Delegate class responsible for creating {@link WebApplicationContext} onbehalf of Servlet instance. Used by {@link org.impalaframework.web.spring.servlet.ExternalModuleServlet} and{@link org.impalaframework.web.spring.integration.ExternalFrameworkIntegrationServlet}, which are both servlets set up in WEB-INF/web.xml. This class encapsulates mechanism for retrieving module from Impala's context and making it available as the Spring context to represent a particular Servlet instance. Supports reloading of the backing ApplicationContext through ModuleStateChangeListener
@author Phil Zoio
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