From dc7b102550b0a6b153740e9fd226da0a89a45f02 Mon Sep 17 00:00:00 2001
From: Brendan Smithyman <brendan@bitsmithy.net>
Date: Thu, 7 May 2015 13:33:03 -0400
Subject: [PATCH] Rough proposal design for Dispatcher/Problem interface.
 Refactor at will.

---
 SimPEG/Dispatcher.py | 112 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 SimPEG/Dispatcher.py

diff --git a/SimPEG/Dispatcher.py b/SimPEG/Dispatcher.py
new file mode 100644
index 00000000..393d6261
--- /dev/null
+++ b/SimPEG/Dispatcher.py
@@ -0,0 +1,112 @@
+### PROTOTYPE INTERFACE FOR PARALLEL DISPATCHER ###
+
+from functools import wraps
+
+def synchronize(fn):
+    @wraps(fn)
+    def wrapper(*args, **kwargs):
+        self = args[0]
+        
+        pr = isinstance(getattr(self, '_dispatcher', None), ParallelDispatcher)
+        if pr:
+            print('Parallel stuff: (start) %(prob)s.%(fn)s'%{'prob': self.__class__.__name__, 'fn': fn.__name__})
+
+        result =  fn(*args, **kwargs)
+        
+        if pr:
+            print('Parallel stuff: ( end ) %(prob)s.%(fn)s'%{'prob': self.__class__.__name__, 'fn': fn.__name__})
+        
+        return result
+
+    return wrapper
+
+
+class BaseDispatcher(object):
+    
+    def __init__(self, *args, **kwargs):
+        print('INIT: Dispatcher!')
+
+    def pair(self, problem):
+        self._prob = problem
+        print('PAIR: Dispatcher setup...')
+
+class SerialDispatcher(BaseDispatcher):
+    
+    def __init__(self, *args, **kwargs):
+        BaseDispatcher.__init__(self, *args, **kwargs)
+        print('INIT: Serial dispatcher...')
+
+class ParallelDispatcher(BaseDispatcher):
+
+    remoteOnly = ['someotherattribute']
+    
+    def __init__(self, *args, **kwargs):
+        BaseDispatcher.__init__(self, *args, **kwargs)
+        print('INIT: Parallel dispatcher...')
+
+    def pair(self, problem):
+        BaseDispatcher.pair(self, problem)
+        print('PAIR: Parallel dispatcher setup...')
+
+    def interceptSetattr(self, prob, name, value):
+        print('SET: Parallel dispatcher set %(prob)s.%(name)s = %(value)r'
+            %{'prob': prob.__class__.__name__, 'name': name, 'value': value})
+
+        if name in self.remoteOnly:
+            print('Setting remote state...')
+        else:
+            raise AttributeError('Set local copy!')
+
+    def interceptGetattr(self, prob, name):
+        print('GET: Parallel dispatcher get %(prob)s.%(name)s'
+            %{'prob': prob.__class__.__name__, 'name': name})
+
+        if name in self.remoteOnly:
+            return '***Value from remote state***'
+        else:
+            raise AttributeError('Attribute %s not in parallel namespace!'%(name,))
+
+class StandinSurvey(object):
+    
+    def pair(self, problem):
+        self._prob = problem
+        
+class StandinProblem(object):
+    
+    def __init__(self):
+        print('INIT: Problem!')
+        self._dispatcher = SerialDispatcher()
+
+    def __setattr__(self, name, value):
+        d = getattr(self, '_dispatcher', None)
+
+        if isinstance(d, ParallelDispatcher):
+            try:
+                d.interceptSetattr(self, name, value)
+            except AttributeError:
+                super(self.__class__, self).__setattr__(name, value)
+            finally:
+                return
+
+        else:
+            super(self.__class__, self).__setattr__(name, value)
+
+    def __getattr__(self, name):
+        d = super(self.__class__, self).__getattribute__('_dispatcher')
+
+        if isinstance(d, ParallelDispatcher):
+            return d.interceptGetattr(self, name)
+    
+    def pair(self, survey, dispatcher=None):
+        
+        self._survey = survey
+        self._survey.pair(self)
+        
+        if dispatcher is not None:
+            self._dispatcher = dispatcher
+            print('PAIR: Problem setup...')
+            self._dispatcher.pair(self)
+    
+    @synchronize
+    def dosomething(self):
+        print('Doing something!')
\ No newline at end of file