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package core;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import events.implementations.VSProcessCrashEvent;
import events.implementations.VSProcessRecoverEvent;
import simulator.VSSimulator;
import simulator.VSSimulatorVisualization;
import simulator.builder.SimulationBuilder;
import testing.HeadlessLoader;
class VSTaskManagerCrashRecoveryIntegrationTest {
private static final long ADVANCE_STEP_MS = 1L;
private VSSimulator simulatorToStop;
private VSSimulator loadedSimulatorToStop;
@AfterEach
void tearDown() {
stopSimulatorThread(simulatorToStop);
stopSimulatorThread(loadedSimulatorToStop);
}
@Test
@DisplayName("Runtime supports recover then later crash of a different process")
void runtimeSupportsRecoverThenCrashAnotherProcess() throws Exception {
VSSimulator simulator = new SimulationBuilder()
.withProcesses(3)
.withDuration(1000)
.getSimulator();
simulatorToStop = simulator;
VSSimulatorVisualization visualization = simulator.getSimulatorCanvas();
VSInternalProcess process0 = visualization.getProcess(0);
VSInternalProcess process1 = visualization.getProcess(1);
VSTaskManager taskManager = visualization.getTaskManager();
taskManager.addTask(new VSTask(5, process0, new VSProcessCrashEvent(), VSTask.GLOBAL));
taskManager.addTask(new VSTask(10, process0, new VSProcessRecoverEvent(), VSTask.GLOBAL));
taskManager.addTask(new VSTask(15, process1, new VSProcessCrashEvent(), VSTask.GLOBAL));
runUntil(visualization, 20);
assertFalse(process0.isCrashed(), "process 0 should have recovered");
assertTrue(process1.isCrashed(), "process 1 should crash after process 0 recovers");
}
@Test
@DisplayName("Saved replay preserves recover then later crash of another process")
void savedReplayPreservesRecoverThenCrashAnotherProcess() throws Exception {
Path datFile = Files.createTempFile("crash-recover-replay", ".dat");
VSSimulator builtSimulator = new SimulationBuilder()
.withProcesses(3)
.withDuration(1000)
.addCrashEvent(0, 5)
.addRecoveryEvent(0, 10)
.addCrashEvent(1, 15)
.save(datFile.toString())
.getSimulator();
simulatorToStop = builtSimulator;
HeadlessLoader.LoadedSimulation loaded =
HeadlessLoader.load(datFile.toString(), builtSimulator.getPrefs());
loadedSimulatorToStop = loaded.getSimulator();
VSSimulatorVisualization visualization = loaded.getVisualization();
assertFalse(visualization.getProcess(0).isCrashed(),
"process 0 should start alive after replay load");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should start alive after replay load");
runUntil(visualization, 4);
assertFalse(visualization.getProcess(0).isCrashed(),
"process 0 should stay alive before its crash point");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should stay alive before process 0 crashes");
runUntil(visualization, 6);
assertTrue(visualization.getProcess(0).isCrashed(),
"process 0 should crash immediately after its scheduled crash point");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should still be alive while process 0 is crashed");
runUntil(visualization, 10);
assertTrue(visualization.getProcess(0).isCrashed(),
"process 0 should remain crashed before its recover point");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should still be alive before its later crash");
runUntil(visualization, 11);
assertFalse(visualization.getProcess(0).isCrashed(),
"process 0 should recover immediately after its scheduled recover point");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should still be alive before its crash point");
runUntil(visualization, 15);
assertFalse(visualization.getProcess(0).isCrashed(),
"process 0 should stay recovered before process 1 crashes");
assertFalse(visualization.getProcess(1).isCrashed(),
"process 1 should stay alive before its later crash point");
runUntil(visualization, 16);
assertFalse(visualization.getProcess(0).isCrashed(),
"process 0 should remain recovered after replay load");
assertTrue(visualization.getProcess(1).isCrashed(),
"process 1 should crash immediately after its later replay point");
}
@Test
@DisplayName("Live GUI-style event injection supports recover and later crash")
void liveEventInjectionSupportsRecoverAndLaterCrash() throws Exception {
VSSimulator simulator = new SimulationBuilder()
.withProcesses(3)
.withDuration(1000)
.getSimulator();
simulatorToStop = simulator;
VSSimulatorVisualization visualization = simulator.getSimulatorCanvas();
VSInternalProcess process0 = visualization.getProcess(0);
VSInternalProcess process1 = visualization.getProcess(1);
VSTaskManager taskManager = visualization.getTaskManager();
runUntil(visualization, 5);
taskManager.addTask(new VSTask(process0.getGlobalTime(), process0,
new VSProcessCrashEvent(), VSTask.GLOBAL));
runUntil(visualization, 6);
assertTrue(process0.isCrashed(), "process 0 should crash from live event");
taskManager.addTask(new VSTask(process0.getGlobalTime(), process0,
new VSProcessRecoverEvent(), VSTask.GLOBAL));
runUntil(visualization, 7);
assertFalse(process0.isCrashed(), "process 0 should recover from live event");
taskManager.addTask(new VSTask(process1.getGlobalTime(), process1,
new VSProcessCrashEvent(), VSTask.GLOBAL));
runUntil(visualization, 8);
assertTrue(process1.isCrashed(), "process 1 should crash after process 0 recovers");
}
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 + ADVANCE_STEP_MS;
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);
}
private void stopSimulatorThread(VSSimulator simulator) {
if (simulator != null) {
simulator.getSimulatorCanvas().stopThread();
}
}
}
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