From 4c9a97a8ffa2ca72e3264d33e68647ce17ac697b Mon Sep 17 00:00:00 2001
From: John Hartley <johnmatthewhartley@gmail.com>
Date: Wed, 31 Jul 2019 13:44:43 +0100
Subject: [PATCH] contexts structure. run mpi, mpi no spawn or std.

---
 gprMax/contexts.py | 98 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 gprMax/contexts.py

diff --git a/gprMax/contexts.py b/gprMax/contexts.py
new file mode 100644
index 00000000..26a19198
--- /dev/null
+++ b/gprMax/contexts.py
@@ -0,0 +1,98 @@
+# Copyright (C) 2015-2019: The University of Edinburgh
+#                 Authors: Craig Warren and Antonis Giannopoulos
+#
+# This file is part of gprMax.
+#
+# gprMax is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# gprMax is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with gprMax.  If not, see <http://www.gnu.org/licenses/>.
+from .utilities import get_terminal_width
+import datetime
+
+class Context():
+
+    def __init__(self, sim_config, solver):
+        """Context for the model to run in. Sub-class this with contexts
+        i.e. an MPI context.
+
+        Args:
+            sim_config (SimConfig): Simulation level configuration object.
+            solver (Solver): FDTD general solver object.
+        """
+        self.sim_config = sim_config
+        self.solver = solver
+        self.model_range = range(self.sim_conf.model_start,
+                                 self.sim_conf.model_end)
+        self.tsimend = 0
+        self.tsimstart = 0
+
+    def run(self):
+        """Function to run the simulation in the correct context."""
+        self.tsimstart = timer()
+        self._run()
+        self.tsimend = timer()
+
+    def print_time_report(self):
+        """Function to print the total simulation time based on context."""
+        s = self.make_time_report(sim_time)
+        print(s)
+
+    def make_time_report(self):
+        """Function to generate a string for the total simulation time bas"""
+        pass
+
+
+class NoMPIContext(Context):
+
+    def _run(self):
+        """Specialise how the models are farmed out."""
+        for currentmodelrun in self.model_range:
+            # create the model configuration
+            model_config = object()
+            run_model(solver, sim_config, model_config)
+
+    def make_time_report(self):
+        """Function to specialise the time reporting for the standard Simulation
+        context."""
+        sim_time = datetime.timedelta(seconds=self.tsimend - self.tsimstart)
+        s = '\n=== Simulation on {} completed in [HH:MM:SS]: {}'
+        s = s.format(self.simconfig.hostinfo['hostname'], sim_time)
+        return '{} {}\n'.format(s, '=' * (get_terminal_width() - 1 - len(s)))
+
+
+class MPIContext(Context):
+
+    def _run(self):
+        pass
+
+    def make_time_report(self):
+        pass
+
+class MPINoSpawnContext(Context):
+
+    def _run(self):
+        pass
+
+    def make_time_report(self):
+        pass
+
+
+def create_context(sim_config, solver):
+    """Create a context in which to run the simulation. i.e MPI."""
+    if sim_config.mpi_no_spawn:
+        context = MPIContext(sim_config, solver)
+    elif sim_config.mpi:
+        context = MPINoSpawnContext(sim_config, solver)
+    else:
+        context = NoMPIContext(sim_conf, solver)
+
+    return context