pattern chain of responsobility done

behavioral/chain_of_resposibility/chain_of_responsibility.go

@@ -0,0 +1,51 @@
+// Паттерн Цепочка ответственности (Chain Of Responsibility)
+//
+
+package chain_of_responsibility
+
+// Тип Handler, описывает интерфейс обработчиков в цепочки
+type Handler interface {
+	SendRequest(message int) string
+}
+
+// Тип ConcreteHandlerA, реализует обработчик "A"
+type ConcreteHandlerA struct {
+	Next Handler
+}
+
+func (self *ConcreteHandlerA) SendRequest(message int) (result string) {
+	if message == 1 {
+		result = "Im handler 1"
+	} else if self.Next != nil {
+		result = self.Next.SendRequest(message)
+	}
+	return
+}
+
+// Тип ConcreteHandlerB, реализует обработчик "B"
+type ConcreteHandlerB struct {
+	Next Handler
+}
+
+func (self *ConcreteHandlerB) SendRequest(message int) (result string) {
+	if message == 2 {
+		result = "Im handler 2"
+	} else if self.Next != nil {
+		result = self.Next.SendRequest(message)
+	}
+	return
+}
+
+// Тип ConcreteHandlerC, реализует обработчик "C"
+type ConcreteHandlerC struct {
+	Next Handler
+}
+
+func (self *ConcreteHandlerC) SendRequest(message int) (result string) {
+	if message == 3 {
+		result = "Im handler 3"
+	} else if self.Next != nil {
+		result = self.Next.SendRequest(message)
+	}
+	return
+}

behavioral/chain_of_resposibility/chain_of_responsibility_test.go

@@ -0,0 +1,22 @@
+package chain_of_responsibility
+
+import (
+	"testing"
+)
+
+func TestChainOfResponsibility(t *testing.T) {
+
+	expect := "Im handler 2"
+
+	handlers := &ConcreteHandlerA{
+		Next:&ConcreteHandlerB{
+			Next:&ConcreteHandlerC{},
+		},
+	}
+
+	result := handlers.SendRequest(2)
+
+	if result != expect {
+		t.Errorf("Expect result to equal %s, but %s.\n", expect, result)
+	}
+}

main.go

@@ -1,5 +1,17 @@
 package main
 
+import (
+	"fmt"
+	"github.com/NickTaporuk/golang_patterns/behavioral/chain_of_resposibility"
+)
+
 func main() {
-
+
+	handlers := &chain_of_responsibility.ConcreteHandlerA{
+		Next:&chain_of_responsibility.ConcreteHandlerB{
+			Next:&chain_of_responsibility.ConcreteHandlerC{},
+		},
+	}
+
+	fmt.Println(handlers.SendRequest(4))
 }