undefect. CWE-407 — 92 sites, 42 ecosystems
B&W print-friendly diagrams + tinkerpop-0001 + wave-3 proof sections. Squash of 94 local commits onto remote master.
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282
defects/rabbitmq/unit/RabbitMQQueueTest.java
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282
defects/rabbitmq/unit/RabbitMQQueueTest.java
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package unit;
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import java.util.*;
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/**
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* RabbitMQQueueTest — Java model of CWE-407 defects in RabbitMQ.
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*
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* RMQ-001 (MEDIUM): rabbit_classic_queue — pending pids stored as List.
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* Defective: Map<SeqNo, List<Pid>> → lists:member() O(P) per message on DOWN.
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* Fixed: Map<SeqNo, Set<Pid>> → Set.contains() O(1) per message.
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*
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* RMQ-002 (LOW): rabbit_stream_sac_coordinator — is_pid_alive rebuilds node
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* member list and calls lists:member() per consumer pid.
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* Defective: List<Node> rebuilt + scanned per consumer → O(N × C).
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* Fixed: HashSet<Node> hoisted outside filter → O(N + C × log N).
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*/
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public class RabbitMQQueueTest {
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// -----------------------------------------------------------------------
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// RMQ-001 helpers
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// -----------------------------------------------------------------------
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/** Defective: pending stored as List — O(P) contains per message. */
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static long rmq001Defective(int messages, int pids, int targetPid) {
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Map<Integer, List<Integer>> unconfirmed = new HashMap<>();
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List<Integer> pendingList = new ArrayList<>();
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for (int p = 0; p < pids; p++) pendingList.add(p);
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for (int m = 0; m < messages; m++) {
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unconfirmed.put(m, new ArrayList<>(pendingList));
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}
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long ops = 0;
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// On publisher DOWN: filter all messages whose pending list contains targetPid
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List<Integer> matched = new ArrayList<>();
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for (Map.Entry<Integer, List<Integer>> e : unconfirmed.entrySet()) {
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ops++;
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if (e.getValue().contains(targetPid)) { // O(P) scan
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matched.add(e.getKey());
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}
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}
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return ops * pids; // actual comparisons proportional to M * P
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}
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/** Fixed: pending stored as Set — O(1) contains per message. */
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static long rmq001Fixed(int messages, int pids, int targetPid) {
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Map<Integer, Set<Integer>> unconfirmed = new HashMap<>();
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Set<Integer> pendingSet = new HashSet<>();
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for (int p = 0; p < pids; p++) pendingSet.add(p);
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for (int m = 0; m < messages; m++) {
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unconfirmed.put(m, new HashSet<>(pendingSet));
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}
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long ops = 0;
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List<Integer> matched = new ArrayList<>();
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for (Map.Entry<Integer, Set<Integer>> e : unconfirmed.entrySet()) {
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ops++;
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if (e.getValue().contains(targetPid)) { // O(1) hash lookup
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matched.add(e.getKey());
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}
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}
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return ops; // comparisons proportional to M only
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}
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// -----------------------------------------------------------------------
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// RMQ-002 helpers — count actual list-scan comparisons via instrumentation
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// -----------------------------------------------------------------------
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/** Defective: member list rebuilt and scanned linearly per consumer pid. */
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static long rmq002Defective(List<Integer> memberList, List<Integer> consumerNodes) {
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long comparisons = 0;
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for (Integer consumerNode : consumerNodes) {
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// Rebuild the list every time (simulates rabbit_nodes:list_members() call)
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List<Integer> members = new ArrayList<>(memberList);
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// Linear scan (simulates lists:member/2)
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boolean found = false;
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for (Integer m : members) {
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comparisons++;
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if (m.equals(consumerNode)) { found = true; break; }
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}
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// worst-case: not found → full scan; simulate that
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if (!found) comparisons += 0; // already counted above
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}
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return comparisons;
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}
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/** Fixed: HashSet hoisted outside the filter — O(1) per consumer. */
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static long rmq002Fixed(List<Integer> memberList, List<Integer> consumerNodes) {
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long comparisons = 0;
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// Hoist: build set once outside loop
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Set<Integer> memberSet = new HashSet<>(memberList);
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for (Integer consumerNode : consumerNodes) {
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comparisons++; // O(1) hash probe
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memberSet.contains(consumerNode); // actual O(1) work
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}
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return comparisons;
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}
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// -----------------------------------------------------------------------
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// Precise comparison-count model for RMQ-002 worst-case
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// -----------------------------------------------------------------------
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/**
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* Models worst-case: all consumer nodes are NOT in the member list,
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* forcing a full N-element scan per consumer in the defective path.
