服务网关zuul----zuul中的动态刷新路由配置

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Spring Cloud实战小贴士:Zuul处理Cookie和重定向

所以解决该问题的思路也很简单,我们只需要通过设置sensitiveHeaders即可,设置方法分为两种:

  • 全局设置:
    • zuul.sensitive-headers=
  • 指定路由设置:
    • zuul.routes.<routeName>.sensitive-headers=
    • zuul.routes.<routeName>.custom-sensitive-headers=true

重定向问题

在使用Spring Cloud Zuul对接Web网站的时候,处理完了会话控制问题之后。往往我们还会碰到如下图所示的问题,我们在浏览器中通过Zuul发起了登录请求,该请求会被路由到某WebSite服务,该服务在完成了登录处理之后,会进行重定向到某个主页或欢迎页面。此时,仔细的开发者会发现,在登录完成之后,我们浏览器中URL的HOST部分发生的改变,该地址变成了具体WebSite服务的地址了。这就是在这一节,我们将分析和解决的重定向问题!

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出现该问题的根源是Spring Cloud Zuul没有正确的处理HTTP请求头信息中的Host导致。在Brixton版本中,Spring Cloud Zuul的PreDecorationFilter过滤器实现时完全没有考虑这一问题,它更多的定位于REST API的网关。所以如果要在Brixton版本中增加这一特性就相对较为复杂,不过好在Camden版本之后,Spring Cloud Netflix 1.2.x版本的Zuul增强了该功能,我们只需要通过配置属性zuul.add-host-header=true就能让原本有问题的重定向操作得到正确的处理。关于更多Host头信息的处理,读者可以参考本文之前的分析思路,可以通过查看PreDecorationFilter过滤器的源码来详细更多实现细节。

http://blog.didispace.com/spring-cloud-zuul-cookie-redirect/




Spring cloud使用/refresh端点手动刷新配置

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https://tech.asimio.net/2017/10/10/Routing-requests-and-dynamically-refreshing-routes-using-Spring-Cloud-Zuul-Server.html

 

 

 https://www.cnblogs.com/flying607/p/8459397.html

spring扩展点之三:Spring 的监听事件 ApplicationListener 和 ApplicationEvent 用法,在spring启动后做些事情

服务网关zuul之七:zuul中的动态刷新路由配置

ApplicationEvent事件机制源码分析

在spring-cloud-netflix-core-1.4.4.RELEASE.jar中org.springframework.cloud.netflix.zuul.RoutesRefreshedEvent.java

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@SuppressWarnings("serial")
public class RoutesRefreshedEvent extends ApplicationEvent 

    private RouteLocator locator;

    public RoutesRefreshedEvent(RouteLocator locator) 
        super(locator);
        this.locator = locator;
    

    public RouteLocator getLocator() 
        return this.locator;
    

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在spring-cloud-netflix-core-1.4.4.RELEASE-sources.jar中的org.springframework.cloud.netflix.zuul.zuulZuulServerAutoConfiguration.java配置了监听事件。

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    private static class ZuulRefreshListener
            implements ApplicationListener<ApplicationEvent> 

        @Autowired
        private ZuulHandlerMapping zuulHandlerMapping;

        private HeartbeatMonitor heartbeatMonitor = new HeartbeatMonitor();

        @Override
        public void onApplicationEvent(ApplicationEvent event) 
            if (event instanceof ContextRefreshedEvent
                    || event instanceof RefreshScopeRefreshedEvent
                    || event instanceof RoutesRefreshedEvent) 
                this.zuulHandlerMapping.setDirty(true);
            
            else if (event instanceof HeartbeatEvent) 
                if (this.heartbeatMonitor.update(((HeartbeatEvent) event).getValue())) 
                    this.zuulHandlerMapping.setDirty(true);
                
            
        

    
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关于spring的ApplicationEvent见《spring扩展点之三:Spring 的监听事件 ApplicationListener 和 ApplicationEvent 用法,在spring启动后做些事情

https://blog.csdn.net/weixin_34267123/article/details/86021770

 

 

java配置

@Configuration
public class ZuulConfig 

    @Bean(name="zuul.CONFIGURATION_PROPERTIES")
    @RefreshScope
    @ConfigurationProperties("zuul")
    @Primary
    public ZuulProperties zuulProperties() 
        return new ZuulProperties();
    

修改路由

到git config server,修改zuul的路由,比如

zuul:
  host:
    socket-timeout-millis: 60000
    connect-timeout-millis: 30000
  proxy:
    addProxyHeaders: true
  routes:
    baidu:
      path: /baidu
      url: http://baidu.com

刷新

curl -i -X POST localhost:10000/refresh

验证

curl -i localhost:10000/routes


作者:go4it
链接:https://www.jianshu.com/p/a9332b111002
來源:简书
简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。
 
 

  我们知道在SpringCloud中,当配置变更时,我们通过访问http://xxxx/refresh,可以在不启动服务的情况下获取最新的配置,那么它是如何做到的呢,当我们更改数据库配置并刷新后,如何能获取最新的数据源对象呢?下面我们看SpringCloud如何做到的。

一、环境变化

1.1、关于ContextRefresher

  当我们访问/refresh时,会被RefreshEndpoint类所处理。我们来看源代码:

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/*
 * Copyright 2013-2014 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
 *
 *      http://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.cloud.endpoint;

import java.util.Arrays;
import java.util.Collection;
import java.util.Set;

import org.springframework.boot.actuate.endpoint.AbstractEndpoint;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.context.refresh.ContextRefresher;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedResource;

/**
 * @author Dave Syer
 * @author Venil Noronha
 */
@ConfigurationProperties(prefix = "endpoints.refresh", ignoreUnknownFields = false)
@ManagedResource
public class RefreshEndpoint extends AbstractEndpoint<Collection<String>> 

    private ContextRefresher contextRefresher;

    public RefreshEndpoint(ContextRefresher contextRefresher) 
        super("refresh");
        this.contextRefresher = contextRefresher;
    

