{"id":99,"date":"2008-03-04T15:48:50","date_gmt":"2008-03-04T15:48:50","guid":{"rendered":""},"modified":"2008-03-04T15:48:50","modified_gmt":"2008-03-04T15:48:50","slug":"99","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=99","title":{"rendered":"\u6865\u63a5\u6a21\u5f0f(Bridge Pattern)"},"content":{"rendered":"

\u4e00\u3001 \u6865\u6881\uff08Bridge\uff09\u6a21\u5f0f
\u6865\u6881\u6a21\u5f0f\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u6a21\u5f0f\uff0c\u4e5f\u662f\u6bd4\u8f83\u590d\u6742\u7684\u4e00\u4e2a\u6a21\u5f0f\u3002\u719f\u6089\u8fd9\u4e2a\u6a21\u5f0f\u5bf9\u4e8e\u7406\u89e3\u9762\u5411\u5bf9\u8c61\u7684\u8bbe\u8ba1\u539f\u5219\uff0c\u5305\u62ec”\u5f00\uff0d\u95ed”\u539f\u5219(OCP)\u4ee5\u53ca\u7ec4\u5408\/\u805a\u5408\u590d\u7528\u539f\u5219(CARP)\u90fd\u5f88\u6709\u5e2e\u52a9\u3002\u7406\u89e3\u597d\u8fd9\u4e24\u4e2a\u539f\u5219\uff0c\u6709\u52a9\u4e8e\u5f62\u6210\u6b63\u786e\u7684\u8bbe\u8ba1\u601d\u60f3\u548c\u57f9\u517b\u826f\u597d\u7684\u8bbe\u8ba1\u98ce\u683c\u3002<\/p>\n

\u6865\u6881\u6a21\u5f0f\u7684\u7528\u610f<\/p>\n

\u3010GOF95\u3011\u5728\u63d0\u51fa\u6865\u6881\u6a21\u5f0f\u7684\u65f6\u5019\u6307\u51fa\uff0c\u6865\u6881\u6a21\u5f0f\u7684\u7528\u610f\u662f”\u5c06\u62bd\u8c61\u5316(Abstraction)\u4e0e\u5b9e\u73b0\u5316(Implementation)\u8131\u8026\uff0c\u4f7f\u5f97\u4e8c\u8005\u53ef\u4ee5\u72ec\u7acb\u5730\u53d8\u5316”\u3002\u8fd9\u53e5\u8bdd\u6709\u4e09\u4e2a\u5173\u952e\u8bcd\uff0c\u4e5f\u5c31\u662f\u62bd\u8c61\u5316\u3001\u5b9e\u73b0\u5316\u548c\u8131\u8026\u3002<\/p>\n

\u62bd\u8c61\u5316<\/p>\n

\u5b58\u5728\u4e8e\u591a\u4e2a\u5b9e\u4f53\u4e2d\u7684\u5171\u540c\u7684\u6982\u5ff5\u6027\u8054\u7cfb\uff0c\u5c31\u662f\u62bd\u8c61\u5316\u3002\u4f5c\u4e3a\u4e00\u4e2a\u8fc7\u7a0b\uff0c\u62bd\u8c61\u5316\u5c31\u662f\u5ffd\u7565\u4e00\u4e9b\u4fe1\u606f\uff0c\u4ece\u800c\u628a\u4e0d\u540c\u7684\u5b9e\u4f53\u5f53\u505a\u540c\u6837\u7684\u5b9e\u4f53\u5bf9\u5f85\u3010LISKOV94\u3011\u3002<\/p>\n

\u5b9e\u73b0\u5316<\/p>\n

\u62bd\u8c61\u5316\u7ed9\u51fa\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u5c31\u662f\u5b9e\u73b0\u5316\u3002<\/p>\n

