include/GaudiPython/CallbackStreamBuf.h

0001 /***********************************************************************************\
0002 * (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
0003 *                                                                                   *
0004 * This software is distributed under the terms of the Apache version 2 licence,     *
0005 * copied verbatim in the file "LICENSE".                                            *
0006 *                                                                                   *
0007 * In applying this licence, CERN does not waive the privileges and immunities       *
0008 * granted to it by virtue of its status as an Intergovernmental Organization        *
0009 * or submit itself to any jurisdiction.                                             *
0010 \***********************************************************************************/
0011 #ifndef GAUDIPYTHON_CALLBACKSTREAMBUF_H
0012 #define GAUDIPYTHON_CALLBACKSTREAMBUF_H
0013 // ============================================================================
0014 #include "Python.h" //included for the python API
0015 // ============================================================================
0016 #include <array>
0017 #include <sstream> //included for stringbuf
0018 // ============================================================================
0019 #include "GaudiKernel/Kernel.h"
0020 #include "GaudiPython/GaudiPython.h"
0021 // ============================================================================
0022
0023 namespace GaudiPython {
0024   int GAUDI_API call_python_method( PyObject* self, const char* method, char* buf );
0025
0026   class GAUDI_API CallbackStreamBuf : public std::stringbuf {
0027   private:
0028     class PyObject_t {
0029       PyObject* m_obj;
0030
0031     public:
0032       PyObject_t( PyObject* obj = nullptr ) : m_obj( obj ) {
0033         if ( m_obj ) Py_INCREF( m_obj );
0034       }
0035       ~PyObject_t() {
0036         if ( m_obj ) Py_DECREF( m_obj );
0037       }
0038       PyObject* get() { return m_obj; }
0039     };
0040     PyObject_t            m_self;
0041     std::array<char, 512> m_callbackBuff; // used for passing the flushed chars in the python callback
0042
0043   public:
0044     CallbackStreamBuf( PyObject* self );
0045     int sync() override;
0046   };
0047 } // namespace GaudiPython
0048
0049 #endif