id A unique identifier string * @param action The QAction to be stored */ void addAction(const QString &id, QAction *action); /** * Removes the action from the action registry. * AbstractRunner deletes the action once removed. * * @param id The id of the action to be removed */ void removeAction(const QString &id); /** * Returns the action associated with the id */ QAction* action(const QString &id) const; /** * Returns all registered actions */ QHash actions() const; /** * Clears the action registry. * The action pool deletes the actions. */ void clearActions(); /** * Adds a registered syntax that this runner understands. This is used to * display to the user what this runner can understand and how it can be * used. * * @param syntax the syntax to register * @since 4.3 */ void addSyntax(const RunnerSyntax &syntax); /** * Set @p syntax as the default syntax for the runner; the default syntax will be * substituted to the empty query in single runner mode. This is also used to * display to the user what this runner can understand and how it can be * used. * The default syntax is automatically added to the list of registered syntaxes, there * is no need to add it using addSyntax. * Note that there can be only one default syntax; if called more than once, the last * call will determine the default syntax. * A default syntax (even trivial) is required to advertise single runner mode * * @param syntax the syntax to register and to set as default * @since 4.4 **/ void setDefaultSyntax(const RunnerSyntax &syntax); /** * Sets the list of syntaxes; passing in an empty list effectively clears * the syntaxes. * * @param the syntaxes to register for this runner * @since 4.3 */ void setSyntaxes(const QList &syns); /** * Loads the given DataEngine * * Tries to load the data engine given by @p name. Each engine is * only loaded once, and that instance is re-used on all subsequent * requests. * * If the data engine was not found, an invalid data engine is returned * (see DataEngine::isValid()). * * Note that you should not delete the returned engine. * * @param name Name of the data engine to load * @return pointer to the data engine if it was loaded, * or an invalid data engine if the requested engine * could not be loaded * * @since 4.4 */ Q_INVOKABLE DataEngine *dataEngine(const QString &name) const; /** * Reimplement this slot to run any initialization routines on first load. * By default, it calls reloadConfiguration(); for scripted Runners this * method also sets up the ScriptEngine. */ virtual void init(); /** * Reimplement this slot if you want your runner * to support serialization and drag and drop * @since 4.5 */ virtual QMimeData *mimeDataForMatch(const Plasma::QueryMatch &match); private: friend class RunnerScript; AbstractRunnerPrivate *const d; }; } // Plasma namespace #define K_EXPORT_PLASMA_RUNNER( libname, classname ) \ K_PLUGIN_FACTORY(factory, registerPlugin();) \ K_EXPORT_PLUGIN(factory("plasma_runner_" #libname)) \ K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION) /** * These plugins are Used by the plugin selector dialog to show * configuration options specific to this runner. These options * must be runner global and not pertain to a specific match. */ #define K_EXPORT_RUNNER_CONFIG( name, classname ) \ K_PLUGIN_FACTORY(ConfigFactory, registerPlugin();) \ K_EXPORT_PLUGIN(ConfigFactory("kcm_krunner_" #name)) \ K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION) #endif