\u8131\u8026<\/p>\n

\u6240\u8c13\u8026\u5408\uff0c\u5c31\u662f\u4e24\u4e2a\u5b9e\u4f53\u7684\u884c\u4e3a\u7684\u67d0\u79cd\u5f3a\u5173\u8054\u3002\u800c\u5c06\u5b83\u4eec\u7684\u5f3a\u5173\u8054\u53bb\u6389\uff0c\u5c31\u662f\u8026\u5408\u7684\u89e3\u8131\uff0c\u6216\u79f0\u8131\u8026\u3002\u5728\u8fd9\u91cc\uff0c\u8131\u8026\u662f\u6307\u5c06\u62bd\u8c61\u5316\u548c\u5b9e\u73b0\u5316\u4e4b\u95f4\u7684\u8026\u5408\u89e3\u8131\u5f00\uff0c\u6216\u8005\u8bf4\u662f\u5c06\u5b83\u4eec\u4e4b\u95f4\u7684\u5f3a\u5173\u8054\u6539\u6362\u6210\u5f31\u5173\u8054\u3002<\/p>\n

\u5c06\u4e24\u4e2a\u89d2\u8272\u4e4b\u95f4\u7684\u7ee7\u627f\u5173\u7cfb\u6539\u4e3a\u805a\u5408\u5173\u7cfb\uff0c\u5c31\u662f\u5c06\u5b83\u4eec\u4e4b\u95f4\u7684\u5f3a\u5173\u8054\u6539\u6362\u6210\u4e3a\u5f31\u5173\u8054\u3002\u56e0\u6b64\uff0c\u6865\u6881\u6a21\u5f0f\u4e2d\u7684\u6240\u8c13\u8131\u8026\uff0c\u5c31\u662f\u6307\u5728\u4e00\u4e2a\u8f6f\u4ef6\u7cfb\u7edf\u7684\u62bd\u8c61\u5316\u548c\u5b9e\u73b0\u5316\u4e4b\u95f4\u4f7f\u7528\u7ec4\u5408\/\u805a\u5408\u5173\u7cfb\u800c\u4e0d\u662f\u7ee7\u627f\u5173\u7cfb\uff0c\u4ece\u800c\u4f7f\u4e24\u8005\u53ef\u4ee5\u76f8\u5bf9\u72ec\u7acb\u5730\u53d8\u5316\u3002\u8fd9\u5c31\u662f\u6865\u6881\u6a21\u5f0f\u7684\u7528\u610f\u3002<\/p>\n

\u4e8c\u3001 \u6865\u6881\u6a21\u5f0f\u7684\u7ed3\u6784
\u6865\u6881\u6a21\u5f0f\u3010GOF95\u3011\u662f\u5bf9\u8c61\u7684\u7ed3\u6784\u6a21\u5f0f\uff0c\u53c8\u79f0\u4e3a\u67c4\u4f53(Handle and Body)\u6a21\u5f0f\u6216\u63a5\u53e3(Interface)\u6a21\u5f0f\u3002<\/p>\n

\u4e0b\u56fe\u6240\u793a\u5c31\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86\u6865\u6881\u6a21\u5f0f\u7684\u793a\u610f\u6027\u7cfb\u7edf\u7684\u7ed3\u6784\u56fe\u3002

\u53ef\u4ee5\u770b\u51fa\uff0c\u8fd9\u4e2a\u7cfb\u7edf\u542b\u6709\u4e24\u4e2a\u7b49\u7ea7\u7ed3\u6784\uff0c\u4e5f\u5c31\u662f\uff1a<\/p>\n

\u7531\u62bd\u8c61\u5316\u89d2\u8272\u548c\u4fee\u6b63\u62bd\u8c61\u5316\u89d2\u8272\u7ec4\u6210\u7684\u62bd\u8c61\u5316\u7b49\u7ea7\u7ed3\u6784\u3002
\u7531\u5b9e\u73b0\u5316\u89d2\u8272\u548c\u4e24\u4e2a\u5177\u4f53\u5b9e\u73b0\u5316\u89d2\u8272\u6240\u7ec4\u6210\u7684\u5b9e\u73b0\u5316\u7b49\u7ea7\u7ed3\u6784\u3002
\u6865\u6881\u6a21\u5f0f\u6240\u6d89\u53ca\u7684\u89d2\u8272\u6709\uff1a<\/p>\n