    @ManagedOperation
    public String[] refresh() 
        Set<String> keys = contextRefresher.refresh();
        return keys.toArray(new String[keys.size()]);
    

    @Override
    public Collection<String> invoke() 
        return Arrays.asList(refresh());
    

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  通过源代码我们了解到:当访问refresh端点时,实际上执行的是ContextRefresher的refresh方法,那么我们继续追踪源代码,找到其refresh方法:

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public synchronized Set<String> refresh() 
        Map<String, Object> before = extract(
                this.context.getEnvironment().getPropertySources());
        addConfigFilesToEnvironment();
        Set<String> keys = changes(before,
                extract(this.context.getEnvironment().getPropertySources())).keySet();
        this.context.publishEvent(new EnvironmentChangeEvent(context, keys));
        this.scope.refreshAll();
        return keys;
    
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  我们可以看到refresh方法做了如下几件事情:

  1)获取刷新之前的所有PropertySource

  2) 调用addConfigFilesToEnvironment方法获取最新的配置

  3) 调用changes方法更新配置信息

  4) 发布EnvironmentChangeEnvent事件

  5)调用refreshScope的refreshAll方法刷新范围

  我们重点关注一下2,3,4步骤

1.2、addConfigFilesToEnvironment方法

  我们先来看看这个方法是怎么实现的:

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/* for testing */ ConfigurableApplicationContext addConfigFilesToEnvironment() 
        ConfigurableApplicationContext capture = null;
        try 
            StandardEnvironment environment = copyEnvironment(
                    this.context.getEnvironment());
            SpringApplicationBuilder builder = new SpringApplicationBuilder(Empty.class)
                    .bannerMode(Mode.OFF).web(false).environment(environment);
            // Just the listeners that affect the environment (e.g. excluding logging
            // listener because it has side effects)
            builder.application()
                    .setListeners(Arrays.asList(new BootstrapApplicationListener(),
                            new ConfigFileApplicationListener()));
            capture = builder.run();
            if (environment.getPropertySources().contains(REFRESH_ARGS_PROPERTY_SOURCE)) 
                environment.getPropertySources().remove(REFRESH_ARGS_PROPERTY_SOURCE);
            
            MutablePropertySources target = this.context.getEnvironment()
                    .getPropertySources();
            String targetName = null;
            for (PropertySource<?> source : environment.getPropertySources()) 
                String name = source.getName();
                if (target.contains(name)) 
                    targetName = name;
                
                if (!this.standardSources.contains(name)) 
                    if (target.contains(name)) 
                        target.replace(name, source);
                    
                    else 
                        if (targetName != null) 
                            target.addAfter(targetName, source);
                        
                        else 
                            // targetName was null so we are at the start of the list
                            target.addFirst(source);
                            targetName = name;
                        
                    
                
            
        
        finally 
            ConfigurableApplicationContext closeable = capture;
            while (closeable != null) 
                try 
                    closeable.close();
                
                catch (Exception e) 
                    // Ignore;
                
                if (closeable.getParent() instanceof ConfigurableApplicationContext) 
                    closeable = (ConfigurableApplicationContext) closeable.getParent();
                
                else 
                    break;
                
            
        
        return capture;
    
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  1) 该方法首先拷贝当前的Environment

  2) 通过SpringApplicationBuilder构建了一个简单的SpringBoot启动程序并启动

builder.application().setListeners(Arrays.asList(new BootstrapApplicationListener(),
                            new ConfigFileApplicationListener()));

  这里面会添加两个监听器分别为:BootstrapApplicationListener与ConfigFileApplicationListener,通过先前的学习,我们知道BootstrapApplicationListener是引导程序的核心监听器,而ConfigFileApplicationListener也是非常重要的类:

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/*
 * Copyright 2012-2017 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
 *
 *      http://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.config;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Set;

import org.apache.commons.logging.Log;

import org.springframework.beans.BeansException;
import org.springframework.beans.CachedIntrospectionResults;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.bind.PropertiesConfigurationFactory;
import org.springframework.boot.bind.PropertySourcesPropertyValues;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.boot.context.event.ApplicationPreparedEvent;
import org.springframework.boot.env.EnumerableCompositePropertySource;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.boot.env.PropertySourcesLoader;
import org.springframework.boot.logging.DeferredLog;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.ConfigurationClassPostProcessor;
import org.springframework.context.event.SmartApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.PropertySources;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.SpringFactoriesLoader;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindException;

/**
 * @link EnvironmentPostProcessor that configures the context environment by loading
 * properties from well known file locations. By default properties will be loaded from
 * ‘application.properties‘ and/or ‘application.yml‘ files in the following locations:
 * <ul>
 * <li>classpath:</li>
 * <li>file:./</li>
 * <li>classpath:config/</li>
 * <li>file:./config/:</li>
 * </ul>
 * <p>
 * Alternative search locations and names can be specified using
 * @link #setSearchLocations(String) and @link #setSearchNames(String).
 * <p>
 * Additional files will also be loaded based on active profiles. For example if a ‘web‘
 * profile is active ‘application-web.properties‘ and ‘application-web.yml‘ will be
 * considered.
 * <p>
 * The ‘spring.config.name‘ property can be used to specify an alternative name to load
 * and the ‘spring.config.location‘ property can be used to specify alternative search
 * locations or specific files.
 * <p>
 * Configuration properties are also bound to the @link SpringApplication. This makes it
 * possible to set @link SpringApplication properties dynamically, like the sources
 * ("spring.main.sources" - a CSV list) the flag to indicate a web environment
 * ("spring.main.web_environment=true") or the flag to switch off the banner
 * ("spring.main.show_banner=false").
 *
 * @author Dave Syer
 * @author Phillip Webb
 * @author Stephane Nicoll
 * @author Andy Wilkinson
 * @author Eddú Meléndez
 */
public class ConfigFileApplicationListener
        implements EnvironmentPostProcessor, SmartApplicationListener, Ordered 

    private static final String DEFAULT_PROPERTIES = "defaultProperties";

