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Allow flexible constructor arguments in factory implementations

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Update `SpringFactoriesLoader` so that factory implementation classes
can have a constructor with arguments that are resolved dynamically.

Arguments are resolved using a `ArgumentResolver` interface that is
passed to the `loadFactories` method. This strategy interface is
intentionally simple and only allows resolution based on the argument
type. A number of convenience methods are provided to allow resolvers
to be built. For example:

	ArgumentResolver.of(String.class, "tests")
			.and(Integer.class, 123);

Factory implementation classes must have a non-ambiguous constructor
in order to be instantiated. The `SpringFactoriesLoader` uses the same
algorithm as `BeanUtils.getResolvableConstructor`.

See gh-28057

Co-authored-by: Madhura Bhave <bhavem@vmware.com>
Co-authored-by: Andy Wilkinson <wilkinsona@vmware.com>
This commit is contained in:
Phillip Webb
2022-02-15 15:34:38 -08:00
committed by Stephane Nicoll
parent ae1956cac7
commit 0b716c4f90
7 changed files with 760 additions and 37 deletions
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2
spring-core/src/test/resources/org/springframework/core/io/support/constructor-argument-factories/META-INF/spring.factories Normal file
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org.springframework.core.io.support.DummyFactory=\
org.springframework.core.io.support.ConstructorArgsDummyFactory

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spring-core/src/test/resources/org/springframework/core/io/support/multiple-arguments-factories/META-INF/spring.factories Normal file
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org.springframework.core.io.support.DummyFactory=\
org.springframework.core.io.support.MultipleConstructorArgsDummyFactory