\u62bd\u8c61\u5316(Abstraction)\u89d2\u8272\uff1a\u62bd\u8c61\u5316\u7ed9\u51fa\u7684\u5b9a\u4e49\uff0c\u5e76\u4fdd\u5b58\u4e00\u4e2a\u5bf9\u5b9e\u73b0\u5316\u5bf9\u8c61\u7684\u5f15\u7528\u3002
\u4fee\u6b63\u62bd\u8c61\u5316(Refined Abstraction)\u89d2\u8272\uff1a\u6269\u5c55\u62bd\u8c61\u5316\u89d2\u8272\uff0c\u6539\u53d8\u548c\u4fee\u6b63\u7236\u7c7b\u5bf9\u62bd\u8c61\u5316\u7684\u5b9a\u4e49\u3002
\u5b9e\u73b0\u5316(Implementor)\u89d2\u8272\uff1a\u8fd9\u4e2a\u89d2\u8272\u7ed9\u51fa\u5b9e\u73b0\u5316\u89d2\u8272\u7684\u63a5\u53e3\uff0c\u4f46\u4e0d\u7ed9\u51fa\u5177\u4f53\u7684\u5b9e\u73b0\u3002\u5fc5\u987b\u6307\u51fa\u7684\u662f\uff0c\u8fd9\u4e2a\u63a5\u53e3\u4e0d\u4e00\u5b9a\u548c\u62bd\u8c61\u5316\u89d2\u8272\u7684\u63a5\u53e3\u5b9a\u4e49\u76f8\u540c\uff0c\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e24\u4e2a\u63a5\u53e3\u53ef\u4ee5\u975e\u5e38\u4e0d\u4e00\u6837\u3002\u5b9e\u73b0\u5316\u89d2\u8272\u5e94\u5f53\u53ea\u7ed9\u51fa\u5e95\u5c42\u64cd\u4f5c\uff0c\u800c\u62bd\u8c61\u5316\u89d2\u8272\u5e94\u5f53\u53ea\u7ed9\u51fa\u57fa\u4e8e\u5e95\u5c42\u64cd\u4f5c\u7684\u66f4\u9ad8\u4e00\u5c42\u7684\u64cd\u4f5c\u3002
\u5177\u4f53\u5b9e\u73b0\u5316(Concrete Implementor)\u89d2\u8272\uff1a\u8fd9\u4e2a\u89d2\u8272\u7ed9\u51fa\u5b9e\u73b0\u5316\u89d2\u8272\u63a5\u53e3\u7684\u5177\u4f53\u5b9e\u73b0\u3002 <\/p>\n

\u4e09\u3001 \u6865\u6881\u6a21\u5f0f\u7684\u793a\u610f\u6027\u6e90\u4ee3\u7801
\/\/ Bridge pattern -- Structural example  
using System;<\/p>\n

\/\/ \"Abstraction\"
class Abstraction
{
  \/\/ Fields
  protected Implementor implementor;<\/p>\n

  \/\/ Properties
  public Implementor Implementor
  {
    set{ implementor = value; }
  }<\/p>\n

  \/\/ Methods
  virtual public void Operation()
  {
    implementor.Operation();
  }
}<\/p>\n

\/\/ \"Implementor\"
abstract class Implementor
{
  \/\/ Methods
  abstract public void Operation();
}<\/p>\n

\/\/ \"RefinedAbstraction\"
class RefinedAbstraction : Abstraction
{
  \/\/ Methods
  override public void Operation()
  {
    implementor.Operation();
  }
}<\/p>\n

