The enableasync annotation enables spring s ability to run async methods in a background thread pool. We want our threads to be managed by spring and thus be able to use the.
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This example needs no spring dependencies.
Spring background thread. By default the task thread is in a state to consume tasks based on the run atomic boolean. When a task thread is started it waits in loop till a task is assigned. Create a simple java thread by extending thread and managed by spring s container via component.
The method s return type is completablefuture user instead of user a requirement for any asynchronous service. You want thread start to run thread in background. In the below diagram this is shown as the outer loop.
The enableasync annotation switches on spring s ability to run async methods in a background thread pool. For all spring applications you should start with the spring initializr. The initializr offers a fast way to pull in all the dependencies you need for an application and does a lot of the setup for you.
The finduser method is flagged with spring s async annotation indicating that it should run on a separate thread. Taskscheuler was introduced in spring 3 0 with a variety of methods to run at some point in the future it also returns a representation object of scheduledfuture interface which could be used to cancel scheduled task or check if it s done or not. Thread run is going to execute the code in the thread s run method on the current thread.
This class also customizes the used executor in our case we want to limit the number. The bean scope must be prototype so that each request will return a new instance to run each individual thread. Spring boot itself provides all the spring packages that you need for this guide.
As long as this is true the thread is always running. If you want to read more about scheduling in spring check async and scheduled articles. The bean taskexecutor helps to customize the thread executor such as configuring the number.
Considering spring we must pay extra attention and use the tools it already provides instead of spawning our own threads.
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