refs #324 airspace watchdog

CAirspaceWatchdog times out clients, if a no update has been received
for a configured time

src/blackcore/airspace_watchdog.cpp

@@ -0,0 +1,72 @@
+/* Copyright (C) 2014
+ * 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 "airspace_watchdog.h"
+#include "blackmisc/logmessage.h"
+
+namespace BlackCore
+{
+
+    using namespace BlackMisc;
+    using namespace BlackMisc::Aviation;
+    using namespace BlackMisc::PhysicalQuantities;
+
+    CAirspaceWatchdog::CAirspaceWatchdog(QObject *parent)
+        : QObject(parent)
+    {
+        startTimer(5000);
+    }
+
+    CAirspaceWatchdog::CAirspaceWatchdog(const CTime &initialTimeOut, QObject *parent)
+        : QObject(parent), m_timeout(initialTimeOut)
+    {
+    }
+
+    void CAirspaceWatchdog::addCallsign(const CCallsign &callsign)
+    {
+        if (m_callsignTimestamps.contains(callsign)) return;
+        m_callsignTimestamps.insert(callsign, QDateTime::currentDateTimeUtc());
+    }
+
+    void CAirspaceWatchdog::resetCallsign(const CCallsign &callsign)
+    {
+        Q_ASSERT(m_callsignTimestamps.contains(callsign));
+        m_callsignTimestamps[callsign] = QDateTime::currentDateTimeUtc();
+    }
+
+    void CAirspaceWatchdog::removeCallsign(const CCallsign &callsign)
+    {
+        m_callsignTimestamps.remove(callsign);
+    }
+
+    void CAirspaceWatchdog::removeAll()
+    {
+        m_callsignTimestamps.clear();
+    }
+
+    void CAirspaceWatchdog::timerEvent(QTimerEvent *event)
+    {
+        Q_UNUSED(event)
+        checkTimeouts();
+    }
+
+    void CAirspaceWatchdog::checkTimeouts()
+    {
+        for (CCallsign callsign : m_callsignTimestamps.keys())
+        {
+            QDateTime timestamp = m_callsignTimestamps.value(callsign);
+            if (timestamp.secsTo(QDateTime::currentDateTimeUtc()) > m_timeout.value(CTimeUnit::s()))
+            {
+                CLogMessage().debug(this) << "Aircraft " << callsign.toQString() << "timed out!";
+                m_callsignTimestamps.remove(callsign);
+                emit timeout(callsign);
+            }
+        }
+    }
+}