\/\/ \"ConcreteImplementorA\"
class ConcreteImplementorA : Implementor
{
  \/\/ Methods
  override public void Operation()
  {
    Console.WriteLine(\"ConcreteImplementorA Operation\");
  }
}<\/p>\n

\/\/ \"ConcreteImplementorB\"
class ConcreteImplementorB : Implementor
{
  \/\/ Methods
  override public void Operation()
  {
    Console.WriteLine(\"ConcreteImplementorB Operation\");
  }
}<\/p>\n

\/**\/\/\/\/ <summary>
\/\/\/ Client test
\/\/\/ <\/summary>
public class Client
{
  public static void Main( string[] args )
  {
    Abstraction abstraction = new RefinedAbstraction();<\/p>\n

    \/\/ Set implementation and call
    abstraction.Implementor = new ConcreteImplementorA();
    abstraction.Operation();<\/p>\n

    \/\/ Change implemention and call
    abstraction.Implementor = new ConcreteImplementorB();
    abstraction.Operation();
  }
}
<\/code><\/p>\n

\u56db\u3001 \u8c03\u5236\u89e3\u8c03\u5668\u95ee\u9898
\u611f\u89c9\u300a\u654f\u6377\u8f6f\u4ef6\u5f00\u53d1\uff0d\u539f\u5219\u3001\u6a21\u5f0f\u4e0e\u5b9e\u8df5\u300b\u4e2d\u5173\u4e8eBridge\u6a21\u5f0f\u7684\u4f8b\u5b50\u5f88\u597d\u3002\uff08\u300aJava\u4e0e\u6a21\u5f0f\u300b\u4e00\u4e6633\u7ae0\u7684\u5bf9\u53d8\u5316\u7684\u5c01\u88c5\u4e00\u8282\u4e5f\u5199\u5f97\u5f88\u4e0d\u9519\uff0c\u63a8\u8350\u5927\u5bb6\u8bfb\u4e00\u8bfb\u3002\u5b83\u6df1\u5165\u7684\u9610\u8ff0\u4e86\u300aDesign Patterns Explained\u300b\u4e00\u4e66\u4e2d”1\uff09Design to interfaces. 2)Favor composition over inheritance. 3)Find what varies and encapsulate it”\u7684\u4e09\u4e2a\u89c2\u70b9\u3002\uff09\u3002

\u5982\u56fe\u6240\u793a\uff0c\u6709\u5927\u91cf\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u5728\u4f7f\u7528Modem\u63a5\u53e3\u3002Modem\u63a5\u53e3\u88ab\u51e0\u4e2a\u6d3e\u751f\u7c7bHayesModem\u3001USRoboticsModem\u548cEarniesModem\u5b9e\u73b0\u3002\u5b83\u5f88\u597d\u5730\u9075\u5faa\u4e86OCP\u3001LSP\u548cDIP\u3002\u5f53\u589e\u52a0\u65b0\u79cd\u7c7b\u7684\u8c03\u5236\u89e3\u8c03\u5668\u65f6\uff0c\u8c03\u5236\u89e3\u8c03\u5668\u7684\u5ba2\u6237\u7a0b\u5e8f\u4e0d\u4f1a\u53d7\u5f71\u54cd\u3002<\/p>\n

