Multithreading during model save

[neha_gupta03]

Hi,

If a model is being updated by two different threads with different attributes. For ex one thread is called from OCC service to update the model and the other thread for example from email is trying to update the same model simultaneously. How can we ensure that both the models update their data properly without each losing others updated data in the context.

[rohit31_raj92]

Hi

Models are not thread safe and Model context is thread local hence you facing the issue .

As Model context is bind to the Hybris Request Scope only , which is similar to the standard request scope but belongs to a single thread only.hence we can say model Context is single thread only and model is thread local so we should synchronize access to setters.

Do refer to link for more details:

https://wiki.hybris.com/display/release5/Models

we ensure that both the models update their data properly without each losing others updated data in the context you should synchronize access to the setters if we are passing our Models to different threads, for example by using SessionService .

[arvind-kumar_avinash]

Please note that Models are not thread safe. If the model is being processed by multiple threads, you can synchronize access to the setters by using SessionService.

[neha_gupta03]

We can synchronize access to setters but what if one thread is updating one attribute of model like email and other thread is updating different attribute like password and they are both trying to do modelservice.save. Then how setters synchronization will work here.

[arvind-kumar_avinash]

You can use lock(PK itemPK) method of ModelService.