所有超级接口:
HandlerMethodReturnValueHandler
所有已知实现类:
AbstractAsyncReturnValueHandler, CompletableFutureReturnValueHandler, HandlerMethodReturnValueHandlerComposite, ListenableFutureReturnValueHandler, ReactiveReturnValueHandler
```
public interface AsyncHandlerMethodReturnValueHandler
extends HandlerMethodReturnValueHandler
```
An extension of HandlerMethodReturnValueHandler for handling async, Future-like return value types that support success and error callbacks. Essentially anything that can be adapted to a ListenableFuture.
Implementations should consider extending the convenient base class AbstractAsyncReturnValueHandler.
从以下版本开始:
4.2
作者:
Rossen Stoyanchev
另请参阅:
AbstractAsyncReturnValueHandler

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`boolean`	`isAsyncReturnValue(Object returnValue, MethodParameter returnType)`	Whether the return value represents an asynchronous, Future-like type with success and error callbacks.
`ListenableFuture<?>`	`toListenableFuture(Object returnValue, MethodParameter returnType)`	Adapt the asynchronous return value to a `ListenableFuture`.

从接口继承的方法 org.springframework.messaging.handler.invocation.HandlerMethodReturnValueHandler
handleReturnValue, supportsReturnType

- 方法详细资料
  - isAsyncReturnValue
```
boolean isAsyncReturnValue(Object returnValue,
                           MethodParameter returnType)
```
    Whether the return value represents an asynchronous, Future-like type with success and error callbacks. If this method returns true, then toListenableFuture(java.lang.Object, org.springframework.core.MethodParameter) is invoked next. If it returns false, then HandlerMethodReturnValueHandler.handleReturnValue(java.lang.Object, org.springframework.core.MethodParameter, org.springframework.messaging.Message<?>) is called.
    Note: this method will only be invoked after HandlerMethodReturnValueHandler.supportsReturnType(org.springframework.core.MethodParameter) is called and it returns true.
    参数:
    returnValue - the value returned from the handler method
    returnType - the type of the return value
    返回:
    true if the return value type represents an async value
  - toListenableFuture
```
@Nullable
ListenableFuture<?> toListenableFuture(Object returnValue,
                                       MethodParameter returnType)
```
    Adapt the asynchronous return value to a ListenableFuture. Implementations should consider returning an instance of SettableListenableFuture. Return value handling will then continue when the ListenableFuture is completed with either success or error.
    Note: this method will only be invoked after HandlerMethodReturnValueHandler.supportsReturnType(org.springframework.core.MethodParameter) is called and it returns true.
    参数:
    returnValue - the value returned from the handler method
    returnType - the type of the return value
    返回:
    the resulting ListenableFuture, or null in which case no further handling will be performed

接口 AsyncHandlerMethodReturnValueHandler

方法概要

从接口继承的方法 org.springframework.messaging.handler.invocation.HandlerMethodReturnValueHandler

方法详细资料

isAsyncReturnValue

toListenableFuture