Class AbstractEncoderMethodReturnValueHandler

All Implemented Interfaces:
Direct Known Subclasses:

public abstract class AbstractEncoderMethodReturnValueHandler extends Object implements HandlerMethodReturnValueHandler
Base class for a return value handler that encodes return values to Flux<DataBuffer> through the configured Encoders.

Subclasses must implement the abstract method handleEncodedContent(reactor.core.publisher.Flux<>, org.springframework.core.MethodParameter, org.springframework.messaging.Message<?>) to handle the resulting encoded content.

This handler should be ordered last since its supportsReturnType(org.springframework.core.MethodParameter) returns true for any method parameter type.

Rossen Stoyanchev
  • Field Details

    • logger

      protected final Log logger
  • Constructor Details

  • Method Details

    • getEncoders

      public List<Encoder<?>> getEncoders()
      The configured encoders.
    • getAdapterRegistry

      public ReactiveAdapterRegistry getAdapterRegistry()
      The configured adapter registry.
    • supportsReturnType

      public boolean supportsReturnType(MethodParameter returnType)
      Description copied from interface: HandlerMethodReturnValueHandler
      Whether the given method return type is supported by this handler.
      Specified by:
      supportsReturnType in interface HandlerMethodReturnValueHandler
      returnType - the method return type to check
      true if this handler supports the supplied return type; false otherwise
    • handleReturnValue

      public reactor.core.publisher.Mono<Void> handleReturnValue(@Nullable Object returnValue, MethodParameter returnType, Message<?> message)
      Description copied from interface: HandlerMethodReturnValueHandler
      Handle the given return value.
      Specified by:
      handleReturnValue in interface HandlerMethodReturnValueHandler
      returnValue - the value returned from the handler method
      returnType - the type of the return value. This type must have previously been passed to HandlerMethodReturnValueHandler.supportsReturnType(MethodParameter) and it must have returned true.
      Mono<Void> to indicate when handling is complete.
    • handleEncodedContent

      protected abstract reactor.core.publisher.Mono<Void> handleEncodedContent(reactor.core.publisher.Flux<DataBuffer> encodedContent, MethodParameter returnType, Message<?> message)
      Subclasses implement this method to handle encoded values in some way such as creating and sending messages.
      encodedContent - the encoded content; each DataBuffer represents the fully-aggregated, encoded content for one value (i.e. payload) returned from the HandlerMethod.
      returnType - return type of the handler method that produced the data
      message - the input message handled by the handler method
      completion Mono<Void> for the handling
    • handleNoContent

      protected abstract reactor.core.publisher.Mono<Void> handleNoContent(MethodParameter returnType, Message<?> message)
      Invoked for a null return value, which could mean a void method or method returning an async type parameterized by void.
      returnType - return type of the handler method that produced the data
      message - the input message handled by the handler method
      completion Mono<Void> for the handling