    // Note the order is from least to most specific (last one wins)
    private static final String DEFAULT_SEARCH_LOCATIONS = "classpath:/,classpath:/config/,file:./,file:./config/";

    private static final String DEFAULT_NAMES = "application";

    /**
     * The "active profiles" property name.
     */
    public static final String ACTIVE_PROFILES_PROPERTY = "spring.profiles.active";

    /**
     * The "includes profiles" property name.
     */
    public static final String INCLUDE_PROFILES_PROPERTY = "spring.profiles.include";

    /**
     * The "config name" property name.
     */
    public static final String CONFIG_NAME_PROPERTY = "spring.config.name";

    /**
     * The "config location" property name.
     */
    public static final String CONFIG_LOCATION_PROPERTY = "spring.config.location";

    /**
     * The default order for the processor.
     */
    public static final int DEFAULT_ORDER = Ordered.HIGHEST_PRECEDENCE + 10;

    /**
     * Name of the application configuration @link PropertySource.
     */
    public static final String APPLICATION_CONFIGURATION_PROPERTY_SOURCE_NAME = "applicationConfigurationProperties";

    private final DeferredLog logger = new DeferredLog();

    private String searchLocations;

    private String names;

    private int order = DEFAULT_ORDER;

    private final ConversionService conversionService = new DefaultConversionService();

    @Override
    public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) 
        return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(eventType)
                || ApplicationPreparedEvent.class.isAssignableFrom(eventType);
    

    @Override
    public boolean supportsSourceType(Class<?> aClass) 
        return true;
    

    @Override
    public void onApplicationEvent(ApplicationEvent event) 
        if (event instanceof ApplicationEnvironmentPreparedEvent) 
            onApplicationEnvironmentPreparedEvent(
                    (ApplicationEnvironmentPreparedEvent) event);
        
        if (event instanceof ApplicationPreparedEvent) 
            onApplicationPreparedEvent(event);
        
    

    private void onApplicationEnvironmentPreparedEvent(
            ApplicationEnvironmentPreparedEvent event) 
        List<EnvironmentPostProcessor> postProcessors = loadPostProcessors();
        postProcessors.add(this);
        AnnotationAwareOrderComparator.sort(postProcessors);
        for (EnvironmentPostProcessor postProcessor : postProcessors) 
            postProcessor.postProcessEnvironment(event.getEnvironment(),
                    event.getSpringApplication());
        
    

    List<EnvironmentPostProcessor> loadPostProcessors() 
        return SpringFactoriesLoader.loadFactories(EnvironmentPostProcessor.class,
                getClass().getClassLoader());
    

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment,
            SpringApplication application) 
        addPropertySources(environment, application.getResourceLoader());
        configureIgnoreBeanInfo(environment);
        bindToSpringApplication(environment, application);
    

    private void configureIgnoreBeanInfo(ConfigurableEnvironment environment) 
        if (System.getProperty(
                CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME) == null) 
            RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(environment,
                    "spring.beaninfo.");
            Boolean ignore = resolver.getProperty("ignore", Boolean.class, Boolean.TRUE);
            System.setProperty(CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME,
                    ignore.toString());
        
    

    private void onApplicationPreparedEvent(ApplicationEvent event) 
        this.logger.replayTo(ConfigFileApplicationListener.class);
        addPostProcessors(((ApplicationPreparedEvent) event).getApplicationContext());
    

    /**
     * Add config file property sources to the specified environment.
     * @param environment the environment to add source to
     * @param resourceLoader the resource loader
     * @see #addPostProcessors(ConfigurableApplicationContext)
     */
    protected void addPropertySources(ConfigurableEnvironment environment,
            ResourceLoader resourceLoader) 
        RandomValuePropertySource.addToEnvironment(environment);
        new Loader(environment, resourceLoader).load();
    

    /**
     * Bind the environment to the @link SpringApplication.
     * @param environment the environment to bind
     * @param application the application to bind to
     */
    protected void bindToSpringApplication(ConfigurableEnvironment environment,
            SpringApplication application) 
        PropertiesConfigurationFactory<SpringApplication> binder = new PropertiesConfigurationFactory<SpringApplication>(
                application);
        binder.setTargetName("spring.main");
        binder.setConversionService(this.conversionService);
        binder.setPropertySources(environment.getPropertySources());
        try 
            binder.bindPropertiesToTarget();
        
        catch (BindException ex) 
            throw new IllegalStateException("Cannot bind to SpringApplication", ex);
        
    

    /**
     * Add appropriate post-processors to post-configure the property-sources.
     * @param context the context to configure
     */
    protected void addPostProcessors(ConfigurableApplicationContext context) 
        context.addBeanFactoryPostProcessor(
                new PropertySourceOrderingPostProcessor(context));
    

    public void setOrder(int order) 
        this.order = order;
    

    @Override
    public int getOrder() 
        return this.order;
    

    /**
     * Set the search locations that will be considered as a comma-separated list. Each
     * search location should be a directory path (ending in "/") and it will be prefixed
     * by the file names constructed from @link #setSearchNames(String) search names and
     * profiles (if any) plus file extensions supported by the properties loaders.
     * Locations are considered in the order specified, with later items taking precedence
     * (like a map merge).
     * @param locations the search locations
     */
    public void setSearchLocations(String locations) 
        Assert.hasLength(locations, "Locations must not be empty");
        this.searchLocations = locations;
    

    /**
     * Sets the names of the files that should be loaded (excluding file extension) as a
     * comma-separated list.
     * @param names the names to load
     */
    public void setSearchNames(String names) 
        Assert.hasLength(names, "Names must not be empty");
        this.names = names;
    

