WebAdapterServlet 的运行机制(1)

WebAdapterServlet 类将普通基于Servlet的开发变为了基于事件的开发，所以理清它的运行机制对于理解Millstone的运作情况非常重要。
类中的域:

private Class applicationClass;

private Properties applicationProperties;

private UIDLTransformerFactory transformerFactory;

private CollectionThemeSource themeSource;

private String resourcePath = null;

//private boolean enableBrowserProbe = false;

private boolean debugMode = false;

private int maxConcurrentTransformers;

private long transformerCacheTime;

private long themeCacheTime;

private WeakHashMap applicationToDirtyWindowSetMap = new WeakHashMap();

private WeakHashMap applicationToServerCommandStreamLock =

new WeakHashMap();

private WeakHashMap applicationToLastRequestDate = new WeakHashMap();

private List allWindows = new LinkedList();

1. init()

String applicationClassName =

servletConfig.getInitParameter("application");

从web.xml中得到运行的application 的类名

this.applicationProperties = new Properties();

for (Enumeration e = servletConfig.getInitParameterNames();

e.hasMoreElements();

) {

String name = (String) e.nextElement();

this.applicationProperties.setProperty(

name,

servletConfig.getInitParameter(name));

}

将所有的web中的参数转移到applicationProperties中,以便使用.

ServletContext context = servletConfig.getServletContext();

for (Enumeration e = context.getInitParameterNames();

e.hasMoreElements();

) {

String name = (String) e.nextElement();

this.applicationProperties.setProperty(

name,

context.getInitParameter(name));

}

得到servelt的initparameter覆盖web.xml中的参数.

// Get the debug window parameter

String debug = getApplicationOrSystemProperty(PARAMETER_DEBUG, "false");

// Enable application specific debug

this.debugMode = debug.equals("true");

从application中或system 确定是否为debug 状态

// Add all specified theme sources

this.themeSource = new CollectionThemeSource();

List directorySources = getThemeSources();

for (Iterator i = directorySources.iterator(); i.hasNext();) {

this.themeSource.add((ThemeSource) i.next());

}

增加指定的主题

// Add the default theme source

String defaultThemeJar =

getApplicationOrSystemProperty(

PARAMETER_DEFAULT_THEME_JAR,

DEFAULT_THEME_JAR);

File f = findDefaultThemeJar(defaultThemeJar);

try {

// Add themes.jar if exists

if (f != null && f.exists())

this.themeSource.add(new JarThemeSource(f, this, ""));

else {

Log.warn("Default theme JAR not found: " + defaultThemeJar);

}

} catch (Exception e) {

throw new ServletException(

"Failed to load default theme from " + defaultThemeJar,

e);

}

增加默任的主题

ClassLoader loader = this.getClass().getClassLoader();

try {

this.applicationClass = loader.loadClass(applicationClassName);

} catch (ClassNotFoundException e) {

throw new ServletException(

"Failed to load application class: " + applicationClassName);

}

最后是装载application的类.

posted on 2005-08-05 17:00 staunch 阅读(134) 评论(0) 编辑收藏

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