OMG-OCUP2-FOUND100 Leak Questions

In UML sequence diagrams, an execution specification is represented by a thin rectangle along a lifeline. It shows where in time the execution takes place, starting with the initiation of an operation or process and ending when that process is complete.

In the interaction diagram provided, we can see an execution specification on the lifelinep1: Pthat starts after the message corresponding to point 3 is received and ends just before the message corresponding to point 5 is sent. This means the execution specification is bracketed by points 3 and 5.

Points 1 and 2 represent message sends, 1 and 4 could represent a message send and receive for the same message, which doesn't typically represent the full execution specification. Points 2 and 3 don't represent a logical start and end of an execution specification because they're on different lifelines.

Therefore, the correct answer is:

D. 3, 5

The provided image depicts a block diagram of a sensor controller represented as a state machine. The state machine transitions between the following states:

• Initializing
• Calibrating
• Ready
• Acquiring Data

The question specifies the state machine starts in the Ready state and theacquireDataevent triggers the transition.

Analyzing the image, we can identify the following behaviors for the scenario:

• logStatus: This behavior is depicted in the diagram as the first action upon exiting the Ready state. It most likely logs the current state of the sensor controller.
• deploy: The transition from Ready to Acquiring Data triggers the deploy behavior. This likely involves preparing the sensor for data acquisition.
• scanTarget: Upon entering the Acquiring Data state, the scanTarget behavior is initiated. This suggests the sensor controller is actively collecting data from the target.

Therefore, the complete sequence of behaviors islogStatus, followed bydeploy, and lastlyscanTarget, before reaching the Acquiring Data state.

Justification for excluding other options:

• Option A (deploy only) excludes the initial state logging and target scanning actions.
• Option B (logStatus.deploy) excludes the target scanning upon entering the Acquiring Data state.
• Option C (deploy, scanTarget) omits the initial state logging.
• Option E (logStatus.deploy.scanTarget.logStatus) includes an extra logStatus action after target scanning, which is not supported by the diagram.

In conclusion, based on the state machine diagram and the behavior descriptions, option D (logStatus.deploy.scanTarget) accurately reflects the sequence of actions that occur before the sensor controller arrives at the Acquiring Data state.

Abstraction in UML and software modeling often incorporates the technique of information hiding. Information hiding is a principle that supports abstraction by ensuring that unnecessary details about software components are not exposed to other parts of the system. This encapsulation strengthens modularity and keeps various parts of the program independent of one another, which simplifies complexity in large systems. Abstraction and information hiding are closely related; abstraction focuses on the high-level structure of the system, while information hiding protects the internal states and functionality of components, allowing changes without extensive impact on other system parts.

In UML, the aggregation kind 'composite' is one of the two types of aggregation, shared and composite. Composite aggregation, also known as composition, implies that the composed objects do not have a separate lifecycle from the owner object and are parts of the whole. This is in contrast to shared aggregation (aggregation), where the parts can be shared with different owners and have their own lifecycle.

Let's look at the options:

A. Composite aggregation implies ownership and is related to, but not equivalent to namespace containment. Namespace containment is more about the scope for named elements rather than lifecycle management.

B. While it's true that instances of the composed object's type are often associated only with the composite object, the key aspect of composite aggregation is not just the exclusive context but the lifecycle dependency, which is not captured in this option.

C. This option is correct because, in UML, composite aggregation (composition) implies that the parts are existentially dependent on the whole. When the composite (whole) object is destroyed, so are all of its parts, indicating a strong lifecycle dependency between the composite object and its composed parts.

D. This option describes a relationship more akin to set theory than UML composition. In UML, composite aggregation doesn't deal with subsets and unions in the context of set theory.

Thus, the most accurate answer, according to the UML specification regarding composite aggregation, isC: When the Property's composite object ceases to exist, all of its composed objects also cease to exist.