    /**
     * @link BeanFactoryPostProcessor to re-order our property sources below any
     * @code @PropertySource items added by the @link ConfigurationClassPostProcessor.
     */
    private class PropertySourceOrderingPostProcessor
            implements BeanFactoryPostProcessor, Ordered 

        private ConfigurableApplicationContext context;

        PropertySourceOrderingPostProcessor(ConfigurableApplicationContext context) 
            this.context = context;
        

        @Override
        public int getOrder() 
            return Ordered.HIGHEST_PRECEDENCE;
        

        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
                throws BeansException 
            reorderSources(this.context.getEnvironment());
        

        private void reorderSources(ConfigurableEnvironment environment) 
            ConfigurationPropertySources
                    .finishAndRelocate(environment.getPropertySources());
            PropertySource<?> defaultProperties = environment.getPropertySources()
                    .remove(DEFAULT_PROPERTIES);
            if (defaultProperties != null) 
                environment.getPropertySources().addLast(defaultProperties);
            
        

    

    /**
     * Loads candidate property sources and configures the active profiles.
     */
    private class Loader 

        private final Log logger = ConfigFileApplicationListener.this.logger;

        private final ConfigurableEnvironment environment;

        private final ResourceLoader resourceLoader;

        private PropertySourcesLoader propertiesLoader;

        private Queue<Profile> profiles;

        private List<Profile> processedProfiles;

        private boolean activatedProfiles;

        Loader(ConfigurableEnvironment environment, ResourceLoader resourceLoader) 
            this.environment = environment;
            this.resourceLoader = resourceLoader == null ? new DefaultResourceLoader()
                    : resourceLoader;
        

        public void load() 
            this.propertiesLoader = new PropertySourcesLoader();
            this.activatedProfiles = false;
            this.profiles = Collections.asLifoQueue(new LinkedList<Profile>());
            this.processedProfiles = new LinkedList<Profile>();

            // Pre-existing active profiles set via Environment.setActiveProfiles()
            // are additional profiles and config files are allowed to add more if
            // they want to, so don‘t call addActiveProfiles() here.
            Set<Profile> initialActiveProfiles = initializeActiveProfiles();
            this.profiles.addAll(getUnprocessedActiveProfiles(initialActiveProfiles));
            if (this.profiles.isEmpty()) 
                for (String defaultProfileName : this.environment.getDefaultProfiles()) 
                    Profile defaultProfile = new Profile(defaultProfileName, true);
                    if (!this.profiles.contains(defaultProfile)) 
                        this.profiles.add(defaultProfile);
                    
                
            

            // The default profile for these purposes is represented as null. We add it
            // last so that it is first out of the queue (active profiles will then
            // override any settings in the defaults when the list is reversed later).
            this.profiles.add(null);

            while (!this.profiles.isEmpty()) 
                Profile profile = this.profiles.poll();
                for (String location : getSearchLocations()) 
                    if (!location.endsWith("/")) 
                        // location is a filename already, so don‘t search for more
                        // filenames
                        load(location, null, profile);
                    
                    else 
                        for (String name : getSearchNames()) 
                            load(location, name, profile);
                        
                    
                
                this.processedProfiles.add(profile);
            

            addConfigurationProperties(this.propertiesLoader.getPropertySources());
        

        private Set<Profile> initializeActiveProfiles() 
            if (!this.environment.containsProperty(ACTIVE_PROFILES_PROPERTY)
                    && !this.environment.containsProperty(INCLUDE_PROFILES_PROPERTY)) 
                return Collections.emptySet();
            
            // Any pre-existing active profiles set via property sources (e.g. System
            // properties) take precedence over those added in config files.
            SpringProfiles springProfiles = bindSpringProfiles(
                    this.environment.getPropertySources());
            Set<Profile> activeProfiles = new LinkedHashSet<Profile>(
                    springProfiles.getActiveProfiles());
            activeProfiles.addAll(springProfiles.getIncludeProfiles());
            maybeActivateProfiles(activeProfiles);
            return activeProfiles;
        

        /**
         * Return the active profiles that have not been processed yet. If a profile is
         * enabled via both @link #ACTIVE_PROFILES_PROPERTY and
         * @link ConfigurableEnvironment#addActiveProfile(String) it needs to be
         * filtered so that the @link #ACTIVE_PROFILES_PROPERTY value takes precedence.
         * <p>
         * Concretely, if the "cloud" profile is enabled via the environment, it will take
         * less precedence that any profile set via the @link #ACTIVE_PROFILES_PROPERTY.
         * @param initialActiveProfiles the profiles that have been enabled via
         * @link #ACTIVE_PROFILES_PROPERTY
         * @return the unprocessed active profiles from the environment to enable
         */
        private List<Profile> getUnprocessedActiveProfiles(
                Set<Profile> initialActiveProfiles) 
            List<Profile> unprocessedActiveProfiles = new ArrayList<Profile>();
            for (String profileName : this.environment.getActiveProfiles()) 
                Profile profile = new Profile(profileName);
                if (!initialActiveProfiles.contains(profile)) 
                    unprocessedActiveProfiles.add(profile);
                
            
            // Reverse them so the order is the same as from getProfilesForValue()
            // (last one wins when properties are eventually resolved)
            Collections.reverse(unprocessedActiveProfiles);
            return unprocessedActiveProfiles;
        

        private void load(String location, String name, Profile profile) 
            String group = "profile=" + (profile == null ? "" : profile);
            if (!StringUtils.hasText(name)) 
                // Try to load directly from the location
                loadIntoGroup(group, location, profile);
            
            else 
                // Search for a file with the given name
                for (String ext : this.propertiesLoader.getAllFileExtensions()) 
                    if (profile != null) 
                        // Try the profile-specific file
                        loadIntoGroup(group, location + name + "-" + profile + "." + ext,
                                null);
                        for (Profile processedProfile : this.processedProfiles) 
                            if (processedProfile != null) 
                                loadIntoGroup(group, location + name + "-"
                                        + processedProfile + "." + ext, profile);
                            