\u5047\u5b9a\u8fd9\u79cd\u60c5\u5f62\u6301\u7eed\u4e86\u51e0\u5e74\uff0c\u5e76\u6709\u8bb8\u591a\u8c03\u5236\u89e3\u8c03\u5668\u7684\u5ba2\u6237\u7a0b\u5e8f\u90fd\u5728\u4f7f\u7528\u7740Modem\u63a5\u53e3\u3002\u73b0\u51fa\u73b0\u4e86\u4e00\u79cd\u4e0d\u62e8\u53f7\u7684\u8c03\u5236\u89e3\u8c03\u5668\uff0c\u88ab\u79f0\u4e3a\u4e13\u7528\u8c03\u5236\u89e3\u8c03\u5668\u3002\u5b83\u4eec\u4f4d\u4e8e\u4e00\u6761\u4e13\u7528\u8fde\u63a5\u7684\u4e24\u7aef\u3002\u6709\u51e0\u4e2a\u65b0\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528\u8fd9\u4e9b\u4e13\u7528\u8c03\u5236\u89e3\u8c03\u5668\uff0c\u5b83\u4eec\u65e0\u9700\u62e8\u53f7\u3002\u6211\u4eec\u79f0\u8fd9\u4e9b\u4f7f\u7528\u8005\u4e3aDedUser\u3002\u4f46\u662f\uff0c\u5ba2\u6237\u5e0c\u671b\u5f53\u524d\u6240\u6709\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u90fd\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u4e13\u7528\u8c03\u5236\u89e3\u8c03\u5668\u3002\u4ed6\u4eec\u4e0d\u5e0c\u671b\u53bb\u66f4\u6539\u8bb8\u8bb8\u591a\u591a\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u5e94\u7528\u7a0b\u5e8f\uff0c\u6240\u4ee5\u5b8c\u5168\u53ef\u4ee5\u8ba9\u8fd9\u4e9b\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u53bb\u62e8\u4e00\u4e9b\u5047(dummy)\u7535\u8bdd\u53f7\u7801\u3002<\/p>\n

\u5982\u679c\u80fd\u9009\u62e9\u7684\u8bdd\uff0c\u6211\u4eec\u4f1a\u628a\u7cfb\u7edf\u7684\u8bbe\u8ba1\u66f4\u6539\u4e3a\u4e0b\u56fe\u6240\u793a\u7684\u90a3\u6837\u3002

\u6211\u4eec\u628a\u62e8\u53f7\u548c\u901a\u4fe1\u529f\u80fd\u5206\u79bb\u4e3a\u4e24\u4e2a\u4e0d\u540c\u7684\u63a5\u53e3\u3002\u539f\u6765\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5b9e\u73b0\u8fd9\u4e24\u4e2a\u63a5\u53e3\uff0c\u800c\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u4f7f\u7528\u8fd9\u4e24\u4e2a\u63a5\u53e3\u3002DedUser\u53ea\u4f7f\u7528Modem\u63a5\u53e3\uff0c\u800cDedicateModem\u53ea\u5b9e\u73b0Modem\u63a5\u53e3\u3002\u4f46\u8fd9\u6837\u505a\u4f1a\u8981\u6c42\u6211\u4eec\u66f4\u6539\u6240\u6709\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f–\u8fd9\u662f\u5ba2\u6237\u4e0d\u5141\u8bb8\u7684\u3002<\/p>\n

\u4e00\u4e2a\u53ef\u80fd\u7684\u89e3\u51b3\u65b9\u6848\u662f\u8ba9DedicatedModem\u4eceModem\u6d3e\u751f\u5e76\u4e14\u628adial\u65b9\u6cd5\u548changup\u65b9\u6cd5\u5b9e\u73b0\u4e3a\u7a7a\uff0c\u5c31\u50cf\u4e0b\u9762\u8fd9\u6837\uff1a

\u51e0\u4e2a\u6708\u540e\uff0c\u5df2\u7ecf\u6709\u4e86\u5927\u91cf\u7684DedUser\uff0c\u6b64\u65f6\u5ba2\u6237\u63d0\u51fa\u4e86\u4e00\u4e2a\u65b0\u7684\u66f4\u6539\u3002\u4e3a\u4e86\u80fd\u62e8\u56fd\u9645\u7535\u8bdd\u53f7\u7801\u3001\u4fe1\u7528\u5361\u7535\u8bdd\u3001PIN\u6807\u8bc6\u7535\u8bdd\u7b49\u7b49\uff0c\u5fc5\u4fee\u5bf9\u73b0\u6709dial\u4e2d\u4f7f\u7528char[10]\u5b58\u50a8\u53f7\u7801\u6539\u4e3a\u80fd\u591f\u62e8\u6253\u4efb\u610f\u957f\u5ea6\u7684\u7535\u8bdd\u53f7\u7801\u3002<\/p>\n

