{"id":1127,"date":"2023-03-16T21:26:50","date_gmt":"2023-03-16T13:26:50","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1127"},"modified":"2023-04-29T10:01:55","modified_gmt":"2023-04-29T02:01:55","slug":"design-pattern-proxy-pattern","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/16\/design-pattern-proxy-pattern\/","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\uff0818\uff09\u4ee3\u7406\u6a21\u5f0f"},"content":{"rendered":"

\u4ee3\u7406\u6a21\u5f0f\u4e5f\u79f0\u59d4\u6258\u6a21\u5f0f\uff0c\u662f\u7ed3\u6784\u578b\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002\u662f\u5e94\u7528\u5e7f\u6cdb\u7684\u6a21\u5f0f\u4e4b\u4e00\u3002<\/p>\n

\u5b9a\u4e49<\/h2>\n

<\/p>\n

\u4e3a\u5176\u4ed6\u5bf9\u8c61\u63d0\u4f9b\u4e00\u79cd\u4ee3\u7406\u4ee5\u63a7\u5236\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u7684\u8bbf\u95ee\u3002<\/p>\n

\u4f7f\u7528\u573a\u666f<\/h2>\n

\u5f53\u65e0\u6cd5\u6216\u4e0d\u60f3\u76f4\u63a5\u8bbf\u95ee\u67d0\u4e2a\u5bf9\u8c61\u6216\u8bbf\u95ee\u67d0\u4e2a\u5bf9\u8c61\u5b58\u5728\u56f0\u96be\u65f6\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u6765\u95f4\u63a5\u8bbf\u95ee\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u5ba2\u6237\u7aef\u4f7f\u7528\u7684\u900f\u660e\u6027\uff0c\u59d4\u6258\u5bf9\u8c61\u4e0e\u4ee3\u7406\u5bf9\u8c61\u9700\u8981\u5b9e\u73b0\u76f8\u540c\u7684\u63a5\u53e3\u3002<\/p>\n

UML\u7c7b\u56fe<\/h2>\n

\u8fd9\u91cc\u5199\u56fe\u7247\u63cf\u8ff0<\/p>\n

\uff081\uff09Subject<\/code>\uff1a\u62bd\u8c61\u4e3b\u9898\u7c7b\uff0c\u58f0\u660e\u771f\u5b9e\u4e3b\u9898\u4e0e\u5171\u540c\u63a5\u53e3\u65b9\u6cd5\uff0c\u8be5\u7c7b\u53ef\u4ee5\u662f\u62bd\u8c61\u7c7b\u6216\u63a5\u53e3\u3002
\n\uff082\uff09RealSubject<\/code>\uff1a\u771f\u5b9e\u4e3b\u9898\u7c7b\uff08\u88ab\u59d4\u6258\u7c7b\uff09\uff0c\u5c24\u5176\u6267\u884c\u5177\u4f53\u7684\u4e1a\u52a1\u903b\u8f91\u65b9\u6cd5\u3002
\n\uff083\uff09Proxy<\/code>\uff1a\u4ee3\u7406\u7c7b\uff08\u59d4\u6258\u7c7b\uff09\uff0c\u8be5\u7c7b\u6301\u6709\u4e00\u4e2a\u5bf9\u771f\u5b9e\u4e3b\u9898\u7c7b\u7684\u5f15\u7528\uff0c\u5728\u5176\u6240\u5b9e\u73b0\u7684\u63a5\u53e3\u65b9\u6cd5\u4e2d\u8c03\u7528\u771f\u5b9e\u4e3b\u9898\u7c7b\u4e2d\u76f8\u5e94\u7684\u63a5\u53e3\u65b9\u6cd5\u6267\u884c\uff0c\u4ee5\u6b64\u8d77\u5230\u4ee3\u7406\u4f5c\u7528\u3002<\/p>\n

\u7b80\u5355\u5b9e\u73b0<\/h2>\n

\u4e66\u4e2d\u4f8b\u5b50\uff1a\u4ee5\u5c0f\u6c11\u8bc9\u8bbc\u7684\u6d41\u7a0b\u4e3e\u4f8b\u3002\u90a3\u4e48\u9700\u8981\u4ee3\u7406\u5f8b\u5e08\u4ee3\u7406\uff0c\u8bc9\u8bbc\u7b80\u5355\u6d41\u7a0b\uff1a\u63d0\u4ea4\u7533\u8bf7\u2013>\u8fdb\u884c\u4e3e\u8bc1\u2013>\u5f00\u59cb\u8fa9\u62a4\u2013>\u8bc9\u8bbc\u5b8c\u6210\u3002<\/p>\n

