MqContextC_Env_PY_API

MqContextC - protect and restore the service-environment … More...

Collaboration diagram for MqContextC_Env_PY_API:

Functions
static OT_ProcRet	pymqmsgque_MqContextC_EnvProtect (MqContextC_ARGS)
	Python: ctx.EnvProtect() → C-API protect the service-environment
static OT_ProcRet	pymqmsgque_MqContextC_EnvRestore (MqContextC_ARGS)
	Python: ctx.EnvRestore() → C-API restore the service-environment

Detailed Description

MqContextC - protect and restore the service-environment …

The "Env" style functions are used to secure the service-environment (defined in MqEnvS)
and is required.. under special conditions... to proper answer the original service call at the
end of the service-processing.
By default pymqmsgque guarantee the proper management of the environment on behalf of the user.
Under normal conditions the user don't need these functions.

The folllowing design-goals were defined:

• normal condition...
  • Every pymqmsgque function does protect the original service-environment by default
  • esay goal to remember: come-in == come-out
• special condition...
  • After loading the read-data-package...
    • from the database (with MqStorageImport)
    • from the dump file (with MqDumpImport)
  • the service-environment must be in the same condition as when the read-data-package was saved.

The two design-goals from above are in conflict and the both functions MqEnvProtect and MqEnvRestore are used to solve this conflict.

Example from server.py → protect the environment and import from database

      # PROTECT the original service-call
      self.EnvProtect()
      # OVERWRITE the original service-call with data from the database
      self.dump.Import(self)
      read = self.ReadALL()
      # RESTORE the original service-call
      self.EnvRestore()
      # ANSWER the original service-call
      self.Send("R", "L", read);

Function Documentation

pymqmsgque_MqContextC_EnvProtect()

static OT_ProcRet pymqmsgque_MqContextC_EnvProtect ( MqContextC_ARGS )

static

Python: ctx.EnvProtect() → C-API
protect the service-environment

Definition at line 1341 of file MqContextC_py.c.

                                                              {
  OT_SETUP_hdl;
  OT_SETUP_NOARG(EnvProtect_doc);
  OT_CHECK_NOARGS;
  MqEnvProtect (hdl);
  OT_retObj_SET_None;
  goto end;
  error:
  OT_retObj_SET_Error;
  end:
  OT_retObj_RETURN;
}

pymqmsgque_MqContextC_EnvRestore()

static OT_ProcRet pymqmsgque_MqContextC_EnvRestore ( MqContextC_ARGS )

static

Python: ctx.EnvRestore() → C-API
restore the service-environment

Definition at line 1355 of file MqContextC_py.c.

                                                              {
  OT_SETUP_hdl;
  OT_SETUP_NOARG(EnvRestore_doc);
  OT_CHECK_NOARGS;
  MqEnvRestore (hdl);
  OT_retObj_SET_None;
  goto end;
  error:
  OT_retObj_SET_Error;
  end:
  OT_retObj_RETURN;
}