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Allow auto-configured applicationTaskExecutor to use virtual threads

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With this commit, when virtual threads are enabled, the auto-configured
applicationTaskExecutor changes from a ThreadPoolTaskExecutor to a
SimpleAsyncTaskExecutor with virtual threads enabled.

As before, any TaskDecorator bean is applied to the auto-configured
executor and the spring.task.execution.thread-name-prefix property is
applied. Other spring.task.execution.* properties are ignored as they
are specific to a pool-based executor.

Closes gh-35710
This commit is contained in:
Andy Wilkinson
2023-07-17 09:47:54 +01:00
parent 783bfb62e2
commit f33874e98e
4 changed files with 157 additions and 3 deletions
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7
spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/task-execution-and-scheduling.adoc
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@@ -1,6 +1,9 @@
[[features.task-execution-and-scheduling]]
== Task Execution and Scheduling
In the absence of an `Executor` bean in the context, Spring Boot auto-configures a `ThreadPoolTaskExecutor` with sensible defaults that can be automatically associated to asynchronous task execution (`@EnableAsync`) and Spring MVC asynchronous request processing.
In the absence of an `Executor` bean in the context, Spring Boot auto-configures an `AsyncTaskExecutor`.
When virtual threads are enabled (using Java 21+ and configprop:spring.threads.virtual.enabled[] set to `true`) this will be a `SimpleAsyncTaskExecutor` that uses virtual threads.
Otherwise, it will be a `ThreadPoolTaskExecutor` with sensible defaults.
In either case, the auto-configured executor will be automatically used for asynchronous task execution (`@EnableAsync`) and Spring MVC asynchronous request processing.
[TIP]
====
@@ -10,7 +13,7 @@ Depending on your target arrangement, you could change your `Executor` into a `T
The auto-configured `TaskExecutorBuilder` allows you to easily create instances that reproduce what the auto-configuration does by default.
====
The thread pool uses 8 core threads that can grow and shrink according to the load.
When a `ThreadPoolTaskExecutor` is auto-configured, the thread pool uses 8 core threads that can grow and shrink according to the load.
Those default settings can be fine-tuned using the `spring.task.execution` namespace, as shown in the following example:
[source,yaml,indent=0,subs="verbatim",configprops,configblocks]