spring中的ObjectPostProcessor详解

@Override
protected void configure(HttpSecurity http) throws Exception {
	http
		.authorizeRequests()
			.anyRequest().authenticated()
			.withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
				public <O extends FilterSecurityInterceptor> O postProcess(
						O fsi) {
					fsi.setPublishAuthorizationSuccess(true);
					return fsi;
				}
			});
}

Class ObjectEg implements InitializingBean{
    @Autowire
 	private Person person;
    public void afterPropertiesSet() {
		log.info(person.getName())；
	}
}

@Configuration(proxyBeanMethods = false)
public class ObjectPostProcessorConfiguration {
	@Bean
	public ObjectPostProcessor<Object> objectPostProcessor(
			AutowireCapableBeanFactory beanFactory) {
		return new AutowireBeanFactoryObjectPostProcessor(beanFactory);
	}
}

final class AutowireBeanFactoryObjectPostProcessor
		implements ObjectPostProcessor<Object>, DisposableBean, SmartInitializingSingleton {
	private final Log logger = LogFactory.getLog(getClass());
	private final AutowireCapableBeanFactory autowireBeanFactory;
	private final List<DisposableBean> disposableBeans = new ArrayList<>();
	private final List<SmartInitializingSingleton> smartSingletons = new ArrayList<>();
	AutowireBeanFactoryObjectPostProcessor(
			AutowireCapableBeanFactory autowireBeanFactory) {
		Assert.notNull(autowireBeanFactory, "autowireBeanFactory cannot be null");
		this.autowireBeanFactory = autowireBeanFactory;
	}
	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * org.springframework.security.config.annotation.web.Initializer#initialize(java.
	 * lang.Object)
	 */
	@SuppressWarnings("unchecked")
	public <T> T postProcess(T object) {
		if (object == null) {
			return null;
		}
		T result = null;
		try {
			result = (T) this.autowireBeanFactory.initializeBean(object,
					object.toString());
		}
		catch (RuntimeException e) {
			Class<?> type = object.getClass();
			throw new RuntimeException(
					"Could not postProcess " + object + " of type " + type, e);
		}
		this.autowireBeanFactory.autowireBean(object);
		if (result instanceof DisposableBean) {
			this.disposableBeans.add((DisposableBean) result);
		}
		if (result instanceof SmartInitializingSingleton) {
			this.smartSingletons.add((SmartInitializingSingleton) result);
		}
		return result;
	}
	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.SmartInitializingSingleton#afterSingletonsInstantiated()
	 */
	@Override
	public void afterSingletonsInstantiated() {
		for (SmartInitializingSingleton singleton : smartSingletons) {
			singleton.afterSingletonsInstantiated();
		}
	}
	/*
	 * (non-Javadoc)
	 *
	 * @see org.springframework.beans.factory.DisposableBean#destroy()
	 */
	public void destroy() {
		for (DisposableBean disposable : this.disposableBeans) {
			try {
				disposable.destroy();
			}
			catch (Exception error) {
				this.logger.error(error);
			}
		}
	}
}

@Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)
@Target(value = { java.lang.annotation.ElementType.TYPE })
@Documented
@Import({ WebSecurityConfiguration.class,
		SpringWebMvcImportSelector.class,
		OAuth2ImportSelector.class })
@EnableGlobalAuthentication
@Configuration
public @interface EnableWebSecurity {
	/**
	 * Controls debugging support for Spring Security. Default is false.
	 * @return if true, enables debug support with Spring Security
	 */
	boolean debug() default false;
}

/**
	 * Sets the {@code <SecurityConfigurer<FilterChainProxy, WebSecurityBuilder>}
	 * instances used to create the web configuration.
	 *
	 * @param objectPostProcessor the {@link ObjectPostProcessor} used to create a
	 * {@link WebSecurity} instance
	 * @param webSecurityConfigurers the
	 * {@code <SecurityConfigurer<FilterChainProxy, WebSecurityBuilder>} instances used to
	 * create the web configuration
	 * @throws Exception
	 */
	@Autowired(required = false)
	public void setFilterChainProxySecurityConfigurer(
			ObjectPostProcessor<Object> objectPostProcessor,
			@Value("#{@autowiredWebSecurityConfigurersIgnoreParents.getWebSecurityConfigurers()}") List<SecurityConfigurer<Filter, WebSecurity>> webSecurityConfigurers)
			throws Exception {
		//自动创建了一个WebSecurity，处理内部的注入依赖，通过objectPostProcessor处理 AutowireBeanFactoryObjectPostProcessor
		webSecurity = objectPostProcessor
				.postProcess(new WebSecurity(objectPostProcessor));
		if (debugEnabled != null) {
			webSecurity.debug(debugEnabled);
		}
		webSecurityConfigurers.sort(AnnotationAwareOrderComparator.INSTANCE);
		Integer previousOrder = null;
		Object previousConfig = null;
		for (SecurityConfigurer<Filter, WebSecurity> config : webSecurityConfigurers) {
			Integer order = AnnotationAwareOrderComparator.lookupOrder(config);
			if (previousOrder != null && previousOrder.equals(order)) {
				throw new IllegalStateException(
						"@Order on WebSecurityConfigurers must be unique. Order of "
								+ order + " was already used on " + previousConfig + ", so it cannot be used on "
								+ config + " too.");
			}
			previousOrder = order;
			previousConfig = config;
		}
		for (SecurityConfigurer<Filter, WebSecurity> webSecurityConfigurer : webSecurityConfigurers) {
			webSecurity.apply(webSecurityConfigurer);
		}
		this.webSecurityConfigurers = webSecurityConfigurers;
	}

/**
	 * Creates the Spring Security Filter Chain
	 * @return the {@link Filter} that represents the security filter chain
	 * @throws Exception
	 */
	@Bean(name = AbstractSecurityWebApplicationInitializer.DEFAULT_FILTER_NAME)
	public Filter springSecurityFilterChain() throws Exception {
		boolean hasConfigurers = webSecurityConfigurers != null
				&& !webSecurityConfigurers.isEmpty();
		if (!hasConfigurers) {
			//新创建一个WebSecurityConfigurerAdapter 然后使用objectObjectPostProcessor，自动配置初始化信息
			// AutowireBeanFactoryObjectPostProcessor
			WebSecurityConfigurerAdapter adapter = objectObjectPostProcessor
					.postProcess(new WebSecurityConfigurerAdapter() {
					});
			webSecurity.apply(adapter);
		}
        //这里是整个过滤链条创建的入口哦
		return webSecurity.build();
	}

   @Configuration
   @EnableWebSecurity
   public class MyWebSecurityConfiguration extends WebSecurityConfigurerAdapter {
   	@Override
   	public void configure(WebSecurity web) throws Exception {
   		web.ignoring()
   		// Spring Security should completely ignore URLs starting with /resources/
   				.antMatchers("/resources/**");
   	}
   	@Override
   	protected void configure(HttpSecurity http) throws Exception {
   		http.authorizeRequests().antMatchers("/public/**").permitAll().anyRequest()
   				.hasRole("USER").and()
   				// Possibly more configuration ...
   				.formLogin() // enable form based log in
   				// set permitAll for all URLs associated with Form Login
   				.permitAll();
   	}
   	@Override
   	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
   		auth
   		// enable in memory based authentication with a user named "user" and "admin"
   		.inMemoryAuthentication().withUser("user").password("password").roles("USER")
   				.and().withUser("admin").password("password").roles("USER", "ADMIN");
   	}
   	// Possibly more overridden methods ...
   }