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  1. #1
    JavaCoder is offline Member
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    Aug 2010
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    Question Leave thread yield or attempt join... or something else?

    I have a rather complex multi-threading problem I have solved but I'm not sure if I solved it the best way possible. I have a a java service that receives messages and stores them in Oracle by executing a stored procedure. The problem stems from two or more threads processing
    messages dealing with the trade calling the stored procedure at the same time. So if two threads are dealing with the same trade info we want them to update the database synchronously. Synchronous calls to the database alleviates unwanted locking in the DB. In the code contextIdentifier uniquely identifies what trade a message is for.

    Java Code:
    	private ConcurrentMap<String, Boolean> tradeLockMap = new ConcurrentHashMap<String, Boolean>();
    	In method that processes message...
    		// Context key to identify trade
    		String contextIdentifier = message.getContextIdentifier();
    		try {
    			while ([COLOR="Red"]![/COLOR]isLockAquired(contextIdentifier)) {
    		} finally {
    Method that locks trades so messages dealing with same trade are processed synchronously

    Java Code:
    	private boolean isLockAquired(String contextIdentifier) {
    		Boolean isTradeLocked = tradeLockMap.putIfAbsent(contextIdentifier, Boolean.TRUE);
    		if (isTradeLocked != null) {
    			return false;
    		return true;
    We used to have terrible database performance before adding this code in the java service but we still have a huge variance in the number of messages we push through per minute. We run 30 threads which are configured in our messaging system. I was thinking that joining the threads would be
    the best possible solution to the problem but I'm not sure how to do that since the code doesn't spawn the thread I want to join. I'm not even sure if doing a join would result in any performance gain. Thoughts???

    Last edited by Fubarable; 08-11-2010 at 07:34 PM. Reason: Moderator Edit: Code tags added

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
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    Moderator edit: code tags added.

    To do this, highlight your pasted code (please be sure that it is already formatted when you paste it into the forum; the code tags don't magically format unformatted code) and then press the code button, and your code will have tags.

    Another way to do this is to manually place the tags into your code by placing the tag [cod&#101;] above your pasted code and the tag [/cod&#101;] below your pasted code like so:

    Java Code:
      // your code goes here
      // notice how the top and bottom tags are different
    Good luck and welcome to the forum!

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