org.springframework.context.ConfigurableApplicationContext#isActive ( )源码实例Demo

/**
 * Return the {@code WebApplicationContext} passed in at construction time, if available.
 * Otherwise, attempt to retrieve a {@code WebApplicationContext} from the
 * {@code ServletContext} attribute with the {@linkplain #setContextAttribute
 * configured name} if set. Otherwise look up a {@code WebApplicationContext} under
 * the well-known "root" application context attribute. The
 * {@code WebApplicationContext} must have already been loaded and stored in the
 * {@code ServletContext} before this filter gets initialized (or invoked).
 * <p>Subclasses may override this method to provide a different
 * {@code WebApplicationContext} retrieval strategy.
 * @return the {@code WebApplicationContext} for this proxy, or {@code null} if not found
 * @see #DelegatingFilterProxy(String, WebApplicationContext)
 * @see #getContextAttribute()
 * @see WebApplicationContextUtils#getWebApplicationContext(javax.servlet.ServletContext)
 * @see WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
 */
@Nullable
protected WebApplicationContext findWebApplicationContext() {
	if (this.webApplicationContext != null) {
		// The user has injected a context at construction time -> use it...
		if (this.webApplicationContext instanceof ConfigurableApplicationContext) {
			ConfigurableApplicationContext cac = (ConfigurableApplicationContext) this.webApplicationContext;
			if (!cac.isActive()) {
				// The context has not yet been refreshed -> do so before returning it...
				cac.refresh();
			}
		}
		return this.webApplicationContext;
	}
	String attrName = getContextAttribute();
	if (attrName != null) {
		return WebApplicationContextUtils.getWebApplicationContext(getServletContext(), attrName);
	}
	else {
		return WebApplicationContextUtils.findWebApplicationContext(getServletContext());
	}
}
 

/**
 * Return the {@code WebApplicationContext} passed in at construction time, if available.
 * Otherwise, attempt to retrieve a {@code WebApplicationContext} from the
 * {@code ServletContext} attribute with the {@linkplain #setContextAttribute
 * configured name} if set. Otherwise look up a {@code WebApplicationContext} under
 * the well-known "root" application context attribute. The
 * {@code WebApplicationContext} must have already been loaded and stored in the
 * {@code ServletContext} before this filter gets initialized (or invoked).
 * <p>Subclasses may override this method to provide a different
 * {@code WebApplicationContext} retrieval strategy.
 * @return the {@code WebApplicationContext} for this proxy, or {@code null} if not found
 * @see #DelegatingFilterProxy(String, WebApplicationContext)
 * @see #getContextAttribute()
 * @see WebApplicationContextUtils#getWebApplicationContext(javax.servlet.ServletContext)
 * @see WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
 */
@Nullable
protected WebApplicationContext findWebApplicationContext() {
	if (this.webApplicationContext != null) {
		// The user has injected a context at construction time -> use it...
		if (this.webApplicationContext instanceof ConfigurableApplicationContext) {
			ConfigurableApplicationContext cac = (ConfigurableApplicationContext) this.webApplicationContext;
			if (!cac.isActive()) {
				// The context has not yet been refreshed -> do so before returning it...
				cac.refresh();
			}
		}
		return this.webApplicationContext;
	}
	String attrName = getContextAttribute();
	if (attrName != null) {
		return WebApplicationContextUtils.getWebApplicationContext(getServletContext(), attrName);
	}
	else {
		return WebApplicationContextUtils.findWebApplicationContext(getServletContext());
	}
}
 

@Override
public void failed(ConfigurableApplicationContext context, Throwable exception) {
    FailedApplicationEvent event = new FailedApplicationEvent(this.application, context, exception);
    if (context != null && context.isActive()) {
        context.publishEvent(event);
    } else {
        if (context instanceof AbstractApplicationContext) {
            for (ApplicationListener<?> listener : ((AbstractApplicationContext) context)
                    .getApplicationListeners()) {
                this.initialMulticaster.addApplicationListener(listener);
            }
        }

        this.initialMulticaster.setErrorHandler(new LoggingErrorHandler());
        this.initialMulticaster.multicastEvent(event);
    }
}
 