\u8bc9\u8bbc\u63a5\u53e3\u7c7b\uff1a<\/p>\n

public interface ILawsuit {\n\n    \/**\n     * \u63d0\u4ea4\u7533\u8bf7 \n     *\/\n    void submit();\n\n    \/**\n     * \u8fdb\u884c\u4e3e\u8bc1 \n     *\/\n    void burden();\n\n    \/**\n     * \u5f00\u59cb\u8fa9\u62a4\n     *\/\n    void defend();\n\n    \/**\n     * \u8bc9\u8bbc\u5b8c\u6210\n     *\/\n    void finish();\n}<\/code><\/pre>\n
\u5177\u4f53\u8bc9\u8bbc\u4eba\u5c0f\u6c11\uff1a<\/p>\n
public class XiaoMin implements ILawsuit{\n\n    @Override\n    public void submit() {\n        \/\/\u5c0f\u6c11\u7533\u8bf7\u4ef2\u88c1\n        System.out.println("\u8001\u677f\u5e74\u5e95\u62d6\u6b20\u5de5\u8d44\uff0c\u7279\u6b64\u7533\u8bf7\u4ef2\u88c1\uff01");\n    }\n\n    @Override\n    public void burden() {\n        \/\/\u5c0f\u6c11\u63d0\u4ea4\u8bc1\u636e\n        System.out.println("\u8fd9\u662f\u5408\u540c\u4e66\u548c\u8fc7\u53bb\u4e00\u5e74\u7684\u94f6\u884c\u5de5\u8d44\u6d41\u6c34\uff01");\n    }\n\n    @Override\n    public void defend() {\n        \/\/\u94c1\u8bc1\u5982\u5c71\n        System.out.println("\u8bc1\u636e\u786e\u51ff\uff0c\u4e0d\u9700\u8981\u518d\u8bf4\u4ec0\u4e48\uff01");\n    }\n\n    @Override\n    public void finish() {\n        \/\/\u7ed3\u679c\n        System.out.println("\u8bc9\u8bbc\u6210\u529f\uff0c\u5224\u51b3\u8001\u677f\u5373\u65e5\u8d77\u4e03\u5929\u5185\u7ed3\u7b97\u5de5\u8d44\uff01");\n    }\n\n}<\/code><\/pre>\n
\u4ee3\u7406\u5f8b\u5e08\uff1a<\/p>\n
public class Lawyer implements ILawsuit{\n\n    private ILawsuit mLawsuit; \/\/\u6301\u6709\u4e00\u4e2a\u5177\u4f53\u88ab\u4ee3\u7406\u8005\u7684\u5f15\u7528\n\n    public Lawyer(ILawsuit lawsuit) {\n        this.mLawsuit = lawsuit;\n    }\n\n    @Override\n    public void submit() {\n        mLawsuit.submit();\n    }\n\n    @Override\n    public void burden() {\n        mLawsuit.burden();\n    }\n\n    @Override\n    public void defend() {\n        mLawsuit.defend();\n    }\n\n    @Override\n    public void finish() {\n        mLawsuit.finish();\n    }\n}<\/code><\/pre>\n
\u5f00\u59cb\u4ef2\u88c1\uff1a<\/p>\n
public class Client {\n    public static void main(String[] args) {\n        \/\/\u6784\u9020\u51fa\u8bc9\u8bbc\u4eba\u5c0f\u6c11\n        ILawsuit xiaomin = new XiaoMin();\n\n        \/\/\u6784\u9020\u4e00\u4e2a\u4ee3\u7406\u5f8b\u5e08\uff0c\u5e76\u5c06\u5c0f\u6c11\u4f20\u9012\u8fdb\u53bb\n        ILawsuit lawyer = new Lawyer(xiaomin);\n\n        \/\/\u5f8b\u5e08\u63d0\u4ea4\u7533\u8bf7\n        lawyer.submit();\n\n        \/\/\u5f8b\u5e08\u8fdb\u884c\u4e3e\u8bc1\n        lawyer.burden();\n\n        \/\/\u5f8b\u5e08\u4ee3\u5c0f\u6c11\u8fa9\u62a4\n        lawyer.defend();\n\n        \/\/\u5b8c\u6210\u8bc9\u8bbc\n        lawyer.finish();\n    }\n}<\/code><\/pre>\n
\u7ed3\u679c\uff1a<\/p>\n
