程序包 cn.taketoday.core.env

接口 ConfigurableEnvironment

所有超级接口:
ConfigurablePropertyResolver, Environment, PropertyResolver
所有已知实现类:
AbstractEnvironment, StandardEnvironment
public interface ConfigurableEnvironment extends Environment, ConfigurablePropertyResolver
Configuration interface to be implemented by most if not all Environment types. Provides facilities for setting active and default profiles and manipulating underlying property sources. Allows clients to set and validate required properties, customize the conversion service and more through the ConfigurablePropertyResolver superinterface.

Manipulating property sources

Property sources may be removed, reordered, or replaced; and additional property sources may be added using the PropertySources instance returned from getPropertySources(). The following examples are against the StandardEnvironment implementation of ConfigurableEnvironment, but are generally applicable to any implementation, though particular default property sources may differ.

Example: adding a new property source with highest search priority

 ConfigurableEnvironment environment = new StandardEnvironment();
 PropertySources propertySources = environment.getPropertySources();
 Map<String, String> myMap = new HashMap<>();
 myMap.put("xyz", "myValue");
 propertySources.addFirst(new MapPropertySource("MY_MAP", myMap));

Example: removing the default system properties property source

 PropertySources propertySources = environment.getPropertySources();
 propertySources.remove(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME)

Example: mocking the system environment for testing purposes

 PropertySources propertySources = environment.getPropertySources();
 MockPropertySource mockEnvVars = new MockPropertySource().withProperty("xyz", "myValue");
 propertySources.replace(StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, mockEnvVars);
When an Environment is being used by an ApplicationContext, it is important that any such PropertySource manipulations be performed before the context's refresh() method is called. This ensures that all property sources are available during the container bootstrap process.
从以下版本开始:
4.0
作者:
Chris Beams
另请参阅:

  • 方法详细资料

    • setActiveProfiles

      void setActiveProfiles(String... profiles)
      Specify the set of profiles active for this Environment. Profiles are evaluated during container bootstrap to determine whether bean definitions should be registered with the container.

      Any existing active profiles will be replaced with the given arguments; call with zero arguments to clear the current set of active profiles. Use addActiveProfile(java.lang.String) to add a profile while preserving the existing set.

      抛出:
      IllegalArgumentException - if any profile is null, empty or whitespace-only
      另请参阅:

    • addActiveProfile

      void addActiveProfile(String profile)
      Add a profile to the current set of active profiles.
      抛出:
      IllegalArgumentException - if the profile is null, empty or whitespace-only
      另请参阅:

    • setDefaultProfiles

      void setDefaultProfiles(String... profiles)
      Specify the set of profiles to be made active by default if no other profiles are explicitly made active through setActiveProfiles(java.lang.String...).
      抛出:
      IllegalArgumentException - if any profile is null, empty or whitespace-only
      另请参阅:

    • getPropertySources

      PropertySources getPropertySources()
      Return the PropertySources for this Environment in mutable form, allowing for manipulation of the set of PropertySource objects that should be searched when resolving properties against this Environment object. The various PropertySources methods such as addFirst, addLast, addBefore and addAfter allow for fine-grained control over property source ordering. This is useful, for example, in ensuring that certain user-defined property sources have search precedence over default property sources such as the set of system properties or the set of system environment variables.
      另请参阅:

    • getSystemProperties

      Map<String,Object> getSystemProperties()
      Return the value of System.getProperties().

      Note that most Environment implementations will include this system properties map as a default PropertySource to be searched. Therefore, it is recommended that this method not be used directly unless bypassing other property sources is expressly intended.

    • getSystemEnvironment

      Map<String,Object> getSystemEnvironment()
      Return the value of System.getenv().

      Note that most Environment implementations will include this system environment map as a default PropertySource to be searched. Therefore, it is recommended that this method not be used directly unless bypassing other property sources is expressly intended.

    • merge

      void merge(ConfigurableEnvironment parent)
      Append the given parent environment's active profiles, default profiles and property sources to this (child) environment's respective collections of each.

      For any identically-named PropertySource instance existing in both parent and child, the child instance is to be preserved and the parent instance discarded. This has the effect of allowing overriding of property sources by the child as well as avoiding redundant searches through common property source types, e.g. system environment and system properties.

      Active and default profile names are also filtered for duplicates, to avoid confusion and redundant storage.

      The parent environment remains unmodified in any case. Note that any changes to the parent environment occurring after the call to merge will not be reflected in the child. Therefore, care should be taken to configure parent property sources and profile information prior to calling merge.

      参数:
      parent - the environment to merge with
      另请参阅:
      • cn.taketoday.context.support.AbstractApplicationContext#setParent