org.springframework.web.method.support

Interface AsyncHandlerMethodReturnValueHandler

All Superinterfaces:

HandlerMethodReturnValueHandler

public interface AsyncHandlerMethodReturnValueHandler
extends HandlerMethodReturnValueHandler

A return value handler that supports async types. Such return value types need to be handled with priority so the async value can be "unwrapped".

Note: implementing this contract is not required but it should be implemented when the handler needs to be prioritized ahead of others. For example custom (async) handlers, by default ordered after built-in handlers, should take precedence over @ResponseBody or @ModelAttribute handling, which should occur once the async value is ready. By contrast, built-in (async) handlers are already ordered ahead of sync handlers.

Since:

4.2

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method and Description
boolean	isAsyncReturnValue(Object returnValue, MethodParameter returnType) Whether the given return value represents asynchronous computation.

Methods inherited from interface org.springframework.web.method.support.HandlerMethodReturnValueHandler

handleReturnValue, supportsReturnType

Method Detail

isAsyncReturnValue

boolean isAsyncReturnValue(@Nullable
                           Object returnValue,
                           MethodParameter returnType)

Whether the given return value represents asynchronous computation.

Parameters:

returnValue - the value returned from the handler method

returnType - the return type

Returns:

true if the return value type represents an async value