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Published byHarvey Bates Modified over 8 years ago
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Bare-knuckle web development Odessa Johannes Brodwall, Chief scientist Exilesoft Global
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Bare-knuckle philosophy Demonstration of bare- knuckle web in Java Further directions
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Part I:
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The bare-knuckle philosophy
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High impact/low ceremony Framework light Test-driven
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High impact with low ceremony
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Java web: Servlets, WebDriver, Jetty, Mockito
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Java SOAP: JOOX, HttpURLConnection
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.NET web prototype: WebDriver + HttpListener
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.NET web work-in- progress: WebDriver + HttpSelfHostServer
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Light on framework
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Frameworks solve 80% of the job…
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… and makes the rest 10 times as hard
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“Why did Hibernate suddenly slow down?”
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“How do I implement a custom SOAP header with JAX-WS?”
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“How to do X with Spring”
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@AutoWire + package scan with 100s of beans
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Test-driven
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No more architecture than what’s needed
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Fast feedback cycle – also in the future
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Part II:
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Demo: Phonebook web app
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Test driving
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WebDriver browser = createWebDriver(); browser.get(url); browser.findElement(By.linkText("Add contact")).click(); browser.findEleme(By.name("fullName")).sendKeys("Vader"); browser.findEleme(By.name("phoneNumber")).sendKeys("27"); browser.findEleme(By.name("saveContact")).click(); browser.findElement(By.linkText("Find contact")).click(); browser.findElem(By.name("nameQuery")).sendKeys("vader"); browser.findElement(By.name("nameQuery")).submit(); assertThat(browser.findElem(By.id("contacts")).getText()).contains("555-33274-7827");
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Server server = new Server(0); server.setHandler( new WebAppContext("src/main/webapp", "/contacts")); server.start(); int port = server.getConnectors()[0].getLocalPort(); String url = "http://localhost:" + port + "/contacts";
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contactServlet com.exilesoft.bareknuckleweb.ContactServlet contactServlet contact/*
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public class ContactServlet extends HttpServlet { }
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@Test public void shouldShowAddForm() throws Exception { ContactServlet servlet = new ContactServlet(); HttpServletRequest req = mock(HttpServletRequest.class); HttpServletResponse resp = mock(HttpServletResponse.class); StringWriter html = new StringWriter(); when(resp.getWriter()).thenReturn(new PrintWriter(html)); when(req.getPathInfo()).thenReturn("/create.html"); servlet.doGet(req, resp); verify(resp).setContentType("text/html"); assertThat(html.toString()).contains("<form method='post'").contains("<input type='text' name='fullName'").contains("<input type='text' name='phoneNumber'").contains("<input type='submit' name='createContact'"); }
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Refactoring
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Part III:
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Further directorions
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Norwegian agricultural authority
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Java web application with an MVC architecture
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Controllers: Create a view Retrieve model from repo Set model on view Render view
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View example:
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@Override public void render(HttpServletResponse resp) throws IOException { Match document = $("html", head(), $("img").attr("src", "/sms-varsel/Sparebank1.jpg"), $("h1", "Internet bank simulator"), $("form").attr("method", "post").append( hiddenField(this.bankNum, "bankNum"), hiddenField(this.customerId, "customerId"), $("h2", "Set Mobile Phone Number"), phoneNumberField(this.phoneNumber), $("h2", "Account numbers"), accountNumbersField(this.accountNumbers), $("h2", "Payment account"), paymentAccountField(this.defaultAccount), $("h2", "Save changes"), $("div", $("input").attr("type", "submit").attr("value", "Store")).attr("name", "update"))); resp.setContentType("text/html"); resp.setCharacterEncoding("UTF-8"); resp.getWriter().write(document.toString()); }
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Match document = $("html", head(), $("img").attr("src", "/logo.jpg"), $("h1", “Page name"), $("form").attr("method", "post").append( hiddenField(this.bankNum, "bankNum"), hiddenField(this.customerId, "customerId"), $("h2", "Save changes"), $("div", $("input").attr("type", "submit").attr("value", "Store")).attr("name", "update")));
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Norwegian Power Transmission System Operator
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Universal repository Universal service Commands and Queries One domain model
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No Spring – 100 KLOC
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Single-jar deployment Includes scripts Includes Jetty
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public class StatnettWebServer { private final org.eclipse.jetty.server.Server server; public ContactWebServer(int port) { server = new Server(port); server.setHandler(new WebAppContext(“…", "/statnett")); } void start() throws Exception { server.start(); } String getUrl() { int port = server.getConnectors()[0].getLocalPort(); return "http://localhost:" + port + "/contacts"; } public static void main(String[] args) throws Exception { StatnettWebServer server = new StatnettWebServer(10080); server.start(); System.out.println(server.getUrl()); }
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SpareBank1
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10 web service clients
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HttpURLConnection JOOX
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@Override public String getCountryByIp(String ipAddress) throws Exception { Document soapRequest = soapElement("S:Envelope", $("S:Body", wsxElement("wsx:GetGeoIP", $("wsx:IPAddress", ipAddress)))); Document soapResponse endpoint.postRequest(getSOAPAction(), soapRequest); return $(soapResponse).xpath("/Envelope/Body/*").xpath("GetGeoIPResult/CountryName").text(); }
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public Document postRequest(String soapAction, Document soapRequest) { HttpURLConnection conn = (HttpURLConnection) url.openConnection(); connection.setDoInput(true); connection.setDoOutput(true); connection.addRequestProperty("SOAPAction", soapAction); connection.addRequestProperty("Content-Type", "text/xml"); $(soapRequest).write(connection.getOutputStream()); int responseCode = connection.getResponseCode(); if (isErrorResponse(responseCode)) { String response = toString(connection.getErrorStream()); String responseContentType = connection.getContentType(); if (responseContentType.startsWith("text/xml")) { return response; } throw new ServiceCommunicationException( "On POST to " + url + ": " + responseCode + " " + connection.getResponseMessage() + ": " + response); } return $(connection.getInputStream()).document(); d}
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Conclusion:
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YAGNI
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Test-driven development High investment in tests Low investment in frameworks
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Thank you jbr@exilesoft.com http://johannesbrodwall.com http://exilesoft.com http://twitter.com/jhannes
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