Cache file reads

lib/json_matchers/matcher.rb

@@ -19,6 +19,24 @@ def validation_failure_message
       errors.first.to_s
     end
 
+    class << self
+      attr_writer :document_store
+
+      def document_store
+        @document_store ||= begin
+          document_store = JsonSchema::DocumentStore.new
+
+          Dir.glob("#{JsonMatchers.schema_root}/**/*.json").
+            map { |path| Pathname.new(path) }.
+            map { |schema_path| Parser.new(schema_path).parse }.
+            map { |schema| document_store.add_schema(schema) }.
+            each { |schema| schema.expand_references!(store: document_store) }
+
+          document_store
+        end
+      end
+    end
+
     private
 
     attr_accessor :errors
@@ -29,15 +47,7 @@ def validator
     end
 
     def build_and_populate_document_store
-      document_store = JsonSchema::DocumentStore.new
-
-      Dir.glob("#{JsonMatchers.schema_root}/**/*.json").
-        map { |path| Pathname.new(path) }.
-        map { |schema_path| Parser.new(schema_path).parse }.
-        map { |schema| document_store.add_schema(schema) }.
-        each { |schema| schema.expand_references!(store: document_store) }
-
-      document_store
+      self.class.document_store
     end
   end
 end

spec/json_matchers/match_json_schema_spec.rb

@@ -59,6 +59,17 @@
     expect(json).to match_json_schema("api/v1/schema")
   end
 
+  it "does not reload document store" do
+    create(:schema, :location, name: "api/v1/schema")
+
+    json = build(:response, :location)
+
+    expect(Dir).to receive(:glob).once.and_call_original
+    2.times do
+      expect(json).to match_json_schema("api/v1/schema")
+    end
+  end
+
   it "supports invalidating the referenced schema when using local references" do
     create(:schema, name: "post", json: {
       "$schema": "https://json-schema.org/draft-04/schema#",

spec/spec_helper.rb

@@ -15,6 +15,7 @@
 
   config.around do |example|
     ensure_fixtures("spec", "fixtures", "schemas") do
+      JsonMatchers::Matcher.document_store = nil
       example.run
     end
   end

test/support/json_matchers/test_case.rb

@@ -9,6 +9,7 @@ class TestCase < ::Minitest::Test
 
     def setup
       @original_schema_root = setup_fixtures("test", "fixtures", "schemas")
+      JsonMatchers::Matcher.document_store = nil
     end
 
     def teardown