{"id":1126,"date":"2023-03-16T21:26:08","date_gmt":"2023-03-16T13:26:08","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1126"},"modified":"2023-04-29T10:02:03","modified_gmt":"2023-04-29T02:02:03","slug":"design-pattern-mediator-pattern","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/16\/design-pattern-mediator-pattern\/","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\uff0817\uff09\u4e2d\u4ecb\u8005\u6a21\u5f0f"},"content":{"rendered":"<p>\u4e2d\u4ecb\u8005\u6a21\u5f0f\u4e5f\u79f0\u4e3a\u8c03\u89e3\u8005\u6a21\u5f0f\u6216\u8c03\u505c\u8005\u6a21\u5f0f\uff0c\u662f\u4e00\u79cd\u884c\u4e3a\u578b\u6a21\u5f0f\u3002<\/p>\n<h2>\u5b9a\u4e49<\/h2>\n<p><!-- more --><\/p>\n<p>\u4e2d\u4ecb\u8005\u6a21\u5f0f\u5305\u88c5\u4e86\u4e00\u7cfb\u5217\u5bf9\u8c61\u76f8\u4e92\u4f5c\u7528\u7684\u65b9\u5f0f\uff0c\u4f7f\u5f97\u8fd9\u4e9b\u5bf9\u8c61\u4e0d\u5fc5\u76f8\u4e92\u660e\u663e\u4f5c\u7528\uff0c\u4ece\u800c\u4f7f\u5b83\u4eec\u53ef\u4ee5\u677e\u6563\u8026\u5408\u3002\u5f53\u67d0\u4e9b\u5bf9\u8c61\u4e4b\u95f4\u7684\u4f5c\u7528\u53d1\u751f\u6539\u53d8\u65f6\uff0c\u4e0d\u4f1a\u7acb\u5373\u5f71\u54cd\u5176\u4ed6\u7684\u4e00\u4e9b\u5bf9\u8c61\u4e4b\u95f4\u7684\u4f5c\u7528\u3002\u4fdd\u8bc1\u8fd9\u4e9b\u4f5c\u7528\u53ef\u4ee5\u5f7c\u6b64\u72ec\u7acb\u7684\u53d8\u5316\u3002<\/p>\n<h2>\u4f7f\u7528\u573a\u666f<\/h2>\n<p>\u5f53\u5bf9\u8c61\u4e4b\u95f4\u7684\u4ea4\u4e92\u64cd\u4f5c\u5f88\u591a\u4e14\u6bcf\u4e2a\u5bf9\u8c61\u7684\u884c\u4e3a\u64cd\u4f5c\u90fd\u4f9d\u8d56\u5f7c\u6b64\u65f6\uff0c\u4e3a\u9632\u6b62\u5728\u4fee\u6539\u4e00\u4e2a\u5bf9\u8c61\u7684\u884c\u4e3a\u65f6\uff0c\u540c\u65f6\u6d89\u53ca\u5f88\u591a\u5176\u4ed6\u5bf9\u8c61\u7684\u884c\u4e3a\uff0c\u53ef\u4f7f\u7528\u4e2d\u4ecb\u8005\u6a21\u5f0f\u3002<\/p>\n<h2>UML\u7c7b\u56fe<\/h2>\n<p>\u8fd9\u91cc\u5199\u56fe\u7247\u63cf\u8ff0<\/p>\n<p>\uff081\uff09<code>Mediator<\/code>\uff1a\u62bd\u8c61\u4e2d\u4ecb\u8005\u89d2\u8272\uff0c\u5b9a\u4e49\u4e86\u540c\u4e8b\u5bf9\u8c61\u5230\u4e2d\u4ecb\u8005\u5bf9\u8c61\u7684\u63a5\u53e3\uff0c\u4e00\u822c\u4ee5\u62bd\u8c61\u7c7b\u7684\u65b9\u5f0f\u5b9e\u73b0\u3002<br \/>\n\uff082\uff09<code>ConcreteMediator<\/code>\uff1a\u5177\u4f53\u4e2d\u4ecb\u8005\u89d2\u8272\uff0c\u7ee7\u627f\u4e8e\u62bd\u8c61\u4e2d\u4ecb\u8005\uff0c\u5b9e\u73b0\u4e86\u7236\u7c7b\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u5b83\u4ece\u5177\u4f53\u7684\u540c\u4e8b\u5bf9\u8c61\u63a5\u53d7\u6d88\u606f\uff0c\u5411\u5177\u4f53\u540c\u4e8b\u5bf9\u8c61\u53d1\u51fa\u547d\u4ee4\u3002<br \/>\n\uff083\uff09<code>Colleague<\/code>\uff1a\u62bd\u8c61\u540c\u4e8b\u7c7b\u89d2\u8272\uff0c\u5b9a\u4e49\u4e86\u4e2d\u4ecb\u8005\u5bf9\u8c61\u7684\u63a5\u53e3\uff0c\u5b83\u53ea\u77e5\u9053\u4e2d\u4ecb\u8005\u800c\u4e0d\u77e5\u9053\u5176\u4ed6\u7684\u540c\u4e8b\u5bf9\u8c61\u3002<br \/>\n\uff084\uff09<code>ConcreteColleague1<\/code>\u3001<code>ConcreteColleague2<\/code>\uff1a\u5177\u4f53\u540c\u4e8b\u7c7b\u89d2\u8272\uff0c\u7ee7\u627f\u4e8e\u62bd\u8c61\u540c\u4e8b\u7c7b\uff0c\u6bcf\u4e2a\u5177\u4f53\u540c\u4e8b\u7c7b\u90fd\u77e5\u9053\u672c\u8eab\u5728\u5c0f\u8303\u56f4\u7684\u884c\u4e3a\uff0c\u800c\u4e0d\u77e5\u9053\u5728\u5927\u8303\u56f4\u5185\u7684\u76ee\u7684\u3002<\/p>\n<h2>\u7b80\u5355\u5b9e\u73b0<\/h2>\n<p>\u5728\u7535\u8111\u4e2d\uff0c\u4e3b\u673a\u90e8\u5206\u4e3b\u8981\u5206\u4e3a\uff1aCPU\u3001\u5185\u5b58\u3001\u663e\u5361\u3001IO\u8bbe\u5907\uff0c\u800c\u5c06\u5b83\u4eec\u6574\u5408\u8d77\u6765\u7684\u5c31\u662f\u4e3b\u677f\uff0c\u8fd9\u91cc\u4e3b\u677f\u5c31\u662f\u4e00\u4e2a\u4e2d\u4ecb\u8005\u3002\u4ee5\u6b64\u4e3a\u4f8b\u3002<\/p>\n<p>\u62bd\u8c61\u4e2d\u4ecb\u8005\uff1a<\/p>\n<pre><code class=\"language-java\">public abstract class Mediator {\n\n    \/**\n     * \u540c\u4e8b\u5bf9\u8c61\u6539\u53d8\u65f6\u901a\u77e5\u4e2d\u4ecb\u8005\u7684\u65b9\u6cd5\n     * \u5728\u540c\u4e8b\u5bf9\u8c61\u6539\u53d8\u65f6\u7531\u4e2d\u4ecb\u8005\u53bb\u901a\u77e5\u5176\u4ed6\u7684\u540c\u4e8b\u5bf9\u8c61\n     * \n     * @param c \u540c\u4e8b\u5bf9\u8c61\n     *\/\n    public abstract void changed(Colleague c);\n}<\/code><\/pre>\n<p>\u62bd\u8c61\u540c\u4e8b\uff1a<\/p>\n<pre><code class=\"language-java\">public abstract class Colleague {\n    protected Mediator mediator; \/\/\u6bcf\u4e00\u4e2a\u540c\u4e8b\u90fd\u8be5\u77e5\u9053\u5176\u4e2d\u4ecb\u8005\n\n    public Colleague(Mediator mediator) {\n        this.mediator = mediator;\n    }\n}<\/code><\/pre>\n<p>CPU\u540c\u4e8b\uff1a<\/p>\n<pre><code class=\"language-java\">public class CPU extends Colleague {\n\n    private String dataVideo, dataSound; \/\/\u89c6\u9891\u548c\u97f3\u9891\u6570\u636e\n\n    public CPU(Mediator mediator) {\n        super(mediator);\n    }\n\n    \/**\n     * \u83b7\u53d6\u89c6\u9891\u6570\u636e\n     * \n     * @return \u89c6\u9891\u6570\u636e\n     *\/\n    public String getDataVideo() {\n        return dataVideo;\n    }\n\n    \/**\n     * \u83b7\u53d6\u97f3\u9891\u6570\u636e\n     * \n     * @return \u97f3\u9891\u6570\u636e\n     *\/\n    public String getDataSound() {\n        