Issue with Multi threading

Dear All,

We have implemented one DFC import service in our application. This import service will create one folder based on parameter which is being provided while calling this service. Once the folder is created, it will import files into that folder. This import service is being called by multiple threads at a time.

Now first thread is calling this service with parameter as Folder1 and at the same time second thread is also calling this service with same parameter Folder1. When two threads are trying to create the folder with same name then it is throwing error as folder already exists and sometimes documents is getting imported with incorrect folder id which leads to inconsistency in docbase.

Can you please let me know what I can do to prevent this error or inconsistency.

Thanks for your help

Regards,

Sumanta

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Comments

Francois Dauberlieu

Before you save the new folder, check if it exists and if yes, don't save the new object, use the xeistng one ....

pakira

Hi,

I am checking folder exists or not before creating new folder but it is failing sometimes.

aflowers001

What failure are you getting in checking for existence? What is ther error code/log?

Francois Dauberlieu

when creating and saving the folder, you should be able to catch the error/exception and if the error is that it already exists, then you cold get the existing one and use it for the remaing part of your process

ipmac

Hi,

This is really a multi-thread issue.

You should use a synchronized block to encapsulate your code for testing folder existence and folder creation.

You can use a static final object accessible from your thread as synchronizer :

// Define this as class field or find another way to get a unique object accessible from your threads
 private static final Object synchronizeObject = new Object();

 // In your code add a synchronize block
 synchronize (ClassName.synchronizeObject) {
      IDfFolder folder = (IDfFolder) session.getObjectByQualification("dm_folder where object_name='FolderName'");
      if (folder == null) {
           // create folder code
      }
 }

Best regards,

Pierre