Part C Question 2 of 4: (14 marks) Implement the StaffMember and Subject classes which support the functionality described above and the following additional functionality. 1. The StaffMember class must have a list of Subjects allocated to the staff member to teach. 2. The Subject class must maintain a map of StaffMembers allocated to teach the subject along with their load allocation for the particular subject. 3. The StaffMember and Subject classes must implement the Allocatable interfaces defined below: public interface Allocatable { public void allocate(T t); } You only need to implement the allocate method in the Subject class. Assume it is already implemented in the StaffMember class. You can write it as public void allocate(Subject subject) { ... } 4. The allocate method of the Subject class must allocate a StaffMember using the following logic: An allocation should happen only if staff member has an unallocatedLoad greater than 0. If the unallocatedLoad of the Subject is less than the unallocatedLoad of the StaffMember: The staff member will be assigned to the subject, with a teaching load equal to the unallocatedLoad of the subject. Call the allocate method of the StaffMember class, which must add the Subject to the staff member. The unallocated load for the subject will be set to 0. If the unallocatedLoad of the Subject is greater than the unallocatedLoad of the StaffMember: The staff member will be assigned to the subject, with a teaching load equal to the unallocatedLoad of the staff member. Call the allocate method of the StaffMember class, which must add the Subject to the staff member. The unallocated load for the subject will be set to the unallocated load, minus the load just allocated to this staff member.

Question

Part C Question 2 of 4: (14 marks)

Implement the StaffMember and Subject classes which support the functionality described above and the following additional functionality.

1. The StaffMember class must have a list of Subjects allocated to the staff member to teach.

2. The Subject class must maintain a map of StaffMembers allocated to teach the subject along with their load allocation for the particular subject.

3. The StaffMember and Subject classes must implement the Allocatable interfaces defined below:
     public interface Allocatable <T> {  
       public void allocate(T t);
   }

You only need to implement the allocate method in the Subject class.

Assume it is already implemented in the StaffMember class. You can write it as
public void allocate(Subject subject) { ... }

4. The allocate method of the Subject class must allocate a StaffMember using the following logic:

An allocation should happen only if staff member has an unallocatedLoad greater than 0.

If the unallocatedLoad of the Subject is less than the unallocatedLoad of the StaffMember:

The staff member will be assigned to the subject, with a teaching load equal to the unallocatedLoad of the subject.

Call the allocate method of the StaffMember class, which must add the Subject to the staff member.

The unallocated load for the subject will be set to 0.

If the unallocatedLoad of the Subject is greater than the unallocatedLoad of the StaffMember:

The staff member will be assigned to the subject, with a teaching load equal to the unallocatedLoad of the staff member.

Call the allocate method of the StaffMember class, which must add the Subject to the staff member.

The unallocated load for the subject will be set to the unallocated load, minus the load just allocated to this staff member.

