HandlerMethodReturnValueHandler (Spring Framework 5.2.12.RELEASE API)

All Known Implementing Classes:
AbstractEncoderMethodReturnValueHandler, HandlerMethodReturnValueHandlerComposite, RSocketPayloadReturnValueHandler
```
public interface HandlerMethodReturnValueHandler
```
Handle the return value from the invocation of an annotated Message handling method.
Since:
5.2
Author:
Rossen Stoyanchev

Field Summary
Fields
Modifier and Type Field Description
static String DATA_BUFFER_FACTORY_HEADER
Header containing a DataBufferFactory for use in return value handling.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`reactor.core.publisher.Mono<Void>`	`handleReturnValue(Object returnValue, MethodParameter returnType, Message<?> message)`	Handle the given return value.
`boolean`	`supportsReturnType(MethodParameter returnType)`	Whether the given method return type is supported by this handler.

- Field Detail
  - DATA_BUFFER_FACTORY_HEADER
```
static final String DATA_BUFFER_FACTORY_HEADER
```
    Header containing a DataBufferFactory for use in return value handling.
    See Also:
    Constant Field Values
- Method Detail
  - supportsReturnType
```
boolean supportsReturnType(MethodParameter returnType)
```
    Whether the given method return type is supported by this handler.
    Parameters:
    returnType - the method return type to check
    Returns:
    true if this handler supports the supplied return type; false otherwise
  - handleReturnValue
```
reactor.core.publisher.Mono<Void> handleReturnValue(@Nullable
                                                    Object returnValue,
                                                    MethodParameter returnType,
                                                    Message<?> message)
```
    Handle the given return value.
    Parameters:
    returnValue - the value returned from the handler method
    returnType - the type of the return value. This type must have previously been passed to supportsReturnType(MethodParameter) and it must have returned true.
    Returns:
    Mono<Void> to indicate when handling is complete.