From 9c063170984f1b026753b12cc238615ba5fd52bd Mon Sep 17 00:00:00 2001
From: ismayilmalik <ismayilturksoy@gmail.com>
Date: Tue, 23 Jan 2018 23:12:14 +0300
Subject: [PATCH] implemented decorator pattern

---
 concurrency/barrier/barrier.go    |  2 ++
 structural/decorator/decorator.go | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 concurrency/barrier/barrier.go
 create mode 100644 structural/decorator/decorator.go

diff --git a/concurrency/barrier/barrier.go b/concurrency/barrier/barrier.go
new file mode 100644
index 0000000..dd1f6a5
--- /dev/null
+++ b/concurrency/barrier/barrier.go
@@ -0,0 +1,2 @@
+package barrier
+
diff --git a/structural/decorator/decorator.go b/structural/decorator/decorator.go
new file mode 100644
index 0000000..d85b3ac
--- /dev/null
+++ b/structural/decorator/decorator.go
@@ -0,0 +1,31 @@
+package decorator
+
+import (
+	"os"
+	"io"
+	"fmt"
+	"net/http"
+)
+
+// simple http server
+type SimpleServer struct{
+	msg string
+}
+func (s *SimpleServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintln(w, s.msg)
+}
+
+// log decorator for simple server
+type ServerWithLog struct {
+	handler http.Handler
+	logger  io.Writer
+}
+func (s *ServerWithLog) ServeHTTP(w http.ResponseWriter, r *http.Request)  {
+	fmt.Fprintf(s.logger, "Got request with uri: %s \n", r.RequestURI)
+	s.handler.ServeHTTP(w, r)
+}
+
+func Demo(){
+	http.Handle("/", &ServerWithLog{&SimpleServer{"Simple server"}, os.Stdout})
+	http.ListenAndServe(":3000", nil)
+}