Discuss OMG OMG-OCUP2-ADV300 Exam Topic 10 Question 54

OMG-OCUP2-ADV300 Exam - Topic 10 Question 54 Discussion

Posted by Justine on Oct 20, 2026 at 12:58 PM

Choose the correct answer:

Consider the following diagram:

What does the string {guarded} mean?

AThe execution of op1 is guarded by one or more exceptions which it will handle if they arise.

BMultiple invocations of op1 that overlap in time may occur to one instance, but only the first one will get handled.

CMultiple invocations of op1 that overlap in time may occur to one instance, but only one is allowed to commence.

DThe execution of op1 Is guarded by one or more exceptions. Behaviors invoking it are required to handle these exceptions

Suggested Answer: C

In UML, when an operation is marked with the term {guarded}, it means that the operation is subject to a concurrency constraint. It specifies that the operation cannot have overlapping executions; in other words, if the operation is already in execution, a new attempt to start it will have to wait until the current one completes. This prevents race conditions and ensures thread safety for that operation when dealing with concurrent accesses in multi-threaded environments. This interpretation is based on the UML 2.x Superstructure Specification, which describes how operations can be marked with constraints to define their behavioral features in terms of concurrency.

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3 comments · newest first

Ira 2 days ago

I'm a bit confused about the wording in the options. Does "guarded" imply that exceptions are handled by the operation itself or by the caller?

Tonette 7 days ago

I remember a practice question that discussed overlapping invocations, and I think it was about how only one can start at a time. That makes me lean towards option C.

Linwood 13 days ago

I think the term "guarded" might relate to how exceptions are managed, but I'm not entirely sure which option fits best.

Thread summary

● Consensus

Community pick: Yes strong agreement

Vote breakdown

A 1%

B 1%

C 92%

D 3%

Summary updated from 3 comments · last activity 2 days ago

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