Skip to content

Commit 80889d3

Browse files
Eder DuranEder Duran
Eder Duran
authored and
Eder Duran
committed
Mediator design pattern
1 parent 13e8172 commit 80889d3

2 files changed

Lines changed: 165 additions & 0 deletions

File tree

‎src/Mediator/Conceptual/Output.txt‎

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,10 @@
1+
Client triggers operation A.
2+
Component 1 does A.
3+
Mediator reacts on A and triggers following operations:
4+
Component 2 does C.
5+
6+
Client triggers operation D.
7+
Component 2 does D.
8+
Mediator reacts on D and triggers following operations:
9+
Component 1 does B.
10+
Component 2 does C.

‎src/Mediator/Conceptual/main.cc‎

Lines changed: 155 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,155 @@
1+
2+
#include <string>
3+
#include <iostream>
4+
/**
5+
* EN: Mediator Design Pattern
6+
*
7+
* Intent: Lets you reduce chaotic dependencies between objects. The pattern
8+
* restricts direct communications between the objects and forces them to
9+
* collaborate only via a mediator object.
10+
*
11+
* RU: Паттерн Посредник
12+
*
13+
* Назначение: Позволяет уменьшить связанность множества классов между собой,
14+
* благодаря перемещению этих связей в один класс-посредник.
15+
*/
16+
17+
/**
18+
* EN: The Mediator interface declares a method used by components to notify the
19+
* mediator about various events. The Mediator may react to these events and
20+
* pass the execution to other components.
21+
*
22+
* RU: Интерфейс Посредника предоставляет метод, используемый компонентами для
23+
* уведомления посредника о различных событиях. Посредник может реагировать на
24+
* эти события и передавать исполнение другим компонентам.
25+
*/
26+
class BaseComponent;
27+
class Mediator
28+
{
29+
public:
30+
virtual void Notify(BaseComponent *sender, std::string event) const = 0;
31+
};
32+
33+
/**
34+
* EN: The Base Component provides the basic functionality of storing a
35+
* mediator's instance inside component objects.
36+
*
37+
* RU: Базовый Компонент обеспечивает базовую функциональность хранения
38+
* экземпляра посредника внутри объектов компонентов.
39+
*/
40+
class BaseComponent
41+
{
42+
protected:
43+
Mediator *mediator_;
44+
45+
public:
46+
BaseComponent(Mediator *mediator = nullptr) : mediator_(mediator)
47+
{
48+
}
49+
void set_mediator(Mediator *mediator)
50+
{
51+
this->mediator_ = mediator;
52+
}
53+
};
54+
55+
/**
56+
* EN: Concrete Components implement various functionality. They don't depend on
57+
* other components. They also don't depend on any concrete mediator classes.
58+
*
59+
* RU: Конкретные Компоненты реализуют различную функциональность. Они не
60+
* зависят от других компонентов. Они также не зависят от каких-либо конкретных
61+
* классов посредников.
62+
*/
63+
class Component1 : public BaseComponent
64+
{
65+
public:
66+
void DoA()
67+
{
68+
std::cout << "Component 1 does A.\n";
69+
this->mediator_->Notify(this, "A");
70+
}
71+
void DoB()
72+
{
73+
std::cout << "Component 1 does B.\n";
74+
this->mediator_->Notify(this, "B");
75+
}
76+
};
77+
78+
class Component2 : public BaseComponent
79+
{
80+
public:
81+
void DoC()
82+
{
83+
std::cout << "Component 2 does C.\n";
84+
this->mediator_->Notify(this, "C");
85+
}
86+
void DoD()
87+
{
88+
std::cout << "Component 2 does D.\n";
89+
this->mediator_->Notify(this, "D");
90+
}
91+
};
92+
93+
/**
94+
* EN: Concrete Mediators implement cooperative behavior by coordinating several
95+
* components.
96+
*
97+
* RU: Конкретные Посредники реализуют совместное поведение, координируя
98+
* отдельные компоненты.
99+
*/
100+
class ConcreteMediator : public Mediator
101+
{
102+
private:
103+
Component1 *component1_;
104+
Component2 *component2_;
105+
106+
public:
107+
ConcreteMediator(Component1 *c1, Component2 *c2) : component1_(c1), component2_(c2)
108+
{
109+
110+
this->component1_->set_mediator(this);
111+
this->component2_->set_mediator(this);
112+
}
113+
void Notify(BaseComponent *sender, std::string event) const override
114+
{
115+
if (event == "A")
116+
{
117+
std::cout << "Mediator reacts on A and triggers following operations:\n";
118+
this->component2_->DoC();
119+
}
120+
if (event == "D")
121+
{
122+
std::cout << "Mediator reacts on D and triggers following operations:\n";
123+
this->component1_->DoB();
124+
this->component2_->DoC();
125+
}
126+
}
127+
};
128+
129+
/**
130+
* EN: The client code.
131+
*
132+
* RU: Клиентский код.
133+
*/
134+
135+
void ClientCode()
136+
{
137+
Component1 *c1 = new Component1;
138+
Component2 *c2 = new Component2;
139+
ConcreteMediator *mediator = new ConcreteMediator(c1, c2);
140+
std::cout << "Client triggers operation A.\n";
141+
c1->DoA();
142+
std::cout << "\n";
143+
std::cout << "Client triggers operation D.\n";
144+
c2->DoD();
145+
146+
delete c1;
147+
delete c2;
148+
delete mediator;
149+
}
150+
151+
int main()
152+
{
153+
ClientCode();
154+
return 0;
155+
}

0 commit comments

Comments
 (0)