From 8abb383965786a3a4158b10268aa2cb7018daaee Mon Sep 17 00:00:00 2001
From: John Hartley <johnmatthewhartley@gmail.com>
Date: Wed, 31 Jul 2019 14:20:05 +0100
Subject: [PATCH] class to run the main FDTD algorithm

---
 gprMax/solver.py | 75 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 gprMax/solver.py

diff --git a/gprMax/solver.py b/gprMax/solver.py
new file mode 100644
index 00000000..6be7f1d0
--- /dev/null
+++ b/gprMax/solver.py
@@ -0,0 +1,75 @@
+# 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 gprMax.updates import CPUUpdates
+from gprMax.updates import SubGridsUpdates
+from gprMax.updates import GPUUpdates
+from gprMax.utilities import timer
+
+
+def create_solver(sim_config):
+    """Returns the configured solver."""
+    if sim_config.cpu:
+        from gprMax.Grid import FDTDGrid
+        G = FDTDGrid()
+        updates = CPUUpdates(G)
+
+    elif sim_config.gpu:
+        from gprMax.Grid import GPUGrid
+        G = GPUGrid()
+        updates = GPUUpdates(G)
+    else:
+        raise NotImplementedError
+
+    solver = Solver(updates, iterator)
+
+    return solver
+
+
+class Solver:
+
+    """Generic solver for Update objects"""
+
+    def __init__(self, updates, iterator):
+        """Context for the model to run in. Sub-class this with contexts
+        i.e. an MPI context.
+
+        Args:
+            updates (Updates): updates contains methods to run FDTD algorithm
+            iterator (iterator): can be range() or tqdm()
+        """
+        self.updates = updates
+        self.iterator = iterator
+
+    def solve(self):
+        """Time step the FDTD model."""
+        tsolvestart = timer()
+
+        for iteration in self.iterator:
+
+            self.updates.store_outputs(iteration)
+            self.updates.store_snapshots(iteration)
+            self.updates.update_magnetic()
+            self.updates.update_magnetic_pml()
+            self.updates.update_magnetic_sources(iteration)
+            self.updates.update_electric_a()
+            self.updates.update_electric_pml()
+            self.updates.update_electric_sources(iteration)
+            self.updates.update_electric_b()
+
+        tsolve = timer() - tsolvestart
+        return tsolve