move classes to separate files and startto build identity map.

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/humble/identity_map.rb b/lib/humble/identity_map.rb
new file mode 100644
index 0000000..b19db43
--- /dev/null
+++ b/lib/humble/identity_map.rb
@@ -0,0 +1,14 @@
+class IdentityMap
+  def initialize(items = {})
+    @items = items
+  end
+
+  def fetch(key, &block)
+    if @items.key?(key)
+      @items[key]
+    else
+      @items[key] = block.call
+      @items[key]
+    end
+  end
+end