abstractapplicationcontext.java

来自「spring framework 2.5.4源代码」· Java 代码 · 共 1,206 行 · 第 1/4 页

	public Class getType(String name) throws NoSuchBeanDefinitionException {
		return getBeanFactory().getType(name);
	}

	public String[] getAliases(String name) {
		return getBeanFactory().getAliases(name);
	}


	//---------------------------------------------------------------------
	// Implementation of ListableBeanFactory interface
	//---------------------------------------------------------------------

	public boolean containsBeanDefinition(String name) {
		return getBeanFactory().containsBeanDefinition(name);
	}

	public int getBeanDefinitionCount() {
		return getBeanFactory().getBeanDefinitionCount();
	}

	public String[] getBeanDefinitionNames() {
		return getBeanFactory().getBeanDefinitionNames();
	}

	public String[] getBeanNamesForType(Class type) {
		return getBeanFactory().getBeanNamesForType(type);
	}

	public String[] getBeanNamesForType(Class type, boolean includePrototypes, boolean allowEagerInit) {
		return getBeanFactory().getBeanNamesForType(type, includePrototypes, allowEagerInit);
	}

	public Map getBeansOfType(Class type) throws BeansException {
		return getBeanFactory().getBeansOfType(type);
	}

	public Map getBeansOfType(Class type, boolean includePrototypes, boolean allowEagerInit)
			throws BeansException {

		return getBeanFactory().getBeansOfType(type, includePrototypes, allowEagerInit);
	}


	//---------------------------------------------------------------------
	// Implementation of HierarchicalBeanFactory interface
	//---------------------------------------------------------------------

	public BeanFactory getParentBeanFactory() {
		return getParent();
	}

	public boolean containsLocalBean(String name) {
		return getBeanFactory().containsLocalBean(name);
	}

	/**
	 * Return the internal bean factory of the parent context if it implements
	 * ConfigurableApplicationContext; else, return the parent context itself.
	 * @see org.springframework.context.ConfigurableApplicationContext#getBeanFactory
	 */
	protected BeanFactory getInternalParentBeanFactory() {
		return (getParent() instanceof ConfigurableApplicationContext) ?
				((ConfigurableApplicationContext) getParent()).getBeanFactory() : (BeanFactory) getParent();
	}


	//---------------------------------------------------------------------
	// Implementation of MessageSource interface
	//---------------------------------------------------------------------

	public String getMessage(String code, Object args[], String defaultMessage, Locale locale) {
		return getMessageSource().getMessage(code, args, defaultMessage, locale);
	}

	public String getMessage(String code, Object args[], Locale locale) throws NoSuchMessageException {
		return getMessageSource().getMessage(code, args, locale);
	}

	public String getMessage(MessageSourceResolvable resolvable, Locale locale) throws NoSuchMessageException {
		return getMessageSource().getMessage(resolvable, locale);
	}

	/**
	 * Return the internal MessageSource used by the context.
	 * @return the internal MessageSource (never <code>null</code>)
	 * @throws IllegalStateException if the context has not been initialized yet
	 */
	private MessageSource getMessageSource() throws IllegalStateException {
		if (this.messageSource == null) {
			throw new IllegalStateException("MessageSource not initialized - " +
					"call 'refresh' before accessing messages via the context: " + this);
		}
		return this.messageSource;
	}

	/**
	 * Return the internal message source of the parent context if it is an
	 * AbstractApplicationContext too; else, return the parent context itself.
	 */
	protected MessageSource getInternalParentMessageSource() {
		return (getParent() instanceof AbstractApplicationContext) ?
		    ((AbstractApplicationContext) getParent()).messageSource : getParent();
	}


	//---------------------------------------------------------------------
	// Implementation of ResourcePatternResolver interface
	//---------------------------------------------------------------------

	public Resource[] getResources(String locationPattern) throws IOException {
		return this.resourcePatternResolver.getResources(locationPattern);
	}


	//---------------------------------------------------------------------
	// Implementation of Lifecycle interface
	//---------------------------------------------------------------------

	public void start() {
		Map lifecycleBeans = getLifecycleBeans();
		for (Iterator it = new LinkedHashSet(lifecycleBeans.keySet()).iterator(); it.hasNext();) {
			String beanName = (String) it.next();
			doStart(lifecycleBeans, beanName);
		}
		publishEvent(new ContextStartedEvent(this));
	}

	public void stop() {
		Map lifecycleBeans = getLifecycleBeans();
		for (Iterator it = new LinkedHashSet(lifecycleBeans.keySet()).iterator(); it.hasNext();) {
			String beanName = (String) it.next();
			doStop(lifecycleBeans, beanName);
		}
		publishEvent(new ContextStoppedEvent(this));
	}

	public boolean isRunning() {
		Iterator it = getLifecycleBeans().values().iterator();
		while (it.hasNext()) {
			Lifecycle lifecycle = (Lifecycle) it.next();
			if (!lifecycle.isRunning()) {
				return false;
			}
		}
		return true;
	}

