Handled performance issues and bugs noticed during testing of refs #319 / refs #322

* discussion: https://dev.vatsim-germany.org/boards/22/topics/2027?r=2040#message-2040
* fixed bug with ATC station component, wrong signals for booked stations
* booked stations loading to frequently (for each minor change such as online), changed to timestamp based concept
* update booked stations with receiving ATIS/voiceroom to online
* CDigestSignal class: new class and methods for collecting signals, avoiding too many signals - one of the cures for the performance issues
* fixed bug found during testing, missing start for timers when connecting to network

src/blackmisc/digestsignal.cpp

@@ -0,0 +1,36 @@
+/* Copyright (C) 2013
+ * 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 and at http://www.swift-project.org/license.html. 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.
+ */
+
+#include "digestsignal.h"
+
+namespace BlackMisc
+{
+
+    void CDigestSignal::ps_inputSignal()
+    {
+        if (m_timer.isActive())
+        {
+            m_timer.start();
+        }
+
+        m_inputsCount++;
+        if (m_inputsCount >= m_maxInputsPerDigest)
+        {
+            ps_timeout();
+        }
+    }
+
+    void CDigestSignal::ps_timeout()
+    {
+        m_timer.stop();
+        m_inputsCount = 0;
+        emit digestSignal();
+    }
+
+} // namespace

src/blackmisc/digestsignal.h

@@ -0,0 +1,58 @@
+/* Copyright (C) 2013
+ * 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 and at http://www.swift-project.org/license.html. 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_DIGESTSIGNAL_H
+#define BLACKMISC_DIGESTSIGNAL_H
+
+#include <QTimer>
+#include <QObject>
+
+namespace BlackMisc
+{
+
+    //! Receive 1..n signal, collect them over time, and resend afer n milliseconds
+    class CDigestSignal : public QObject
+    {
+        Q_OBJECT
+
+    public:
+        //! Constructor
+        template <class T, class F1, class F2>
+        CDigestSignal(T *sender, F1 inputSignal, F2 digestSignal, int maxDelayMs = 500, int maxInputsPerDigest = 3)
+            : m_maxInputsPerDigest(maxInputsPerDigest)
+        {
+            QObject::connect(sender, inputSignal, this, &CDigestSignal::ps_inputSignal);
+            QObject::connect(this, &CDigestSignal::digestSignal, sender, digestSignal);
+
+            QObject::connect(&m_timer, &QTimer::timeout, this, &CDigestSignal::ps_timeout);
+            m_timer.setSingleShot(true);
+            m_timer.setInterval(maxDelayMs);
+        }
+
+    signals:
+        //! Send digest signal
+        void digestSignal();
+
+    private slots:
+        //! Received input signal
+        void ps_inputSignal();
+
+        //! Timer timed out
+        void ps_timeout();
+
+    private:
+        QTimer m_timer;
+        const int m_maxInputsPerDigest = 3;
+        int m_inputsCount = 0;
+    };
+}
+
+#endif