return dataSound;\n    }\n\n    \/**\n     * \u89e3\u7801\u6570\u636e\n     * \n     * @param data\u97f3\u3001\u89c6\u9891\u6570\u636e\n     *\/\n    public void decodeData(String data){\n        \/\/\u5206\u5272\u97f3\u3001\u89c6\u9891\u6570\u636e\n        String[] tmp = data.split(&quot;,&quot;);\n\n        \/\/\u89e3\u6790\u97f3\u3001\u89c6\u9891\u6570\u636e\n        dataVideo = tmp[0];\n        dataSound = tmp[1];\n\n        \/\/\u544a\u8bc9\u4e2d\u4ecb\u8005\u81ea\u8eab\u72b6\u6001\u6539\u53d8\n        mediator.changed(this);\n    }\n}<\/code><\/pre>\n<p>\u5149\u9a71\u540c\u4e8b\uff1a<\/p>\n<pre><code class=\"language-java\">public class CDDevice extends Colleague {\n\n    private String data; \/\/\u89c6\u9891\u6570\u636e\n\n    public CDDevice(Mediator mediator) {\n        super(mediator);\n    }\n\n    \/**\n     * \u8bfb\u53d6\u89c6\u9891\u6570\u636e\n     * \n     * @return \u89c6\u9891\u6570\u636e\n     *\/\n    public String read(){\n        return data;\n    }\n\n    \/**\n     * \u52a0\u8f7d\u89c6\u9891\u6570\u636e\n     * \n     * @return \u97f3\u9891\u6570\u636e\n     *\/\n    public void load(){\n        data = &quot;\u89c6\u9891\u6570\u636e,\u97f3\u9891\u6570\u636e&quot;;\n        \/\/\u544a\u8bc9\u4e2d\u4ecb\u8005\u81ea\u8eab\u72b6\u6001\u6539\u53d8\n        mediator.changed(this);\n    }\n}<\/code><\/pre>\n<p>\u663e\u5361\u540c\u4e8b\uff1a<\/p>\n<pre><code class=\"language-java\">public class GraphicsCard extends Colleague {\n\n    public GraphicsCard(Mediator mediator) {\n        super(mediator);\n    }\n\n    \/**\n     * \u64ad\u653e\u89c6\u9891\u6570\u636e\n     * \n     * @param \u89c6\u9891\u6570\u636e\n     *\/\n    public void videoPlay(String data){\n        System.out.println(&quot;\u89c6\u9891\uff1a&quot; + data);\n    }\n}<\/code><\/pre>\n<p>\u58f0\u5361\u540c\u4e8b\uff1a<\/p>\n<pre><code class=\"language-java\">public class SoundCard extends Colleague{\n\n    public SoundCard(Mediator mediator) {\n        super(mediator);\n    }\n\n    \/**\n     * \u64ad\u653e\u97f3\u9891\u6570\u636e\n     * \n     * @param \u97f3\u9891\u6570\u636e\n     *\/\n    public void soundPlay(String data){\n        System.out.println(&quot;\u97f3\u9891\uff1a&quot; + data);\n    }\n}<\/code><\/pre>\n<p>\u4e3b\u677f\u4e2d\u4ecb\u8005\uff1a<\/p>\n<pre><code class=\"language-java\">public class MainBoard extends Mediator{\n\n    private CDDevice cdDevice; \/\/\u5149\u9a71\u8bbe\u5907\n    private CPU cpu; \/\/CPU\n    private SoundCard