JCStress: Await Scheduler dispose and increase timeouts (#3630)

Resolves #3626

Author: Dariusz Jędrzejczyk

reactor-core/src/jcstress/java/reactor/core/scheduler/BasicSchedulersStressTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 VMware Inc. or its affiliates, All Rights Reserved.
+ * Copyright (c) 2022-2023 VMware Inc. or its affiliates, All Rights Reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,6 @@
 import java.time.Duration;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicReference;
 
 import org.openjdk.jcstress.annotations.Actor;
 import org.openjdk.jcstress.annotations.Arbiter;
@@ -29,6 +28,7 @@
 import org.openjdk.jcstress.annotations.State;
 import org.openjdk.jcstress.infra.results.IIZ_Result;
 import org.openjdk.jcstress.infra.results.Z_Result;
+import reactor.core.Disposable;
 
 public abstract class BasicSchedulersStressTest {
 
@@ -43,11 +43,15 @@ private static boolean canScheduleTask(Scheduler scheduler) {
 		if (scheduler.isDisposed()) {
 			return false;
 		}
-		scheduler.schedule(latch::countDown);
+		Disposable disposable = scheduler.schedule(latch::countDown);
 		boolean taskDone = false;
 		try {
-			taskDone = latch.await(100, TimeUnit.MILLISECONDS);
-		} catch (InterruptedException ignored) {
+			taskDone = latch.await(1, TimeUnit.SECONDS);
+		} catch (InterruptedException ie) {
+			throw new RuntimeException(ie);
+		}
+		if (((SchedulerTask) disposable).future.isCancelled()) {
+			throw new RuntimeException("Future cancelled " + disposable);
 		}
 		return taskDone;
 	}
@@ -78,7 +82,7 @@ public void arbiter(Z_Result r) {
 			// At this stage, at least one actor called scheduler.start(),
 			// so we should be able to execute a task.
 			r.r1 = canScheduleTask(scheduler);
-			scheduler.dispose();
+			scheduler.disposeGracefully().block(Duration.ofMillis(500));
 		}
 	}
 
@@ -88,7 +92,7 @@ public void arbiter(Z_Result r) {
 	public static class ParallelSchedulerStartDisposeStressTest {
 
 		private final ParallelScheduler scheduler =
-				new ParallelScheduler(4, Thread::new);
+				new ParallelScheduler(2, Thread::new);
 
 		{
 			scheduler.init();
@@ -109,7 +113,7 @@ public void arbiter(Z_Result r) {
 			// At this stage, at least one actor called scheduler.start(),
 			// so we should be able to execute a task.
 			r.r1 = canScheduleTask(scheduler);
-			scheduler.dispose();
+			scheduler.disposeGracefully().block(Duration.ofMillis(500));;
 		}
 	}
 
@@ -169,7 +173,7 @@ public static class ParallelSchedulerDisposeGracefullyStressTest {
 
 		private final CountDownLatch latch = new CountDownLatch(2);
 		private final ParallelScheduler scheduler =
-				new ParallelScheduler(10, Thread::new);
+				new ParallelScheduler(2, Thread::new);
 
 		{
 			scheduler.init();
@@ -263,7 +267,7 @@ public void arbiter(IIZ_Result r) {
 	public static class ParallelSchedulerDisposeGracefullyAndDisposeStressTest {
 
 		private final ParallelScheduler scheduler =
-				new ParallelScheduler(10, Thread::new);
+				new ParallelScheduler(2, Thread::new);
 
 		{
 			scheduler.init();