Class ClassPathBeanDefinitionScanner

java.lang.Object
org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider
org.springframework.context.annotation.ClassPathBeanDefinitionScanner
All Implemented Interfaces:
Aware, ResourceLoaderAware, EnvironmentCapable
public class ClassPathBeanDefinitionScanner extends ClassPathScanningCandidateComponentProvider
A bean definition scanner that detects bean candidates on the classpath, registering corresponding bean definitions with a given registry (BeanFactory or ApplicationContext).

Candidate classes are detected through configurable type filters. The default filters include classes that are annotated with Spring's @Component, @Repository, @Service, or @Controller stereotype.

Also supports JSR-330's Named annotations, if available.

Since:
2.5
Author:
Mark Fisher, Juergen Hoeller, Chris Beams
See Also:

  • Constructor Details

  • Method Details

    • getRegistry

      public final BeanDefinitionRegistry getRegistry()
      Return the BeanDefinitionRegistry that this scanner operates on.
      Overrides:
      getRegistry in class ClassPathScanningCandidateComponentProvider

    • setBeanDefinitionDefaults

      public void setBeanDefinitionDefaults(@Nullable BeanDefinitionDefaults beanDefinitionDefaults)
      Set the defaults to use for detected beans.
      See Also:

    • getBeanDefinitionDefaults

      public BeanDefinitionDefaults getBeanDefinitionDefaults()
      Return the defaults to use for detected beans (never null).
      Since:
      4.1

    • setAutowireCandidatePatterns

      public void setAutowireCandidatePatterns(String @Nullable ... autowireCandidatePatterns)
      Set the name-matching patterns for determining autowire candidates.
      Parameters:
      autowireCandidatePatterns - the patterns to match against

    • setBeanNameGenerator

      public void setBeanNameGenerator(@Nullable BeanNameGenerator beanNameGenerator)
      Set the BeanNameGenerator to use for detected bean classes.

      Default is a AnnotationBeanNameGenerator.

    • setScopeMetadataResolver

      public void setScopeMetadataResolver(@Nullable ScopeMetadataResolver scopeMetadataResolver)
      Set the ScopeMetadataResolver to use for detected bean classes. Note that this will override any custom "scopedProxyMode" setting.

      The default is an AnnotationScopeMetadataResolver.

      See Also:

    • setScopedProxyMode

      public void setScopedProxyMode(ScopedProxyMode scopedProxyMode)
      Specify the proxy behavior for non-singleton scoped beans. Note that this will override any custom "scopeMetadataResolver" setting.

      The default is ScopedProxyMode.NO.

      See Also:

    • setIncludeAnnotationConfig

      public void setIncludeAnnotationConfig(boolean includeAnnotationConfig)
      Specify whether to register annotation config post-processors.

      The default is to register the post-processors. Turn this off to be able to ignore the annotations or to process them differently.

    • scan

      public int scan(String... basePackages)
      Perform a scan within the specified base packages.
      Parameters:
      basePackages - the packages to check for annotated classes
      Returns:
      number of beans registered

    • doScan

      protected Set<BeanDefinitionHolder> doScan(String... basePackages)
      Perform a scan within the specified base packages, returning the registered bean definitions.

      This method does not register an annotation config processor but rather leaves this up to the caller.

      Parameters:
      basePackages - the packages to check for annotated classes
      Returns:
      set of beans registered if any for tooling registration purposes (never null)

    • postProcessBeanDefinition

      protected void postProcessBeanDefinition(AbstractBeanDefinition beanDefinition, String beanName)
      Apply further settings to the given bean definition, beyond the contents retrieved from scanning the component class.
      Parameters:
      beanDefinition - the scanned bean definition
      beanName - the generated bean name for the given bean

    • registerBeanDefinition

      protected void registerBeanDefinition(BeanDefinitionHolder definitionHolder, BeanDefinitionRegistry registry)
      Register the specified bean with the given registry.

      Can be overridden in subclasses, for example, to adapt the registration process or to register further bean definitions for each scanned bean.

      Parameters:
      definitionHolder - the bean definition plus bean name for the bean
      registry - the BeanDefinitionRegistry to register the bean with

    • checkCandidate

      protected boolean checkCandidate(String beanName, BeanDefinition beanDefinition) throws IllegalStateException
      Check the given candidate's bean name, determining whether the corresponding bean definition needs to be registered or conflicts with an existing definition.
      Parameters:
      beanName - the suggested name for the bean
      beanDefinition - the corresponding bean definition
      Returns:
      true if the bean can be registered as-is; false if it should be skipped because there is an existing, compatible bean definition for the specified name
      Throws:
      IllegalStateException - if an existing, incompatible bean definition has been found for the specified name

    • isCompatible

      protected boolean isCompatible(BeanDefinition newDef, BeanDefinition existingDef)
      Determine whether the given new bean definition is compatible with the given existing bean definition.

      The default implementation considers them as compatible when the existing bean definition comes from the same source or from a non-scanning source.

      Parameters:
      newDef - the new bean definition, originated from scanning
      existingDef - the existing bean definition, potentially an explicitly defined one or a previously generated one from scanning
      Returns:
      whether the definitions are considered as compatible, with the new definition to be skipped in favor of the existing definition