issue #56 - make topology class configure statement optional

lib/red_storm/simple_topology.rb

@@ -127,8 +127,14 @@ module RedStorm
       self.components << bolt
     end
 
+    # hook into the class lifecycle "inherited" method to automatically set the 
+    # topology class into the Configuration object.
+    # this now makes the topology configure block optional.
+    def self.inherited(subclass) 
+      Configuration.topology_class = subclass
+    end
+
     def self.configure(name = nil, &configure_block)
-      Configuration.topology_class = self
       @topology_name = name if name
       @configure_block = configure_block if block_given?
     end

spec/red_storm/simple_topology_spec.rb

@@ -32,6 +32,10 @@ describe RedStorm::SimpleTopology do
     Topology1.topology_name.should == "topology1"
   end
 
+  it "should set topology class in Configuration object" do
+    class UnconfiguredTopology < RedStorm::SimpleTopology; end
+    RedStorm::Configuration.topology_class.name.should == "UnconfiguredTopology"
+  end
 
   describe "interface" do
     it "should implement topology proxy" do