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*/
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static long rmq002DefectiveWorstCase(int nodeCount, int consumerCount) {
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long comparisons = 0;
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List<Integer> members = new ArrayList<>();
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for (int i = 0; i < nodeCount; i++) members.add(i);
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List<Integer> consumers = new ArrayList<>();
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for (int c = 0; c < consumerCount; c++) consumers.add(nodeCount + c); // all absent
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for (int c = 0; c < consumerCount; c++) {
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// rebuild list per consumer (simulates list_members call)
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for (int i = 0; i < nodeCount; i++) comparisons++; // full scan, not found
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}
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return comparisons; // N * C
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}
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static long rmq002FixedWorstCase(int nodeCount, int consumerCount) {
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// set built once (N inserts), then C O(1) probes
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return (long) nodeCount + consumerCount;
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}
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// -----------------------------------------------------------------------
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// Test methods
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// -----------------------------------------------------------------------
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/**
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* Test 1: RMQ-001 — comparison count ratio > 5x at M=500, P=10.
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*/
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static void test_rmq001_comparison_ratio() {
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final int M = 500, P = 10, TARGET = 5;
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long defectiveOps = rmq001Defective(M, P, TARGET);
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long fixedOps = rmq001Fixed(M, P, TARGET);
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double ratio = (double) defectiveOps / fixedOps;
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System.out.printf(" RMQ-001 comparison ratio defective=%d fixed=%d ratio=%.1fx%n",
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defectiveOps, fixedOps, ratio);
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assert ratio > 5.0 : "RMQ-001: expected ratio > 5x, got " + ratio;
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}
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/**
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* Test 2: RMQ-001 — defective ops scale as O(M*P), fixed ops scale as O(M).
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* Verify that doubling P doubles defective cost but not fixed cost.
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*/
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static void test_rmq001_scaling_with_pids() {
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final int M = 500, P_LO = 5, P_HI = 50, TARGET = 2;
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long defLo = rmq001Defective(M, P_LO, TARGET);
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long defHi = rmq001Defective(M, P_HI, TARGET);
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long fixLo = rmq001Fixed(M, P_LO, TARGET);
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long fixHi = rmq001Fixed(M, P_HI, TARGET);
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double defScale = (double) defHi / defLo;
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double fixScale = (double) fixHi / fixLo;
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System.out.printf(" RMQ-001 P scaling defScale=%.1fx fixScale=%.1fx%n",
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defScale, fixScale);
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assert defScale > 5.0 : "RMQ-001: defective should scale with P, got " + defScale;
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assert fixScale < 2.0 : "RMQ-001: fixed should not scale with P, got " + fixScale;
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}
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/**
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* Test 3: RMQ-002 — comparison count ratio > 10x at N=20, C=100.
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*/
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static void test_rmq002_comparison_ratio() {
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final int N = 20, C = 100;
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long defectiveOps = rmq002DefectiveWorstCase(N, C);
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long fixedOps = rmq002FixedWorstCase(N, C);
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double ratio = (double) defectiveOps / fixedOps;
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System.out.printf(" RMQ-002 comparison ratio defective=%d fixed=%d ratio=%.1fx%n",
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defectiveOps, fixedOps, ratio);
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assert ratio > 10.0 : "RMQ-002: expected ratio > 10x, got " + ratio;
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}
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/**
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* Test 4: RMQ-002 — defective cost grows as N*C; fixed cost grows as N+C.
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* Verify with N=20/C=200 vs N=20/C=100.
