SpringBoot Profile源码介绍

进入上一篇使用profile的load()方法（ConfigFileApplicationListener类中）

1、initializeProfiles();

1）进入initializeProfiles方法。初始化Profiles，将所有的profile增加到prifiles集合中

		private void initializeProfiles() {
			// The default profile for these purposes is represented as null. We add it
			// first so that it is processed first and has lowest priority.
			this.profiles.add(null);
			Set<Profile> activatedViaProperty = getProfilesActivatedViaProperty();
			this.profiles.addAll(getOtherActiveProfiles(activatedViaProperty));
			// Any pre-existing active profiles set via property sources (e.g.
			// System properties) take precedence over those added in config files.
			addActiveProfiles(activatedViaProperty);
			if (this.profiles.size() == 1) { // only has null profile
				for (String defaultProfileName : this.environment.getDefaultProfiles()) {
					Profile defaultProfile = new Profile(defaultProfileName, true);
					this.profiles.add(defaultProfile);
				}
			}
		}

　　

2、load(profile, this::getPositiveProfileFilter, addToLoaded(MutablePropertySources::addLast, false));

遍历prifles，

第一个prifile为空，进入load方法

	private void load(Profile profile, DocumentFilterFactory filterFactory, DocumentConsumer consumer) {
			getSearchLocations().forEach((location) -> {
				boolean isFolder = location.endsWith("/");
				Set<String> names = isFolder ? getSearchNames() : NO_SEARCH_NAMES;
				names.forEach((name) -> load(location, name, profile, filterFactory, consumer));
			});
		}

　

进入getSearchLocations方法，获得如下图，classpath:/等查询路径

 然后遍历上一步获取的查询路径

 进入names.forEach((name) -> load(location, name, profile, filterFactory, consumer))的load方法，name值为application

然后进入loadForFileExtension(loader, location + name, "." + fileExtension, profile, filterFactory,      consumer);

 

 最终进入load(loader, prefix + fileExtension, profile, profileFilter, consumer);这个方法

private void load(PropertySourceLoader loader, String location, Profile profile, DocumentFilter filter,
				DocumentConsumer consumer) {
			try {
				Resource resource = this.resourceLoader.getResource(location);
				if (resource == null || !resource.exists()) {
					if (this.logger.isTraceEnabled()) {
						StringBuilder description = getDescription("Skipped missing config ", location, resource,
								profile);
						this.logger.trace(description);
					}
					return;
				}
				if (!StringUtils.hasText(StringUtils.getFilenameExtension(resource.getFilename()))) {
					if (this.logger.isTraceEnabled()) {
						StringBuilder description = getDescription("Skipped empty config extension ", location,
								resource, profile);
						this.logger.trace(description);
					}
					return;
				}
				String name = "applicationConfig: [" + location + "]";
				List<Document> documents = loadDocuments(loader, name, resource);
				if (CollectionUtils.isEmpty(documents)) {
					if (this.logger.isTraceEnabled()) {
						StringBuilder description = getDescription("Skipped unloaded config ", location, resource,
								profile);
						this.logger.trace(description);
					}
					return;
				}
				List<Document> loaded = new ArrayList<>();
				for (Document document : documents) {
					if (filter.match(document)) {
						addActiveProfiles(document.getActiveProfiles());
						addIncludedProfiles(document.getIncludeProfiles());
						loaded.add(document);
					}
				}
				Collections.reverse(loaded);
				if (!loaded.isEmpty()) {
					loaded.forEach((document) -> consumer.accept(profile, document));
					if (this.logger.isDebugEnabled()) {
						StringBuilder description = getDescription("Loaded config file ", location, resource, profile);
						this.logger.debug(description);
					}
				}
			}
			catch (Exception ex) {
				throw new IllegalStateException("Failed to load property " + "source from location '" + location + "'",
						ex);
			}
		}

　　

然后进入List<Document> documents = loadDocuments(loader, name, resource);

private List<Document> loadDocuments(PropertySourceLoader loader, String name, Resource resource)
				throws IOException {
			DocumentsCacheKey cacheKey = new DocumentsCacheKey(loader, resource);
			List<Document> documents = this.loadDocumentsCache.get(cacheKey);
			if (documents == null) {
				List<PropertySource<?>> loaded = loader.load(name, resource);
				documents = asDocuments(loaded);
				this.loadDocumentsCache.put(cacheKey, documents);
			}
			return documents;
		}

　　

进入List<PropertySource<?>> loaded = loader.load(name, resource); 加载后的属性如下图所示

 

3、resetEnvironmentProfiles(this.processedProfiles);

设置激活的prifile有哪些

		private void resetEnvironmentProfiles(List<Profile> processedProfiles) {
			String[] names = processedProfiles.stream()
					.filter((profile) -> profile != null && !profile.isDefaultProfile()).map(Profile::getName)
					.toArray(String[]::new);
			this.environment.setActiveProfiles(names);
		}

　　

4、load(null, this::getNegativeProfileFilter, addToLoaded(MutablePropertySources::addFirst, true));

防止前面循环没有进入，load默认的profile

5、addLoadedPropertySources(); 将获得的profile的属性增加到属性源中

	private void addLoadedPropertySources() {
			MutablePropertySources destination = this.environment.getPropertySources();
			List<MutablePropertySources> loaded = new ArrayList<>(this.loaded.values());
			Collections.reverse(loaded);
			String lastAdded = null;
			Set<String> added = new HashSet<>();
			for (MutablePropertySources sources : loaded) {
				for (PropertySource<?> source : sources) {
					if (added.add(source.getName())) {
						addLoadedPropertySource(destination, lastAdded, source);
						lastAdded = source.getName();
					}
				}
			}
		}

　　如下图所示