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Reintroduce BinderHeaderMapper (#797)

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* Reintrouce BinderHeaderMapper

Provide a  custom header mapper that is identical to the DefaultKafkaHeaderMapper in Spring Kafka.
This is to address some interoperability issues between Spring Cloud Stream 3.0.x and 2.x apps,
where mime types in the header are not de-serialized properly. This custom BinderHeaderMapper
will be eventually deprecated and removed once the fixes are in Spring Kafka.

Resolves #796

* Addressing review

* polishing
This commit is contained in:
Soby Chacko
2019-11-06 21:14:20 -05:00
committed by Gary Russell
parent 65386f6967
commit ac6bdc976e
4 changed files with 475 additions and 8 deletions
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4
docs/src/main/asciidoc/overview.adoc
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@@ -135,8 +135,8 @@ Default: See individual producer properties.
spring.cloud.stream.kafka.binder.headerMapperBeanName::
The bean name of a `KafkaHeaderMapper` used for mapping `spring-messaging` headers to and from Kafka headers.
Use this, for example, if you wish to customize the trusted packages in a `DefaultKafkaHeaderMapper` that uses JSON deserialization for the headers.
If this custom `KafkaHeaderMapper` bean is not made available to the binder using this property, then the binder will look for a header mapper bean with the name `kafkaBinderHeaderMapper` before falling back to a default header mapper.
Use this, for example, if you wish to customize the trusted packages in a `BinderHeaderMapper` bean that uses JSON deserialization for the headers.
If this custom `BinderHeaderMapper` bean is not made available to the binder using this property, then the binder will look for a header mapper bean with the name `kafkaBinderHeaderMapper` that is of type `BinderHeaderMapper` before falling back to a default `BinderHeaderMapper` created by the binder.
+
Default: none.