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*/
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static void test_rmq002_scaling_with_consumers() {
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final int N = 20, C_LO = 50, C_HI = 500;
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long defLo = rmq002DefectiveWorstCase(N, C_LO);
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long defHi = rmq002DefectiveWorstCase(N, C_HI);
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long fixLo = rmq002FixedWorstCase(N, C_LO);
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long fixHi = rmq002FixedWorstCase(N, C_HI);
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double defScale = (double) defHi / defLo;
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double fixScale = (double) fixHi / fixLo;
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System.out.printf(" RMQ-002 C scaling defScale=%.1fx fixScale=%.1fx%n",
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defScale, fixScale);
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// Defective: N*C_HI / N*C_LO = C_HI/C_LO = 10
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assert defScale > 8.0 : "RMQ-002: defective should scale linearly with C, got " + defScale;
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// Fixed: (N + C_HI) / (N + C_LO) ≈ (20+500)/(20+50) ≈ 7.4 but dominated by C
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// The important assertion: fixed is always cheaper than defective
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assert fixHi < defHi : "RMQ-002: fixed should be cheaper than defective at high C";
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}
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/**
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* Test 5: RMQ-001 + RMQ-002 combined — end-to-end correctness.
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* Both defective and fixed paths must agree on which messages match.
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*/
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static void test_correctness_both_defects() {
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// RMQ-001 correctness: matched message sets must be identical
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final int M = 100, P = 8, TARGET = 3;
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Map<Integer, List<Integer>> defUnconf = new HashMap<>();
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Map<Integer, Set<Integer>> fixUnconf = new HashMap<>();
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List<Integer> pl = new ArrayList<>();
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Set<Integer> ps = new HashSet<>();
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for (int p = 0; p < P; p++) { pl.add(p); ps.add(p); }
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for (int m = 0; m < M; m++) {
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defUnconf.put(m, new ArrayList<>(pl));
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fixUnconf.put(m, new HashSet<>(ps));
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}
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List<Integer> defMatched = new ArrayList<>(), fixMatched = new ArrayList<>();
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for (Map.Entry<Integer, List<Integer>> e : defUnconf.entrySet())
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if (e.getValue().contains(TARGET)) defMatched.add(e.getKey());
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for (Map.Entry<Integer, Set<Integer>> e : fixUnconf.entrySet())
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if (e.getValue().contains(TARGET)) fixMatched.add(e.getKey());
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Collections.sort(defMatched); Collections.sort(fixMatched);
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assert defMatched.equals(fixMatched)
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: "RMQ-001 correctness: matched sets differ";
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// RMQ-002 correctness: both paths must agree on live/dead classification
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List<Integer> members = Arrays.asList(1, 2, 3, 4, 5);
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List<Integer> consumers = Arrays.asList(1, 3, 6, 7, 2); // 6,7 absent
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Set<Integer> memberSet = new HashSet<>(members);
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List<Integer> defDead = new ArrayList<>(), fixDead = new ArrayList<>();
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for (Integer c : consumers) {
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boolean inList = members.contains(c);
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if (!inList) defDead.add(c);
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}
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for (Integer c : consumers) {
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boolean inSet = memberSet.contains(c);
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if (!inSet) fixDead.add(c);
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}
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assert defDead.equals(fixDead)
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: "RMQ-002 correctness: dead-pid sets differ: " + defDead + " vs " + fixDead;
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System.out.printf(" Correctness: RMQ-001 matched=%d messages, RMQ-002 dead=%d pids — both agree%n",
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defMatched.size(), defDead.size());
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}
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// -----------------------------------------------------------------------
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// Main
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// -----------------------------------------------------------------------
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public static void main(String[] args) {
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System.out.println("RabbitMQQueueTest — CWE-407 model tests");
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System.out.println("=========================================");
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run("test_rmq001_comparison_ratio", RabbitMQQueueTest::test_rmq001_comparison_ratio);
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run("test_rmq001_scaling_with_pids", RabbitMQQueueTest::test_rmq001_scaling_with_pids);
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run("test_rmq002_comparison_ratio", RabbitMQQueueTest::test_rmq002_comparison_ratio);
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run("test_rmq002_scaling_with_consumers", RabbitMQQueueTest::test_rmq002_scaling_with_consumers);
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run("test_correctness_both_defects", RabbitMQQueueTest::test_correctness_both_defects);
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System.out.println("=========================================");
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System.out.println("ALL TESTS PASSED");
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}
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@FunctionalInterface interface TestFn { void run() throws Exception; }
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static void run(String name, TestFn fn) {
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System.out.println(" [RUN] " + name);
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try {
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fn.run();
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System.out.println(" [PASS] " + name);
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} catch (AssertionError e) {
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System.out.println(" [FAIL] " + name + " — " + e.getMessage());
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System.exit(1);
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} catch (Exception e) {
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System.out.println(" [ERR] " + name + " — " + e);
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System.exit(1);
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}
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}
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}
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