                        
                        // Sometimes people put "spring.profiles: dev" in
                        // application-dev.yml (gh-340). Arguably we should try and error
                        // out on that, but we can be kind and load it anyway.
                        loadIntoGroup(group, location + name + "-" + profile + "." + ext,
                                profile);
                    
                    // Also try the profile-specific section (if any) of the normal file
                    loadIntoGroup(group, location + name + "." + ext, profile);
                
            
        

        private PropertySource<?> loadIntoGroup(String identifier, String location,
                Profile profile) 
            try 
                return doLoadIntoGroup(identifier, location, profile);
            
            catch (Exception ex) 
                throw new IllegalStateException(
                        "Failed to load property source from location ‘" + location + "‘",
                        ex);
            
        

        private PropertySource<?> doLoadIntoGroup(String identifier, String location,
                Profile profile) throws IOException 
            Resource resource = this.resourceLoader.getResource(location);
            PropertySource<?> propertySource = null;
            StringBuilder msg = new StringBuilder();
            if (resource != null && resource.exists()) 
                String name = "applicationConfig: [" + location + "]";
                String group = "applicationConfig: [" + identifier + "]";
                propertySource = this.propertiesLoader.load(resource, group, name,
                        (profile == null ? null : profile.getName()));
                if (propertySource != null) 
                    msg.append("Loaded ");
                    handleProfileProperties(propertySource);
                
                else 
                    msg.append("Skipped (empty) ");
                
            
            else 
                msg.append("Skipped ");
            
            msg.append("config file ");
            msg.append(getResourceDescription(location, resource));
            if (profile != null) 
                msg.append(" for profile ").append(profile);
            
            if (resource == null || !resource.exists()) 
                msg.append(" resource not found");
                this.logger.trace(msg);
            
            else 
                this.logger.debug(msg);
            
            return propertySource;
        

        private String getResourceDescription(String location, Resource resource) 
            String resourceDescription = "‘" + location + "‘";
            if (resource != null) 
                try 
                    resourceDescription = String.format("‘%s‘ (%s)",
                            resource.getURI().toASCIIString(), location);
                
                catch (IOException ex) 
                    // Use the location as the description
                
            
            return resourceDescription;
        

        private void handleProfileProperties(PropertySource<?> propertySource) 
            SpringProfiles springProfiles = bindSpringProfiles(propertySource);
            maybeActivateProfiles(springProfiles.getActiveProfiles());
            addProfiles(springProfiles.getIncludeProfiles());
        

        private SpringProfiles bindSpringProfiles(PropertySource<?> propertySource) 
            MutablePropertySources propertySources = new MutablePropertySources();
            propertySources.addFirst(propertySource);
            return bindSpringProfiles(propertySources);
        

        private SpringProfiles bindSpringProfiles(PropertySources propertySources) 
            SpringProfiles springProfiles = new SpringProfiles();
            RelaxedDataBinder dataBinder = new RelaxedDataBinder(springProfiles,
                    "spring.profiles");
            dataBinder.bind(new PropertySourcesPropertyValues(propertySources, false));
            springProfiles.setActive(resolvePlaceholders(springProfiles.getActive()));
            springProfiles.setInclude(resolvePlaceholders(springProfiles.getInclude()));
            return springProfiles;
        

        private List<String> resolvePlaceholders(List<String> values) 
            List<String> resolved = new ArrayList<String>();
            for (String value : values) 
                resolved.add(this.environment.resolvePlaceholders(value));
            
            return resolved;
        

        private void maybeActivateProfiles(Set<Profile> profiles) 
            if (this.activatedProfiles) 
                if (!profiles.isEmpty()) 
                    this.logger.debug("Profiles already activated, ‘" + profiles
                            + "‘ will not be applied");
                
                return;
            
            if (!profiles.isEmpty()) 
                addProfiles(profiles);
                this.logger.debug("Activated profiles "
                        + StringUtils.collectionToCommaDelimitedString(profiles));
                this.activatedProfiles = true;
                removeUnprocessedDefaultProfiles();
            
        

        private void removeUnprocessedDefaultProfiles() 
            for (Iterator<Profile> iterator = this.profiles.iterator(); iterator
                    .hasNext();) 
                if (iterator.next().isDefaultProfile()) 
                    iterator.remove();
                
            
        

        private void addProfiles(Set<Profile> profiles) 
            for (Profile profile : profiles) 
                this.profiles.add(profile);
                if (!environmentHasActiveProfile(profile.getName())) 
                    // If it‘s already accepted we assume the order was set
                    // intentionally
                    prependProfile(this.environment, profile);
                
            
        

        private boolean environmentHasActiveProfile(String profile) 
            for (String activeProfile : this.environment.getActiveProfiles()) 
                if (activeProfile.equals(profile)) 
                    return true;
                
            
            return false;
        

        private void prependProfile(ConfigurableEnvironment environment,
                Profile profile) 
            Set<String> profiles = new LinkedHashSet<String>();
            environment.getActiveProfiles(); // ensure they are initialized
            // But this one should go first (last wins in a property key clash)
            profiles.add(profile.getName());
            profiles.addAll(Arrays.asList(environment.getActiveProfiles()));
            environment.setActiveProfiles(profiles.toArray(new String[profiles.size()]));
        

        private Set<String> getSearchLocations() 
            Set<String> locations = new LinkedHashSet<String>();
            // User-configured settings take precedence, so we do them first
            if (this.environment.containsProperty(CONFIG_LOCATION_PROPERTY)) 
                for (String path : asResolvedSet(
                        this.environment.getProperty(CONFIG_LOCATION_PROPERTY), null)) 
                    if (!path.contains("$")) 
                        path = StringUtils.cleanPath(path);
                        if (!ResourceUtils.isUrl(path)) 
                            path = ResourceUtils.FILE_URL_PREFIX + path;
                        
                    
                    locations.add(path);
                
