Spring 异步请求
Spring 异步请求
官方文档 Asynchronous Request Processing
Servlet3.0
- A
ServletRequest
can be put in asynchronous mode by callingrequest.startAsync()
. The main effect of doing so is that the Servlet, as well as any Filters, can exit but the response will remain open to allow processing to complete later. - The call to
request.startAsync()
returnsAsyncContext
which can be used for further control over async processing. For example it provides the method dispatch, that is similar to a forward from the Servlet API except it allows an application to resume request processing on a Servlet container thread. - The
ServletRequest
provides access to the currentDispatcherType
that can be used to distinguish between processing the initial request, an async dispatch, a forward, and other dispatcher types.
Callable
With the above in mind, the following is the sequence of events for async request processing with a Callable:
- Controller returns a
Callable
. - Spring MVC starts asynchronous processing and submits the
Callable
to aTaskExecutor
for processing in a separate thread. - The
DispatcherServlet
and all Filter’s exit the Servlet container thread but the response remains open. - The
Callable
produces a result and Spring MVC dispatches the request back to the Servlet container to resume processing. - The
DispatcherServlet
is invoked again and processing resumes with the asynchronously produced result from theCallable
.
DeferredResult
The sequence for DeferredResult
is very similar except it’s up to the application to produce the asynchronous result from any thread:
- Controller returns a
DeferredResult
and saves it in some in-memory queue or list where it can be accessed. - Spring MVC starts async processing.
- The
DispatcherServlet
and all configured Filter’s exit the request processing thread but the response remains open. - The application sets the
DeferredResult
from some thread and Spring MVC dispatches the request back to the Servlet container. - The
DispatcherServlet
is invoked again and processing resumes with the asynchronously produced result.
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