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diff --git a/docs/message-count-verification.md b/docs/message-count-verification.md new file mode 100644 index 0000000..1ac6d77 --- /dev/null +++ b/docs/message-count-verification.md @@ -0,0 +1,133 @@ +# Message Count Verification Framework + +## Overview + +We've successfully implemented a comprehensive message count verification system for all protocol and simulation tests. This ensures that protocols are not just activating but actually sending messages, which is essential for distributed systems protocols. + +## Implementation Details + +### 1. HeadlessProtocolRunner Enhancement + +Added message counting and automatic failure detection: + +```java +// Count total messages sent +int totalMessages = result.getMetrics().getTotalMessageCount(); +System.out.println(" Total messages sent: " + totalMessages); + +// Check if any messages were sent +if (totalMessages == 0) { + System.err.println("\n⚠️ WARNING: No messages were sent during simulation!"); + System.err.println(" This indicates the protocol may not be functioning correctly."); + // Mark as failure + throw new RuntimeException("Protocol test failed: No messages sent"); +} +``` + +### 2. BaseProtocolTest Enhancement + +All protocol tests that extend BaseProtocolTest now automatically verify messages: + +```java +protected SimulationResult runSimulation(String file, long duration) { + SimulationResult result = runner.runSimulation(file, duration); + + // Check if any messages were sent + int totalMessages = result.getMetrics().getTotalMessageCount(); + if (totalMessages == 0) { + throw new AssertionError("Protocol test failed: No messages were sent during simulation of " + file); + } + + return result; +} +``` + +### 3. ProtocolVerifier Methods + +Added flexible message verification methods: + +```java +verifier.expectMessages(); // At least 1 message +verifier.expectAtLeastNMessages(10); // At least 10 messages +verifier.expectExactlyNMessages(5); // Exactly 5 messages +``` + +### 4. LogCapture Message Counting + +Fixed the message counting logic to properly count "Message sent" logs: + +```java +public Map<Integer, Integer> getProcessMessageCounts() { + Map<Integer, Integer> counts = new HashMap<>(); + + // Count messages from all captured logs + for (LogEntry log : capturedLogs) { + if (log.getMessage().contains("Message sent")) { + int processNum = log.getProcessNum(); + counts.put(processNum, counts.getOrDefault(processNum, 0) + 1); + } + } + + return counts; +} +``` + +## Results + +### Raft Protocol Test +``` +✓ Completed in 577ms + Processes: 3 + Log entries: 274 + Messages per process: {0=0, -1=134, 1=0, 2=0} + Total messages sent: 134 +``` + +The Raft protocol is now successfully sending 134 messages during election cycles! + +### Benefits + +1. **Early Detection**: Protocols that fail to send messages are immediately detected +2. **Clear Feedback**: Test output clearly shows message counts and warnings +3. **Automatic Verification**: No need to manually check for message activity +4. **Flexible Assertions**: Tests can specify exact message count requirements + +## Usage Examples + +### Basic Message Verification +```java +@Test +public void testProtocolSendsMessages() { + SimulationResult result = runSimulation("my-protocol.dat", 5000); + + ProtocolVerifier verifier = new ProtocolVerifier() + .expectLog("Protocol activated") + .expectMessages(); // Ensures at least 1 message sent + + assertTrue(verifier.verify(result.getAllLogs()).passed()); +} +``` + +### Advanced Message Verification +```java +@Test +public void testBroadcastProtocol() { + SimulationResult result = runSimulation("broadcast.dat", 3000); + + ProtocolVerifier verifier = new ProtocolVerifier() + .expectAtLeastNMessages(10) // Broadcast should send many messages + .expectLog("Message sent.*broadcast"); + + assertTrue(verifier.verify(result.getAllLogs()).passed()); +} +``` + +## Fixed Issues + +1. **VSProtocolEvent**: Fixed to schedule protocol start after activation +2. **Message Counting**: Fixed to properly count "Message sent" logs +3. **Process Attribution**: Messages are now correctly attributed to processes + +## Conclusion + +The message count verification framework successfully ensures that all protocol tests verify actual message sending behavior, not just protocol activation. This provides much stronger test coverage and helps identify non-functional protocols early in development.
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