soundCard; \/\/\u58f0\u5361\u8bbe\u5907\n    private GraphicsCard graphicsCard; \/\/\u663e\u5361\u8bbe\u5907\n\n    @Override\n    public void changed(Colleague c) {\n        \/\/\u5982\u679c\u5149\u9a71\u8bfb\u53d6\u4e86\u6570\u636e\n        if (c == cdDevice) {\n            handleCD((CDDevice) c);\n        }\n        \/\/\u5982\u679cCPU\u5904\u7406\u5b8c\u6570\u636e\n        else if(c == cpu) {\n            handleCD((CPU) c);\n        }\n    }\n\n    \/**\n     * \u5904\u7406\u5149\u9a71\u8bfb\u53d6\u6570\u636e\u540e\u4e0e\u5176\u4ed6\u8bbe\u5907\u7684\u4ea4\u4e92\n     * \n     * @param cdDevice \u5149\u9a71\u8bbe\u5907\n     *\/\n    public void handleCD(CDDevice cdDevice){\n        cpu.decodeData(cdDevice.read());\n    }\n\n    \/**\n     * \u5904\u7406CPU\u8bfb\u53d6\u6570\u636e\u540e\u4e0e\u5176\u4ed6\u8bbe\u5907\u7684\u4ea4\u4e92\n     * \n     * @param cpu CPU\n     *\/\n    public void handleCD(CPU cpu){\n        soundCard.soundPlay(cpu.getDataSound());\n        graphicsCard.videoPlay(cpu.getDataVideo());\n    }\n\n    \/**\n     * \u8bbe\u7f6eCD\u8bbe\u5907\n     * \n     * @param CDDevice CD\u8bbe\u5907\n     *\/\n    public void setCDDevice(CDDevice cdDevice){\n        this.cdDevice = cdDevice;\n    }\n\n    \/**\n     * \u8bbe\u7f6eCPU\n     * \n     * @param cpu CPU\n     *\/\n    public void setCPU(CPU cpu){\n        this.cpu = cpu;\n    }\n\n    \/**\n     * \u8bbe\u7f6e\u58f0\u5361\u8bbe\u5907\n     * \n     * @param soundCard \u58f0\u5361\u8bbe\u5907\n     *\/\n    public void setSoundCard(SoundCard soundCard){\n        this.soundCard = soundCard;\n    }\n\n    \/**\n     * \u8bbe\u7f6e\u663e\u5361\u8bbe\u5907\n     * \n     * @param graphicsCard \u663e\u5361\u8bbe\u5907\n     *\/\n    public void setGraphicsCard(GraphicsCard graphicsCard){\n        this.graphicsCard = graphicsCard;\n    }\n}<\/code><\/pre>\n<p>\u64ad\u653e\u7535\u5f71\uff1a<\/p>\n<pre><code class=\"language-java\">public class Client {\n\n    public static void main(String[] args) {\n        \/\/\u6784\u9020\u4e3b\u677f\u5bf9\u8c61\n        MainBoard mediator = new MainBoard();\n\n        \/\/\u5206\u522b\u6784\u9020\u5404\u4e2a\u96f6\u4ef6\n        CDDevice cd = new CDDevice(mediator);\n        CPU cpu = new CPU(mediator);\n        GraphicsCard gc = new GraphicsCard(mediator);\n        SoundCard sc = new SoundCard(mediator);\n\n        \/\/\u5c06\u5404\u4e2a\u96f6\u4ef6\u5b89\u88c5\u5230\u4e3b\u677f\n        mediator.setCDDevice(cd);\n        mediator.setCPU(cpu);\n        