parse

 public void parse(Set<BeanDefinitionHolder> configCandidates) {
        Iterator var2 = configCandidates.iterator();

        while(var2.hasNext()) {
            BeanDefinitionHolder holder = (BeanDefinitionHolder)var2.next();
            BeanDefinition bd = holder.getBeanDefinition();

            try {
                if (bd instanceof AnnotatedBeanDefinition) {
                    this.parse(((AnnotatedBeanDefinition)bd).getMetadata(), holder.getBeanName());
                } else if (bd instanceof AbstractBeanDefinition && ((AbstractBeanDefinition)bd).hasBeanClass()) {
                    this.parse(((AbstractBeanDefinition)bd).getBeanClass(), holder.getBeanName());
                } else {
                    this.parse(bd.getBeanClassName(), holder.getBeanName());
                }
            } catch (BeanDefinitionStoreException var6) {
                throw var6;
            } catch (Throwable var7) {
                throw new BeanDefinitionStoreException("Failed to parse configuration class [" + bd.getBeanClassName() + "]", var7);
            }
        }

        this.deferredImportSelectorHandler.process();
    }
     protected final void parse(AnnotationMetadata metadata, String beanName) throws IOException {
        this.processConfigurationClass(new ConfigurationClass(metadata, beanName));
    }
     protected void processConfigurationClass(ConfigurationClass configClass) throws IOException {
        if (!this.conditionEvaluator.shouldSkip(configClass.getMetadata(), ConfigurationPhase.PARSE_CONFIGURATION)) {
            ConfigurationClass existingClass = (ConfigurationClass)this.configurationClasses.get(configClass);
            if (existingClass != null) {
                if (configClass.isImported()) {
                    if (existingClass.isImported()) {
                        existingClass.mergeImportedBy(configClass);
                    }

                    return;
                }

                this.configurationClasses.remove(configClass);
                this.knownSuperclasses.values().removeIf(configClass::equals);
            }

            ConfigurationClassParser.SourceClass sourceClass = this.asSourceClass(configClass);

            do {
                sourceClass = this.doProcessConfigurationClass(configClass, sourceClass);
            } while(sourceClass != null);

            this.configurationClasses.put(configClass, configClass);
        }
    }
    
     @Nullable
    protected final ConfigurationClassParser.SourceClass doProcessConfigurationClass(ConfigurationClass configClass, ConfigurationClassParser.SourceClass sourceClass) throws IOException {
        if (configClass.getMetadata().isAnnotated(Component.class.getName())) {
            this.processMemberClasses(configClass, sourceClass);
        }

        Iterator var3 = AnnotationConfigUtils.attributesForRepeatable(sourceClass.getMetadata(), PropertySources.class, PropertySource.class).iterator();

        AnnotationAttributes importResource;
        while(var3.hasNext()) {
            importResource = (AnnotationAttributes)var3.next();
            if (this.environment instanceof ConfigurableEnvironment) {
                this.processPropertySource(importResource);
            } else {
                this.logger.info("Ignoring @PropertySource annotation on [" + sourceClass.getMetadata().getClassName() + "]. Reason: Environment must implement ConfigurableEnvironment");
            }
        }
        //这里扫描componentScans,如果没有就是当前包
        Set<AnnotationAttributes> componentScans = AnnotationConfigUtils.attributesForRepeatable(sourceClass.getMetadata(), ComponentScans.class, ComponentScan.class);
        if (!componentScans.isEmpty() && !this.conditionEvaluator.shouldSkip(sourceClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN)) {
            Iterator var13 = componentScans.iterator();

            while(var13.hasNext()) {
                AnnotationAttributes componentScan = (AnnotationAttributes)var13.next();
                Set<BeanDefinitionHolder> scannedBeanDefinitions = this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName());
                Iterator var7 = scannedBeanDefinitions.iterator();

                while(var7.hasNext()) {
                    BeanDefinitionHolder holder = (BeanDefinitionHolder)var7.next();
                    BeanDefinition bdCand = holder.getBeanDefinition().getOriginatingBeanDefinition();
                    if (bdCand == null) {
                        bdCand = holder.getBeanDefinition();
                    }

                    if (ConfigurationClassUtils.checkConfigurationClassCandidate(bdCand, this.metadataReaderFactory)) {
                        this.parse(bdCand.getBeanClassName(), holder.getBeanName());
                    }
                }
            }
        }
        //引入Imports
        this.processImports(configClass, sourceClass, this.getImports(sourceClass), true);
        importResource = AnnotationConfigUtils.attributesFor(sourceClass.getMetadata(), ImportResource.class);
        if (importResource != null) {
            String[] resources = importResource.getStringArray("locations");
            Class<? extends BeanDefinitionReader> readerClass = importResource.getClass("reader");
            String[] var19 = resources;
            int var21 = resources.length;

            for(int var22 = 0; var22 < var21; ++var22) {
                String resource = var19[var22];
                String resolvedResource = this.environment.resolveRequiredPlaceholders(resource);
                configClass.addImportedResource(resolvedResource, readerClass);
            }
        }

        Set<MethodMetadata> beanMethods = this.retrieveBeanMethodMetadata(sourceClass);
        Iterator var17 = beanMethods.iterator();

        while(var17.hasNext()) {
            MethodMetadata methodMetadata = (MethodMetadata)var17.next();
            configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass));
        }

        this.processInterfaces(configClass, sourceClass);
        if (sourceClass.getMetadata().hasSuperClass()) {
            String superclass = sourceClass.getMetadata().getSuperClassName();
            if (superclass != null && !superclass.startsWith("java") && !this.knownSuperclasses.containsKey(superclass)) {
                this.knownSuperclasses.put(superclass, configClass);
                return sourceClass.getSuperClass();
            }
        }

        return null;
    }

processImports

这里大约就是把Import关联的类初始化一下

this.getImports(sourceClass)

 private Set<ConfigurationClassParser.SourceClass> getImports(ConfigurationClassParser.SourceClass sourceClass) throws IOException {
        Set<ConfigurationClassParser.SourceClass> imports = new LinkedHashSet();
        Set<ConfigurationClassParser.SourceClass> visited = new LinkedHashSet();
        this.collectImports(sourceClass, imports, visited);
        //到这里返回了两个
        0 = {ConfigurationClassParser$SourceClass@4694} "org.springframework.boot.autoconfigure.AutoConfigurationPackages$Registrar"
        1 = {ConfigurationClassParser$SourceClass@4695} "org.springframework.boot.autoconfigure.AutoConfigurationImportSelector"
        return imports;
    }

    private void collectImports(ConfigurationClassParser.SourceClass sourceClass, Set<ConfigurationClassParser.SourceClass> imports, Set<ConfigurationClassParser.SourceClass> visited) throws IOException {
        if (visited.add(sourceClass)) {
            Iterator var4 = sourceClass.getAnnotations().iterator();

            while(var4.hasNext()) {
                ConfigurationClassParser.SourceClass annotation = (ConfigurationClassParser.SourceClass)var4.next();
                String annName = annotation.getMetadata().getClassName();
                if (!annName.equals(Import.class.getName())) {
                    this.collectImports(annotation, imports, visited);
                }
            }

            imports.addAll(sourceClass.getAnnotationAttributes(Import.class.getName(), "value"));
        }

    }