add facade pattern

Author: senghoo

.gitignore

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+### https://raw.github.com/github/gitignore/23aad6abc4ed1aafb425f6e09334c4e35ad146ac/Global/Emacs.gitignore
+
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+
+
+### https://raw.github.com/github/gitignore/23aad6abc4ed1aafb425f6e09334c4e35ad146ac/Go.gitignore
+
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+
+

00_simple_factory/00_simple_factory.test

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+# 外观模式
+
+API 为facade 模块的外观接口，大部分代码使用此接口简化对facade类的访问。
+
+facade模块同时暴露了a和b 两个Module 的NewXXX和interface，其它代码如果需要使用细节功能时可以直接调用。

01_facade/README.md

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+package facade
+
+import "fmt"
+
+func NewAPI() API {
+	return &apiImpl{
+		a: NewAModuleAPI(),
+		b: NewBModuleAPI(),
+	}
+}
+
+//API is facade interface of facade package
+type API interface {
+	Test() string
+}
+
+//facade implement
+type apiImpl struct {
+	a AModuleAPI
+	b BModuleAPI
+}
+
+func (a *apiImpl) Test() string {
+	aRet := a.a.TestA()
+	bRet := a.b.TestB()
+	return fmt.Sprintf("%s\n%s", aRet, bRet)
+}
+
+//NewAModuleAPI return new AModuleAPI
+func NewAModuleAPI() AModuleAPI {
+	return &aModuleImpl{}
+}
+
+//AModuleAPI ...
+type AModuleAPI interface {
+	TestA() string
+}
+
+type aModuleImpl struct{}
+
+func (*aModuleImpl) TestA() string {
+	return "A module running"
+}
+
+//NewBModuleAPI return new BModuleAPI
+func NewBModuleAPI() BModuleAPI {
+	return &bModuleImpl{}
+}
+
+//BModuleAPI ...
+type BModuleAPI interface {
+	TestB() string
+}
+
+type bModuleImpl struct{}
+
+func (*bModuleImpl) TestB() string {
+	return "B module running"
+}

01_facade/facade.go

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+package facade
+
+import "testing"
+
+var expect = "A module running\nB module running"
+
+// TestFacadeAPI ...
+func TestFacadeAPI(t *testing.T) {
+	api := NewAPI()
+	ret := api.Test()
+	if ret != expect {
+		t.Fatalf("expect %s, return %s", expect, ret)
+	}
+}