webcachemanager.java.svn-base

EasyJWeb是基于java技术

package com.easyjf.web.core;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.List;

import com.easyjf.container.annonation.WebCache;
import com.easyjf.util.CommUtil;
import com.easyjf.web.ActionContext;
import com.easyjf.web.Globals;
import com.easyjf.web.IRequestCallback;
import com.easyjf.web.Module;
import com.easyjf.web.Page;
import com.easyjf.web.WebForm;
import com.easyjf.web.WebInvocationParam;
/**
 * 用于管理页面缓存信息，包括url地址对应信息等。
 * @author 大峡
 *
 */
public class WebCacheManager {
private final static WebCacheManager singleton=new WebCacheManager();
public static WebCacheManager getInstance()
{
	return singleton;
}
public final List urls=new java.util.ArrayList();
public Page handleCache(WebInvocationParam webParam,WebCache cache)
{
	Page ret=null;	
	String cacheUrl=getUrl(webParam,cache);
	File f=new File(Globals.APP_BASE_DIR+cacheUrl);
	//System.out.println("执行cache:"+f.getAbsolutePath());	
	Object refreshWebCache=webParam.getForm().get("refreshWebCache");
	if(!urls.contains(cacheUrl)){
	if(f.exists() && (refreshWebCache==null) &&  (System.currentTimeMillis()-f.lastModified()<1000*cache.timeout()))
	{	
		//System.out.println("从cache返回数据");
		ret=new Page("cache",cacheUrl,"forward");
	}	
	else 
	{
		try{
		if(!f.getParentFile().exists())f.getParentFile().mkdirs();
		java.io.Writer writer = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");				
		ActionContext.getContext().setCustomWriter(writer);
		ActionContext.getContext().setUri(cacheUrl);
		urls.add(cacheUrl);
		//System.out.println("准备生成缓丰:"+urls.size());
		ActionContext.getContext().setRequestCallback(new CacheFinishCallback(cacheUrl));
		//Thread.sleep(5000l);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		//ret=new Page("action",cache)
	}}
	return ret;
}
public String getUrl(WebInvocationParam webParam,WebCache cache)
{
	Module module=webParam.getModule();
	WebForm form=webParam.getForm();
	String command = CommUtil.null2String(form.get("easyJWebCommand"));	
	if ("".equals(command))
		command = CommUtil.null2String(form.get("cmd"));
	if("".equals(command))command="index";
	String[] params=cache.params();
	String fileName=command;
	for(int i=0;i<params.length;i++)
	{
		if(!"CMD".equals(params[i]))
		{
			String v=CommUtil.null2String(form.get(params[i]));
			fileName+="-"+params[i]+"-"+v;
		}
	}
	String cacheUrl="/html/cache/"+module.getPath()+"/"+fileName+".html";
	return cacheUrl;
}
public class CacheFinishCallback implements IRequestCallback
{
	private String url;
	CacheFinishCallback(String url)
	{
		this.url=url;
	}
	public void doFinish() {
	if(url!=null)urls.remove(url);
	System.out.println("生成缓存完成："+urls.size());
	}	
}
}