\u8001\u677f\u5e74\u5e95\u62d6\u6b20\u5de5\u8d44\uff0c\u7279\u6b64\u7533\u8bf7\u4ef2\u88c1\uff01\n\u8fd9\u662f\u5408\u540c\u4e66\u548c\u8fc7\u53bb\u4e00\u5e74\u7684\u94f6\u884c\u5de5\u8d44\u6d41\u6c34\uff01\n\u8bc1\u636e\u786e\u51ff\uff0c\u4e0d\u9700\u8981\u518d\u8bf4\u4ec0\u4e48\uff01\n\u8bc9\u8bbc\u6210\u529f\uff0c\u5224\u51b3\u8001\u677f\u5373\u65e5\u8d77\u4e03\u5929\u5185\u7ed3\u7b97\u5de5\u8d44\uff01<\/code><\/pre>\n
\u540c\u6837\u6211\u4eec\u4e5f\u53ef\u4ee5\u4ee3\u7406\u5176\u4ed6\u4eba\uff0c\u53ea\u9700\u8981\u5b9e\u73b0ILawsuit\u5373\u53ef\u3002\u4e0a\u9762\u7684\u4ee3\u7406\u6a21\u5f0f\u4e5f\u53eb\u9759\u6001\u4ee3\u7406\uff0c\u4e5f\u5c31\u662f\u5728\u4ee3\u7801\u8fd0\u884c\u524d\u4ee3\u7406\u7c7b\u7684class\u6587\u4ef6\u5c31\u5df2\u7ecf\u5b58\u5728\u3002\u90a3\u4e48\u76f8\u53cd\uff0c\u5f53\u7136\u4e5f\u4f1a\u6709\u52a8\u6001\u4ee3\u7406\uff0c\u4e0b\u9762\u7528\u52a8\u6001\u4ee3\u7406\u5b9e\u73b0\u4e0a\u8ff0\u4f8b\u5b50\uff1a<\/p>\n
Java\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4fbf\u6377\u7684\u52a8\u6001\u4ee3\u7406\u63a5\u53e3InvocationHandler<\/code>\uff0c\u6211\u4eec\u6765\u5b9e\u73b0\u5b83\uff1a<\/p>\n
public class DynamicPorxy implements InvocationHandler{\n\n    private Object obj; \/\/\u88ab\u4ee3\u7406\u7c7b\u7684\u5f15\u7528\n\n    public DynamicPorxy(Object obj) {\n        this.obj = obj;\n    }\n\n    @Override\n    public Object invoke(Object proxy, Method method, Object[] args)\n            throws Throwable {\n        \/\/ \u8c03\u7528\u88ab\u4ee3\u7406\u7c7b\u5bf9\u8c61\u7684\u65b9\u6cd5\n        Object result = method.invoke(obj, args);\n        return result;\n    }\n\n}<\/code><\/pre>\n
\u8fd9\u91cc\u6211\u4eec\u901a\u8fc7invoke\u65b9\u6cd5\u6765\u8c03\u7528\u5177\u4f53\u7684\u88ab\u4ee3\u7406\u65b9\u6cd5\u3002<\/p>\n
\u4fee\u6539\u540e\u7684Client\u7c7b\uff1a<\/p>\n
public class Client {\n    public static void main(String[] args) {\n        \/\/\u6784\u9020\u51fa\u8bc9\u8bbc\u4eba\u5c0f\u6c11\n        ILawsuit xiaomin = new XiaoMin();\n\n        \/\/1.\u9759\u6001\u4ee3\u7406\n        \/\/\u6784\u9020\u4e00\u4e2a\u4ee3\u7406\u5f8b\u5e08\uff0c\u5e76\u5c06\u5c0f\u6c11\u4f20\u9012\u8fdb\u53bb\n        \/\/ILawsuit lawyer = new Lawyer(xiaomin);\n\n        \/\/--------------------------------------\n        \/\/2.\u52a8\u6001\u4ee3\u7406\n        \/\/\u6784\u9020\u4e00\u4e2a\u52a8\u6001\u4ee3\u7406\n        DynamicPorxy proxy = new DynamicPorxy(xiaomin);\n\n        \/\/\u83b7\u53d6\u88ab\u4ee3\u7406\u7c7b\u5c0f\u6c11\u7684ClassLoader\n        ClassLoader loader = xiaomin.getClass().getClassLoader();\n\n        \/\/\u52a8\u6001\u6784\u9020\u4e00\u4e2a\u4ee3\u7406\u8005\u5f8b\u5e08\n        ILawsuit lawyer = (ILawsuit) Proxy.newProxyInstance(loader, new Class[]{ ILawsuit.class }, proxy);\n\n        \/\/\u5f8b\u5e08\u63d0\u4ea4\u7533\u8bf7\n        lawyer.submit();\n\n        \/\/\u5f8b\u5e08\u8fdb\u884c\u4e3e\u8bc1\n        lawyer.burden();\n\n        \/\/\u5f8b\u5e08\u4ee3\u5c0f\u6c11\u8fa9\u62a4\n        lawyer.defend();\n\n        \/\/\u5b8c\u6210\u8bc9\u8bbc\n        lawyer.finish();\n    }\n}<\/code><\/pre>\n
