spring ContextIdApplicationContextInitializer 源码
springboot ContextIdApplicationContextInitializer 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/ContextIdApplicationContextInitializer.java
/*
* Copyright 2012-2020 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;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.util.StringUtils;
/**
* {@link ApplicationContextInitializer} that sets the Spring
* {@link ApplicationContext#getId() ApplicationContext ID}. The
* {@code spring.application.name} property is used to create the ID. If the property is
* not set {@code application} is used.
*
* @author Dave Syer
* @author Andy Wilkinson
* @since 1.0.0
*/
public class ContextIdApplicationContextInitializer
implements ApplicationContextInitializer<ConfigurableApplicationContext>, Ordered {
private int order = Ordered.LOWEST_PRECEDENCE - 10;
public void setOrder(int order) {
this.order = order;
}
@Override
public int getOrder() {
return this.order;
}
@Override
public void initialize(ConfigurableApplicationContext applicationContext) {
ContextId contextId = getContextId(applicationContext);
applicationContext.setId(contextId.getId());
applicationContext.getBeanFactory().registerSingleton(ContextId.class.getName(), contextId);
}
private ContextId getContextId(ConfigurableApplicationContext applicationContext) {
ApplicationContext parent = applicationContext.getParent();
if (parent != null && parent.containsBean(ContextId.class.getName())) {
return parent.getBean(ContextId.class).createChildId();
}
return new ContextId(getApplicationId(applicationContext.getEnvironment()));
}
private String getApplicationId(ConfigurableEnvironment environment) {
String name = environment.getProperty("spring.application.name");
return StringUtils.hasText(name) ? name : "application";
}
/**
* The ID of a context.
*/
static class ContextId {
private final AtomicLong children = new AtomicLong();
private final String id;
ContextId(String id) {
this.id = id;
}
ContextId createChildId() {
return new ContextId(this.id + "-" + this.children.incrementAndGet());
}
String getId() {
return this.id;
}
}
}
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- 本文标签： Spring Boot Java Spring
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