Add async task execution cleanup

Adds the ability to configure the system to run task executions cleanup
asynchronously.

Fixes #5408

spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DataflowAsyncConfiguration.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2016-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.dataflow.server.config;
+
+import java.util.concurrent.Executor;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.task.TaskExecutorBuilder;
+import org.springframework.cloud.dataflow.core.DataFlowPropertyKeys;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.AsyncConfigurer;
+import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+import static org.springframework.cloud.dataflow.server.config.DataflowAsyncConfiguration.ASYNC_PREFIX;
+
+/**
+ * Class to override the executor at the application level. It also enables async executions for the Spring Cloud Data Flow Server.
+ *
+ * @author Tobias Soloschenko
+ */
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnProperty(prefix = ASYNC_PREFIX, name = "enabled")
+@EnableAsync
+class DataflowAsyncConfiguration implements AsyncConfigurer {
+
+	private static final Logger logger = LoggerFactory.getLogger(DataflowAsyncConfiguration.class);
+
+	public static final String ASYNC_PREFIX = DataFlowPropertyKeys.PREFIX + "async";
+
+	private static final String THREAD_NAME_PREFIX = "scdf-async-";
+
+	@Bean(name = "asyncExecutor")
+	Executor getAsyncExecutor(TaskExecutorBuilder taskExecutorBuilder) {
+		return taskExecutorBuilder.threadNamePrefix(THREAD_NAME_PREFIX).build();
+	}
+
+	@Override
+	public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
+		return (throwable, method, objects) -> logger.error("Exception thrown in @Async Method " + method.getName(),
+				throwable);
+	}
+}

spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionController.java

@@ -68,6 +68,7 @@
 import org.springframework.hateoas.server.ExposesResourceFor;
 import org.springframework.hateoas.server.mvc.RepresentationModelAssemblerSupport;
 import org.springframework.http.HttpStatus;
+import org.springframework.scheduling.annotation.Async;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -344,6 +345,7 @@ public void cleanup(
 	 */
 	@RequestMapping(method = RequestMethod.DELETE)
 	@ResponseStatus(HttpStatus.OK)
+	@Async
 	public void cleanupAll(
 			@RequestParam(defaultValue = "CLEANUP", name = "action") TaskExecutionControllerDeleteAction[] actions,
 			@RequestParam(defaultValue = "false", name = "completed") boolean completed,

spring-cloud-dataflow-server-core/src/main/resources/META-INF/spring.factories

@@ -5,7 +5,8 @@ org.springframework.boot.env.EnvironmentPostProcessor=\
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
   org.springframework.cloud.dataflow.server.config.DataFlowServerAutoConfiguration,\
   org.springframework.cloud.dataflow.server.config.DataFlowControllerAutoConfiguration, \
-  org.springframework.cloud.dataflow.server.config.SpringDocAutoConfiguration
+  org.springframework.cloud.dataflow.server.config.SpringDocAutoConfiguration, \
+  org.springframework.cloud.dataflow.server.config.DataflowAsyncConfiguration
 
 org.springframework.context.ApplicationContextInitializer=\
   org.springframework.cloud.dataflow.common.flyway.FlywayVendorReplacingApplicationContextInitializer