Change Proxy.py

Add some notes.

Structural/Proxy.py

@@ -1,31 +1,42 @@
 #!/usr/bin/env python
 # Written by: DGC
 
-#==============================================================================
-class Huge(object):
-
-    def __init__(self, filename):
-        self.read_variables(filename)
-
-    def read_variables(self, filename):
-        for i in range(1000000):
-            name = "var_" + str(i)
-            # would be read from filename
-            self.__setattr__(name, i)
-
-    def write_variables(self, filename):
-        print("Would write to " + filename)
+# http://sourcemaking.com/design_patterns/proxy
+# give 4 good reasons for a proxy to be made.
+
+# A virtual proxy is a placeholder for "expensive to create" objects. The real
+# object is only created when a client first requests/accesses the object.
+#
+# A remote proxy provides a local representative for an object that resides in
+# a different address space. This is what the "stub" code in RPC and CORBA 
+# provides.
+
+# A protective proxy controls access to a sensitive master object. The 
+# "surrogate" object checks that the caller has the access permissions required
+# prior to forwarding the request.
+
+# A smart proxy interposes additional actions when an object is accessed. 
+# Typical uses include: 
+#   o Counting the number of references to the real object so that it can be 
+#     freed automatically when there are no more references (aka smart pointer)
+#   o Loading a persistent object into memory when it's first referenced,
+#   o Checking that the real object is locked before it is accessed to ensure
+#     that no other object can change it.
+
 
 #==============================================================================
-class HugeProxy(object):
+class SharedData(object):
 
-    def __init__(self, filename):
-        self.data = Huge(filename)
+    def __init__(self):
+        self.resource = "A resource"
 
 #==============================================================================
-if (__name__ == "__main__"):
-    test_file_vars = Huge("Test File")
-    test_file_vars = HugeProxy("Test File")
-    test_file_vars = Huge("Test File")
-
+class AsyncProxy(object):
+
+    def __init__(self, data):
+        """ 
+        Takes some data which should now only be accessed through this class, 
+        otherwise you could get 
+        """
+        self.data = data