Merge pull request #47244 from quaff

* pr/47244:
  Polish contribution
  Add support for SimpleTaskExecutor#cancel-remaining-tasks-on-close

Closes gh-47244

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/task/TaskExecutionProperties.java

@@ -79,6 +79,12 @@ public class TaskExecutionProperties {
 
 	public static class Simple {
 
+		/**
+		 * Whether to cancel remaining tasks on close. Only recommended if threads are
+		 * commonly expected to be stuck.
+		 */
+		private boolean cancelRemainingTasksOnClose;
+
 		/**
 		 * Whether to reject tasks when the concurrency limit has been reached.
 		 */
@@ -90,6 +96,14 @@ public class TaskExecutionProperties {
 		 */
 		private @Nullable Integer concurrencyLimit;
 
+		public boolean isCancelRemainingTasksOnClose() {
+			return this.cancelRemainingTasksOnClose;
+		}
+
+		public void setCancelRemainingTasksOnClose(boolean cancelRemainingTasksOnClose) {
+			this.cancelRemainingTasksOnClose = cancelRemainingTasksOnClose;
+		}
+
 		public boolean isRejectTasksWhenLimitReached() {
 			return this.rejectTasksWhenLimitReached;
 		}

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/task/TaskExecutorConfigurations.java

@@ -148,6 +148,7 @@ class TaskExecutorConfigurations {
 			builder = builder.customizers(this.taskExecutorCustomizers.orderedStream()::iterator);
 			builder = builder.taskDecorator(getTaskDecorator(this.taskDecorator));
 			TaskExecutionProperties.Simple simple = this.properties.getSimple();
+			builder = builder.cancelRemainingTasksOnClose(simple.isCancelRemainingTasksOnClose());
 			builder = builder.rejectTasksWhenLimitReached(simple.isRejectTasksWhenLimitReached());
 			builder = builder.concurrencyLimit(simple.getConcurrencyLimit());
 			TaskExecutionProperties.Shutdown shutdown = this.properties.getShutdown();

core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/task/TaskExecutionAutoConfigurationTests.java

@@ -83,11 +83,13 @@ class TaskExecutionAutoConfigurationTests {
 	void simpleAsyncTaskExecutorBuilderShouldReadProperties() {
 		this.contextRunner
 			.withPropertyValues("spring.task.execution.thread-name-prefix=mytest-",
+					"spring.task.execution.simple.cancel-remaining-tasks-on-close=true",
 					"spring.task.execution.simple.reject-tasks-when-limit-reached=true",
 					"spring.task.execution.simple.concurrency-limit=1",
 					"spring.task.execution.shutdown.await-termination=true",
 					"spring.task.execution.shutdown.await-termination-period=30s")
 			.run(assertSimpleAsyncTaskExecutor((taskExecutor) -> {
+				assertThat(taskExecutor).hasFieldOrPropertyWithValue("cancelRemainingTasksOnClose", true);
 				assertThat(taskExecutor).hasFieldOrPropertyWithValue("rejectTasksWhenLimitReached", true);
 				assertThat(taskExecutor.getConcurrencyLimit()).isEqualTo(1);
 				assertThat(taskExecutor.getThreadNamePrefix()).isEqualTo("mytest-");

core/spring-boot/src/main/java/org/springframework/boot/task/SimpleAsyncTaskExecutorBuilder.java

@@ -52,6 +52,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 
 	private final @Nullable String threadNamePrefix;
 
+	private final boolean cancelRemainingTasksOnClose;
+
 	private final boolean rejectTasksWhenLimitReached;
 
 	private final @Nullable Integer concurrencyLimit;
@@ -63,15 +65,16 @@ public class SimpleAsyncTaskExecutorBuilder {
 	private final @Nullable Duration taskTerminationTimeout;
 
 	public SimpleAsyncTaskExecutorBuilder() {
-		this(null, null, false, null, null, null, null);
+		this(null, null, false, false, null, null, null, null);
 	}
 
 	private SimpleAsyncTaskExecutorBuilder(@Nullable Boolean virtualThreads, @Nullable String threadNamePrefix,
-			boolean rejectTasksWhenLimitReached, @Nullable Integer concurrencyLimit,
+			boolean cancelRemainingTasksOnClose, boolean rejectTasksWhenLimitReached,
-			@Nullable TaskDecorator taskDecorator, @Nullable Set<SimpleAsyncTaskExecutorCustomizer> customizers,
+			@Nullable Integer concurrencyLimit, @Nullable TaskDecorator taskDecorator,
-			@Nullable Duration taskTerminationTimeout) {
+			@Nullable Set<SimpleAsyncTaskExecutorCustomizer> customizers, @Nullable Duration taskTerminationTimeout) {
 		this.virtualThreads = virtualThreads;
 		this.threadNamePrefix = threadNamePrefix;
+		this.cancelRemainingTasksOnClose = cancelRemainingTasksOnClose;
 		this.rejectTasksWhenLimitReached = rejectTasksWhenLimitReached;
 		this.concurrencyLimit = concurrencyLimit;
 		this.taskDecorator = taskDecorator;
@@ -86,8 +89,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder threadNamePrefix(@Nullable String threadNamePrefix) {
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				this.taskTerminationTimeout);
+				this.taskDecorator, this.customizers, this.taskTerminationTimeout);
 	}
 
