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什么是订阅发布者模式？简单的说，比如我看见有人在公交车上偷钱包，于是大叫一声“有人偷钱包”(发送消息)，车上的人听到（接收到消息）后做出相应的反应，比如看看自己的钱包什么的。其实就两个步骤，注册消息与发送消息。
为了适应项目需要，写了一个通用订阅发布者模式的通用模块，有了这样一个模块，项目里面其他模块之间的耦合性也将大大降低。
话不多说，直接上代码。
消息分发中心:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;/// <summary>
/// 消息分发中心.
/// </summary>
public class DispatcherCenter
{private static Logger logger = LogHelper.GetLogger("DispatcerCenter");private static DispatcherCenter instance;public static DispatcherCenter Instance{get{if (instance == null){instance = new DispatcherCenter();}return instance;}}private Dictionary<int, List<Observer>> map = new Dictionary<int, List<Observer>>();/// <summary>/// 发送消息./// </summary>/// <param name="type">消息类型.</param>/// <param name="msg">消息内容.</param>public void SendNotification(int type, object msg){if (map.ContainsKey(type)){List<Observer> observers = map[type];foreach (Observer obs in observers){Notification notice = new Notification(type, msg);if(obs.handler != null){obs.handler(notice);}}}else{if (msg == null){logger.Error("分发消息失败,未注册该消息！！！ Type: " + type + " Msg is null.");}else{logger.Error("分发消息失败,未注册该消息！！！ Type: " + type + " Msg: " + msg);}}}/// <summary>/// 注册消息./// </summary>/// <param name="type">消息类型.</param>/// <param name="handler">收到消息的回调.</param>public void RegisterObserver(int type, NotificationHandler handler){List<Observer> observers = null;if (map.TryGetValue(type, out observers)){foreach (Observer obs in observers){if (obs.handler == handler){//logger.Debug("该回调已经注册,不能重复注册！");return;}}observers.Add(new Observer(type, handler));}else{observers = new List<Observer>();observers.Add(new Observer(type, handler));map.Add(type, observers);}}/// <summary>/// 移除消息./// </summary>/// <param name="type">消息类型.</param>/// <param name="handler">收到消息的回调.</param>public void RemoveObserver(int type, NotificationHandler handler){List<Observer> observers = map[type];if (map.TryGetValue(type, out observers)){foreach (Observer obs in observers){if(obs.handler == handler){observers.Remove(obs);//bool result = observers.Remove(obs);//logger.Debug("消息移除是否成功: " + result);return;}}logger.Error("移除失败,未找到该回调！！！ Type: " + type);}else{logger.Error("移除失败,未注册该消息！！！ Type: " + type);}}
}
订阅者:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;//接收到消息的回调.
public delegate void NotificationHandler(Notification notice);/// <summary>
/// 观察者.
/// </summary>
public class Observer
{public NotificationHandler handler;public Observer() { }public Observer(int type, NotificationHandler handler){this.handler += handler;}
}
消息类:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;/// <summary>
/// 消息类.
/// </summary>
public class Notification
{private int type;private object msg;public int Type { get { return type; } }public object Msg { get { return msg; } }public Notification(int type, object msg){this.type = type;this.msg = msg;}public override string ToString(){if (msg != null){return string.Format("Type:{0} Msg:{1}", type, msg.ToString());}return string.Format("Type:{0} Msg is null", type);}
}
消息：（我用的是枚举表示，然后强转为int值来识别是哪个消息，枚举值不能重复）
/// <summary>
/// 消息枚举.
/// </summary>
public class NotificationEnum
{public enum ModelNotices{SEPARATE = 0,MERGE}public enum OtherNotice{OTHER1 = 101,OTHER2}
}
那么如何使用呢？
还是看代码,首先在Notifications中添加要注册的消息号，然后在合适时候调用RegisterNotifications()注册消息，在NotificationHandler()中根据消息号做出相应的操作。在不需要再观察消息的时候移除消息RemoveNotifications();
using UnityEngine;public class Test : MonoBehaviour
{private void Awake(){RegisterNotifications();}private void OnDestory(){RemoveNotifications();}private void Update(){if (Input.GetKeyDown(KeyCode.F1)){UnityEngine.Debug.Log("---------->>>> 分离消息.");//消息内容可以是任何东西，如int值，类 DispatcherCenter.Instance.SendNotification((int)NotificationEnum.ModelNotices.SEPARATE, null);}if (Input.GetKeyDown(KeyCode.F2)){UnityEngine.Debug.Log("---------->>>> 合并消息.");//消息内容可以是任何东西，如int值，类 DispatcherCenter.Instance.SendNotification((int)NotificationEnum.ModelNotices.MERGE, null);}//if (Input.GetKeyDown(KeyCode.F1))//{// Debug.Log("Test1 注册消息.");// RegisterNotifications();//}//if (Input.GetKeyDown(KeyCode.Keypad1))//{// Debug.Log("Test1 移除消息.");// RemoveNotifications();//}}#region 消息相关//需注册的消息. TODOprivate int[] Notifications{get{return new int[]{(int)NotificationEnum.ModelNotices.SEPARATE,(int)NotificationEnum.ModelNotices.MERGE};}}private void RegisterNotifications(){for (int i = 0; i < Notifications.Length; i++){DispatcherCenter.Instance.RegisterObserver(Notifications[i], NotificationHandler);}}private void RemoveNotifications(){for (int i = 0; i < Notifications.Length; i++){DispatcherCenter.Instance.RemoveObserver(Notifications[i], NotificationHandler);}}//收到消息的回调 TODOprivate void NotificationHandler(Notification notice){if (notice.Type == (int)NotificationEnum.ModelNotices.SEPARATE){UnityEngine.Debug.Log("Test1收到零件分离的消息." + notice.ToString());}else if (notice.Type == (int)NotificationEnum.ModelNotices.MERGE){UnityEngine.Debug.Log("Test1收到零件合并的消息." + notice.ToString());}}#endregion}
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