reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/mvc/vuejs-todo-mvc/src/web/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"strings"
+
+	"github.com/kataras/iris/v12/_examples/mvc/vuejs-todo-mvc/src/todo"
+	"github.com/kataras/iris/v12/_examples/mvc/vuejs-todo-mvc/src/web/controllers"
+
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/mvc"
+	"github.com/kataras/iris/v12/sessions"
+	"github.com/kataras/iris/v12/websocket"
+)
+
+func main() {
+	app := iris.New()
+
+	// serve our app in public, public folder
+	// contains the client-side vue.js application,
+	// no need for any server-side template here,
+	// actually if you're going to just use vue without any
+	// back-end services, you can just stop afer this line and start the server.
+	app.HandleDir("/", "./public")
+
+	// configure the http sessions.
+	sess := sessions.New(sessions.Config{
+		Cookie: "iris_session",
+	})
+
+	// create a sub router and register the http controllers.
+	todosRouter := app.Party("/todos")
+
+	// create our mvc application targeted to /todos relative sub path.
+	todosApp := mvc.New(todosRouter)
+
+	// any dependencies bindings here...
+	todosApp.Register(
+		todo.NewMemoryService(),
+	)
+
+	todosController := new(controllers.TodoController)
+	// controllers registration here...
+	todosApp.Handle(todosController)
+
+	// Create a sub mvc app for websocket controller.
+	// Inherit the parent's dependencies.
+	todosWebsocketApp := todosApp.Party("/sync")
+	todosWebsocketApp.HandleWebsocket(todosController).
+		SetNamespace("todos").
+		SetEventMatcher(func(methodName string) (string, bool) {
+			return strings.ToLower(methodName), true
+		})
+
+	websocketServer := websocket.New(websocket.DefaultGorillaUpgrader, todosWebsocketApp)
+	idGenerator := func(ctx iris.Context) string {
+		id := sess.Start(ctx).ID()
+		return id
+	}
+	todosWebsocketApp.Router.Get("/", websocket.Handler(websocketServer, idGenerator))
+
+	// start the web server at http://localhost:8080
+	app.Listen(":8080")
+}