/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory.config;

import java.beans.PropertyEditor;
import java.security.AccessControlContext;

import org.springframework.beans.PropertyEditorRegistrar;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.beans.TypeConverter;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.HierarchicalBeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.core.convert.ConversionService;
import org.springframework.lang.Nullable;
import org.springframework.util.StringValueResolver;

/**
 * Configuration interface to be implemented by most bean factories. Provides
 * facilities to configure a bean factory, in addition to the bean factory
 * client methods in the {@link org.springframework.beans.factory.BeanFactory}
 * interface.
 *
 * <p>This bean factory interface is not meant to be used in normal application
 * code: Stick to {@link org.springframework.beans.factory.BeanFactory} or
 * {@link org.springframework.beans.factory.ListableBeanFactory} for typical
 * needs. This extended interface is just meant to allow for framework-internal
 * plug'n'play and for special access to bean factory configuration methods.
 *
 * @author Juergen Hoeller
 * @since 03.11.2003
 * @see org.springframework.beans.factory.BeanFactory
 * @see org.springframework.beans.factory.ListableBeanFactory
 * @see ConfigurableListableBeanFactory
 */
public interface ConfigurableBeanFactory extends HierarchicalBeanFactory, SingletonBeanRegistry {

        /**
         * Scope identifier for the standard singleton scope: {@value}.
         * <p>Custom scopes can be added via {@code registerScope}.
         * @see #registerScope
         */
        String SCOPE_SINGLETON = "singleton";

        /**
         * Scope identifier for the standard prototype scope: {@value}.
         * <p>Custom scopes can be added via {@code registerScope}.
         * @see #registerScope
         */
        String SCOPE_PROTOTYPE = "prototype";


        /**
         * Set the parent of this bean factory.
         * <p>Note that the parent cannot be changed: It should only be set outside
         * a constructor if it isn't available at the time of factory instantiation.
         * @param parentBeanFactory the parent BeanFactory
         * @throws IllegalStateException if this factory is already associated with
         * a parent BeanFactory
         * @see #getParentBeanFactory()
         */
        void setParentBeanFactory(BeanFactory parentBeanFactory) throws IllegalStateException;

        /**
         * Set the class loader to use for loading bean classes.
         * Default is the thread context class loader.
         * <p>Note that this class loader will only apply to bean definitions
         * that do not carry a resolved bean class yet. This is the case as of
         * Spring 2.0 by default: Bean definitions only carry bean class names,
         * to be resolved once the factory processes the bean definition.
         * @param beanClassLoader the class loader to use,
         * or {@code null} to suggest the default class loader
         */
        void setBeanClassLoader(@Nullable ClassLoader beanClassLoader);

        /**
         * Return this factory's class loader for loading bean classes
         * (only {@code null} if even the system ClassLoader isn't accessible).
         * @see org.springframework.util.ClassUtils#forName(String, ClassLoader)
         */
        @Nullable
        ClassLoader getBeanClassLoader();

        /**
         * Specify a temporary ClassLoader to use for type matching purposes.
         * Default is none, simply using the standard bean ClassLoader.
         * <p>A temporary ClassLoader is usually just specified if
         * <i>load-time weaving</i> is involved, to make sure that actual bean
         * classes are loaded as lazily as possible. The temporary loader is
         * then removed once the BeanFactory completes its bootstrap phase.
         * @since 2.5
         */
        void setTempClassLoader(@Nullable ClassLoader tempClassLoader);

        /**
         * Return the temporary ClassLoader to use for type matching purposes,
         * if any.
         * @since 2.5
         */
        @Nullable
        ClassLoader getTempClassLoader();

        /**
         * Set whether to cache bean metadata such as given bean definitions
         * (in merged fashion) and resolved bean classes. Default is on.
         * <p>Turn this flag off to enable hot-refreshing of bean definition objects
         * and in particular bean classes. If this flag is off, any creation of a bean
         * instance will re-query the bean class loader for newly resolved classes.
         */
        void setCacheBeanMetadata(boolean cacheBeanMetadata);

        /**
         * Return whether to cache bean metadata such as given bean definitions
         * (in merged fashion) and resolved bean classes.
         */
        boolean isCacheBeanMetadata();

        /**
         * Specify the resolution strategy for expressions in bean definition values.
         * <p>There is no expression support active in a BeanFactory by default.
         * An ApplicationContext will typically set a standard expression strategy
         * here, supporting "#{...}" expressions in a Unified EL compatible style.
         * @since 3.0
         */
        void setBeanExpressionResolver(@Nullable BeanExpressionResolver resolver);

        /**
         * Return the resolution strategy for expressions in bean definition values.
         * @since 3.0
         */
        @Nullable
        BeanExpressionResolver getBeanExpressionResolver();

