Simple Validation: Can the Priority Queue and Graph Detect a Crash Before CSV Load?

You don't need advanced algorithms to check if your current priority queue will cause a crash when loading CSVs into the database. If you have:

• The dependency graph (edges: A → B means B depends on A)
• The priority queue/map (each entity/table has a priority value; lower = loaded earlier)

You can check for possible crashes as follows:

---

What Could Cause a Crash?

A crash (referential integrity error) occurs if you try to load a table before a table it depends on (i.e., a child before its parent). This happens when, for an edge A → B (B depends on A):

priority(A) >= priority(B)

This means B (the child) is loaded before or at the same time as A (the parent).

---

Simple Validation Algorithm

For each edge (A → B) in your graph:

1. Get the priorities: priority(A) and priority(B)
2. Check if priority(A) < priority(B)
   • If true: safe (parent loaded before child)
   • If false: possible crash (child loaded before parent)

If you find any edge where priority(A) >= priority(B), you have a risk of a crash.

---

Example Java-like Pseudocode

for (Edge edge : graph.edgeSet()) {
    Node parent = graph.getEdgeSource(edge); // A
    Node child  = graph.getEdgeTarget(edge); // B
    int parentPriority = priorityMap.get(parent).getPriority();
    int childPriority  = priorityMap.get(child).getPriority();
    if (parentPriority >= childPriority) {
        System.err.println("Potential crash: " + child + " (priority " + childPriority +
            ") depends on " + parent + " (priority " + parentPriority + ")");
    }
}

---

Summary Table

What you have	What to check	What it tells you
Dependency graph	For edge A→B:	If B depends on A,
Priority map/queue	priority(A) < priority(B)	safe to load B after A
	priority(A) >= priority(B)	possible crash

---

Conclusion

• You can detect if the current priority queue is safe using just the graph and the priority map.
• If all parent→child dependencies are respected (priority(parent) < priority(child)), you're safe to load.
• If not, flag the issue before loading to avoid database errors.

---

Need a code snippet for your exact class structure? Just ask!