ApplicationInitializer

如果想在web应用启动时做一些初始化的工作,就象在Servlet的init方法中的一样,同时又想把初始化的数据存储于Global中供访问.就需要配置一个ApplicationInitializer.步骤如下:
1.新建一个类实现org.apache.tapestry.services.ApplicationInitializer接口.

public final class ApplicationInitializer implements
        org.apache.tapestry.services.ApplicationInitializer {
    public static final Log LOG = LogFactory
            .getLog(ApplicationInitializer.class);

    private Infrastructure infrastructure;

    public Infrastructure getInfrastructure() {
        return infrastructure;
    }

    public void setInfrastructure(Infrastructure infrastructure) {
        this.infrastructure = infrastructure;
    }

    public void initialize(HttpServlet servlet) {
        Global global = (Global) infrastructure.getApplicationStateManager()
                .get("global");
       //其他初始化代码,可将数据写入global中
    }

2.修改hivemind.xml
<service-point id="ApplicationInitializer"
        interface="org.apache.tapestry.services.ApplicationInitializer"
        visibility="private">
        <invoke-factory>
            <construct class="com.fitechlabs.xweb.core.ApplicationInitializer">
                <set-service property="infrastructure" service-id="tapestry.Infrastructure"/>
            </construct>
        </invoke-factory>
    </service-point> 
    <contribution configuration-id="tapestry.init.ApplicationInitializers">
        <command id="xweb-init" object="service:ApplicationInitializer" after="*"/>
    </contribution>
其中,after="*"是必须的,可以确保tapestry完成所有的初始化任务,以便可以访问Global对象.