X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=PPI%2FMonitorModule.hh;h=74e7600e0cc1f4a3d3a393fc4940fbf417827b78;hb=92f8630b75f3ef50e73c48cde58645dcd1534e27;hp=c5517eb807998692593b6a08111ae6d49611e205;hpb=8f0998b21459641c0e7e240946d58dc26280b631;p=senf.git

diff --git a/PPI/MonitorModule.hh b/PPI/MonitorModule.hh
index c5517eb..74e7600 100644
--- a/PPI/MonitorModule.hh
+++ b/PPI/MonitorModule.hh
@@ -37,16 +37,52 @@ namespace senf {
 namespace ppi {
 namespace module {
 
+    /** \brief Base class providing simple monitor %module support
+
+        A monitor %module is a \ref senf::ppi::module::Module "module" which needs information 
+        about traversing packets but does not really act on the packets. Because of this, it is 
+        \e optional to connect the output: If the output is not connected, the packets will be 
+        silently dropped.
+
+        This allows to add monitor modules either into an existing chain or add them using an
+        ActiveDuplicator. 
+
+        To write a monitor %module, derive from senf::ppi::module::MonitorModule instead of
+        senf::ppi::module and implement v_handlePacket():
+
+        \code
+        class CountPackets
+            : public senf::ppi::module::MonitorModule<>
+        {
+            SENF_PPI_MODULE(CountPackets);
+        public:
+            CountPackets() : counter_ (0u) {}
+
+        private:
+            virtual void v_handlePacket(Packet const & p)
+            { ++ counter_; }
+
+            unsigned counter_;
+        };
+        \endcode
+
+        You may of course add events (or even further connectors besides \c input and \c output
+        provided by MonitorModule) to the %module.
+
+        \tparam PacketType type of packet expected on input and sent on output. This is also the
+            type of the v_handlePacket() argument.
+     */
+    template <class PacketType=Packet>
     class MonitorModule : public Module
     {
     public:
-        senf::ppi::connector::PassiveInput<> input;
-        senf::ppi::connector::ActiveOutput<> output;
+        senf::ppi::connector::PassiveInput<PacketType> input;
+        senf::ppi::connector::ActiveOutput<PacketType> output;
 
     protected:
         MonitorModule();
 
-        virtual void v_handlePacket(Packet const & p) = 0;
+        virtual void v_handlePacket(PacketType const & p) = 0; ///< Called for each packet
 
     private:
         void request();
@@ -58,9 +94,9 @@ namespace module {
 }}}
 
 ///////////////////////////////hh.e////////////////////////////////////////
-#include "MonitorModule.cci"
-//#include "MonitorModule.ct"
-//#include "MonitorModule.cti"
+//#include "MonitorModule.cci"
+#include "MonitorModule.ct"
+#include "MonitorModule.cti"
 #endif