shared: Add LimitQueue which discards oldest entry once limit hit

shared/limitqueue.h

@@ -0,0 +1,48 @@
+#ifndef LIMITQUEUE_H
+#define LIMITQUEUE_H
+#include <QQueue>
+
+template <class T> class LimitQueue
+{
+  protected:
+	QQueue<T> queue;
+	unsigned int limit = 0;
+
+  public:
+	LimitQueue();
+	LimitQueue(unsigned int limit)
+	{
+		this->limit = limit;
+	}
+
+	void enqueue(const T &t)
+	{
+		if(queue.size() == limit)
+		{
+			queue.dequeue();
+		}
+		queue.enqueue(t);
+	}
+
+	int size()
+	{
+		return queue.size();
+	}
+
+	T dequeue()
+	{
+		return queue.dequeue();
+	}
+
+	void setLimit(unsigned int limit)
+	{
+		this->limit = limit;
+	}
+
+	void clear()
+	{
+		queue.clear();
+	}
+};
+
+#endif // LIMITQUEUE_H

shared/shared.pro

@@ -77,6 +77,7 @@ HEADERS += sqlitesearch.h \
     filescanworker.h \
     indexer.h \
     indexsyncer.h \
+    limitqueue.h \
     logger.h \
     looqsgeneralexception.h \
     looqsquery.h \