Initial commit

app/trading/matching/price_level.rb

@@ -0,0 +1,40 @@
+# encoding: UTF-8
+# frozen_string_literal: true
+
+module Matching
+  class PriceLevel
+
+    attr :price, :orders
+
+    def initialize(price)
+      @price  = price
+      @orders = []
+    end
+
+    def top
+      @orders.first
+    end
+
+    def empty?
+      @orders.empty?
+    end
+
+    def add(order)
+      unless find(order.id)
+        @orders << order
+      end
+    end
+
+    def total
+      @orders.map(&:volume).sum
+    end
+
+    def remove(order)
+      @orders.delete_if { |o| o.id == order.id }
+    end
+
+    def find(id)
+      @orders.find { |o| o.id == id }
+    end
+  end
+end