Enterprise Integration Patterns with Java EE

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© 2013 innoQ Deutschland GmbH Patterns for EAI Design Patterns (Gamma et al), 1994 Proven solutions for common problems Enterprise Integration Patterns (Hohpe & Woolf), 2003 Swiss-army knife for asynchronous messaging

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© 2013 innoQ Deutschland GmbH Enhance the system with an importer! Simple Change • Receive CSV-data via HTTP POST • CSV contains header and detail records • Import data into database order management system

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© 2013 innoQ Deutschland GmbH A Simple Java EE sample @WebServlet(urlPatterns = {"/order/import"}) public class ImporterServlet extends HttpServlet { @Inject OrderBean bean; @Inject CsvDataParser parser; @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String data = request.getParameter("csvdata"); List orders = parser.transform(data); for (Order order : orders) { bean.persist(order); } } }

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© 2013 innoQ Deutschland GmbH Something wrong here? @WebServlet(urlPatterns = {"/order/import"}) public class ImporterServlet extends HttpServlet { @Inject OrderBean bean; @Inject CsvDataParser parser; @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String data = request.getParameter("csvdata"); List orders = parser.transform(data); for (Order order : orders) { bean.persist(order); } } }

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© 2013 innoQ Deutschland GmbH A simple camel route from("jetty:http://localhost:9080/order/import") .routeId(“orderimport”) .process(new PostParameterProcessor(“csvdata”)) .process(new StringRemover(new String[]{"\""})) .unmarshal().csv() .split(body(List.class)) .aggregate(header("orderId"), new StringAggregationStrategy()).completionTimeout(3000) .to("seda:singlepartsroute");