	/**
	 * Return a Map of all singleton beans that implement the
	 * Lifecycle interface in this context.
	 * @return Map of Lifecycle beans with bean name as key
	 */
	private Map getLifecycleBeans() {
		ConfigurableListableBeanFactory beanFactory = getBeanFactory();
		String[] beanNames = beanFactory.getSingletonNames();
		Map beans = new LinkedHashMap();
		for (int i = 0; i < beanNames.length; i++) {
			Object bean = beanFactory.getSingleton(beanNames[i]);
			if (bean instanceof Lifecycle) {
				beans.put(beanNames[i], bean);
			}
		}
		return beans;
	}

	/**
	 * Start the specified bean as part of the given set of Lifecycle beans,
	 * making sure that any beans that it depends on are started first.
	 * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
	 * @param beanName the name of the bean to start
	 */
	private void doStart(Map lifecycleBeans, String beanName) {
		Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
		if (bean != null) {
			String[] dependenciesForBean = getBeanFactory().getDependenciesForBean(beanName);
			for (int i = 0; i < dependenciesForBean.length; i++) {
				doStart(lifecycleBeans, dependenciesForBean[i]);
			}
			if (!bean.isRunning()) {
				bean.start();
			}
			lifecycleBeans.remove(beanName);
		}
	}

	/**
	 * Stop the specified bean as part of the given set of Lifecycle beans,
	 * making sure that any beans that depends on it are stopped first.
	 * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
	 * @param beanName the name of the bean to stop
	 */
	private void doStop(Map lifecycleBeans, String beanName) {
		Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
		if (bean != null) {
			String[] dependentBeans = getBeanFactory().getDependentBeans(beanName);
			for (int i = 0; i < dependentBeans.length; i++) {
				doStop(lifecycleBeans, dependentBeans[i]);
			}
			if (bean.isRunning()) {
				bean.stop();
			}
			lifecycleBeans.remove(beanName);
		}
	}


	//---------------------------------------------------------------------
	// Abstract methods that must be implemented by subclasses
	//---------------------------------------------------------------------

	/**
	 * Subclasses must implement this method to perform the actual configuration load.
	 * The method is invoked by {@link #refresh()} before any other initialization work.
	 * <p>A subclass will either create a new bean factory and hold a reference to it,
	 * or return a single BeanFactory instance that it holds. In the latter case, it will
	 * usually throw an IllegalStateException if refreshing the context more than once.
	 * @throws BeansException if initialization of the bean factory failed
	 * @throws IllegalStateException if already initialized and multiple refresh
	 * attempts are not supported
	 */
	protected abstract void refreshBeanFactory() throws BeansException, IllegalStateException;

	/**
	 * Subclasses must implement this method to release their internal bean factory.
	 * This method gets invoked by {@link #close()} after all other shutdown work.
	 * <p>Should never throw an exception but rather log shutdown failures.
	 */
	protected abstract void closeBeanFactory();

	/**
	 * Subclasses must return their internal bean factory here. They should implement the
	 * lookup efficiently, so that it can be called repeatedly without a performance penalty.
	 * <p>Note: Subclasses should check whether the context is still active before
	 * returning the internal bean factory. The internal factory should generally be
	 * considered unavailable once the context has been closed.
	 * @return this application context's internal bean factory (never <code>null</code>)
	 * @throws IllegalStateException if the context does not hold an internal bean factory yet
	 * (usually if {@link #refresh()} has never been called) or if the context has been
	 * closed already
	 * @see #refreshBeanFactory()
	 * @see #closeBeanFactory()
	 */
	public abstract ConfigurableListableBeanFactory getBeanFactory() throws IllegalStateException;


	/**
	 * Return information about this context.
	 */
	public String toString() {
		StringBuffer sb = new StringBuffer(getId());
		sb.append(": display name [").append(getDisplayName());
		sb.append("]; startup date [").append(new Date(getStartupDate()));
		sb.append("]; ");
		ApplicationContext parent = getParent();
		if (parent == null) {
			sb.append("root of context hierarchy");
		}
		else {
			sb.append("parent: ").append(parent.getId());
		}
		return sb.toString();
	}


	/**
	 * BeanPostProcessor that logs an info message when a bean is created during
	 * BeanPostProcessor instantiation, i.e. when a bean is not eligible for
	 * getting processed by all BeanPostProcessors.
	 */
	private class BeanPostProcessorChecker implements BeanPostProcessor {

		private final ConfigurableListableBeanFactory beanFactory;

		private final int beanPostProcessorTargetCount;

		public BeanPostProcessorChecker(ConfigurableListableBeanFactory beanFactory, int beanPostProcessorTargetCount) {
			this.beanFactory = beanFactory;
			this.beanPostProcessorTargetCount = beanPostProcessorTargetCount;
		}

		public Object postProcessBeforeInitialization(Object bean, String beanName) {
			return bean;
		}

		public Object postProcessAfterInitialization(Object bean, String beanName) {
			if (!(bean instanceof BeanPostProcessor) &&
					this.beanFactory.getBeanPostProcessorCount() < this.beanPostProcessorTargetCount) {
				if (logger.isInfoEnabled()) {
					logger.info("Bean '" + beanName + "' is not eligible for getting processed by all " +
							"BeanPostProcessors (for example: not eligible for auto-proxying)");
				}
			}
			return bean;
		}
	}

}