Spring Boot框架中的@Conditional注解示例详解

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
 
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;
 
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Conditional {
    Class<? extends Condition>[] value();
}

package com.bing.sh.datasource;
 
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;
 
/**
 * 如果为返回false,那么Spring会忽略配置类
 */
public class DataSourceCondition implements Condition {
    @Override
    public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {
        // 此处使用 conditionContext获取Environment即可。
        String configureDataSource = conditionContext.getEnvironment().getProperty("dataSource.none", "false");
        return "false".equals(configureDataSource);
    }
}

@Configuration
@Conditional(value = DataSourceCondition.class)
public class CustomDataSourceConfig {
}

spring.datasource.type=com.zaxxer.hikari.HikariDataSource