spring PropertySourcesDeducer 源码
springboot PropertySourcesDeducer 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/PropertySourcesDeducer.java
/*
* Copyright 2012-2022 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.boot.context.properties;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySources;
import org.springframework.util.Assert;
/**
* Utility to deduce the {@link PropertySources} to use for configuration binding.
*
* @author Phillip Webb
*/
class PropertySourcesDeducer {
private static final Log logger = LogFactory.getLog(PropertySourcesDeducer.class);
private final ApplicationContext applicationContext;
PropertySourcesDeducer(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
PropertySources getPropertySources() {
PropertySourcesPlaceholderConfigurer configurer = getSinglePropertySourcesPlaceholderConfigurer();
if (configurer != null) {
return configurer.getAppliedPropertySources();
}
MutablePropertySources sources = extractEnvironmentPropertySources();
Assert.state(sources != null,
"Unable to obtain PropertySources from PropertySourcesPlaceholderConfigurer or Environment");
return sources;
}
private PropertySourcesPlaceholderConfigurer getSinglePropertySourcesPlaceholderConfigurer() {
// Take care not to cause early instantiation of all FactoryBeans
Map<String, PropertySourcesPlaceholderConfigurer> beans = this.applicationContext
.getBeansOfType(PropertySourcesPlaceholderConfigurer.class, false, false);
if (beans.size() == 1) {
return beans.values().iterator().next();
}
if (beans.size() > 1 && logger.isWarnEnabled()) {
logger.warn("Multiple PropertySourcesPlaceholderConfigurer beans registered " + beans.keySet()
+ ", falling back to Environment");
}
return null;
}
private MutablePropertySources extractEnvironmentPropertySources() {
Environment environment = this.applicationContext.getEnvironment();
if (environment instanceof ConfigurableEnvironment configurableEnvironment) {
return configurableEnvironment.getPropertySources();
}
return null;
}
}
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- 本文标签： Spring Boot Java Spring
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