中介者模式介绍
用一个中介对象封装一系列的对象交互，
-
中介者使各对象不需要显示地相互作用，从而使其耦合松散
-
而且可以独立地改变它们之间的交互。
-
Mediator 中介(IChatroom)
定义了一个与同事对象通信的接口
- ConcreteMediator 具体中介类(聊天室)
通过协调同事对象来实现协作行为
认识并维护同事
- Colleague classes 同事类(参与者)
每个同事类都知道它的Mediator对象
每个同事在本应与另一个同事沟通的时候，都会与调解人进行沟通
中介者模式
using UnityEngine;
using System.Collections;
public class MediatorStructure : MonoBehaviour
{
void Start()
{
ConcreteMediator m = new ConcreteMediator();
ConcreteColleague1 c1 = new ConcreteColleague1(m);
ConcreteColleague2 c2 = new ConcreteColleague2(m);
m.Colleague1 = c1;
m.Colleague2 = c2;
c1.Send("How are you?");
c2.Send("Fine, thanks");
}
}
/// <summary>
/// The 'Mediator' abstract class
/// </summary>
abstract class Mediator
{
public abstract void Send(string message,Colleague colleague);
}
/// <summary>
/// The 'ConcreteMediator' class
/// </summary>
class ConcreteMediator : Mediator
{
private ConcreteColleague1 _colleague1;
private ConcreteColleague2 _colleague2;
public ConcreteColleague1 Colleague1
{
set {
_colleague1 = value; }
}
public ConcreteColleague2 Colleague2
{
set {
_colleague2 = value; }
}
public override void Send(string message,Colleague colleague)
{
if (colleague == _colleague1)
{
_colleague2.Notify(message);
}
else
{
_colleague1.Notify(message);
}
}
}
/// <summary>
/// The 'Colleague' abstract class
/// </summary>
abstract class Colleague
{
protected Mediator mediator;
// Constructor
public Colleague(Mediator mediator)
{
this.mediator = mediator;
}
}
/// <summary>
/// A 'ConcreteColleague' class
/// </summary>
class ConcreteColleague1 : Colleague
{
// Constructor
public ConcreteColleague1(Mediator mediator)
: base(mediator)
{
}
public void Send(string message)
{
mediator.Send(message, this);
}
public void Notify(string message)
{
Debug.Log("Colleague1 gets message: "+ message);
}
}
/// <summary>
/// A 'ConcreteColleague' class
/// </summary>
class ConcreteColleague2 : Colleague
{
// Constructor
public ConcreteColleague2(Mediator mediator)
: base(mediator)
{
}
public void Send(string message)
{
mediator.Send(message, this);
}
public void Notify(string message)
{
Debug.Log("Colleague2 gets message: "+ message);
}
}
中介者模式案例1
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
//这段真实的代码演示了促进之间松散耦合通信的中介模式
//注册聊天室的不同参与者。 聊天室是所有交流发生的中心枢纽。
//此时，聊天室中只实现了一对一的通信，但如果改为一对多就很简单了。
namespace MediatorExample1
{
public class MediatorExample1 : MonoBehaviour
{
void Start()
{
// Create chatroom
Chatroom chatroom = new Chatroom();
// Create participants and register them
Participant George = new Beatle("George");
Participant Paul = new Beatle("Paul");
Participant Ringo = new Beatle("Ringo");
Participant John = new Beatle("John");
Participant Yoko = new NonBeatle("Yoko");
chatroom.Register(George);
chatroom.Register(Paul);
chatroom.Register(Ringo);
chatroom.Register(John);
chatroom.Register(Yoko);
// Chatting participants
Yoko.Send("John", "Hi John!");
Paul.Send("Ringo", "All you need is love");
Ringo.Send("George", "My sweet Lord");
Paul.Send("John", "Can't buy me love");
John.Send("Yoko", "My sweet love");
}
}
/// <summary>
/// The 'Mediator' abstract class
/// </summary>
abstract class AbstractChatroom
{
public abstract void Register(Participant participant);
public abstract void Send(string from, string to, string message);
}
/// <summary>
/// The 'ConcreteMediator' class
/// </summary>
class Chatroom : AbstractChatroom
{
private Dictionary<string, Participant> _participants =
new Dictionary<string, Participant>();
public override void Register(Participant participant)
{
if (!_participants.ContainsValue(participant))
{
_participants[participant.Name] = participant;
}
participant.Chatroom = this;
}
public override void Send( string from, string to, string message)
{
Participant participant = _participants[to];
if (participant != null)
{
participant.Receive(from, message);
}
}
}
/// <summary>
/// The 'AbstractColleague' class
/// </summary>
class Participant
{
private Chatroom _chatroom;
private string _name;
// Constructor
public Participant(string name)
{
this._name = name;
}
// Gets participant name
public string Name
{
get {
return _name; }
}
// Gets chatroom
public Chatroom Chatroom
{
set {
_chatroom = value; }
get {
return _chatroom; }
}
// Sends message to given participant
public void Send(string to, string message)
{
_chatroom.Send(_name, to, message);
}
// Receives message from given participant
public virtual void Receive(string from, string message)
{
Debug.Log(from + " to " + Name + ": '" + message + "'");
}
}
/// <summary>
/// A 'ConcreteColleague' class
/// </summary>
class Beatle : Participant
{
// Constructor
public Beatle(string name)
: base(name)
{
}
public override void Receive(string from, string message)
{
Debug.Log("To a Beatle: ");
base.Receive(from, message);
}
}
/// <summary>
/// A 'ConcreteColleague' class
/// </summary>
class NonBeatle : Participant
{
// Constructor
public NonBeatle(string name)
: base(name)
{
}
public override void Receive(string from, string message)
{
Debug.Log("To a non-Beatle: ");
base.Receive(from, message);
}
}
}
中介者模式案例2
复杂度 ***
/*
* 它用于处理相关对象(同事)之间的通信
* 所有通信都由中介处理同事之间不需要互相了解
* GOF:通过封装不同的对象集的方式允许松散耦合,相互互动和沟通。
* 允许操作每个对象集独立变化.
