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package me.ccampo.spring.aws.lambda;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import org.springframework.context.ApplicationContext;
/**
* Central class to extend to provide Spring support for your AWS Lambda
* applications. The key to using this class is to implement the
* {@link SpringRequestHandler#getApplicationContext()} method and supply a
* valid {@link ApplicationContext} instance. Your child class that extends
* this class will be the entry point (handler) to your AWS Lambda function.
*
* The {@link SpringRequestHandler#handleRequest(Object, Context)} method is
* left virtual so it can be overridden, but the default implementation should
* work for most use cases. It simply grabs a bean of type
* {@link RequestHandler} and calls that class's
* {@link RequestHandler#handleRequest(Object, Context)} method. In this sense,
* this class is just a wrapper around your implementation of
* {@link RequestHandler}, but allows your implementation to take advantage of
* Spring's core features (dependency injection, etc).
*
* @param The input type parameter. NOTE: this type must match the input
* type parameter of your {@link RequestHandler} bean.
* @param The output type parameter. NOTE: this type must match the input
* type parameter of your {@link RequestHandler} bean.
*/
public abstract class SpringRequestHandler implements RequestHandler, ApplicationContextProvider {
private final RequestHandler handler;
public SpringRequestHandler() {
handler = getApplicationContext().getBean(RequestHandler.class);
}
@Override
@SuppressWarnings("unchecked")
public O handleRequest(final I input, final Context context) {
return (O) handler.handleRequest(input, context);
}
}