add abstract factory

Author: senghoo

05_abstract_factory/README.md

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+# 抽象工厂模式
+
+抽象工厂模式用于生成产品族的工厂，所生成的对象是有关联的。
+
+如果抽象工厂退化成生成的对象无关联则成为工厂函数模式。
+
+比如本例子中使用RDB和XML存储订单信息，抽象工厂分别能生成相关的主订单信息和订单详情信息。
+如果业务逻辑中需要替换使用的时候只需要改动工厂函数相关的类就能替换使用不同的存储方式了。

05_abstract_factory/abstractfactory.go

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+package abstractfactory
+
+//OrderMainDAO 为订单主记录
+type OrderMainDAO interface {
+	SaveOrderMain() string
+}
+
+//OrderDetailDAO 为订单详情纪录
+type OrderDetailDAO interface {
+	SaveOrderDetail() string
+}
+
+//DAOFactory DAO 抽象模式工厂接口
+type DAOFactory interface {
+	CreateOrderMainDAO() OrderMainDAO
+	CreateOrderDetailDAO() OrderDetailDAO
+}
+
+//RDBMainDAP 为关系型数据库的OrderMainDAO实现
+type RDBMainDAO struct{}
+
+//SaveOrderMain ...
+func (*RDBMainDAO) SaveOrderMain() string {
+	return "rdb main save"
+}
+
+//RDBDetailDAO 为关系型数据库的OrderDetailDAO实现
+type RDBDetailDAO struct{}
+
+// SaveOrderDetail ...
+func (*RDBDetailDAO) SaveOrderDetail() string {
+	return "rdb detail save"
+}
+
+//RDBDAOFactory 是RDB 抽象工厂实现
+type RDBDAOFactory struct{}
+
+func (*RDBDAOFactory) CreateOrderMainDAO() OrderMainDAO {
+	return &RDBMainDAO{}
+}
+
+func (*RDBDAOFactory) CreateOrderDetailDAO() OrderDetailDAO {
+	return &RDBDetailDAO{}
+}
+
+//XMLMainDAO XML存储
+type XMLMainDAO struct{}
+
+//SaveOrderMain ...
+func (*XMLMainDAO) SaveOrderMain() string {
+	return "xml main save"
+}
+
+//XMLDetailDAO XML存储
+type XMLDetailDAO struct{}
+
+// SaveOrderDetail ...
+func (*XMLDetailDAO) SaveOrderDetail() string {
+	return "xml detail save"
+}
+
+//XMLDAOFactory 是RDB 抽象工厂实现
+type XMLDAOFactory struct{}
+
+func (*XMLDAOFactory) CreateOrderMainDAO() OrderMainDAO {
+	return &XMLMainDAO{}
+}
+
+func (*XMLDAOFactory) CreateOrderDetailDAO() OrderDetailDAO {
+	return &XMLDetailDAO{}
+}

05_abstract_factory/abstractfactory_test.go

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+package abstractfactory
+
+import "testing"
+
+func getMainAndDetail(factory DAOFactory) (string, string) {
+	main := factory.CreateOrderMainDAO()
+	detail := factory.CreateOrderDetailDAO()
+	return main.SaveOrderMain(), detail.SaveOrderDetail()
+}
+
+func TestRdbFactory(t *testing.T) {
+	var factory DAOFactory
+	factory = &RDBDAOFactory{}
+	main, detail := getMainAndDetail(factory)
+	if main != "rdb main save" {
+		t.Fatal("main save fail")
+	}
+	if detail != "rdb detail save" {
+		t.Fatal("detail save fail")
+	}
+}
+
+func TestXmlFactory(t *testing.T) {
+	var factory DAOFactory
+	factory = &XMLDAOFactory{}
+	main, detail := getMainAndDetail(factory)
+	if main != "xml main save" {
+		t.Fatal("main save fail")
+	}
+	if detail != "xml detail save" {
+		t.Fatal("detail save fail")
+	}
+}