\u663e\u7136\uff0c\u6240\u6709\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u90fd\u5fc5\u987b\u66f4\u6539\u3002\u5ba2\u6237\u540c\u610f\u4e86\u5bf9\u8c03\u5236\u89e3\u8c03\u5668\u5ba2\u6237\u7a0b\u5e8f\u7684\u66f4\u6539\uff0c\u56e0\u4e3a\u4ed6\u4eec\u522b\u65e0\u9009\u62e9\u3002\u7cdf\u7cd5\u7684\u662f\uff0c\u73b0\u5728\u5fc5\u987b\u8981\u53bb\u544a\u8bc9DedUser\u7684\u7f16\u5199\u8005\uff0c\u4ed6\u4eec\u5fc5\u987b\u8981\u66f4\u6539\u4ed6\u4eec\u7684\u4ee3\u7801\uff01\u4f60\u53ef\u4ee5\u60f3\u8c61\u4ed6\u4eec\u542c\u5230\u8fd9\u4e2a\u4f1a\u6709\u591a\u9ad8\u5174\u3002\u672c\u6765\u4ed6\u4eec\u662f\u4e0d\u7528\u8c03\u7528dial\u7684\u3002<\/p>\n

\u8fd9\u5c31\u662f\u8bb8\u591a\u9879\u76ee\u90fd\u4f1a\u5177\u6709\u7684\u90a3\u79cd\u6709\u5bb3\u7684\u6df7\u4e71\u4f9d\u8d56\u5173\u7cfb\u3002\u7cfb\u7edf\u67d0\u4e00\u90e8\u5206\u4e2d\u7684\u4e00\u4e2a\u6742\u51d1\u4f53(kludge)\u521b\u5efa\u4e86\u4e00\u4e2a\u6709\u5bb3\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u6700\u7ec8\u5bfc\u81f4\u7cfb\u7edf\u4e2d\u5b8c\u5168\u65e0\u5173\u7684\u90e8\u5206\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n

\u5982\u679c\u4f7f\u7528ADAPTER\u6a21\u5f0f\u89e3\u51b3\u6700\u521d\u7684\u95ee\u9898\u7684\u8bdd\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u4e25\u91cd\u95ee\u9898\u3002\u5982\u56fe\uff1a

\u8bf7\u6ce8\u610f\uff0c\u6742\u51d1\u4f53\u4ecd\u7136\u5b58\u5728\u3002\u9002\u914d\u5668\u4ecd\u7136\u8981\u6a21\u62df\u8fde\u63a5\u72b6\u6001\u3002\u7136\u800c\uff0c\u6240\u6709\u7684\u4f9d\u8d56\u5173\u7cfb\u90fd\u662f\u4ece\u9002\u914d\u5668\u53d1\u8d77\u7684\u3002\u6742\u51d1\u4f53\u548c\u7cfb\u7edf\u9694\u79bb\uff0c\u85cf\u8eab\u4e8e\u51e0\u4e4e\u65e0\u4eba\u77e5\u6653\u7684\u9002\u914d\u5668\u4e2d\u3002<\/p>\n

BRIDGE\u6a21\u5f0f<\/p>\n

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\u5728\u7c7b\u578b\u5c42\u6b21\u7ed3\u6784\u5177\u6709\u591a\u4e2a\u81ea\u7531\u5ea6\u7684\u60c5\u51b5\u4e2d\uff0cBRIDGE\u6a21\u5f0f\u901a\u5e38\u662f\u6709\u7528\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u628a\u8fd9\u4e9b\u5c42\u6b21\u7ed3\u6784\u5206\u5f00\u5e76\u901a\u8fc7\u6865\u628a\u5b83\u4eec\u7ed3\u5408\u5230\u4e00\u8d77\uff0c\u800c\u4e0d\u662f\u628a\u5b83\u4eec\u5408\u5e76\u8d77\u6765\u3002\u5982\u56fe\uff1a