            
            locations.addAll(
                    asResolvedSet(ConfigFileApplicationListener.this.searchLocations,
                            DEFAULT_SEARCH_LOCATIONS));
            return locations;
        

        private Set<String> getSearchNames() 
            if (this.environment.containsProperty(CONFIG_NAME_PROPERTY)) 
                return asResolvedSet(this.environment.getProperty(CONFIG_NAME_PROPERTY),
                        null);
            
            return asResolvedSet(ConfigFileApplicationListener.this.names, DEFAULT_NAMES);
        

        private Set<String> asResolvedSet(String value, String fallback) 
            List<String> list = Arrays.asList(StringUtils.trimArrayElements(
                    StringUtils.commaDelimitedListToStringArray(value != null
                            ? this.environment.resolvePlaceholders(value) : fallback)));
            Collections.reverse(list);
            return new LinkedHashSet<String>(list);
        

        private void addConfigurationProperties(MutablePropertySources sources) 
            List<PropertySource<?>> reorderedSources = new ArrayList<PropertySource<?>>();
            for (PropertySource<?> item : sources) 
                reorderedSources.add(item);
            
            addConfigurationProperties(
                    new ConfigurationPropertySources(reorderedSources));
        

        private void addConfigurationProperties(
                ConfigurationPropertySources configurationSources) 
            MutablePropertySources existingSources = this.environment
                    .getPropertySources();
            if (existingSources.contains(DEFAULT_PROPERTIES)) 
                existingSources.addBefore(DEFAULT_PROPERTIES, configurationSources);
            
            else 
                existingSources.addLast(configurationSources);
            
        

    

    private static class Profile 

        private final String name;

        private final boolean defaultProfile;

        Profile(String name) 
            this(name, false);
        

        Profile(String name, boolean defaultProfile) 
            Assert.notNull(name, "Name must not be null");
            this.name = name;
            this.defaultProfile = defaultProfile;
        

        public String getName() 
            return this.name;
        

        public boolean isDefaultProfile() 
            return this.defaultProfile;
        

        @Override
        public String toString() 
            return this.name;
        

        @Override
        public int hashCode() 
            return this.name.hashCode();
        

        @Override
        public boolean equals(Object obj) 
            if (obj == this) 
                return true;
            
            if (obj == null || obj.getClass() != getClass()) 
                return false;
            
            return ((Profile) obj).name.equals(this.name);
        

    

    /**
     * Holds the configuration @link PropertySources as they are loaded can relocate
     * them once configuration classes have been processed.
     */
    static class ConfigurationPropertySources
            extends EnumerablePropertySource<Collection<PropertySource<?>>> 

        private final Collection<PropertySource<?>> sources;

        private final String[] names;

        ConfigurationPropertySources(Collection<PropertySource<?>> sources) 
            super(APPLICATION_CONFIGURATION_PROPERTY_SOURCE_NAME, sources);
            this.sources = sources;
            List<String> names = new ArrayList<String>();
            for (PropertySource<?> source : sources) 
                if (source instanceof EnumerablePropertySource) 
                    names.addAll(Arrays.asList(
                            ((EnumerablePropertySource<?>) source).getPropertyNames()));
                
            
            this.names = names.toArray(new String[names.size()]);
        

        @Override
        public Object getProperty(String name) 
            for (PropertySource<?> propertySource : this.sources) 
                Object value = propertySource.getProperty(name);
                if (value != null) 
                    return value;
                
            
            return null;
        

        public static void finishAndRelocate(MutablePropertySources propertySources) 
            String name = APPLICATION_CONFIGURATION_PROPERTY_SOURCE_NAME;
            ConfigurationPropertySources removed = (ConfigurationPropertySources) propertySources
                    .get(name);
            if (removed != null) 
                for (PropertySource<?> propertySource : removed.sources) 
                    if (propertySource instanceof EnumerableCompositePropertySource) 
                        EnumerableCompositePropertySource composite = (EnumerableCompositePropertySource) propertySource;
                        for (PropertySource<?> nested : composite.getSource()) 
                            propertySources.addAfter(name, nested);
                            name = nested.getName();
                        
                    
                    else 
                        propertySources.addAfter(name, propertySource);
                    
                
                propertySources.remove(APPLICATION_CONFIGURATION_PROPERTY_SOURCE_NAME);
            
        

        @Override
        public String[] getPropertyNames() 
            return this.names;
        

    

    /**
     * Holder for @code spring.profiles properties.
     */
    static final class SpringProfiles 

        private List<String> active = new ArrayList<String>();

        private List<String> include = new ArrayList<String>();

        public List<String> getActive() 
            return this.active;
        

        public void setActive(List<String> active) 
            this.active = active;
        

        public List<String> getInclude() 
            return this.include;
        

        public void setInclude(List<String> include) 
            this.include = include;
        

        Set<Profile> getActiveProfiles() 
            return asProfileSet(this.active);
        

        Set<Profile> getIncludeProfiles() 
            return asProfileSet(this.include);
        

        private Set<Profile> asProfileSet(List<String> profileNames) 
            List<Profile> profiles = new ArrayList<Profile>();
            for (String profileName : profileNames) 
                profiles.add(new Profile(profileName));
            
            Collections.reverse(profiles);
            return new LinkedHashSet<Profile>(profiles);
        

    

技术图片

  根据javadoc注释的说明,这个类会从指定的位置加载application.properties或者application.yml并将它们的属性读到Envrionment当中,其中这几个方法大家关注下:

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    @Override
    public void onApplicationEvent(ApplicationEvent event) 
        if (event instanceof ApplicationEnvironmentPreparedEvent) 
            onApplicationEnvironmentPreparedEvent(
                    (ApplicationEnvironmentPreparedEvent) event);
        
        if (event instanceof ApplicationPreparedEvent) 
            onApplicationPreparedEvent(event);
        
