Hi I managed to implement storing of "message" statistics...
I made a QMap <id, count> where I store tha stats for particular id
The only problem is that although they get updated upon new arriving messages they dont change actually displayed value...
I will explain:
I get 10 messages in a row of id=4.
But in view there is only displayed count=1 despite the fact that count contains 10.
The correct value is displayed when a message with the different id arrives...
Does anyone know what is wrong with that ?

My model:
Qt Code: 
  1. class MsgStatsModel : public QAbstractTableModel
  2. {
  3. 	Q_OBJECT
  4.  
  5. 	typedef QMap<int, int> IdStatsMap;
  6.  
  7.  
  8. 	public:
  9. 		int rowCount(const QModelIndex &parent = QModelIndex()) const;
  10. 		int columnCount(const QModelIndex &parent = QModelIndex()) const;
  11. 		QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
  12. 		QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
  13.  
  14. 		IdStatsMap idStats;
  15. 	public slots:
  16. 		void updateStats(const QVcaCanMsg &canmsg);
  17. 	public:
  18. 		MsgStatsModel(QObject *parent = 0);
  19. 		~MsgStatsModel();
  20. };
  21.  
  22. MsgStatsModel::MsgStatsModel(QObject *parent)
  24. {
  25. 	// std::cout <<"Model Created!"<<"\n";
  26. }
  27.  
  28. MsgStatsModel::~MsgStatsModel()
  29. {
  30.  
  31. 	// std::cout <<"Model Destroyed!"<<"\n";
  32.  
  33. }
  34.  
  35. int MsgStatsModel::rowCount(const QModelIndex &parent) const
  36. {
  37. 	Q_UNUSED(parent);
  38. 	return idStats.size();
  39.  
  40. }
  41.  
  42. int MsgStatsModel::columnCount(const QModelIndex &parent) const
  43. {
  44. 	Q_UNUSED(parent);
  45. 	return 3;
  46.  
  47. }
  48.  
  49. QVariant MsgStatsModel::headerData(int section, Qt::Orientation orientation, int role) const
  50. {
  51. 	QVariant ret = QAbstractTableModel::headerData(section, orientation, role);
  52. 	if(orientation == Qt::Horizontal){
  53. 		if(role == Qt::DisplayRole){
  54. 			switch(section){
  55. 				case 0 :
  56. 					return tr("ID");
  57. 					break;
  58. 				case 1:
  59. 					return tr("Count");
  60. 					break;
  61. 				case 2 :
  62. 					return tr("Comment");
  63. 					break;
  64. 				default :
  65. 					break;
  66. 			}
  67. 		}
  68. 	}
  69. 	return ret;
  70. }
  71.  
  72. QVariant MsgStatsModel::data(const QModelIndex &index, int role) const
  73. {
  74.  
  75. 	QVariant ret;
  76.  
  77. 	if(!index.isValid()){
  78. 		std::cout <<"Invalid Index of data provided!"<< std::endl;
  79. 		return ret;
  80. 	}
  81. 	QList<int> keys = idStats.keys();
  82.  
  83. 	int row = index.row();
  84. 	int col = index.column();
  85.  
  86. 	if(row >= 0 && row < rowCount()) {
  87. 		if(role == Qt::DisplayRole) {
  88. 			int key = keys[row];
  89. 			int count = idStats.value(key);
  90. 			switch(col) {
  91. 				case 0 :
  92. 					ret = key;
  93. 					break;
  94. 				case 1:
  95. 					ret = count;
  96. 					break;
  97. 			}
  98. 		}
  99. 	}
  100. 	return ret;
  101. }
  102.  
  103. void MsgStatsModel::updateStats(const QVcaCanMsg &canmsg)
  104. {
  105. 	qDebug()<< "WE GET UPDATE!";
  106. 	int key = canmsg.id();
  107. 	int old_row_count = idStats.size();
  108. 	if(idStats.contains(key)){
  109. 		int count = idStats.value(key);
  110. 		qDebug() <<"KEY IS: " << key<<"COUNT IS: " <<count;
  111. 		idStats[key] = count+1;
  112. 	} else {
  113. 		beginInsertRows(QModelIndex(), old_row_count, old_row_count);
  114. 		idStats.insert(key, 1);
  115. 		endInsertRows();
  116. 	}
  117. }
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