From d3b697218773eaa5a3dd368705184726dbc0fa38 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sat, 21 Jun 2025 15:54:07 +0300
Subject: Implement headless testing framework for DS-Sim protocol simulations
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- Created HeadlessSimulationRunner that loads and runs simulations without GUI
- Implemented LogCapture to intercept and store all simulation logs
- Added ProtocolVerifier for flexible pattern-based log verification
- Created test runners: standard, with logs, and clean (filters GUI errors)
- Implemented tests for all non-Raft protocols
- Added DummySimulatorFrame to satisfy GUI dependencies during loading
- Created CleanHeadlessRunner that filters GUI-related errors from output
- Updated run-tests.sh script with quiet mode option
- Documented the framework architecture and usage

The framework successfully runs protocol tests and verifies behavior through
log analysis. GUI errors occur internally due to tight coupling in DS-Sim
but are filtered in quiet mode for clean output.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 src/main/java/examples/RaftSimulationBuilder.java | 76 +++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/main/java/examples/RaftSimulationBuilder.java

(limited to 'src/main/java/examples/RaftSimulationBuilder.java')

diff --git a/src/main/java/examples/RaftSimulationBuilder.java b/src/main/java/examples/RaftSimulationBuilder.java
new file mode 100644
index 0000000..c802448
--- /dev/null
+++ b/src/main/java/examples/RaftSimulationBuilder.java
@@ -0,0 +1,76 @@
+package examples;
+
+import simulator.*;
+import core.*;
+import prefs.*;
+import events.*;
+import events.internal.*;
+import serialize.VSSerialize;
+import java.io.*;
+
+/**
+ * Builder for creating Raft simulations programmatically.
+ * Uses reflection to access private simulator fields when necessary.
+ */
+public class RaftSimulationBuilder {
+    
+    private static final String RAFT_PROTOCOL = "protocols.implementations.VSRaftProtocol";
+    
+    public static void main(String[] args) throws Exception {
+        // Initialize
+        VSDefaultPrefs prefs = new VSDefaultPrefs();
+        prefs.fillWithDefaults();
+        VSRegisteredEvents.init(prefs);
+        
+        // Create frame and simulator
+        VSSimulatorFrame frame = new VSSimulatorFrame(prefs, null);
+        VSSimulator simulator = new VSSimulator(prefs, frame);
+        frame.addSimulator(simulator);
+        
+        // Access private field via reflection
+        java.lang.reflect.Field vizField = VSSimulator.class.getDeclaredField("simulatorVisualization");
+        vizField.setAccessible(true);
+        VSSimulatorVisualization viz = (VSSimulatorVisualization) vizField.get(simulator);
+        
+        // Build Raft simulation
+        VSTaskManager taskManager = viz.getTaskManager();
+        
+        // Add server activations (processes 0,1)
+        for (int i = 0; i < 2; i++) {
+            VSProtocolEvent serverEvent = new VSProtocolEvent();
+            serverEvent.setProtocolClassname(RAFT_PROTOCOL);
+            serverEvent.isClientProtocol(false);
+            serverEvent.isProtocolActivation(true);
+            
+            VSTask task = new VSTask(0, viz.getProcess(i), serverEvent, false);
+            taskManager.addTask(task);
+        }
+        
+        // Add client activation (process 2)
+        VSProtocolEvent clientEvent = new VSProtocolEvent();
+        clientEvent.setProtocolClassname(RAFT_PROTOCOL);
+        clientEvent.isClientProtocol(true);
+        clientEvent.isProtocolActivation(true);
+        
+        VSTask clientTask = new VSTask(100, viz.getProcess(2), clientEvent, false);
+        taskManager.addTask(clientTask);
+        
+        // Save
+        File outputFile = new File("saved-simulations/raft-consensus.dat");
+        outputFile.getParentFile().mkdirs();
+        
+        VSSerialize serialize = new VSSerialize();
+        serialize.saveSimulator(outputFile.getAbsolutePath(), simulator);
+        
+        frame.dispose();
+        
+        System.out.println("Raft simulation created: " + outputFile.getAbsolutePath());
+        System.out.println("\nContains:");
+        System.out.println("- 2 Raft servers (processes 0-1)");
+        System.out.println("- 1 Raft client (process 2)");
+        System.out.println("\nRun with: java -jar target/ds-sim-1.0.1-SNAPSHOT.jar");
+        System.out.println("Then open: " + outputFile.getName());
+        
+        System.exit(0);
+    }
+}
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