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Extensions to integrate Micronaut and Spring

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/*
 * Copyright 2017-2020 original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micronaut.spring.context.aop;

import io.micronaut.aop.MethodInterceptor;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.Internal;
import io.micronaut.inject.ExecutableMethod;
import io.micronaut.spring.context.factory.MicronautBeanFactory;
import jakarta.inject.Singleton;
import org.springframework.beans.factory.BeanCreationException;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Implementation of {@link SpringConfigurationAdvice}.
 *
 * @author graemerocher
 * @since 1.0
 */
@Singleton
@Internal
public class SpringConfigurationInterceptor implements MethodInterceptor {

    private final Map computedSingletons = new ConcurrentHashMap<>(30);

    @Override
    public Object intercept(MethodInvocationContext context) {
        final AnnotationMetadata annotationMetadata = context.getAnnotationMetadata();
        final boolean isSingleton = MicronautBeanFactory.isSingleton(annotationMetadata);
        if (isSingleton) {
            final ExecutableMethod method = context.getExecutableMethod();
            synchronized (computedSingletons) {
                Object o = computedSingletons.get(method);
                if (o == null) {
                    o = context.proceed();
                    if (o == null) {
                        throw new BeanCreationException("Bean factor method [" + method + "] returned null");
                    }
                    computedSingletons.put(method, o);
                }
                return o;
            }
        }
        return context.proceed();
    }

}