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GH-915 Make Kotlin initialization 'lazy'

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This way just like with any other function, Kotlin initialization, type discovery etc will be performed on function lookup
This will also ensure that order of various post processors doesn't get in the way.

Resolves #915
This commit is contained in:
Oleg Zhurakousky
2022-08-11 16:55:49 +02:00
parent 8999337255
commit 12f45f1507
4 changed files with 59 additions and 146 deletions
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9
spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/catalog/BeanFactoryAwareFunctionRegistry.java
View File

@@ -38,11 +38,13 @@ import org.springframework.cloud.function.context.FunctionProperties;
import org.springframework.cloud.function.context.FunctionRegistration;
import org.springframework.cloud.function.context.FunctionRegistry;
import org.springframework.cloud.function.context.config.FunctionContextUtils;
import org.springframework.cloud.function.context.config.KotlinLambdaToFunctionAutoConfiguration;
import org.springframework.cloud.function.core.FunctionInvocationHelper;
import org.springframework.cloud.function.json.JsonMapper;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.core.KotlinDetector;
import org.springframework.core.ResolvableType;
import org.springframework.core.convert.ConversionService;
import org.springframework.lang.Nullable;
@@ -144,6 +146,13 @@ public class BeanFactoryAwareFunctionRegistry extends SimpleFunctionRegistry imp
else if (functionCandidate instanceof BiFunction || functionCandidate instanceof BiConsumer) {
functionRegistration = this.registerMessagingBiFunction(functionCandidate, functionName);
}
else if (KotlinDetector.isKotlinType(functionCandidate.getClass())) {
KotlinLambdaToFunctionAutoConfiguration.KotlinFunctionWrapper wrapper =
new KotlinLambdaToFunctionAutoConfiguration.KotlinFunctionWrapper(functionCandidate);
wrapper.setName(functionName);
wrapper.setBeanFactory(this.applicationContext.getBeanFactory());
functionRegistration = wrapper.getFunctionRegistration();
}
else if (this.isFunctionPojo(functionCandidate, functionName)) {
Method functionalMethod = FunctionTypeUtils.discoverFunctionalMethod(functionCandidate.getClass());
functionCandidate = this.proxyTarget(functionCandidate, functionalMethod);

59
spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/KotlinLambdaToFunctionAutoConfiguration.java
View File

@@ -35,16 +35,7 @@ import reactor.core.publisher.Flux;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
@@ -83,46 +74,14 @@ public class KotlinLambdaToFunctionAutoConfiguration {
};
}
/**
* Will transform all discovered Kotlin's Function lambdas to java
* Supplier, Function and Consumer, retaining the original Kotlin type
* characteristics.
*
* @return the bean factory post processor
*/
@Bean
public static BeanFactoryPostProcessor kotlinToFunctionTransformer(ConfigurableListableBeanFactory beanFactory) {
return new BeanFactoryPostProcessor() {
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
throws BeansException {
String[] beanDefinitionNames = beanFactory.getBeanDefinitionNames();
for (String beanDefinitionName : beanDefinitionNames) {
BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanDefinitionName);
if (beanDefinition instanceof AnnotatedBeanDefinition && ((AnnotatedBeanDefinition) beanDefinition).getFactoryMethodMetadata() != null) {
String typeName = ((AnnotatedBeanDefinition) beanDefinition).getFactoryMethodMetadata().getReturnTypeName();
if (typeName.startsWith("kotlin.jvm.functions.Function")) {
RootBeanDefinition cbd = new RootBeanDefinition(KotlinFunctionWrapper.class);
ConstructorArgumentValues ca = new ConstructorArgumentValues();
ca.addGenericArgumentValue(beanDefinition);
cbd.setConstructorArgumentValues(ca);
((BeanDefinitionRegistry) beanFactory).registerBeanDefinition(beanDefinitionName + FunctionRegistration.REGISTRATION_NAME_SUFFIX, cbd);
}
}
}
}
};
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static final class KotlinFunctionWrapper implements Function<Object, Object>, Supplier<Object>, Consumer<Object>,
Function0<Object>, Function1<Object, Object>, Function2<Object, Object, Object>,
Function3<Object, Object, Object, Object>, Function4<Object, Object, Object, Object, Object>,
FactoryBean<FunctionRegistration>,
BeanNameAware,
BeanFactoryAware {
Function3<Object, Object, Object, Object>, Function4<Object, Object, Object, Object, Object> {
// FactoryBean<FunctionRegistration>,
// BeanNameAware,
// BeanFactoryAware {
private final Object kotlinLambdaTarget;
@@ -192,8 +151,7 @@ public class KotlinLambdaToFunctionAutoConfiguration {
return this.apply(null);
}
@Override
public FunctionRegistration getObject() throws Exception {
public FunctionRegistration getFunctionRegistration() {
String name = this.name.endsWith(FunctionRegistration.REGISTRATION_NAME_SUFFIX)
? this.name.replace(FunctionRegistration.REGISTRATION_NAME_SUFFIX, "")
: this.name;
@@ -284,17 +242,16 @@ public class KotlinLambdaToFunctionAutoConfiguration {
return type.getTypeName().contains(clazz.getName());
}
@Override
public Class<?> getObjectType() {
return FunctionRegistration.class;
}
@Override
public void setBeanName(String name) {
public void setName(String name) {
this.name = name;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = (ConfigurableListableBeanFactory) beanFactory;
}