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Jakarta Struts Cookbook
book

Jakarta Struts Cookbook

by Bill Siggelkow
February 2005
Intermediate to advanced content levelIntermediate to advanced
528 pages
12h 53m
English
O'Reilly Media, Inc.
Content preview from Jakarta Struts Cookbook

10.8. Refreshing Application Data

Problem

You want the ability to refresh application-scoped objects cached in the servlet context.

Solution

Provide an interface, such as the one shown in Example 10-24, which indicates if an object can be refreshed.

Example 10-24. Interface used to refresh cached objects

package com.oreilly.strutsckbk.ch10;

/**
 * An object that can be refreshed from its original source.
 */
public interface Refreshable {

    public void refresh( ) throws CacheException;
    
}

Create an Action, such as the one shown in Example 10-25, which refreshes objects in the servlet context. Alternatively, you could create a base Action that provides a protected method for refreshing a named object. This may be necessary to avoid chaining to the ContextRefreshAction whenever you need to refresh data.

Example 10-25. Context refresh action

package com.oreilly.strutsckbk.ch10; import java.util.Enumeration; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; public class ContextRefreshAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { String name = request.getParameter("name"); ServletContext ctx = servlet.getServletContext( ); ...
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Publisher Resources

ISBN: 059600771XSupplemental ContentErrata Page