        /**
         * Specify a Spring 3.0 ConversionService to use for converting
         * property values, as an alternative to JavaBeans PropertyEditors.
         * @since 3.0
         */
        void setConversionService(@Nullable ConversionService conversionService);

        /**
         * Return the associated ConversionService, if any.
         * @since 3.0
         */
        @Nullable
        ConversionService getConversionService();

        /**
         * Add a PropertyEditorRegistrar to be applied to all bean creation processes.
         * <p>Such a registrar creates new PropertyEditor instances and registers them
         * on the given registry, fresh for each bean creation attempt. This avoids
         * the need for synchronization on custom editors; hence, it is generally
         * preferable to use this method instead of {@link #registerCustomEditor}.
         * @param registrar the PropertyEditorRegistrar to register
         */
        void addPropertyEditorRegistrar(PropertyEditorRegistrar registrar);

        /**
         * Register the given custom property editor for all properties of the
         * given type. To be invoked during factory configuration.
         * <p>Note that this method will register a shared custom editor instance;
         * access to that instance will be synchronized for thread-safety. It is
         * generally preferable to use {@link #addPropertyEditorRegistrar} instead
         * of this method, to avoid for the need for synchronization on custom editors.
         * @param requiredType type of the property
         * @param propertyEditorClass the {@link PropertyEditor} class to register
         */
        void registerCustomEditor(Class<?> requiredType, Class<? extends PropertyEditor> propertyEditorClass);

        /**
         * Initialize the given PropertyEditorRegistry with the custom editors
         * that have been registered with this BeanFactory.
         * @param registry the PropertyEditorRegistry to initialize
         */
        void copyRegisteredEditorsTo(PropertyEditorRegistry registry);

        /**
         * Set a custom type converter that this BeanFactory should use for converting
         * bean property values, constructor argument values, etc.
         * <p>This will override the default PropertyEditor mechanism and hence make
         * any custom editors or custom editor registrars irrelevant.
         * @since 2.5
         * @see #addPropertyEditorRegistrar
         * @see #registerCustomEditor
         */
        void setTypeConverter(TypeConverter typeConverter);

        /**
         * Obtain a type converter as used by this BeanFactory. This may be a fresh
         * instance for each call, since TypeConverters are usually <i>not</i> thread-safe.
         * <p>If the default PropertyEditor mechanism is active, the returned
         * TypeConverter will be aware of all custom editors that have been registered.
         * @since 2.5
         */
        TypeConverter getTypeConverter();

        /**
         * Add a String resolver for embedded values such as annotation attributes.
         * @param valueResolver the String resolver to apply to embedded values
         * @since 3.0
         */
        void addEmbeddedValueResolver(StringValueResolver valueResolver);

        /**
         * Determine whether an embedded value resolver has been registered with this
         * bean factory, to be applied through {@link #resolveEmbeddedValue(String)}.
         * @since 4.3
         */
        boolean hasEmbeddedValueResolver();

        /**
         * Resolve the given embedded value, e.g. an annotation attribute.
         * @param value the value to resolve
         * @return the resolved value (may be the original value as-is)
         * @since 3.0
         */
        @Nullable
        String resolveEmbeddedValue(String value);

        /**
         * Add a new BeanPostProcessor that will get applied to beans created
         * by this factory. To be invoked during factory configuration.
         * <p>Note: Post-processors submitted here will be applied in the order of
         * registration; any ordering semantics expressed through implementing the
         * {@link org.springframework.core.Ordered} interface will be ignored. Note
         * that autodetected post-processors (e.g. as beans in an ApplicationContext)
         * will always be applied after programmatically registered ones.
         * @param beanPostProcessor the post-processor to register
         */
        void addBeanPostProcessor(BeanPostProcessor beanPostProcessor);

        /**
         * Return the current number of registered BeanPostProcessors, if any.
         */
        int getBeanPostProcessorCount();

        /**
         * Register the given scope, backed by the given Scope implementation.
         * @param scopeName the scope identifier
         * @param scope the backing Scope implementation
         */
        void registerScope(String scopeName, Scope scope);

        /**
         * Return the names of all currently registered scopes.
         * <p>This will only return the names of explicitly registered scopes.
         * Built-in scopes such as "singleton" and "prototype" won't be exposed.
         * @return the array of scope names, or an empty array if none
         * @see #registerScope
         */
        String[] getRegisteredScopeNames();

        /**
         * Return the Scope implementation for the given scope name, if any.
         * <p>This will only return explicitly registered scopes.
         * Built-in scopes such as "singleton" and "prototype" won't be exposed.
         * @param scopeName the name of the scope
         * @return the registered Scope implementation, or {@code null} if none
         * @see #registerScope
         */
        @Nullable
        Scope getRegisteredScope(String scopeName);

