topic Re: facing problem to create folder concurrently in alfresco3.0 in Alfresco Archive

facing problem to create folder concurrently in alfresco3.0

suresheck — Wed, 27 Jun 2012 13:07:05 GMT

if(todayRef == null) { synchronized(this) { todayRef = fileFolderService.searchSimple(monthRef, today); if(todayRef == null) { todayRef = createNode(monthRef, today, ContentModel.TYPE_FOLDER

Re: facing problem to create folder concurrently in alfresco3.0

bisana — Wed, 27 Jun 2012 13:20:30 GMT

For others to help, it will be good if you can explain your problem
Also please use code tag to display your error message and codes
thanks
Joseph John

Re: facing problem to create folder concurrently in alfresco3.0

mrogers — Wed, 27 Jun 2012 13:29:00 GMT

And what is the value of "this" i.e. which object are you synchronizing on?

Re: facing problem to create folder concurrently in alfresco3.0

mrogers — Wed, 27 Jun 2012 13:32:06 GMT

If your code is in a retrying transaction then it will work. No need for the sync which is dangerous.

The duplicate create will fail. And then the next tran will see the folder exists and carry on.

Re: facing problem to create folder concurrently in alfresco3.0

suresheck — Thu, 28 Jun 2012 05:49:13 GMT

And what is the value of "this" i.e. which object are you synchronizing on?

Here this is the current object of InsertContentWebScript.

synchronized(this)
         {
            todayRef = fileFolderService.searchSimple(monthRef, today);
            if(todayRef == null)
            {
               todayRef = createNode(monthRef, today, ContentModel.TYPE_FOLDER);
            }
         }
Here first time when one client code access the todayRef.It gives todayRef = null and at the same time concurrently when sencond client code access this todayRef it gives again null.So it again call this createNode method.So gives exception.

org.alfresco.service.cmr.repository.DuplicateChildNodeNameException: Duplicate child name not allowed: WFMT_2012_06_27
        at org.alfresco.repo.node.db.hibernate.HibernateNodeDaoServiceImpl.setChildNameUnique(HibernateNodeDaoServiceImpl.java:1294)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)