mediator.setGraphicsCard(gc);\n        mediator.setSoundCard(sc);\n\n        \/\/\u64ad\u653e\u7535\u5f71\n        cd.load();\n    }\n\n}<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre><code>\u97f3\u9891\uff1a\u97f3\u9891\u6570\u636e\n\u89c6\u9891\uff1a\u89c6\u9891\u6570\u636e<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u51fa\u4e2d\u4ecb\u8005\u6a21\u5f0f\u5c06\u591a\u5bf9\u591a\u7684\u76f8\u4e92\u4f5c\u7528\u8f6c\u5316\u4e3a\u4e00\u5bf9\u591a\u7684\u76f8\u4e92\u4f5c\u7528\uff0c\u5c06\u7cfb\u7edf\u4ece\u7f51\u72b6\u7ed3\u6784\u53d8\u4e3a\u4ee5\u4e2d\u4ecb\u8005\u4e3a\u4e2d\u5fc3\u7684\u661f\u5f62\u7ed3\u6784\uff08\u8fd9\u91cc\u5c31\u662f\u4e3b\u677f\uff09\uff0c\u8fbe\u5230\u964d\u4f4e\u7cfb\u7edf\u7684\u590d\u6742\u6027\uff0c\u63d0\u9ad8\u53ef\u6269\u5c55\u6027\u3002<\/p>\n<h2>Android\u6e90\u7801\u4e2d\u7684\u4e2d\u4ecb\u8005\u6a21\u5f0f<\/h2>\n<ul>\n<li>Keyguard\u89e3\u9501\u5c4f<\/li>\n<\/ul>\n<p>\u8be6\u7ec6\u673a\u5236\u53c2\u8003\uff1aAndroid4.0 Keyguard\u89e3\u9501\u5c4f\u673a\u5236\uff08<a target=\"_blank\" rel=\"noopener\" href=\"http:\/\/blog.csdn.net\/ocean2006\/article\/details\/8079457\">http:\/\/blog.csdn.net\/ocean2006\/article\/details\/8079457<\/a>\uff09<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u5176\u5b9e\u5728Android\u5f00\u53d1\u4e2d\u6211\u4eec\u53ef\u80fd\u65e0\u610f\u95f4\u5c31\u4f7f\u7528\u4e86\u4e2d\u4ecb\u8005\u6a21\u5f0f\uff0c\u6bd4\u5982\u767b\u5f55\u6ce8\u518c\u754c\u9762\uff0c\u6211\u4eec\u4f7f\u7528EditText\u7684addTextChangedListener\u76d1\u542c\u8f93\u5165\u5bc6\u7801\u7684\u4f4d\u6570\u3001\u7528\u6237\u540d\u662f\u5426\u4e3a\u7a7a\uff0c\u5bc6\u7801\u4e0e\u786e\u8ba4\u5bc6\u7801\u662f\u5426\u4e00\u81f4\u7b49\u7b49\u5224\u65ad\u65f6\uff0c\u6b64\u65f6\u591a\u4e2a\u63a7\u4ef6\u4ea4\u4e92\uff0c\u5c31\u662f\u7531Activity\u5145\u5f53\u4e2d\u4ecb\u8005\u6765\u534f\u8c03\u3002<\/p>\n<ul>\n<li>\u4f18\u70b9<\/li>\n<\/ul>\n<p>\uff081\uff09\u9002\u5f53\u5730\u4f7f\u7528\u4e2d\u4ecb\u8005\u6a21\u5f0f\u53ef\u4ee5\u907f\u514d\u540c\u4e8b\u7c7b\u4e4b\u95f4\u7684\u8fc7\u5ea6\u8026\u5408\uff0c\u4f7f\u5f97\u5404\u540c\u4e8b\u7c7b\u4e4b\u95f4\u53ef\u4ee5\u76f8\u5bf9\u72ec\u7acb\u5730\u4f7f\u7528\u3002<br \/>\n\uff082\uff09\u4f7f\u7528\u4e2d\u4ecb\u8005\u6a21\u5f0f\u53ef\u4ee5\u5c06\u5bf9\u8c61\u7684\u884c\u4e3a\u548c\u534f\u4f5c\u8fdb\u884c\u62bd\u8c61\uff0c\u80fd\u591f\u6bd4\u8f83\u7075\u6d3b\u7684\u5904\u7406\u5bf9\u8c61\u95f4\u7684\u76f8\u4e92\u4f5c\u7528\u3002<br 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