Using Phase4 in a multi threaded environment

[chamikaCN]

Hi Phillip,

I need to run the phase4 project in a multi-threaded environment. I am using the sendMessageAndCheckForReceipt()method to send the AS4 message. But as you have noted, it is non-thread-safe, since the Signal Message Consumer being modified inside the method. What would be the your suggestion to achieve my goal?

PS- I am using phase4 with my own SignalMessageConsumer class, which implements IAS4SignalMessageConsumer, hence the null check aOld == null on line 706 of AbstractAS4UserMessageBuilder.java will always be false.

[phax]

Hi @chamikaCN,
Sending multiple AS4 messages in parallel should be no problem, as long as you match the following requirements:

• Create a separate instance of the client or sender for every thread - so the custom signal message processor is no problem
• Make sure your signal message processor is either thread safe, or you place a separate instance per thread
• Make sure the phase4.wss4j.syncsecurity property is set to true - see https://github.com/phax/phase4/wiki/Configuration#phase4-properties

That's all I am aware of

[chamikaCN]

Thanks @phax

[chamikaCN]

Hi @phax,

One thing I noticed regarding this issue is that MockServletContext is also not thread-safe and gets created when a message-sending process is initiated in example tests with WebScopeManager.onGlobalBegin (MockServletContext.create ());. I overcame this problem by ensuring only one context was available when threads handle messages and destroying the context if no thread is in execution. Is there a thread-safe implementation of the ServletContext interface included in this project or any workaround you'd like to suggest?

[phax]

I think the MockServletContext can be made threadsafe quite easily. There is currently no other thread-safe alternative class present - sorry

[phax]

Will be part of ph-web 9.6.5 release

[chamikaCN]

thanks @phax

[phax]

Sorry I needed to tackle some other things so it is part of the ph-web 9.7.0 release and will be part of the phase4 1.4.0 release

[phax]

@chamikaCN Release 1.4.0 from https://github.com/phax/phase4/releases/tag/phase4-parent-pom-1.4.0 should fix the concurrency issue. Please note, that this version switched from Apache HttpClient v4 to v5 which might break existing integrations, so be careful.

[chamikaCN]

Thanks very much for the quick update and the advice as well 🙂 I'll make sure to take precautions prior to upgrading.