捌度空间 缓存类

捌度空间 缓存类代码

<%
class cache
    private obj            'cache内容
    private expiretime        '过期时间
    private expiretimename    '过期时间application名
    private cachename        'cache内容application名
    private path            'url

    private sub class_initialize()
        path=request.servervariables("url")
        path=left(path,instrrev(path,"/"))
    end sub

    private sub class_terminate()
    end sub

    public property get blempty
        '是否为空
        if isempty(obj) then
            blempty=true
        else
            blempty=false
        end if
    end property

    public property get valid
        '是否可用(过期)
        if isempty(obj) or not isdate(expiretime) then
            valid=false
        elseif cdate(expiretime)<now then
                valid=false
        else
            valid=true
        end if
    end property

    public property let name(str)
        '设置cache名
        cachename=str & path
        obj=application(cachename)
        expiretimename=str & "expires" & path
        expiretime=application(expiretimename)
    end property

    public property let expires(tm)
        '重设置过期时间
        expiretime=tm
        application.lock
        application(expiretimename)=expiretime
        application.unlock
    end property

    public sub add(var,expire)
        '赋值
        if isempty(var) or not isdate(expire) then
            exit sub
        end if
        obj=var
        expiretime=expire
        application.lock
        application(cachename)=obj
        application(expiretimename)=expiretime
        application.unlock
    end sub

    public property get value
        '取值
        if isempty(obj) or not isdate(expiretime) then
            value=null
        elseif cdate(expiretime)<now then
            value=null
        else
            value=obj
        end if
    end property

    public sub makeempty()
        '释放application
        application.lock
        application(cachename)=empty
        application(expiretimename)=empty
        application.unlock
        obj=empty
        expiretime=empty
    end sub

    public function equal(var2)
        '比较
        if typename(obj)<>typename(var2) then
            equal=false
        elseif typename(obj)="object" then
            if obj is var2 then
                equal=true
            else
                equal=false
            end if
        elseif typename(obj)="variant()" then
            if join(obj,"^")=join(var2,"^") then
                equal=true
            else
                equal=false
            end if
        else
            if obj=var2 then
                equal=true
            else
                equal=false
            end if
        end if
    end function
end class
%>

使用方法：

    set mycache=new cache
    mycache.name="flash1"
    if mycache.valid then
        startget = mycache.value
    else
        startget = gethttppage(httpurl)    
        mycache.add startget,dateadd("h",3,now)
    end if 
    list=getbody(startget,"</form>","<!-- ********网页中部代码结束******** -->",false,false)