online_distribution/eventlibraries/dpipe_filter.h

0001 #ifndef __DPIPE_FILTER_H__
0002 #define __DPIPE_FILTER_H__
0003
0004 #include "Event.h"
0005 #include "msg_control.h"
0006
0007 class DpipeFilter;
0008
0009 void dpipe_register(DpipeFilter * );
0010 void dpipe_unregister(DpipeFilter *);
0011
0012 /** This is the pure virtual parent class for any dpipe filter
0013
0014 Upon loading, it registers itself with dpipe.
0015
0016 */
0017
0018
0019 class DpipeFilter
0020 {
0021
0022  public:
0023   DpipeFilter()
0024     {
0025       dpipe_register(this);
0026     }
0027
0028   virtual ~DpipeFilter()
0029     {
0030       dpipe_unregister(this);
0031     }
0032
0033   virtual int select (Event *e) = 0;
0034
0035   virtual const char * idString() const =0; // {return "generic dpipe filter";};
0036
0037
0038  protected:
0039
0040
0041 };
0042
0043
0044
0045 #endif /* __DPIPE_FILTER_H__ */