\u7ed3\u679c\u4e0d\u53d8\uff0c\u7531\u6b64\u53ef\u4ee5\u770b\u51fa\u52a8\u6001\u4ee3\u7406\u901a\u8fc7\u4e00\u4e2a\u4ee3\u7406\u7c7b\u6765\u5904\u7406N\u591a\u4e2a\u88ab\u4ee3\u7406\u7c7b\uff0c\u5176\u5b9e\u8d28\u662f\u5bf9\u4ee3\u7406\u8005\u4e0e\u88ab\u4ee3\u7406\u8005\u89e3\u8026\u3002\u76f8\u5bf9\u800c\u8a00\u9759\u6001\u4ee3\u7406\u5219\u53ea\u80fd\u4e3a\u7ed9\u5b9a\u63a5\u53e3\u4e0b\u7684\u5b9e\u73b0\u7c7b\u505a\u4ee3\u7406\uff0c\u5982\u679c\u63a5\u53e3\u4e0d\u540c\u90a3\u4e48\u5c31\u9700\u8981\u91cd\u65b0\u5b9a\u4e49\u4e0d\u540c\u7684\u4ee3\u7406\u7c7b\uff0c\u8f83\u4e3a\u590d\u6742\uff0c\u4f46\u662f\u9759\u6001\u4ee3\u7406\u66f4\u7b26\u5408\u9762\u5411\u5bf9\u8c61\u539f\u5219\u3002\u5177\u4f53\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\uff0c\u6839\u636e\u4e2a\u4eba\u559c\u597d\u3002<\/p>\n
Android\u6e90\u7801\u4e2d\u7684\u4ee3\u7406\u6a21\u5f0f\u5b9e\u73b0<\/h2>\n
    \n
  • ActivityManagerProxy\u4ee3\u7406\u7c7b<\/li>\n<\/ul>\n
    ActivityManager<\/code>\u662fAndroid\u4e2d\u7ba1\u7406\u548c\u7ef4\u62a4Activity<\/code>\u7684\u76f8\u5173\u4fe1\u606f\u7684\u7c7b\uff0c\u4e3a\u4e86\u9694\u79bb\u5b83\u4e0eActivityManagerService<\/code>\uff0c\u6709\u6548\u964d\u4f4e\u4e8c\u8005\u7684\u8026\u5408\uff0c\u5728\u8fd9\u4e2d\u95f4\u4f7f\u7528\u4e86ActivityManagerProxy<\/code>\u4ee3\u7406\u7c7b\uff0c\u6240\u6709\u5bf9ActivityManagerService<\/code>\u7684\u8bbf\u95ee\u90fd\u8f6c\u6362\u6210\u5bf9\u4ee3\u7406\u7c7b\u7684\u8bbf\u95ee\uff0c\u8fd9\u6837ActivityManager<\/code>\u5c31\u4e0eActivityManagerService<\/code>\u89e3\u8026\u4e86\u3002<\/p>\n
    \u603b\u7ed3<\/h2>\n
      \n
    • \u4f18\u70b9<\/li>\n<\/ul>\n
      \uff081\uff09\u5bf9\u4ee3\u7406\u8005\u4e0e\u88ab\u4ee3\u7406\u8005\u8fdb\u884c\u89e3\u8026
      \n\uff082\uff09\u4ee3\u7406\u5bf9\u8c61\u5728\u5ba2\u6237\u7aef\u548c\u76ee\u6807\u5bf9\u8c61\u4e4b\u95f4\u8d77\u5230\u4e00\u4e2a\u4e2d\u4ecb\u7684\u4f5c\u7528\uff0c\u8fd9\u6837\u53ef\u4ee5\u8d77\u5230\u5bf9\u76ee\u6807\u5bf9\u8c61\u7684\u4fdd\u62a4<\/p>\n
        \n
      • \u7f3a\u70b9<\/li>\n<\/ul>\n
        \u57fa\u672c\u6ca1\u6709\u7f3a\u70b9\uff0c\u771f\u8981\u8bf4\u7f3a\u70b9\u5c31\u662f\u8bbe\u8ba1\u6a21\u5f0f\u7684\u901a\u75c5\uff1a\u5bf9\u7c7b\u7684\u589e\u52a0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u4ee3\u7406\u6a21\u5f0f\u4e5f\u79f0\u59d4\u6258\u6a21\u5f0f\uff0c\u662f\u7ed3\u6784\u578b\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002\u662f\u5e94\u7528\u5e7f\u6cdb\u7684\u6a21\u5f0f\u4e4b\u4e00\u3002 \u5b9a\u4e49 \u4e3a\u5176\u4ed6\u5bf9\u8c61\u63d0\u4f9b\u4e00\u79cd\u4ee3\u7406\u4ee5\u63a7\u5236\u5bf9\u8fd9\u4e2a\u5bf9 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[303],"tags":[],"class_list":["post-1127","post","type-post","status-publish","format-standard","hentry","category-design-pattern"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1127"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1127\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}