Issue #15 Added IDataLink, an interface for registering observers and mutators,

and CDataLinkLocal, an implementation for sharing state within a single process

src/blackmisc/sharedstate/datalinklocal.h

@@ -0,0 +1,64 @@
+/* Copyright (C) 2017
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_SHAREDSTATE_DATALINKLOCAL_H
+#define BLACKMISC_SHAREDSTATE_DATALINKLOCAL_H
+
+#include "blackmisc/sharedstate/datalink.h"
+#include "blackmisc/variant.h"
+#include "blackmisc/blackmiscexport.h"
+#include <QObject>
+#include <QFuture>
+#include <QMutex>
+
+namespace BlackMisc
+{
+    namespace SharedState
+    {
+        /*!
+         * A transport mechanism using signals and slots in the local process.
+         * \ingroup SharedState
+         */
+        class BLACKMISC_EXPORT CDataLinkLocal : public QObject, public IDataLink
+        {
+            Q_OBJECT
+            Q_INTERFACES(BlackMisc::SharedState::IDataLink)
+
+        public:
+            //! Constructor.
+            CDataLinkLocal(QObject *parent = nullptr);
+
+            //! Destructor.
+            virtual ~CDataLinkLocal() override;
+
+            virtual void publish(const CPassiveMutator *mutator) override;
+            virtual void publish(const CActiveMutator *mutator) override;
+            virtual void subscribe(const CPassiveObserver *observer) override;
+            virtual void subscribe(const CActiveObserver *observer) override;
+
+        private:
+            struct Channel
+            {
+                QWeakPointer<const CActiveMutator> activeMutator;
+                QVector<QWeakPointer<const CPassiveObserver>> passiveObservers;
+            };
+
+            void dispatchEvent(const CVariant &param, const QString &channel);
+            QFuture<CVariant> handleRequest(const CVariant &param, const QString &channel);
+            Channel &getChannel(const QString &name);
+            Channel &getChannel(const QObject *object);
+
+            QMap<QString, Channel> m_channels;
+            mutable QMutex m_channelsMutex { QMutex::Recursive };
+        };
+    }
+}
+
+#endif