WebAdapterServlet 运行机制(2)

LinkedList applications =

(LinkedList) session.getAttribute(SESSION_ATTR_APPS);

if (applications == null)

return null;

// Search for the application (using the application URI) from the list

Application application = null;

for (Iterator i = applications.iterator();

i.hasNext() && application == null;

) {

Application a = (Application) i.next();

String aPath = a.getURL().getPath();

String servletPath =

request.getContextPath() + request.getServletPath();

if (servletPath.length() < aPath.length())

servletPath += "/";

if (servletPath.equals(aPath))

application = a;

}

// Remove stopped applications from the list

if (application != null && !application.isRunning()) {

applications.remove(application);

application = null;

}

根据request 得到适当的application,如果为第一次请求则建立一个application

application = createApplication(request);

详细过程如下:

URL applicationUrl = getApplicationUrl(request);

创建session 中的applications.

// Get application list.

HttpSession session = request.getSession();

if (session == null)

return null;

LinkedList applications =

(LinkedList) session.getAttribute(SESSION_ATTR_APPS);

if (applications == null) {

applications = new LinkedList();

session.setAttribute(SESSION_ATTR_APPS, applications);

HttpSessionBindingListener sessionBindingListener =

new SessionBindingListener(applications);

session.setAttribute(

SESSION_BINDING_LISTENER,

sessionBindingListener);

}

初始化并启动

application = (Application) this.applicationClass.newInstance();

applications.add(application);

application.addListener((Application.WindowAttachListener) this);

application.addListener((Application.WindowDetachListener) this);

application.setLocale(request.getLocale());

application.start(

applicationUrl,

this.applicationProperties,

new WebApplicationContext(session));

启动过程非常简单,设置变量,并调用application.init()

public void start(URL applicationUrl, Properties applicationProperties, ApplicationContext context) {

this.applicationUrl = applicationUrl;

this.properties = applicationProperties;

this.context = context;

init();

applicationIsRunning = true;

}

posted on 2005-08-05 18:43 staunch 阅读(175) 评论(0) 编辑收藏

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