MQSeries.net :: View topic - How to Make An XML Update Operation Single-threaded

wmbv7newbie · Posted: Sat Aug 22, 2015 9:49 pm Post subject:

Hi,

We are working on a solution to minimise logging into an application multiple times. The idea is to login to the target system (Salesforce) once, save the sessionId to a cache xml (basically an xml file on the server with logging-in details as name-value pairs for multiple users) and use it for subsequent calls. When the sessionId expires, login to SFDC again, get a new sessionId, update the cache xml value and continue processing.

We were thinking to use Java for the "updating cache xml with new sessionId" part of the solution. However, we are stuck at how to make this update operation single-threaded (I might be using the wrong term here, so giving an example to explain in detail). Consider below scenario -

Suppose there are two different operations running at the same time to use SFDC (for e.g. queryOrderById and getUserInfo). Both found at the same time that the sessionId in cache has expired. So, both try to get new sessionId at the same time. Till this point, it is fine. But then both try to update the cache xml with new value at the same time. This might be an issue. So, we wanted to make the Java application which is responsible for updating the xml as single-threaded application so that only one instance can use it at a time and others are blocked until it completes. But we dont know how to achieve this. Any hints would help.

Any other alternative ideas to accomplish this is also welcome.

Other details -
1. We are using IIB V9 with MQ 7.5.0.3
2. Global cache is not an option at the moment. However, we might consider it later for the solution, as it involves extra settings and config on the servers, for which we dont have enough time right now. If nothing else works, of course we will go for it

Thanks in advance!