*
**/
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
namespace MediatorExample2
{
public class MediatorExample2 : MonoBehaviour
{
void Start ( )
{
StockMediator nyse = new StockMediator();
// 重要的是:
//在这个例子中，它们可能没有什么不同，但是
//它们可以是完全不同的对象，并计算出不同的东西
//但是仍然能够以同样简单的方式与调解员交谈
//这就是为什么我们这里有不同的对象:
GormanSlacks broker = new GormanSlacks(nyse);
JTPoorman broker2 = new JTPoorman(nyse);
nyse.AddColleague(broker);
nyse.AddColleague(broker2);
// 因为它们调用同一个中介对象上的方法，所以它们与同一个中介进行通信
//他处理所有的股票交易，并保持跟踪。 所以经纪人自己
//彼此一无所知。 这是件好事:-)
broker.SaleOffer(Stock.MSFT, 100);
broker.SaleOffer(Stock.GOOG, 50);
broker2.BuyOffer(Stock.MSFT, 100);
broker2.SaleOffer(Stock.NRG, 10);
broker.BuyOffer(Stock.NRG, 10);
broker.BuyOffer(Stock.NRG, 50);
nyse.PrintStockOfferings();
}
}
// I like using enums more than using strings
// because it prevents typos and I don't need to remember strings ;)
public enum Stock
{
MSFT,
GOOG,
NRG
};
public class StockOffer
{
public int stockShares {
get; private set; }
public Stock stock {
get; private set; }
public int colleagueCode {
get; private set; }
public StockOffer(int numOfShares, Stock stock, int collCode)
{
this.stockShares = numOfShares;
this.stock = stock;
this.colleagueCode = collCode;
}
}
public abstract class Colleague
{
private Mediator mediator;
private int colleagueCode;
public Colleague(Mediator mediator)
{
this.mediator = mediator;
}
public void SetCode(int code)
{
colleagueCode = code;
}
public void SaleOffer(Stock stock, int shares)
{
mediator.SaleOffer(stock, shares, this.colleagueCode);
}
public void BuyOffer(Stock stock, int shares)
{
mediator.BuyOffer(stock, shares, this.colleagueCode);
}
}
public class GormanSlacks : Colleague
{
// using : base() like here calls the constructor of the base class with the arguments passed in
// here it calls "Colleague(Mediator mediator)"
public GormanSlacks(Mediator mediator) : base(mediator)
{
Debug.Log("Gorman Slacks signed up with the stockexange");
}
}
public class JTPoorman : Colleague
{
public JTPoorman(Mediator mediator) : base(mediator)
{
Debug.Log("JT Poorman signed up with the stockexange");
}
}
public interface Mediator
{
void AddColleague(Colleague colleague);
void SaleOffer(Stock stock, int shares, int code);
void BuyOffer(Stock stock, int shares, int code);
}
public class StockMediator : Mediator
{
private List<Colleague> colleagues;
private List<StockOffer> buyOffers;
private List<StockOffer> sellOffers;
private int colleagueCodes = 0;
public StockMediator()
{
colleagues = new List<Colleague>();
buyOffers = new List<StockOffer>();
sellOffers = new List<StockOffer>();
}
#region Mediator implementation
public void AddColleague(Colleague colleague)
{
this.colleagues.Add(colleague);
colleagueCodes += 1;
colleague.SetCode(colleagueCodes);
}
public void SaleOffer(Stock stock, int shares, int code)
{
bool stockSold = false;
// see if someone is willing to buy:
for (int i = 0; i < buyOffers.Count; i++)
{
StockOffer offer = buyOffers[i];
// check if the stock is the same:
if (offer.stock == stock && offer.stockShares == shares)
{
Debug.Log(shares + " shares of " + stock + " stocks sold to colleague with code " + code);
buyOffers.Remove(offer);
stockSold = true;
}
if (stockSold) break;
}
if (!stockSold)
{
Debug.Log(shares + " shares of " + stock + " stocks added to inventory");
StockOffer offer = new StockOffer(shares, stock, code);
sellOffers.Add(offer);
}
}
public void BuyOffer(Stock stock, int shares, int code)
{
bool stockBought = false;
// see if someone is willing to buy:
for (int i = 0; i < sellOffers.Count; i++)
{
StockOffer offer = sellOffers[i];
// check if the stock is the same:
if (offer.stock == stock && offer.stockShares == shares)
{
Debug.Log(shares + " shares of " + stock + " stocks bought by colleague with code " + code);
sellOffers.Remove(offer);
stockBought = true;
}
if (stockBought) break;
}
if (!stockBought)
{
Debug.Log(shares + " shares of " + stock + " stocks added to inventory");
StockOffer offer = new StockOffer(shares, stock, code);
buyOffers.Add(offer);
}
}
#endregion
public void PrintStockOfferings()
{
Debug.Log("For Sale: " + sellOffers.Count);
foreach (StockOffer offer in sellOffers)
{
Debug.Log(offer.stock + " - " + offer.stockShares + " - " + offer.colleagueCode);
}
Debug.Log("For Buy: " + buyOffers.Count);
foreach (StockOffer offer in buyOffers)
{
Debug.Log(offer.stock + " - " + offer.stockShares + " - " + offer.colleagueCode);
}
}
}
}
转载：https://blog.csdn.net/weixin_38531633/article/details/117431993
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