\u6211\u4eec\u628a\u8c03\u5236\u89e3\u8c03\u5668\u7c7b\u5c42\u6b21\u7ed3\u6784\u5206\u6210\u4e24\u4e2a\u5c42\u6b21\u7ed3\u6784\u3002\u4e00\u4e2a\u8868\u793a\u8fde\u63a5\u65b9\u6cd5\uff0c\u53e6\u4e00\u4e2a\u8868\u793a\u786c\u4ef6\u3002<\/p>\n

\u8fd9\u4e2a\u7ed3\u6784\u867d\u7136\u590d\u6742\uff0c\u4f46\u662f\u5f88\u6709\u8da3\u3002\u5b83\u7684\u521b\u5efa\u4e0d\u4f1a\u5f71\u54cd\u5230\u8c03\u5236\u89e3\u8c03\u5668\u7684\u4f7f\u7528\u8005\uff0c\u5e76\u4e14\u8fd8\u5b8c\u5168\u5206\u79bb\u4e86\u8fde\u63a5\u7b56\u7565\u548c\u786c\u4ef6\u5b9e\u73b0\u3002ModemConnectController\u7684\u6bcf\u4e2a\u6d3e\u751f\u7c7b\u4ee3\u8868\u4e86\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5\u7b56\u7565\u3002\u5728\u8fd9\u4e2a\u7b56\u7565\u7684\u5b9e\u73b0\u4e2d\u53ef\u4ee5\u4f7f\u7528sendlmp\u3001receivelmp\u3001diallmp\u548changlmp\u3002\u65b0imp\u65b9\u6cd5\u7684\u589e\u52a0\u4e0d\u4f1a\u5f71\u54cd\u5230\u4f7f\u7528\u8005\u3002\u53ef\u4ee5\u4f7f\u7528ISP\u6765\u7ed9\u8fde\u63a5\u63a7\u5236\u7c7b\u589e\u52a0\u65b0\u7684\u63a5\u53e3\u3002\u8fd9\u79cd\u505a\u6cd5\u53ef\u4ee5\u521b\u5efa\u51fa\u4e00\u6761\u8fc1\u79fb\u8def\u5f84\uff0c\u8c03\u5236\u89e3\u8c03\u5668\u7684\u5ba2\u6237\u7a0b\u5e8f\u53ef\u4ee5\u6cbf\u7740\u8fd9\u6761\u8def\u5f84\u6162\u6162\u5730\u5f97\u5230\u4e00\u4e2a\u6bd4dial\u548changup\u5c42\u6b21\u66f4\u9ad8\u7684API\u3002<\/p>\n

\u4e94\u3001 \u53e6\u5916\u4e00\u4e2a\u5b9e\u9645\u5e94\u7528Bridge\u6a21\u5f0f\u7684\u4f8b\u5b50
\u8be5\u4f8b\u5b50\u6f14\u793a\u4e86\u4e1a\u52a1\u5bf9\u8c61\uff08BusinessObject\uff09\u901a\u8fc7Bridge\u6a21\u5f0f\u4e0e\u6570\u636e\u5bf9\u8c61\uff08DataObject\uff09\u89e3\u8026\u3002\u6570\u636e\u5bf9\u8c61\u7684\u5b9e\u73b0\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u5ba2\u6237\u7aef\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u52a8\u6001\u8fdb\u884c\u66f4\u6362\u3002
\/\/ Bridge pattern -- Real World example
using System;
using System.Collections;<\/p>\n

