标签:toList Spring Boot factory autoconfigure collect orderedStream ObjectProvider cl
springboot 实现了根据classpath下依赖内容自动配置bean到IOC容器,----》Auto configuration(自动配置)
Springboot可以完美配置各种Spring子项目,如Spring mvc,security、data。。。。
springboot auto configuration会尝试推断哪些bean是用户需要的,并进行初始化
Auto configuration原理:
1、通过class标注@configuration,并基于@ConditionalOnClass和OnMissingBean等@Conditional注解的条件过滤,保证springboot满足一定条件下,才会将bean自动注入IOC容器
2、要使用自动配置,首先要添加@EnableAutoConfiguration注解,springboot通过该注解使用给@import注解完成导入配置的功能,配置在META-INFO/spring.factories中定义
// 参考springboot启动原理的笔记 https://www.cnblogs.com/clarino/p/16344346.html
比如ServletWebServerFactoryConfiguration.java定义
@Configuration(proxyBeanMethods = false) class ServletWebServerFactoryConfiguration { @Configuration(proxyBeanMethods = false) @ConditionalOnClass({ Servlet.class, Tomcat.class, UpgradeProtocol.class }) @ConditionalOnMissingBean(value = ServletWebServerFactory.class, search = SearchStrategy.CURRENT) static class EmbeddedTomcat { @Bean TomcatServletWebServerFactory tomcatServletWebServerFactory( ObjectProvider<TomcatConnectorCustomizer> connectorCustomizers, ObjectProvider<TomcatContextCustomizer> contextCustomizers, ObjectProvider<TomcatProtocolHandlerCustomizer<?>> protocolHandlerCustomizers) { TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory(); factory.getTomcatConnectorCustomizers() .addAll(connectorCustomizers.orderedStream().collect(Collectors.toList())); factory.getTomcatContextCustomizers() .addAll(contextCustomizers.orderedStream().collect(Collectors.toList())); factory.getTomcatProtocolHandlerCustomizers() .addAll(protocolHandlerCustomizers.orderedStream().collect(Collectors.toList())); return factory; } } /** * Nested configuration if Jetty is being used. */ @Configuration(proxyBeanMethods = false) @ConditionalOnClass({ Servlet.class, Server.class, Loader.class, WebAppContext.class }) @ConditionalOnMissingBean(value = ServletWebServerFactory.class, search = SearchStrategy.CURRENT) static class EmbeddedJetty { @Bean JettyServletWebServerFactory JettyServletWebServerFactory( ObjectProvider<JettyServerCustomizer> serverCustomizers) { JettyServletWebServerFactory factory = new JettyServletWebServerFactory(); factory.getServerCustomizers().addAll(serverCustomizers.orderedStream().collect(Collectors.toList())); return factory; } } /** * Nested configuration if Undertow is being used. */ @Configuration(proxyBeanMethods = false) @ConditionalOnClass({ Servlet.class, Undertow.class, SslClientAuthMode.class }) @ConditionalOnMissingBean(value = ServletWebServerFactory.class, search = SearchStrategy.CURRENT) static class EmbeddedUndertow { @Bean UndertowServletWebServerFactory undertowServletWebServerFactory( ObjectProvider<UndertowDeploymentInfoCustomizer> deploymentInfoCustomizers, ObjectProvider<UndertowBuilderCustomizer> builderCustomizers) { UndertowServletWebServerFactory factory = new UndertowServletWebServerFactory(); factory.getDeploymentInfoCustomizers() .addAll(deploymentInfoCustomizers.orderedStream().collect(Collectors.toList())); factory.getBuilderCustomizers().addAll(builderCustomizers.orderedStream().collect(Collectors.toList())); return factory; } @Bean UndertowServletWebServerFactoryCustomizer undertowServletWebServerFactoryCustomizer( ServerProperties serverProperties) { return new UndertowServletWebServerFactoryCustomizer(serverProperties); } } }
比如ServletWebServerFactoryAutoConfiguration.java定义
Configuration(proxyBeanMethods = false) @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE) @ConditionalOnClass(ServletRequest.class) @ConditionalOnWebApplication(type = Type.SERVLET) @EnableConfigurationProperties(ServerProperties.class) @Import({ ServletWebServerFactoryAutoConfiguration.BeanPostProcessorsRegistrar.class, ServletWebServerFactoryConfiguration.EmbeddedTomcat.class, ServletWebServerFactoryConfiguration.EmbeddedJetty.class, ServletWebServerFactoryConfiguration.EmbeddedUndertow.class }) public class ServletWebServerFactoryAutoConfiguration { @Bean public ServletWebServerFactoryCustomizer servletWebServerFactoryCustomizer(ServerProperties serverProperties, ObjectProvider<WebListenerRegistrar> webListenerRegistrars) { return new ServletWebServerFactoryCustomizer(serverProperties, webListenerRegistrars.orderedStream().collect(Collectors.toList())); } @Bean @ConditionalOnClass(name = "org.apache.catalina.startup.Tomcat") public TomcatServletWebServerFactoryCustomizer tomcatServletWebServerFactoryCustomizer( ServerProperties serverProperties) { return new TomcatServletWebServerFactoryCustomizer(serverProperties); }
标签:toList,Spring,Boot,factory,autoconfigure,collect,orderedStream,ObjectProvider,cl 来源: https://www.cnblogs.com/clarino/p/16344670.html
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