Headless server: simplify system config logger

QsLog/QsLogDestFunctor.h

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+// Copyright (c) 2014, Razvan Petru
+// Copyright (c) 2014, Omar Carey
+// All rights reserved.
+
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+
+// * Redistributions of source code must retain the above copyright notice, this
+//   list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice, this
+//   list of conditions and the following disclaimer in the documentation and/or other
+//   materials provided with the distribution.
+// * The name of the contributors may not be used to endorse or promote products
+//   derived from this software without specific prior written permission.
+
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+// OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef QSLOGDESTFUNCTOR_H
+#define QSLOGDESTFUNCTOR_H
+
+#include "QsLogDest.h"
+#include <QObject>
+
+namespace QsLogging
+{
+// Offers various types of function-like sinks.
+// This is an advanced destination type. Depending on your configuration, LogFunction might be
+// called from a different thread or even a different binary. You should not access QsLog from
+// inside LogFunction and should not perform any time-consuming operations.
+// logMessageReady is connected through a queued connection and trace messages are not included
+class FunctorDestination : public QObject, public Destination
+{
+    Q_OBJECT
+public:
+    explicit FunctorDestination(LogFunction f);
+    FunctorDestination(QObject *receiver, const char *member);
+
+    virtual void write(const QString &message, Level level);
+    virtual bool isValid();
+
+protected:
+    // int used to avoid registering a new enum type
+    Q_SIGNAL void logMessageReady(const QString &message, int level);
+
+private:
+    LogFunction mLogFunction;
+};
+}
+
+#endif // QSLOGDESTFUNCTOR_H