XSL中的睡眠功能

Question

I think there is no direct way to do this in XSL but wanted to check with you all before writing a server-side code.

I'm working on a website to display tweets from hundreds of different accounts using twitter API. There is a large XML file containing 200+ twitter ID's and count (1-12). I have a PHP script that does OAuth and outputs JSON using the twitter API. This PHP file takes both id and count as query strings. Now twitter does have a limit to the number of requests that can be sent per 15 minutes. Since the web page is generated using XSL transformation via Saxon, I was thinking to do something like-

  <xsl:template name="all-social">

    <xsl:for-each select="/social/twitter">
      <xsl:value-of select="unparsed-text(concat('http://something/twitter.php?
    id=',@id,'&amp;count=',@count))"/> 
       <!-- or apply-templates select="document(--URL--)" -->
    </xsl:for-each> 

  </xsl:template>

This will return the JSON of tweets and I can do everything on the front-end to display it properly. But to overcome the API limit I need to add a pause or sleep inside the for-each loop like-

      <xsl:template name="all-social">

        <xsl:for-each select="/social/twitter">

           <!-- Wait for 5 seconds -->

          <xsl:value-of select="unparsed-text(concat('http://something/twitter.php?
        id=',@id,'&amp;count=',@count))"/>
        </xsl:for-each> 

      </xsl:template>

Again, I understand this is very easy to do by just using the server-side scripting, by I'm curious if there is a way to add a sleep() during XSL transformation. Any ideas/recommendation will be highly appreciated.

Answer 1

I can think of two ways to do this: one is to execute the transformation periodically on the server (i.e. sleep between transformations), the other is to generate HTML code containing Javascript (or Saxon-CE) code that periodically fetches the twitter feed. We demonstrated how to do the latter in a paper at XML Prague 2013.