Looks like Joris has done some good work here:
-------- Original Message -------- Subject: startup time Date: Thu, 29 Apr 2004 08:20:03 -0700 (PDT) From: Joris Verschoor <[EMAIL PROTECTED]> To: Gavin King <[EMAIL PROTECTED]>
Hi,
gmane doesn't seem to work, so I'm mailing you.
I've been fiddling a bit, and I managed to decrease the startup time by about 40% (loading all but duplicate hbm.xml files from the test directory ABCProxy/Simple)
I haven't done any SAXing, because it will clutter the source. And maybe someone else is already doing that path.
*** XMLHelper *** I've adjusted the XMLHelper createSAXReader and createDOMReader to act cache the reader. Creating a reader takes some time. I didn't use a threadlocal, but I should.. Instead I created a static field, because I'm lazy, and if anybody wants the code, I'll fix it.
*** Databinder *** I changed in SessionFactoryImpl the Templates field in the constructor to a lazy loading mechanism. templates is only accessed when doing calling openDatabinder. Since I don't use that (JCA?) Theres no need to process the xslt file. If it's used, you could always first check if the user has set the property, so you'll get errors early.
*** Serializing Document objects *** I gained the most performance by serializing the Document objects and deserializing them, instead of parsing the XML files every time you start your application. This way you can still use DOM, and with only minor changes to hibernate the startup speeds up alot.
The problem here is, that caching is somewhat tricky: -Where do I store my cached files and how to name them? -Checking modifications, I did this using getResource().getFile(). But if it's in a jar, you'll need to check that first. (I saw a thread about checking if the xml files changed somewhere too, I recall it would be difficult because of jars)
On the other hand, startup time is mostly annoying to developers. When creating a webapp, I use an exploded war structure, so all resources are files. This way I can cheat a bit. And you can always fall back to loading the xml file if you can't get a save way to tlel if a file is modified.
Also, in sessionfactoryimp, you can check for if (usrs || batchSize != 0) To prevent the DB connection in the constructor.
Maybe I'll try to use sax for reading the xmls next week.
O.T. Oh, I was thinking about storing configuration in a database. That
way you would only need to set the jdbc connection, and a bootstrap
query/table or whatever to return the configuration. When
developing/testing for multiple databases, you don't need to
swap/edit xmls.
I did this for a properties file I used to use for server
configurations, but now I just have a simple table ServerConfig
(property/servername/value).
Let me know what you think about it.
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