源码有毒：Jfinal源码解析（二）

最新推荐文章于 2021-06-13 23:56:29 发布

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本文深入剖析Jfinal的源码，从Controller的add方法开始，探讨Map集合的存储机制。接着关注jfinalConfig.configPlugin()中对项目插件的配置，分析Plugins类如何封装List的add方法，并着重讲解IPlugin接口。同时，文章还介绍了插件的启动过程，通过startPlugins()方法逐一启动。最后提到了全局拦截器的配置方法jfinalConfig.configInterceptor()。

public Routes add(String controllerKey, Class<? extends Controller> controllerClass, String viewPath) {
        if (controllerKey == null)
            throw new IllegalArgumentException("The controllerKey can not be null");
        // if (controllerKey.indexOf(".") != -1)
            // throw new IllegalArgumentException("The controllerKey can not contain dot character: \".\"");
        controllerKey = controllerKey.trim();
        if ("".equals(controllerKey))
            throw new IllegalArgumentException("The controllerKey can not be blank");
        if (controllerClass == null)
            throw new IllegalArgumentException("The controllerClass can not be null");
        if (!controllerKey.startsWith("/"))
            controllerKey = "/" + controllerKey;
        if (map.containsKey(controllerKey))
            throw new IllegalArgumentException("The controllerKey already exists: " + controllerKey);

        map.put(controllerKey, controllerClass);

        if (viewPath == null || "".equals(viewPath.trim())) // view path is controllerKey by default
            viewPath = controllerKey;

        viewPath = viewPath.trim();
        if (!viewPath.startsWith("/"))                  // "/" added to prefix
            viewPath = "/" + viewPath;

        if (!viewPath.endsWith("/"))                    // "/" added to postfix
            viewPath = viewPath + "/";

        if (baseViewPath != null)                       // support baseViewPath
            viewPath = baseViewPath + viewPath;

        viewPathMap.put(controllerKey, viewPath);
        return this;
    }

add方法中，把相应的Controller（value），和与之对于的路径(key)存储都了一个Map集合中
继续看 jfinalConfig.configPlugin(plugins);这里是项目配置各种插件的地方，先看一个Demo

@Override
    public void configPlugin(Plugins pl) {
        DruidPlugin druidPlugin = new DruidPlugin(getProperty("jdbcUrl").trim(),
                getProperty("user").trim(), getProperty("password").trim(),
                getProperty("jdbcdriver").trim());
        druidPlugin.setFilters("stat,wall");
        pl.add(druidPlugin);
        pl.add(new EhCachePlugin());
        ActiveRecordPlugin arp = new ActiveRecordPlugin(druidPlugin);
        arp.setShowSql(true);
        // 设置数据库方言
        arp.setDialect(new AnsiSqlDialect());
        pl.add(arp);
        arp.addMapping("userinfo",UserInfo.class);
        arp.addMapping("mission",Mission.class);
    }

先看下Plugins类，这个类很短

final public class Plugins {

    private final List<IPlugin> pluginList = new ArrayList<IPlugin>();

    public Plugins add(IPlugin plugin) {
        if (plugin != null)
            this.pluginList.add(plugin);
        return this;
    }

    public List<IPlugin> getPluginList() {
        return pluginList;
    }
}

Plugins只做了一个功能，把List集合的add方法进行了二次封装，重点看下IPlugin接口

public interface IPlugin {
    boolean start();
    boolean stop();
}

在jfinalConfig.configPlugin(plugins);方法之后，调用了静态方法
startPlugins();

private static void startPlugins() {
        List<IPlugin> pluginList = plugins.getPluginList();
        if (pluginList == null)
            return ;

        for (IPlugin plugin : pluginList) {
            try {
                // process ActiveRecordPlugin devMode
                if (plugin instanceof com.jfinal.plugin.activerecord.ActiveRecordPlugin) {
                    com.jfinal.plugin.activerecord.ActiveRecordPlugin arp = (com.jfinal.plugin.activerecord.ActiveRecordPlugin)plugin;
                    if (arp.getDevMode() == null)
                        arp.setDevMode(constants.getDevMode());
                }

                if (plugin.start() == false) {
                    String message = "Plugin start error: " + plugin.getClass().getName();
                    log.error(message);
                    throw new RuntimeException(message);
                }
            }
            catch (Exception e) {
                String message = "Plugin start error: " + plugin.getClass().getName() + ". \n" + e.getMessage();
                log.error(message, e);
                throw new RuntimeException(message, e);
            }
        }
    }