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GH-8626: Provide cleaner transform() DSL (#8653)

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* GH-8626: Provide cleaner `transform()` DSL

Fixes https://github.com/spring-projects/spring-integration/issues/8626

* Add missed `transform(String beanName, @Nullable String methodName)` API
* Introduce a `TransformerSpec` to expose a strict API to configure
transformer variants.
* Introduce `transformWith(Consumer<TransformerSpec>)` as a single point
of all possible transformer and its endpoint options
* Deprecate those `IntegrationFlowDefinition.transform()` variants
which are harder to configure as several lambda arguments

This change will make Kotlin & Groovy DSL more readable and straightforward

* * Use new `transformWith()` in tests where a deprecated API still used
* Add JavaDocs to `TransformerSpec`
* Fix generic types for `BaseIntegrationFlowDefinition.transformWith()` -
they make sense exactly on the `TransformerSpec.transformer()` only
* Apply `transformWith()` for Groovy DSL
* Introduce a new `ClassUtils.isLambda(Object candidate)`
and add a check for Groovy `Closure`
* Fix `GroovyIntegrationFlowDefinition.createConfigurerIfAny()` to propagate a `Consumer` argument
down to the `Closure`

* * Rename `TransformerSpec -> TransformerEndpointSpec` for better context
meaning of the class
* Introduce `KotlinTransformerEndpointSpec` as an extension of the `TransformerEndpointSpec`
to have an `inline fun <reified P> transformer(crossinline function: (P) -> Any)`
for Kotlin style
* Add `KotlinIntegrationFlowDefinition.transformWith(KotlinTransformerEndpointSpec)`
* Deprecate Kotlin methods which are covered by the mentioned `transformWith()`
* Fix tests to use new API
* Mentioned the change in the doc
This commit is contained in:
Artem Bilan
2023-06-26 12:01:13 -04:00
committed by GitHub
parent ceb3daec8e
commit 070c1c6e60
20 changed files with 593 additions and 61 deletions
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5
spring-integration-file/src/test/java/org/springframework/integration/file/dsl/FileTests.java
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@@ -448,8 +448,9 @@ public class FileTests {
.from(Files.inboundAdapter(directory).recursive(true),
e -> e.poller(p -> p.fixedDelay(1000))
.id(directory.getName() + ".adapter"))
.transform(Files.toStringTransformer(),
e -> e.id(directory.getName() + ".transformer"))
.transformWith(t -> t
.transformer(Files.toStringTransformer())
.id(directory.getName() + ".transformer"))
.channel(this.dynamicAdaptersResult)
.get();
this.beanFactory.initializeBean(integrationFlow, directory.getName());