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Re: Multithreaded XML file parsing?




On 20 Aug 2006, at 00:14, Saad Mahamood wrote:

Some followup responses:

In the end I did go ahead a use just a single threaded instance
parsing the XML file using SAX, and the performance was much better
than I had initially expected. However I have a follow question:

One area in my code that could benefit from threading is the following:

File[] dirChildren = gmlDir.listFiles(filter);
for(File aFile : dirChildren) {
System.out.println("Got here!");
//Iterate through the list of files and start loading GML files:
GMLThread thread = new GMLThread(aFile);
thread.run();
try {
thread.join();
}
catch(InterruptedException ie) {
ie.printStackTrace();
}
System.out.println("Got here! 2");
}



I'm not loading one XML file, but several in a directory. However, I can't figure out how to iterate through the File arraylist and start several parsing threads, whilst making the main application thread wait until they've have all completed? The current code above only makes the "for each" loop wait until the thread its spawned has completed, which isn't the behaviour I want.

Something like this?

	File[] dirChildren = gmlDir.listFiles(filter);
	Thread[] threads = new Thread[dirChildren.length];
       for(File aFile : dirChildren) {
           GMLThread thread =  new GMLThread(aFile);
           thread.start();
       }
       for(Thread aThread : threads) {
           try {
               thread.join();
           }
           catch(InterruptedException ie) {
               ie.printStackTrace();
           }
       }

Jerry

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References: 
 >Multithreaded XML file parsing? (From: "Saad Mahamood" <email@hidden>)
 >Re: Multithreaded XML file parsing? (From: Oisin Hurley <email@hidden>)
 >Re: Re: Multithreaded XML file parsing? (From: "Saad Mahamood" <email@hidden>)



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