org.springframework.web.context.WebApplicationContext Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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.web.context;
import javax.servlet.ServletContext;
import org.springframework.context.ApplicationContext;
import org.springframework.lang.Nullable;
/**
* Interface to provide configuration for a web application. This is read-only while
* the application is running, but may be reloaded if the implementation supports this.
*
* This interface adds a {@code getServletContext()} method to the generic
* ApplicationContext interface, and defines a well-known application attribute name
* that the root context must be bound to in the bootstrap process.
*
*
Like generic application contexts, web application contexts are hierarchical.
* There is a single root context per application, while each servlet in the application
* (including a dispatcher servlet in the MVC framework) has its own child context.
*
*
In addition to standard application context lifecycle capabilities,
* WebApplicationContext implementations need to detect {@link ServletContextAware}
* beans and invoke the {@code setServletContext} method accordingly.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since January 19, 2001
* @see ServletContextAware#setServletContext
*/
public interface WebApplicationContext extends ApplicationContext {
/**
* Context attribute to bind root WebApplicationContext to on successful startup.
*
Note: If the startup of the root context fails, this attribute can contain
* an exception or error as value. Use WebApplicationContextUtils for convenient
* lookup of the root WebApplicationContext.
* @see org.springframework.web.context.support.WebApplicationContextUtils#getWebApplicationContext
* @see org.springframework.web.context.support.WebApplicationContextUtils#getRequiredWebApplicationContext
*/
String ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE = WebApplicationContext.class.getName() + ".ROOT";
/**
* Scope identifier for request scope: "request".
* Supported in addition to the standard scopes "singleton" and "prototype".
*/
String SCOPE_REQUEST = "request";
/**
* Scope identifier for session scope: "session".
* Supported in addition to the standard scopes "singleton" and "prototype".
*/
String SCOPE_SESSION = "session";
/**
* Scope identifier for the global web application scope: "application".
* Supported in addition to the standard scopes "singleton" and "prototype".
*/
String SCOPE_APPLICATION = "application";
/**
* Name of the ServletContext environment bean in the factory.
* @see javax.servlet.ServletContext
*/
String SERVLET_CONTEXT_BEAN_NAME = "servletContext";
/**
* Name of the ServletContext init-params environment bean in the factory.
*
Note: Possibly merged with ServletConfig parameters.
* ServletConfig parameters override ServletContext parameters of the same name.
* @see javax.servlet.ServletContext#getInitParameterNames()
* @see javax.servlet.ServletContext#getInitParameter(String)
* @see javax.servlet.ServletConfig#getInitParameterNames()
* @see javax.servlet.ServletConfig#getInitParameter(String)
*/
String CONTEXT_PARAMETERS_BEAN_NAME = "contextParameters";
/**
* Name of the ServletContext attributes environment bean in the factory.
* @see javax.servlet.ServletContext#getAttributeNames()
* @see javax.servlet.ServletContext#getAttribute(String)
*/
String CONTEXT_ATTRIBUTES_BEAN_NAME = "contextAttributes";
/**
* Return the standard Servlet API ServletContext for this application.
*/
@Nullable
ServletContext getServletContext();
}