    
技术图片
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  当springboot程序启动时一定会触发该事件监听,如果当前是 ApplicationEnvironmentPreparedEvent事件就会调用 onApplicationEnvironmentPreparedEvent方法,最终该方法会执行:

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    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment,
            SpringApplication application) 
        addPropertySources(environment, application.getResourceLoader());
        configureIgnoreBeanInfo(environment);
        bindToSpringApplication(environment, application);
    
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   其中 bindToSpringApplication方法为:

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/**
     * Bind the environment to the @link SpringApplication.
     * @param environment the environment to bind
     * @param application the application to bind to
     */
    protected void bindToSpringApplication(ConfigurableEnvironment environment,
            SpringApplication application) 
        PropertiesConfigurationFactory<SpringApplication> binder = new PropertiesConfigurationFactory<SpringApplication>(
                application);
        binder.setTargetName("spring.main");
        binder.setConversionService(this.conversionService);
        binder.setPropertySources(environment.getPropertySources());
        try 
            binder.bindPropertiesToTarget();
        
        catch (BindException ex) 
            throw new IllegalStateException("Cannot bind to SpringApplication", ex);
        
    
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  很明显该方法是将Environment绑定到对应SpringApplication上,通过这个类就可以获取到我们更改过后的配置了

1.3、changes方法

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private Map<String, Object> changes(Map<String, Object> before,
            Map<String, Object> after) 
        Map<String, Object> result = new HashMap<String, Object>();
        for (String key : before.keySet()) 
            if (!after.containsKey(key)) 
                result.put(key, null);
            
            else if (!equal(before.get(key), after.get(key))) 
                result.put(key, after.get(key));
            
        
        for (String key : after.keySet()) 
            if (!before.containsKey(key)) 
                result.put(key, after.get(key));
            
        
        return result;
    
技术图片
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  changes方法其实就是处理配置变更信息的,分以下几种情况:

  1)如果刷新过后配置文件新增配置就添加到Map里

  2)  如果有配置变更就添加变更后的配置

  3) 如果删除了原先的配置,就把原先的key对应的值设置为null

 

  至此经过changes方法后,上下文环境已经拥有最新的配置了。

1.4、发布事件

  当上述步骤都执行完毕后,紧接着会发布EnvrionmentChangeEvent事件,可是这个事件谁来监听呢?在这里我贴出官网的一段描述:

   应用程序将收听EnvironmentChangeEvent,并以几种标准方式进行更改(用户可以以常规方式添加ApplicationListeners附加ApplicationListeners)。当观察到EnvironmentChangeEvent时,它将有一个已更改的键值列表,应用程序将使用以下内容:

1.重新绑定上下文中的任何@ConfigurationProperties bean

2.为logging.level.*中的任何属性设置记录器级别

  根据官网描述我们知道将变更一下操作行为@ConfigurationProperties的bean与更改日志level,那么如何做到的呢?结合官网文档我们来关注以下两个类:

  ConfigurationPropertiesRebinder:

技术图片 View Code

  我们可以看到该类监听了ChangeEnvrionmentEvent事件,它最主要作用是拿到更新的配置以后,重新绑定@ConfigurationProperties标记的类使之能够读取最新的属性

  LoggingRebinder:

技术图片 View Code

  该类也是监听了ChangeEnvrionmentEvent事件,用于重新绑定日志级别

 

二、刷新范围

  我们考虑如下场景,当我们变更数据库配置后,通过refresh刷新,虽然能获取到最新的配置,可是我们的DataSource对象早就被初始化好了,换句话说即便配置刷新了我们拿到的依然是配置刷新前的对象。怎么解决这个问题呢?

  我们继续看ContextRefresher的refresh方法,最后有一处代码值得我们关注一下this.scope.refreshAll(),此处scope对象是RefreshScope类型,那么这个类有什么作用呢?那么我们先要关注一下@RefreshScope注解。在这里我在贴出官网一段解释:

  当配置更改时,标有@RefreshScope的Spring @Bean将得到特殊处理。这解决了状态bean在初始化时只注入配置的问题。例如,如果通过Environment更改数据库URL时DataSource有开放连接,那么我们可能希望这些连接的持有人能够完成他们正在做的工作。然后下一次有人从游泳池借用一个连接,他得到一个新的URL
  

   刷新范围bean是在使用时初始化的懒惰代理(即当调用一个方法时),并且作用域作为初始值的缓存。要强制bean重新初始化下一个方法调用,您只需要使其缓存条目无效。RefreshScope是上下文中的一个bean,它有一个公共方法refreshAll()来清除目标缓存中的范围内的所有bean。还有一个refresh(String)方法可以按名称刷新单个bean。此功能在/refresh端点(通过HTTP或JMX)中公开。

   这里我贴出@RefreshScope源码:

技术图片 View Code

  在这个注解上我们关注一下此处标记了@Scope("refresh"),我们知道Spring的Bean属性有个叫scope的,它定义了bean的作用范围,常见的有singleon,prototype,session等。此处新定义了一个范围叫做refresh,在此我贴出RefreshScope的源代码来分析一下:

技术图片 View Code

  该类继承了GenericScope:

技术图片 View Code

 

     这里面我们先看一下RefreshScope的构造函数:

/**
     * Create a scope instance and give it the default name: "refresh".
     */
    public RefreshScope() 
        super.setName("refresh");
    

  这里面创建了一个名字为refresh的scope。

  紧接着在它的父类里我们可以看一下这个方法:

技术图片
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   @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
            throws BeansException 
        this.beanFactory = beanFactory;
        beanFactory.registerScope(this.name, this);
        setSerializationId(beanFactory);
    
技术图片
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  此方法中使用BeanFactory注册了一个refresh的范围,使得scope为refresh的bean生效。@RefreshScope标注的类还有一个特点:会使用代理对象并进行延迟加载。我们来看一下postProcessBeanDefinitionRegistry方法

