spring ImportRuntimeHints 源码

  • 2022-08-08
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spring ImportRuntimeHints 代码

文件路径:/spring-context/src/main/java/org/springframework/context/annotation/ImportRuntimeHints.java

/*
 * Copyright 2002-2022 the original author or 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 org.springframework.context.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.aot.hint.RuntimeHintsRegistrar;

/**
 * Indicates that one or more {@link RuntimeHintsRegistrar} implementations
 * should be processed.
 *
 * <p>Unlike declaring {@link RuntimeHintsRegistrar} using
 * {@code spring/aot.factories}, this annotation allows for more flexible
 * registration where it is only processed if the annotated component or bean
 * method is actually registered in the bean factory. To illustrate this
 * behavior, consider the following example:
 *
 * <pre class="code">
 * &#064;Configuration
 * public class MyConfiguration {
 *
 *     &#064;Bean
 *     &#064;ImportRuntimeHints(MyHints.class)
 *     &#064;Conditional(MyCondition.class)
 *     public MyService myService() {
 *         return new MyService();
 *     }
 *
 * }</pre>
 *
 * If the configuration class above is processed, {@code MyHints} will be
 * contributed only if {@code MyCondition} matches. If it does not, and
 * therefore {@code MyService} is not defined as a bean, the hints will
 * not be processed either.
 *
 * <p>If several components refer to the same {@link RuntimeHintsRegistrar}
 * implementation, it is invoked only once for a given bean factory
 * processing.
 *
 * @author Brian Clozel
 * @author Stephane Nicoll
 * @since 6.0
 * @see org.springframework.aot.hint.RuntimeHints
 */
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ImportRuntimeHints {

	/**
	 * {@link RuntimeHintsRegistrar} implementations to process.
	 */
	Class<? extends RuntimeHintsRegistrar>[] value();

}

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