\/\/ \"Abstraction\"
class BusinessObject
{
  \/\/ Fields
  private DataObject dataObject;
  protected string group;<\/p>\n

  \/\/ Constructors
  public BusinessObject( string group )
  {
    this.group = group;
  }<\/p>\n

  \/\/ Properties
  public DataObject DataObject
  {
    set{ dataObject = value; }
    get{ return dataObject; }
  }<\/p>\n

  \/\/ Methods
  virtual public void Next()
  { dataObject.NextRecord(); }<\/p>\n

  virtual public void Prior()
  { dataObject.PriorRecord(); }<\/p>\n

  virtual public void New( string name )
  { dataObject.NewRecord( name ); }<\/p>\n

  virtual public void Delete( string name )
  { dataObject.DeleteRecord( name ); }<\/p>\n

  virtual public void Show()
  { dataObject.ShowRecord(); }<\/p>\n

  virtual public void ShowAll()
  {
    Console.WriteLine( \"Customer Group: {0}\", group );
    dataObject.ShowAllRecords();
  }
}<\/p>\n

\/\/ \"RefinedAbstraction\"
class CustomersBusinessObject : BusinessObject
{
  \/\/ Constructors
  public CustomersBusinessObject( string group )
    : base( group ){}<\/p>\n

  \/\/ Methods
  override public void ShowAll()
  {
    \/\/ Add separator lines
    Console.WriteLine();
    Console.WriteLine( \"------------------------\" );
    base.ShowAll();
    Console.WriteLine( \"------------------------\" );
  }
}<\/p>\n

\/\/ \"Implementor\"
abstract class DataObject
{
  \/\/ Methods
  abstract public void NextRecord();
  abstract public void PriorRecord();
  abstract public void NewRecord( string name );
  abstract public void DeleteRecord( string name );
  abstract public void ShowRecord();
  abstract public void ShowAllRecords();
}<\/p>\n

\/\/ \"ConcreteImplementor\"
class CustomersDataObject : DataObject
{
  \/\/ Fields
  private ArrayList customers = new ArrayList();
  private int current = 0;<\/p>\n

  \/\/ Constructors
  public CustomersDataObject()
  {
    \/\/ Loaded from a database
    customers.Add( \"Jim Jones\" );
    customers.Add( \"Samual Jackson\" );
    customers.Add( \"Allen Good\" );
    customers.Add( \"Ann Stills\" );
    customers.Add( \"Lisa Giolani\" );
  }<\/p>\n

  \/\/ Methods
  public override void NextRecord()
  {
    if( current <= customers.Count - 1 )
      current++;
  }<\/p>\n

  public override void PriorRecord()
  {
    if( current > 0 )
      current--;
  }<\/p>\n

  public override void NewRecord( string name )
  {
    customers.Add( name );
  }<\/p>\n

  public override void DeleteRecord( string name )
  {
    customers.Remove( name );
  }<\/p>\n

  public override void ShowRecord()
  {
    Console.WriteLine( customers[ current ] );
  }<\/p>\n

  public override void ShowAllRecords()
  {
    foreach( string name in customers )
      Console.WriteLine( \" \" + name );
  }
}<\/p>\n

\/**\/\/\/\/ <summary>
\/\/\/ Client test
\/\/\/ <\/summary>
public class BusinessApp
{
  public static void Main( string[] args )
  {
    \/\/ Create RefinedAbstraction
    CustomersBusinessObject customers =
      new CustomersBusinessObject(\" Chicago \");<\/p>\n

    \/\/ Set ConcreteImplementor
    customers.DataObject = new CustomersDataObject();<\/p>\n

    \/\/ Exercise the bridge
    customers.Show();
    customers.Next();
    customers.Show();
    customers.Next();
    customers.Show();
    customers.New( \"Henry Velasquez\" );<\/p>\n

    customers.ShowAll();
  }
}
<\/code><\/p>\n

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