/**
 * Return the {@code WebApplicationContext} passed in at construction time, if available.
 * Otherwise, attempt to retrieve a {@code WebApplicationContext} from the
 * {@code ServletContext} attribute with the {@linkplain #setContextAttribute
 * configured name} if set. Otherwise look up a {@code WebApplicationContext} under
 * the well-known "root" application context attribute. The
 * {@code WebApplicationContext} must have already been loaded and stored in the
 * {@code ServletContext} before this filter gets initialized (or invoked).
 * <p>Subclasses may override this method to provide a different
 * {@code WebApplicationContext} retrieval strategy.
 * @return the {@code WebApplicationContext} for this proxy, or {@code null} if not found
 * @see #DelegatingFilterProxy(String, WebApplicationContext)
 * @see #getContextAttribute()
 * @see WebApplicationContextUtils#getWebApplicationContext(javax.servlet.ServletContext)
 * @see WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
 */
protected WebApplicationContext findWebApplicationContext() {
	if (this.webApplicationContext != null) {
		// The user has injected a context at construction time -> use it...
		if (this.webApplicationContext instanceof ConfigurableApplicationContext) {
			ConfigurableApplicationContext cac = (ConfigurableApplicationContext) this.webApplicationContext;
			if (!cac.isActive()) {
				// The context has not yet been refreshed -> do so before returning it...
				cac.refresh();
			}
		}
		return this.webApplicationContext;
	}
	String attrName = getContextAttribute();
	if (attrName != null) {
		return WebApplicationContextUtils.getWebApplicationContext(getServletContext(), attrName);
	}
	else {
		return WebApplicationContextUtils.findWebApplicationContext(getServletContext());
	}
}
 

/**
 * Return the {@code WebApplicationContext} passed in at construction time, if available.
 * Otherwise, attempt to retrieve a {@code WebApplicationContext} from the
 * {@code ServletContext} attribute with the {@linkplain #setContextAttribute
 * configured name} if set. Otherwise look up a {@code WebApplicationContext} under
 * the well-known "root" application context attribute. The
 * {@code WebApplicationContext} must have already been loaded and stored in the
 * {@code ServletContext} before this filter gets initialized (or invoked).
 * <p>Subclasses may override this method to provide a different
 * {@code WebApplicationContext} retrieval strategy.
 * @return the {@code WebApplicationContext} for this proxy, or {@code null} if not found
 * @see #DelegatingFilterProxy(String, WebApplicationContext)
 * @see #getContextAttribute()
 * @see WebApplicationContextUtils#getWebApplicationContext(javax.servlet.ServletContext)
 * @see WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
 */
protected WebApplicationContext findWebApplicationContext() {
	if (this.webApplicationContext != null) {
		// The user has injected a context at construction time -> use it...
		if (this.webApplicationContext instanceof ConfigurableApplicationContext) {
			ConfigurableApplicationContext cac = (ConfigurableApplicationContext) this.webApplicationContext;
			if (!cac.isActive()) {
				// The context has not yet been refreshed -> do so before returning it...
				cac.refresh();
			}
		}
		return this.webApplicationContext;
	}
	String attrName = getContextAttribute();
	if (attrName != null) {
		return WebApplicationContextUtils.getWebApplicationContext(getServletContext(), attrName);
	}
	else {
		return WebApplicationContextUtils.findWebApplicationContext(getServletContext());
	}
}
 

/**
 * Refresh the given application context, if necessary.
 */
protected void refreshApplicationContext(ApplicationContext context) {
	if (context instanceof ConfigurableApplicationContext) {
		ConfigurableApplicationContext cac = (ConfigurableApplicationContext) context;
		if (!cac.isActive()) {
			cac.refresh();
		}
	}
}
 

/**
 * Refresh the given application context, if necessary.
 */
protected void refreshApplicationContext(ApplicationContext context) {
	if (context instanceof ConfigurableApplicationContext) {
		ConfigurableApplicationContext cac = (ConfigurableApplicationContext) context;
		if (!cac.isActive()) {
			cac.refresh();
		}
	}
}
 

private int getExitCodeFromMappedException(ConfigurableApplicationContext context,
		Throwable exception) {
	if (context == null || !context.isActive()) {
		return 0;
	}
	ExitCodeGenerators generators = new ExitCodeGenerators();
	Collection<ExitCodeExceptionMapper> beans = context
			.getBeansOfType(ExitCodeExceptionMapper.class).values();
	generators.addAll(exception, beans);
	return generators.getExitCode();
}
 

public boolean isActive(){
	if(appContext instanceof ConfigurableApplicationContext){
		ConfigurableApplicationContext cac = (ConfigurableApplicationContext) appContext;
		return cac.isActive();
	}
	return isInitialized();
}