BlackTom AI · Accepted Answer

The provided input appears to describe a programming task rather than a standard multiple-choice question with explicit options. In order to align with the expected analysis format, I will assess the design and logic that are present in the given code snippet, and highlight strengths, potential issues, and considerations you should ensure when implementing the described behavior. First, note the core requirements implied by the prompt: - There should be two classes, StaffMember and Subject, each with state to track allocations and loads. - StaffMember must maintain a list of Subjects allocated to teach. - Subject must maintain a map of StaffMembers allocated to teach the subject along with their individual load allocations for that subject. - An Allocatable interface exists with a method allocate(T t). - The Subject.allocate(StaffMember) method must implement allocation logic based on unallocated loads of the subject and the staff member, and must invoke a method on StaffMember to reflect the allocation. Now, examine the provided code structure and logic piece by piece. 1) Allocatable interface and method signatures - The interface Allocatable { void allocate(T t); } is straightforward and correctly generic, allowing implementations to allocate the given type T. - The instructions state that only the allocate method in Subject needs to be implemented, with the assumption that StaffMember's allocate is already implemented. This matches the design where Subject delegates the actual association to StaffMember after computing the allocation amount. 2) StaffMember class design (as shown) - Fields: staffId, clusterId, load, allocatedLoad, and a List allocatedSubjects. - The constructor initializes the staff member with a total load and an empty list of allocated subjects. allocatedLoad starts at 0, which is sensible. - getUnallocatedLoad() returns load - allocatedLoad, representing how much teaching capacity remains for this staff member. This is a logical and essential accessor for the allocation process. - addSubjectAllocation(Subject subject, int allocation) updates the allocatedSubjects list and increments allocatedLoad by the given allocation. This mirrors the required behavior to reflect that the staff member now teaches an additional subject with the specified load. - The allocate(Subject subject) method is left as a placeholder in the snippet, with a comment that it can call subject.addStaffAllocation(...) and is assumed to be implemented elsewhere. This aligns with the requirement that StaffMember’s allocation mechanism is provided elsewhere, though in a complete implementation you would expect this method to update internal data structures accordingly (e.g., ensure that the Subject is added to allocatedSubjects or that other tracking is updated). 3) Subject class design (as shown) - Fields: subjectId, clusterId, load, allocatedLoad, and a Map staffAllocations. - The constructor initializes the subject with a total load, an empty map of staff allocations, and allocatedLoad set to 0. - getUnallocatedLoad() returns load - allocatedLoad to reflect remaining teaching load required for the subject. - The allocate(StaffMember staffMember) method contains the core logic to allocate a staff member to the subject, given the constraints: - It first checks that both the staff member has unallocated load (> 0) and the subject has unallocated load (> 0). - It then determines the allocation amount based on who has the smaller unallocated load, with the subject's unallocated load taking precedence if smaller, or else allocating the staff member’s remaining unallocated load. - After calculating the allocation, it updates the subject’s staffAllocations map, increments allocatedLoad accordingly, and calls StaffMember.addSubjectAllocation(this, allocation) to reflect the allocation on the staff member side. - Finally, it calls staffMember.allocate(this) to trigger the staff member’s side processing (as per the requirement to invoke the StaffMember allocate method). 4) Interaction and mutual updates - The design ensures a bilateral update: Subject tracks which staff members are allocated and how much load they’re responsible for, while StaffMember tracks which subjects it teaches and the total allocated load. - The allocation flow adheres to the stated rule: an allocation only occurs if unallocatedLoad > 0 on the staff member, and the subject has unallocated load, and the amount allocated is the minimum of the two unallocated loads depending on the comparison. - The instruction to call StaffMember.allocate(this) from Subject.allocate creates a potential circularity concern if StaffMember.allocate also attempts to allocate the same subject again. This could lead to repeated allocations or infinite recursion unless StaffMember.allocate is implemented to be idempotent or to check whether the subject is already allocated. In a robust implementation, you should ensure that these methods guard against repeated allocations for the same subject. 5) Potential issues and improvements to consider - Guard against duplicates: If allocate(StaffMember) is called multiple times for the same subject-staff pair, the code should detect and prevent duplicate allocations (e.g., by checking staffAllocations.containsKey(staffMember) before proceeding). - Idempotence: StaffMember.allocate(Subject) should be designed so that repeated calls with the same subject do not corrupt allocatedLoad or allocatedSubjects by adding duplicates. Use a set or a check to prevent double-adding. - Consistency of allocatedLoad: Ensure that allocatedLoad is always kept in sync with the sum of allocations in staffAllocations. A potential risk is if one side updates allocatedLoad but the other side does not update its own tracking, leading to inconsistent state. - Thread-safety: If allocations could occur concurrently in a real system, synchronization or concurrent data structures would be necessary to avoid race conditions. - Edge cases: Consider what happens when load or unallocated loads are zero or negative due to erroneous state changes. The current checks (staffUnallocatedLoad > 0 && subjectUnallocatedLoad > 0) help, but additional validation might be prudent. - Separation of concerns: Having Subject.allocate call StaffMember.allocate directly creates a tight coupling. An alternative approach could be to have a central Allocator or a coordinator that manages allocations and updates both sides in a single transaction to avoid inconsistent states. 6) Summary assessment - The conceptual approach captured in the code aligns with the described requirements: a Subject maintains a map of StaffMembers to their allocated loads, a StaffMember maintains a list of Subjects they teach, and the allocate logic uses unallocatedLoad to determine the amount to allocate and updates both sides accordingly. - However, the snippet leaves some implementation details incomplete (notably the StaffMember.allocate method) and introduces potential pitfalls around idempotence and double-allocation. In a complete, robust solution, you would flesh out StaffMember.allocate to properly update internal structures, add safeguards against repeated allocations, and ensure that the mutual state between StaffMember and Subject remains consistent under all allocation paths. - If you intend to proceed with a full implementation, focus on ensuring that allocate calls are idempotent, that you prevent duplicate entries in allocatedSubjects and staffAllocations, and that the unallocatedLoad computations remain consistent when allocations occur from both sides.

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