ServletSpeedster Web, generated: 2004-04-19 18:55 [EEST]  

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  • How much memory does the cache take ?
    - Basically it's the cache size in pages multiplied by the subpage size you need to cache.
    Caching 15 subpages with a size around 1 kilobyte in a cache takes 15 about kilobytes.
  • Why is the cache held in memory and not on the disk ?
    - I'm trying to create the cache as lightweight and quick as possible
    Reading/writing in ram is much faster than on the disk.
    Also the servers nowadays have so much RAM anyway that a few megabytes spent on caching won't have any serious impact anyway.
  • Can i cache a WHOLE page ?
    - Basically yes, just write a dump servlet/jsp that doesn't itself put out any data except headers,cookies and create all the output that it should contain in a cacheable subpage.
  • Can i cache a Binary content ?
    - As in version 0.9.1 only caching character data is supported.
    In practice this means that everything written on getWriter() will be held in cache, all that is written on getOutputStream() will be lost.
    At first because the cache is aimed at character content.
    In future releases the cache may became ably to cache binary data too if the community decides that this feature should be created.
  • Why should i want to cache only a part of the page ?
    - Because you might need content on the page that isn't static, e.g. Username or something else like it. Caching only a part of the page will still result much better performance than not caching anything at all. At least in most pages.
  • Can i create a cache rule of my own ?
    - Ofcourse.
    Just extend the SpeedsterRule class. I recommend that you read the source of the 2 original rules (event and time based) at first. You might maybe able to extend one of them and use code that already supports your won idea.
  • Why doesn't <%@ include file="/cached/x.jsp" %> work ?
    - This a compilation time instuction, not a runtime instruction. Only runtime includings can be cached. Please see the documentation.
  • Can xslt processing be used with cacheing ?
    - Yes it can. I recommend you transofrm the xml your subpage, so the already trasnformed output can be cached. This is certainly faster than transofrming it each time user visits the page.
  • Can I use SpeedsterServlet in my commercial product ?
    - Yes as long as you carry it's licence and correct author information around with it, you can use it everywhere you want to.
  • Is ServletSpeedster compatible with my X framework ?
    - Probably yes. While ServletSpeedster doesn't really work as an separate application it has no real limits where it couldn't be used. If you can magine page splitting into parts on your framework, you can use ServletSpeedster.
  • How could i possibly profit from using it?
    - Basically the speed of your servlet serving means money. You can allow yourself cheaper servers cause they don't have to be oriented on massive internal processing speed (instead of that they can focus on faster net and more ram with a lower budget.). You can spare your database servers from unnecessary requests (if the data hasn't changed, why should the db look it up all the time ?).
  • How much memory will using compression save ?
    - It depends on the output of your page. The larger it is and the more alike it's contents are (a large html table is a very good compression target) the better the compression saving will probably be.
    Please notice that it may have no saving at all on very small contents so use compression wisely. Also there performance will drop a bit if compression is being turned on.
  • My cached subpages don't appear in the statistics.
    - The load-on-startup value of the servlet definition must be greater than the one of statistics servlet, otherwise it will not appear on the statistics.
  • How can i get an up-to-date version for sure ?
    Get the current version from cvs.
    cvs login
    cvs -z3 co speedster