com.amazonaws.serverless.proxy.spring

Class LambdaSpringApplicationInitializer

java.lang.Object

com.amazonaws.serverless.proxy.spring.LambdaSpringApplicationInitializer

All Implemented Interfaces:

org.springframework.web.WebApplicationInitializer

public class LambdaSpringApplicationInitializer
extends java.lang.Object
implements org.springframework.web.WebApplicationInitializer

Custom implementation of Spring's `WebApplicationInitializer`. Uses internal variables to keep application state and creates a DispatcherServlet to handle incoming events. When the first event arrives it extracts the ServletContext and starts the Spring application. This class assumes that the implementation of `HttpServletRequest` that is passed in correctly implements the `getServletContext` method. State is kept using the `initialized` boolean variable. Each time a new event is received, the app sets the `currentResponse` private property to the value of the new `HttpServletResponse` object. This is used to intercept Spring notifications for the `ServletRequestHandledEvent` and call the flush method to release the latch.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	ERROR_NO_CONTEXT

Constructor Summary

Constructors

Constructor and Description
LambdaSpringApplicationInitializer(org.springframework.web.context.ConfigurableWebApplicationContext applicationContext) Creates a new instance of the WebApplicationInitializer

Method Summary

Modifier and Type	Method and Description
void	addListener(javax.servlet.ServletContextListener listener) Adds a new listener for the servlet context events.
void	dispatch(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
java.util.List<java.lang.String>	getSpringProfiles()
void	onStartup(javax.servlet.ServletContext servletContext)
void	setRefreshContext(boolean refreshContext)
void	setSpringProfiles(java.util.List<java.lang.String> springProfiles)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ERROR_NO_CONTEXT

public static final java.lang.String ERROR_NO_CONTEXT

See Also:

Constant Field Values

Constructor Detail

LambdaSpringApplicationInitializer

public LambdaSpringApplicationInitializer(org.springframework.web.context.ConfigurableWebApplicationContext applicationContext)

Creates a new instance of the WebApplicationInitializer

Parameters:

applicationContext - A custom ConfigurableWebApplicationContext to be used

Method Detail

addListener

public void addListener(javax.servlet.ServletContextListener listener)

Adds a new listener for the servlet context events. At the moment the library only emits events when the application is initialized. Because we don't have container lifecycle notifications from Lambda the `contextDestroyed` method is never called

Parameters:

listener - An implementation of `ServletContextListener`

setRefreshContext

public void setRefreshContext(boolean refreshContext)

dispatch

public void dispatch(javax.servlet.http.HttpServletRequest request,
                     javax.servlet.http.HttpServletResponse response)
              throws javax.servlet.ServletException,
                     java.io.IOException

Throws:

javax.servlet.ServletException

java.io.IOException

getSpringProfiles

public java.util.List<java.lang.String> getSpringProfiles()

setSpringProfiles

public void setSpringProfiles(java.util.List<java.lang.String> springProfiles)

onStartup

public void onStartup(javax.servlet.ServletContext servletContext)
               throws javax.servlet.ServletException

Specified by:

onStartup in interface org.springframework.web.WebApplicationInitializer

Throws:

javax.servlet.ServletException