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package simulator.builder;
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.io.File;
import java.nio.file.*;
import java.nio.charset.StandardCharsets;
import core.VSInternalProcess;
import simulator.VSSimulator;
import simulator.VSSimulatorVisualization;
import testing.HeadlessLoader;
/**
* Tests for the SimulationBuilder framework
*/
class SimulationBuilderTest {
private static final String TEST_DIR = "target/test-simulations/";
@BeforeEach
void setUp() throws Exception {
// Create test directory
Files.createDirectories(Paths.get(TEST_DIR));
}
@AfterEach
void tearDown() throws Exception {
// Clean up test files
File dir = new File(TEST_DIR);
if (dir.exists()) {
for (File file : dir.listFiles()) {
file.delete();
}
}
}
@Test
void testCreatePingPongSimulation() throws Exception {
String filename = TEST_DIR + "test-pingpong.dat";
SimulationFactory.createPingPongSimulation(2)
.save(filename);
File file = new File(filename);
assertTrue(file.exists(), "Simulation file should be created");
String content = new String(Files.readAllBytes(file.toPath()),
StandardCharsets.ISO_8859_1);
assertTrue(content.contains("VSPingPongProtocol"), "Should contain PingPong protocol");
}
@Test
void testCreateComplexSimulation() throws Exception {
String filename = TEST_DIR + "test-complex.dat";
// Create a complex simulation with events
new SimulationBuilder()
.withProcesses(5)
.withProtocol(SimulationBuilder.Protocols.TWO_PHASE_COMMIT)
.withDuration(30000)
.activateServers(0, 1, 2)
.activateClientsAt(1000, 3, 4)
.addCrashEvent(0, 5000)
.addRecoveryEvent(0, 10000)
.save(filename);
File file = new File(filename);
assertTrue(file.exists(), "Simulation file should be created");
assertTrue(file.length() > 5000, "Complex simulation should be larger");
String content = new String(Files.readAllBytes(file.toPath()),
StandardCharsets.ISO_8859_1);
assertTrue(content.contains("VSProcessCrashEvent"), "Should contain crash event");
assertTrue(content.contains("VSProcessRecoverEvent"), "Should contain recovery event");
}
@Test
void testCreateRaftSimulation() throws Exception {
String filename = TEST_DIR + "test-raft.dat";
SimulationBuilder builder = SimulationFactory.createRaftSimulation();
VSSimulator simulator = builder.save(filename).getSimulator();
File file = new File(filename);
assertTrue(file.exists(), "Simulation file should be created");
assertTrue(file.length() > 10000, "Raft simulation should be larger");
assertEquals(60, builder.getSimulator().getPrefs().getInteger("sim.seconds"),
"Raft simulation should replay for 60 seconds");
String content = new String(Files.readAllBytes(file.toPath()),
StandardCharsets.ISO_8859_1);
assertTrue(content.contains("VSRaftProtocol"), "Should contain Raft protocol");
assertTrue(content.contains("VSProcessCrashEvent"), "Should contain crash event");
assertTrue(content.contains("VSProcessRecoverEvent"), "Should contain recovery event");
assertTrue(countOccurrences(content, "VSProcessCrashEvent") >= 2,
"Should contain two crash events for different processes");
HeadlessLoader.LoadedSimulation loaded =
HeadlessLoader.load(filename, simulator.getPrefs());
VSSimulator loadedSimulator = loaded.getSimulator();
VSSimulatorVisualization visualization = loaded.getVisualization();
try {
VSInternalProcess process0 = visualization.getProcess(0);
VSInternalProcess process2 = visualization.getProcess(2);
runUntil(visualization, 3499);
assertFalse(process0.isCrashed(), "leader should stay alive before 3500ms");
assertFalse(process2.isCrashed(), "process 2 should stay alive before 3500ms");
runUntil(visualization, 3501);
assertTrue(process0.isCrashed(), "leader should crash immediately after 3500ms");
assertFalse(process2.isCrashed(), "process 2 should still be alive after leader crash");
runUntil(visualization, 12000);
assertTrue(process0.isCrashed(), "leader should remain crashed before 12000ms recovery executes");
assertFalse(process2.isCrashed(), "process 2 should stay alive before 20000ms");
runUntil(visualization, 12001);
assertFalse(process0.isCrashed(), "leader should recover immediately after 12000ms");
assertFalse(process2.isCrashed(), "process 2 should still be alive after leader recovery");
runUntil(visualization, 20000);
assertFalse(process0.isCrashed(), "leader should remain recovered before 20000ms crash executes");
assertFalse(process2.isCrashed(), "process 2 should stay alive before its crash point");
runUntil(visualization, 20001);
assertFalse(process0.isCrashed(), "leader should remain recovered at 20000ms");
assertTrue(process2.isCrashed(), "process 2 should crash immediately after 20000ms");
} finally {
loadedSimulator.getSimulatorCanvas().stopThread();
simulator.getSimulatorCanvas().stopThread();
}
}
@Test
void testAllProtocolTypes() throws Exception {
// Test that all protocol constants work
String[] protocols = {
SimulationBuilder.Protocols.PING_PONG,
SimulationBuilder.Protocols.BERKLEY_TIME,
SimulationBuilder.Protocols.BROADCAST,
SimulationBuilder.Protocols.ONE_PHASE_COMMIT,
SimulationBuilder.Protocols.TWO_PHASE_COMMIT,
SimulationBuilder.Protocols.RELIABLE_MULTICAST
};
for (String protocol : protocols) {
String filename = TEST_DIR + "test-" + protocol.substring(protocol.lastIndexOf('.') + 1) + ".dat";
new SimulationBuilder()
.withProcesses(3)
.withProtocol(protocol)
.activateServers(0, 1, 2)
.save(filename);
File file = new File(filename);
assertTrue(file.exists(), "Should create file for " + protocol);
assertTrue(file.length() > 1000, "File should have content for " + protocol);
}
}
@Test
void testInvalidConfiguration() {
// Test that invalid configurations throw exceptions
assertThrows(IllegalArgumentException.class, () -> {
SimulationFactory.createBerkeleyTimeSimulation(1); // Too few processes
});
}
private int countOccurrences(String content, String needle) {
int count = 0;
int index = 0;
while ((index = content.indexOf(needle, index)) != -1) {
count++;
index += needle.length();
}
return count;
}
private void runUntil(VSSimulatorVisualization visualization, long targetTime)
throws Exception {
setBooleanField(visualization, "isPaused", false);
setBooleanField(visualization, "hasFinished", false);
setDoubleField(visualization, "clockSpeed", 1.0d);
Method updateSimulator = VSSimulatorVisualization.class.getDeclaredMethod(
"updateSimulator", long.class, long.class);
updateSimulator.setAccessible(true);
long wallTime = visualization.getTime();
while (visualization.getTime() < targetTime) {
long nextWallTime = wallTime + 1L;
updateSimulator.invoke(visualization, nextWallTime, wallTime);
wallTime = nextWallTime;
}
}
private void setBooleanField(Object target, String fieldName, boolean value)
throws Exception {
Field field = target.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
field.setBoolean(target, value);
}
private void setDoubleField(Object target, String fieldName, double value)
throws Exception {
Field field = target.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
field.setDouble(target, value);
}
}
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