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       1             : //# Algorithm.h: defines base class Algorithm, a parallel computational unit
       2             : //# Copyright (C) 1999,2000
       3             : //# Associated Universities, Inc. Washington DC, USA.
       4             : //#
       5             : //# This library is free software; you can redistribute it and/or modify it
       6             : //# under the terms of the GNU Library General Public License as published by
       7             : //# the Free Software Foundation; either version 2 of the License, or (at your
       8             : //# option) any later version.
       9             : //#
      10             : //# This library is distributed in the hope that it will be useful, but WITHOUT
      11             : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12             : //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
      13             : //# License for more details.
      14             : //#
      15             : //# You should have received a copy of the GNU Library General Public License
      16             : //# along with this library; if not, write to the Free Software Foundation,
      17             : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
      18             : //#
      19             : //# Correspondence concerning AIPS++ should be addressed as follows:
      20             : //#        Internet email: aips2-request@nrao.edu.
      21             : //#        Postal address: AIPS++ Project Office
      22             : //#                        National Radio Astronomy Observatory
      23             : //#                        520 Edgemont Road
      24             : //#                        Charlottesville, VA 22903-2475 USA
      25             : //#
      26             : //#
      27             : //# $Id$
      28             : //#! ========================================================================
      29             : 
      30             : #ifndef SYNTHESIS_ALGORITHM_H
      31             : #define SYNTHESIS_ALGORITHM_H
      32             : 
      33             : //# Includes
      34             : #include <synthesis/Parallel/Applicator.h>
      35             : 
      36             : namespace casacore{
      37             : 
      38             : class String;
      39             : }
      40             : 
      41             : namespace casa { //# NAMESPACE CASA - BEGIN
      42             : 
      43             : //# Forward Declarations
      44             : 
      45             : extern Applicator applicator;
      46             : 
      47             : // <summary>
      48             : // Defines a computational unit for parallel processing
      49             : // </summary>
      50             : 
      51             : // <use visibility=local>   or   <use visibility=export>
      52             : 
      53             : // <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
      54             : // </reviewed>
      55             : 
      56             : // <prerequisite>
      57             : //   <li> SomeClass
      58             : //   <li> SomeOtherClass
      59             : //   <li> some concept
      60             : // </prerequisite>
      61             : //
      62             : // <etymology>
      63             : // </etymology>
      64             : //
      65             : // <synopsis>
      66             : // Base class used to define a computational unit for parallel processing.  
      67             : // The user supplies: i) the get() (fetch the data); ii) the task() (do 
      68             : // the work); iii) the put() (send the results back); and iv) the name()
      69             : // (name of the task).
      70             : // </synopsis>
      71             : //
      72             : // <example>
      73             : // </example>
      74             : //
      75             : // <motivation>
      76             : // The algorithm class is used for embarassingly- or nearly-embarassingly
      77             : // types of parallel problems.
      78             : // </motivation>
      79             : //
      80             : //
      81             : // <todo asof="1999/05/27">
      82             : //   <li> Document document document.
      83             : // </todo>
      84             : 
      85             : //
      86             : // Base class.  User always derives off this class
      87             : //
      88             : class Algorithm {
      89             :  public:
      90             :   // Default constructor and destructor
      91        1072 :   Algorithm() {}
      92        1071 :   virtual ~Algorithm(){}
      93             : 
      94             :   // Generic apply to execute the parallel task
      95        1064 :   void apply() { get();             // Get the input from the controller
      96        1064 :                  task();            // Do the work
      97        1064 :                  applicator.done(); // Signal that the work is done
      98        1064 :                  put();             // Return results to the controller
      99        1064 :   };
     100             : 
     101             :   // Get the input data and parameters from the controller
     102             :   virtual void get() = 0;
     103             : 
     104             :   // Return the results to the controller
     105             :   virtual void put() = 0;
     106             : 
     107             :   // Return the name of the algorithm
     108             :   virtual casacore::String &name() = 0;
     109             : 
     110             :  protected:
     111             :   // Do the work assigned as a parallel task
     112             :   virtual void task() = 0;
     113             : };
     114             : 
     115             : 
     116             : } //# NAMESPACE CASA - END
     117             : 
     118             : #endif
     119             : 
     120             : 
     121             : 
     122             : 
     123             :