技术图片
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@Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry)
            throws BeansException 
        for (String name : registry.getBeanDefinitionNames()) 
            BeanDefinition definition = registry.getBeanDefinition(name);
            if (definition instanceof RootBeanDefinition) 
                RootBeanDefinition root = (RootBeanDefinition) definition;
                if (root.getDecoratedDefinition() != null && root.hasBeanClass()
                        && root.getBeanClass() == ScopedProxyFactoryBean.class) 
                    if (getName().equals(root.getDecoratedDefinition().getBeanDefinition()
                            .getScope())) 
                        root.setBeanClass(LockedScopedProxyFactoryBean.class);
                    
                
            
        
    
技术图片
技术图片

  该方法遍历所有的bean定义 如果当前的bean的scope为refresh,那么就把当前的bean设置为 LockedScopedProxyFactoryBean的代理对象。

  RefreshScope还会监听一个ContextRefreshedEvent,该事件会在ApplicationContext初始化或者refreshed时触发,我们来看一下代码:

  

技术图片
技术图片
   @EventListener
    public void start(ContextRefreshedEvent event) 
        if (event.getApplicationContext() == this.context && this.eager
                && this.registry != null) 
            eagerlyInitialize();
        
    

    private void eagerlyInitialize() 
        for (String name : this.context.getBeanDefinitionNames()) 
            BeanDefinition definition = this.registry.getBeanDefinition(name);
            if (this.getName().equals(definition.getScope()) && !definition.isLazyInit()) 
                Object bean = this.context.getBean(name);
                if (bean != null) 
                    bean.getClass();
                
            
        
    
技术图片
技术图片

  注意此处获取refreshscope的bean,其中getBean是一个复杂而又繁琐的过程,此处我们先不在这里讨论,只不过经过这个方法以后,其通过代理机制会在GernericScope的BeanLifecycleWrapperCache缓存里把这个@RefreshScope标记的bean添加进去。

  最后我们回过头来看一看RefreshScope的refreshAll方法:

技术图片
技术图片
    @ManagedOperation(description = "Dispose of the current instance of all beans in this scope and force a refresh on next method execution.")
    public void refreshAll() 
        super.destroy();
        this.context.publishEvent(new RefreshScopeRefreshedEvent());
    

//.......GernericScope的destroy方法

    @Override
    public void destroy() 
        List<Throwable> errors = new ArrayList<Throwable>();
        Collection<BeanLifecycleWrapper> wrappers = this.cache.clear();
        for (BeanLifecycleWrapper wrapper : wrappers) 
            try 
                Lock lock = locks.get(wrapper.getName()).writeLock();
                lock.lock();
                try 
                    wrapper.destroy();
                
                finally 
                    lock.unlock();
                
            
            catch (RuntimeException e) 
                errors.add(e);
            
        
        if (!errors.isEmpty()) 
            throw wrapIfNecessary(errors.get(0));
        
        this.errors.clear();
    
技术图片
技术图片

  这里的代码逻辑很简单清除与释放缓存里被@RefreshScope标记的bean 。

  当我们要获取对象时,我们可以关注如下方法:

技术图片
技术图片
    @Override
    public Object get(String name, ObjectFactory<?> objectFactory) 
        BeanLifecycleWrapper value = this.cache.put(name,
                new BeanLifecycleWrapper(name, objectFactory));
        locks.putIfAbsent(name, new ReentrantReadWriteLock());
        try 
            return value.getBean();
        
        catch (RuntimeException e) 
            this.errors.put(name, e);
            throw e;
        
         

//.....  BeanLifecycleWrapper的方法

        public Object getBean() 
            if (this.bean == null) 
                synchronized (this.name) 
                    if (this.bean == null) 
                        this.bean = this.objectFactory.getObject();
                    
                
            
            return this.bean;
                    
技术图片
技术图片
BeanLifecycleWrapper这个是@RefreshScope标记bean的一个包装类,会被存储到缓存里,在这里取不到值的话就会从objectFactory里去拿


三、示例与总结

3.1、示例

  创建AppConfig类代码如下:

技术图片
技术图片
package com.bdqn.lyrk.refresh.scope.server;

import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableConfigurationProperties(StudentConfig.class)
public class AppConfig 

    @RefreshScope
    @Bean
    public Student student(StudentConfig config) 
        Student student = new Student();
        student.setName(config.getName());
        return student;
    
技术图片

  在这里,将Student设置为@RefreshScope 那么刷新以后会获取最新的Bean

  启动类:

技术图片
技术图片
package com.bdqn.lyrk.refresh.scope.server;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class RefreshScopeApplication 

    @Autowired
    private Student student;

    @GetMapping
    public String student() 
        return student.getName();
    

    public static void main(String[] args) throws InterruptedException 

        SpringApplication.run(RefreshScopeApplication.class, args);
    
技术图片

  application.yml文件:

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spring:
  application:
    name: refresh-scope-server
endpoints:
  refresh:
    sensitive: false
server:
  port: 8089
student:
  name: admin
技术图片

   这里把refresh端点开放出来,然后变更配置后就可以获取最新的对象了

 

3.2、总结

  1) 当配置更新并通过refresh端点刷新后,会执行ContextRefresher的refresh方法,该方法会记录当前的Environment,而后构建一个简易的SpringApplicationBuilder并执行其run方法,此时ConfigFileApplicationListener会读取我们修改过后的配置并绑定到SpringApplication对象上,最后进行changes操作来变更已有的PropertySource

  2) @RefreshScope最好配合@Bean使用,当且仅当变更配置后,需要重新获取最新的bean时使用。加上该注解的Bean会被代理并且延迟加载,所有的scope属性为Refresh的bean会被包装成BeanLifecycleWrapper存入缓存(ConcurrentHashMap)中,所有的读取,修改,删除都是基于该缓存的

https://www.cnblogs.com/niechen/p/8979578.html
 
 
 
 
 
 
 
 

原文地址:https://www.cnblogs.com/softidea/p/10427041.html

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