From c9d5ff5e3e3a66937f1e07c96939bc2088c382f8 Mon Sep 17 00:00:00 2001 From: buildmaster Date: Mon, 4 Nov 2019 14:56:06 +0000 Subject: [PATCH] Sync docs from master to gh-pages --- reference/html/spring-cloud-function.html | 42 +++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/reference/html/spring-cloud-function.html b/reference/html/spring-cloud-function.html index fef5680b0..b24627359 100644 --- a/reference/html/spring-cloud-function.html +++ b/reference/html/spring-cloud-function.html @@ -103,6 +103,7 @@ $(addBlockSwitches); @@ -486,6 +487,47 @@ completely.

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Function Composition

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Function Composition is a feature that allows one to compose several functions into one. +The core support is based on function composition feature available with Function.andThen(..) +support available since Java 8. However on top of it, we provide few additional features.

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Declarative Function Composition

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This feature allows you to provide composition instruction in a declarative way using | (pipe) or , (comma) delimiter +when providing spring.cloud.function.definition property.

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For example

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--spring.cloud.function.definition=uppercase|reverse
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Here we effectively provided a definition of a single function which itself is a composition of +function uppercase and function reverse. In fact that is one of the reasons why the property name is definition and not name, +since the definition of a function can be a composition of several named functions. +And as mentioned you can use , instead of pipe (such as …​definition=uppercase,reverse).

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Composing non-Functions

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Spring Cloud Function also supports composing Supplier with Consumer or Function as well as Function with Consumer. +What’s important here is to understand the end product of such definitions. +Composing Supplier with Function still results in Supplier while composing Supplier with Consumer will effectively render Runnable. +Following the same logic composing Function with Consumer will result in Consumer.

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And of course you can’t compose uncomposable such as Consumer and Function, Consumer and Supplier etc.

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Function Routing

Since version 2.2 Spring Cloud Function provides routing feature allowing