        /**
         * Provides a security access control context relevant to this factory.
         * @return the applicable AccessControlContext (never {@code null})
         * @since 3.0
         */
        AccessControlContext getAccessControlContext();

        /**
         * Copy all relevant configuration from the given other factory.
         * <p>Should include all standard configuration settings as well as
         * BeanPostProcessors, Scopes, and factory-specific internal settings.
         * Should not include any metadata of actual bean definitions,
         * such as BeanDefinition objects and bean name aliases.
         * @param otherFactory the other BeanFactory to copy from
         */
        void copyConfigurationFrom(ConfigurableBeanFactory otherFactory);

        /**
         * Given a bean name, create an alias. We typically use this method to
         * support names that are illegal within XML ids (used for bean names).
         * <p>Typically invoked during factory configuration, but can also be
         * used for runtime registration of aliases. Therefore, a factory
         * implementation should synchronize alias access.
         * @param beanName the canonical name of the target bean
         * @param alias the alias to be registered for the bean
         * @throws BeanDefinitionStoreException if the alias is already in use
         */
        void registerAlias(String beanName, String alias) throws BeanDefinitionStoreException;

        /**
         * Resolve all alias target names and aliases registered in this
         * factory, applying the given StringValueResolver to them.
         * <p>The value resolver may for example resolve placeholders
         * in target bean names and even in alias names.
         * @param valueResolver the StringValueResolver to apply
         * @since 2.5
         */
        void resolveAliases(StringValueResolver valueResolver);

        /**
         * Return a merged BeanDefinition for the given bean name,
         * merging a child bean definition with its parent if necessary.
         * Considers bean definitions in ancestor factories as well.
         * @param beanName the name of the bean to retrieve the merged definition for
         * @return a (potentially merged) BeanDefinition for the given bean
         * @throws NoSuchBeanDefinitionException if there is no bean definition with the given name
         * @since 2.5
         */
        BeanDefinition getMergedBeanDefinition(String beanName) throws NoSuchBeanDefinitionException;

        /**
         * Determine whether the bean with the given name is a FactoryBean.
         * @param name the name of the bean to check
         * @return whether the bean is a FactoryBean
         * ({@code false} means the bean exists but is not a FactoryBean)
         * @throws NoSuchBeanDefinitionException if there is no bean with the given name
         * @since 2.5
         */
        boolean isFactoryBean(String name) throws NoSuchBeanDefinitionException;

        /**
         * Explicitly control the current in-creation status of the specified bean.
         * For container-internal use only.
         * @param beanName the name of the bean
         * @param inCreation whether the bean is currently in creation
         * @since 3.1
         */
        void setCurrentlyInCreation(String beanName, boolean inCreation);

        /**
         * Determine whether the specified bean is currently in creation.
         * @param beanName the name of the bean
         * @return whether the bean is currently in creation
         * @since 2.5
         */
        boolean isCurrentlyInCreation(String beanName);

        /**
         * Register a dependent bean for the given bean,
         * to be destroyed before the given bean is destroyed.
         * @param beanName the name of the bean
         * @param dependentBeanName the name of the dependent bean
         * @since 2.5
         */
        void registerDependentBean(String beanName, String dependentBeanName);

        /**
         * Return the names of all beans which depend on the specified bean, if any.
         * @param beanName the name of the bean
         * @return the array of dependent bean names, or an empty array if none
         * @since 2.5
         */
        String[] getDependentBeans(String beanName);

        /**
         * Return the names of all beans that the specified bean depends on, if any.
         * @param beanName the name of the bean
         * @return the array of names of beans which the bean depends on,
         * or an empty array if none
         * @since 2.5
         */
        String[] getDependenciesForBean(String beanName);

        /**
         * Destroy the given bean instance (usually a prototype instance
         * obtained from this factory) according to its bean definition.
         * <p>Any exception that arises during destruction should be caught
         * and logged instead of propagated to the caller of this method.
         * @param beanName the name of the bean definition
         * @param beanInstance the bean instance to destroy
         */
        void destroyBean(String beanName, Object beanInstance);

        /**
         * Destroy the specified scoped bean in the current target scope, if any.
         * <p>Any exception that arises during destruction should be caught
         * and logged instead of propagated to the caller of this method.
         * @param beanName the name of the scoped bean
         */
        void destroyScopedBean(String beanName);

        /**
         * Destroy all singleton beans in this factory, including inner beans that have
         * been registered as disposable. To be called on shutdown of a factory.
         * <p>Any exception that arises during destruction should be caught
         * and logged instead of propagated to the caller of this method.
         */
        void destroySingletons();

}