SpringBoot application 文件加载过程源码赏析

电玩女神 2022-12-26 07:28 15阅读 0赞

## ConfigFileApplicationListener ##

配置文件监听器

protected void addPropertySources(ConfigurableEnvironment environment, ResourceLoader resourceLoader) { 
    		RandomValuePropertySource.addToEnvironment(environment);
    		// 加载器加载信息
    		new Loader(environment, resourceLoader).load();
    	}

## Loader ##

配置资源加载器  
构造方法

Loader(ConfigurableEnvironment environment, ResourceLoader resourceLoader) { 
    		    // 环境配置
    			this.environment = environment;
    			// 占位符处理器
    			this.placeholdersResolver = new PropertySourcesPlaceholdersResolver(this.environment);
    			// 资源加载器
    			this.resourceLoader = (resourceLoader != null) ? resourceLoader : new DefaultResourceLoader();
    			// 配置信息加载器初始化
    			this.propertySourceLoaders = SpringFactoriesLoader.loadFactories(PropertySourceLoader.class,
    					getClass().getClassLoader());
    		}

## load 方法 ##

void load() { 
    			FilteredPropertySource.apply(this.environment, DEFAULT_PROPERTIES, LOAD_FILTERED_PROPERTY,
    					(defaultProperties) -> { 
    						this.profiles = new LinkedList<>();
    						this.processedProfiles = new LinkedList<>();
    						this.activatedProfiles = false;
    						this.loaded = new LinkedHashMap<>();
    						// 初始化配置文件
    						initializeProfiles();
    						while (!this.profiles.isEmpty()) { 
    							Profile profile = this.profiles.poll();
    							if (isDefaultProfile(profile)) { 
    								addProfileToEnvironment(profile.getName());
    							}
    							load(profile, this::getPositiveProfileFilter,
    									addToLoaded(MutablePropertySources::addLast, false));
    							this.processedProfiles.add(profile);
    						}
    						load(null, this::getNegativeProfileFilter, addToLoaded(MutablePropertySources::addFirst, true));
    						addLoadedPropertySources();
    						applyActiveProfiles(defaultProperties);
    					});
    		}

## initializeProfiles ##

private void load(Profile profile, DocumentFilterFactory filterFactory, DocumentConsumer consumer) { 
    			getSearchLocations().forEach(
    					// 本地路径
    					(location) -> { 
    						// 是不是文件夹
    						boolean isFolder = location.endsWith("/");
    						// 文件名,默认application
    						Set<String> names = isFolder ? getSearchNames() : NO_SEARCH_NAMES;
    						// 循环加载
    						names.forEach((name) -> { 
    							load(location, name, profile, filterFactory, consumer);
    						});
    					});
    		}