ProjectExplorer: Prepare RunWorkers for more flexible setups

A RunWorker can in theory (and will in practice) support several
run modes. Also, it has turned out to be beneficial to specify
restrictions on a fine grained level, so re-use the idea from
the RunConfigurationFactory etc. constraints setup here.

Creation of RunWorkerFactories can be made protected at some time.

Change-Id: I9e2a84abfd7377c5bf0bbe84e0c7940b1317dc10
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -685,8 +685,7 @@ FixedRunConfigurationFactory::availableCreators(Target *parent) const
 
 static QList<RunWorkerFactory *> g_runWorkerFactories;
 
-RunWorkerFactory::RunWorkerFactory(Core::Id mode, Constraint constr, const WorkerCreator &prod, int prio)
+RunWorkerFactory::RunWorkerFactory()
-    : m_runMode(mode), m_constraint(constr), m_producer(prod), m_priority(prio)
 {
     g_runWorkerFactories.append(this);
 }
@@ -698,11 +697,40 @@ RunWorkerFactory::~RunWorkerFactory()
 
 bool RunWorkerFactory::canRun(RunConfiguration *runConfiguration, Core::Id runMode) const
 {
-    if (runMode != this->m_runMode)
+    if (!m_supportedRunModes.contains(runMode))
         return false;
-    if (!m_constraint)
+
+    for (const Constraint &constraint : m_constraints) {
+        if (!constraint(runConfiguration))
+            return false;
+    }
+
     return true;
-    return m_constraint(runConfiguration);
+}
+
+void RunWorkerFactory::setPriority(int priority)
+{
+    m_priority = priority;
+}
+
+void RunWorkerFactory::setProducer(const WorkerCreator &producer)
+{
+    m_producer = producer;
+}
+
+void RunWorkerFactory::addConstraint(const Constraint &constraint)
+{
+    // Default constructed Constraints are not worth keeping.
+    // FIXME: Make it a QTC_ASSERT once there is no code path
+    // using this "feature" anymore.
+    if (!constraint)
+        return;
+    m_constraints.append(constraint);
+}
+
+void RunWorkerFactory::addSupportedRunMode(Core::Id runMode)
+{
+    m_supportedRunModes.append(runMode);
 }
 
 void RunWorkerFactory::destroyRemainingRunWorkerFactories()

src/plugins/projectexplorer/runconfiguration.h

@@ -453,12 +453,29 @@ public:
     using WorkerCreator = std::function<RunWorker *(RunControl *)>;
     using Constraint = std::function<bool(RunConfiguration *)>;
 
-    RunWorkerFactory(Core::Id mode, Constraint constr, const WorkerCreator &prod,
+    RunWorkerFactory();
-                     int prio = 0);
-
     virtual ~RunWorkerFactory();
 
-    bool canRun(RunConfiguration *runConfiguration, Core::Id m_runMode) const;
+    template <class Worker>
+    void registerRunWorker()
+    {
+        m_producer = [](RunControl *rc) { return new Worker(rc); };
+    }
+
+    template <class RunConfig>
+    void setSupportedRunConfiguration()
+    {
+        m_constraints.append([](RunConfiguration *runConfig) {
+            return qobject_cast<RunConfig *>(runConfig) != nullptr;
+        });
+    }
+
+    bool canRun(RunConfiguration *runConfiguration, Core::Id runMode) const;
+
+    void setPriority(int priority);
+    void setProducer(const WorkerCreator &producer);
+    void addConstraint(const Constraint &constraint);
+    void addSupportedRunMode(Core::Id runMode);
 
     int priority() const { return m_priority; }
     WorkerCreator producer() const { return m_producer; }
@@ -469,8 +486,8 @@ private:
     friend class ProjectExplorerPlugin;
     static void destroyRemainingRunWorkerFactories();
 
-    Core::Id m_runMode;
+    QList<Core::Id> m_supportedRunModes;
-    Constraint m_constraint;
+    QList<Constraint> m_constraints;
     WorkerCreator m_producer;
     int m_priority = 0;
 };
@@ -546,20 +563,28 @@ public:
     static void registerWorker(Core::Id runMode, const WorkerCreator &producer,
                                const Constraint &constraint = {})
     {
-        (void) new RunWorkerFactory(runMode, constraint, producer);
+        auto factory = new RunWorkerFactory;
+        factory->setProducer(producer);
+        factory->addSupportedRunMode(runMode);
+        factory->addConstraint(constraint);
     }
     template <class Worker>
     static void registerWorker(Core::Id runMode, const Constraint &constraint, int priority = 0)
     {
-        auto producer = [](RunControl *rc) { return new Worker(rc); };
+        auto factory = new RunWorkerFactory;
-        (void) new RunWorkerFactory(runMode, constraint, producer, priority);
+        factory->registerRunWorker<Worker>();
+        factory->addSupportedRunMode(runMode);
+        factory->addConstraint(constraint);
+        factory->setPriority(priority);
     }
     template <class Config, class Worker>
     static void registerWorker(Core::Id runMode, int priority = 0)
     {
-        auto constraint = [](RunConfiguration *runConfig) { return qobject_cast<Config *>(runConfig) != nullptr; };
+        auto factory = new RunWorkerFactory;
-        auto producer = [](RunControl *rc) { return new Worker(rc); };
+        factory->registerRunWorker<Worker>();
-        (void) new RunWorkerFactory(runMode, constraint, producer, priority);
+        factory->addSupportedRunMode(runMode);
+        factory->setSupportedRunConfiguration<Config>();
+        factory->setPriority(priority);
     }
 
     static WorkerCreator producer(RunConfiguration *runConfiguration, Core::Id runMode);