 	/**
@@ -97,8 +100,26 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder virtualThreads(@Nullable Boolean virtualThreads) {
 		return new SimpleAsyncTaskExecutorBuilder(virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				this.taskTerminationTimeout);
+				this.taskDecorator, this.customizers, this.taskTerminationTimeout);
+	}
+
+	/**
+	 * Set whether to cancel remaining tasks on close. By default {@code false} not
+	 * tracking active threads at all or just interrupting any remaining threads that
+	 * still have not finished after the specified {@link #taskTerminationTimeout
+	 * taskTerminationTimeout}. Switch this to {@code true} for immediate interruption on
+	 * close, either in combination with a subsequent termination timeout or without any
+	 * waiting at all, depending on whether a {@code taskTerminationTimeout} has been
+	 * specified as well.
+	 * @param cancelRemainingTasksOnClose whether to cancel remaining tasks on close
+	 * @return a new builder instance
+	 * @since 4.0.0
+	 */
+	public SimpleAsyncTaskExecutorBuilder cancelRemainingTasksOnClose(boolean cancelRemainingTasksOnClose) {
+		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
+				cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
+				this.taskDecorator, this.customizers, this.taskTerminationTimeout);
 	}
 
 	/**
@@ -112,8 +133,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder rejectTasksWhenLimitReached(boolean rejectTasksWhenLimitReached) {
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, rejectTasksWhenLimitReached, this.concurrencyLimit,
-				this.taskTerminationTimeout);
+				this.taskDecorator, this.customizers, this.taskTerminationTimeout);
 	}
 
 	/**
@@ -123,8 +144,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder concurrencyLimit(@Nullable Integer concurrencyLimit) {
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, concurrencyLimit, this.taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, concurrencyLimit,
-				this.taskTerminationTimeout);
+				this.taskDecorator, this.customizers, this.taskTerminationTimeout);
 	}
 
 	/**
@@ -134,8 +155,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder taskDecorator(@Nullable TaskDecorator taskDecorator) {
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				this.taskTerminationTimeout);
+				taskDecorator, this.customizers, this.taskTerminationTimeout);
 	}
 
 	/**
@@ -146,8 +167,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 	 */
 	public SimpleAsyncTaskExecutorBuilder taskTerminationTimeout(@Nullable Duration taskTerminationTimeout) {
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator, this.customizers,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				taskTerminationTimeout);
+				this.taskDecorator, this.customizers, taskTerminationTimeout);
 	}
 
 	/**
@@ -177,8 +198,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 			Iterable<? extends SimpleAsyncTaskExecutorCustomizer> customizers) {
 		Assert.notNull(customizers, "'customizers' must not be null");
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator, append(null, customizers),
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				this.taskTerminationTimeout);
+				this.taskDecorator, append(null, customizers), this.taskTerminationTimeout);
 	}
 
 	/**
@@ -206,8 +227,8 @@ public class SimpleAsyncTaskExecutorBuilder {
 			Iterable<? extends SimpleAsyncTaskExecutorCustomizer> customizers) {
 		Assert.notNull(customizers, "'customizers' must not be null");
 		return new SimpleAsyncTaskExecutorBuilder(this.virtualThreads, this.threadNamePrefix,
-				this.rejectTasksWhenLimitReached, this.concurrencyLimit, this.taskDecorator,
+				this.cancelRemainingTasksOnClose, this.rejectTasksWhenLimitReached, this.concurrencyLimit,
-				append(this.customizers, customizers), this.taskTerminationTimeout);
+				this.taskDecorator, append(this.customizers, customizers), this.taskTerminationTimeout);
 	}
 
 	/**
@@ -246,6 +267,7 @@ public class SimpleAsyncTaskExecutorBuilder {
 		PropertyMapper map = PropertyMapper.get();
 		map.from(this.virtualThreads).to(taskExecutor::setVirtualThreads);
 		map.from(this.threadNamePrefix).whenHasText().to(taskExecutor::setThreadNamePrefix);
+		map.from(this.cancelRemainingTasksOnClose).to(taskExecutor::setCancelRemainingTasksOnClose);
 		map.from(this.rejectTasksWhenLimitReached).to(taskExecutor::setRejectTasksWhenLimitReached);
 		map.from(this.concurrencyLimit).to(taskExecutor::setConcurrencyLimit);
 		map.from(this.taskDecorator).to(taskExecutor::setTaskDecorator);

core/spring-boot/src/test/java/org/springframework/boot/task/SimpleAsyncTaskExecutorBuilderTests.java

@@ -59,6 +59,12 @@ class SimpleAsyncTaskExecutorBuilderTests {
 		SimpleAsyncTaskExecutorAssert.assertThat(executor).usesVirtualThreads();
 	}
 
+	@Test
+	void cancelRemainingTasksOnCloseShouldApply() {
+		SimpleAsyncTaskExecutor executor = this.builder.cancelRemainingTasksOnClose(true).build();
+		assertThat(executor).extracting("cancelRemainingTasksOnClose").isEqualTo(true);
+	}
+
 	@Test
 	void rejectTasksWhenLimitReachedShouldApply() {
 		SimpleAsyncTaskExecutor executor = this.builder.rejectTasksWhenLimitReached(true).build();