package com.aws.ec2.transitgatewayattachment; import com.aws.ec2.transitgatewayattachment.workflow.delete.Delete; import com.aws.ec2.transitgatewayattachment.workflow.delete.ValidateCurrentState; import software.amazon.awssdk.services.ec2.Ec2Client; import software.amazon.cloudformation.proxy.*; public class DeleteHandler extends BaseHandlerStd { protected ProgressEvent<ResourceModel, CallbackContext> handleRequest( final AmazonWebServicesClientProxy proxy, final ResourceHandlerRequest<ResourceModel> request, final CallbackContext callbackContext, final ProxyClient<Ec2Client> proxyClient, final Logger logger) { return ProgressEvent.progress(request.getDesiredResourceState(), callbackContext) .then(new ValidateCurrentState(proxy, request, callbackContext, proxyClient, logger)::run) .then(new Delete(proxy, request, callbackContext, proxyClient, logger)::run) .then(_progress -> ProgressEvent.defaultSuccessHandler(null)); //After delete successfully completes we want to return a null response because the model no longer exits } }