package example; import javax.inject.Inject; import javax.enterprise.inject.Any; import javax.enterprise.inject.Instance; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class GetServlet extends HttpServlet { // service pattern private @Inject MyService _service; // plugin/extension pattern private @Inject @Any Instance _resources; // startup pattern private @Inject StartupResourceBean _startupResource; @Override public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html; charset=utf-8"); PrintWriter out = response.getWriter(); writeHeader(out); // service pattern out.println("

CanDI Service Pattern

"); out.println(""); out.println("
BindingValue"); out.println("
@Inject MyService" + _service); out.println("
"); // plugin/extension pattern out.println("

CanDI Plugin/Extension Pattern

"); out.println("
    "); for (MyResource resource : _resources) { out.println("
  1. " + resource); } out.println("
"); // startup pattern out.println("

CanDI Startup Pattern

"); out.println(""); out.println("
BindingValue"); out.println("
@Inject StartupResourceBean" + _startupResource); out.println("
"); writeFooter(out); } private void writeHeader(PrintWriter out) throws IOException { out.println("CanDI Pattern Tutorial: GetServlet"); out.println(""); out.println("
"); out.println(" docs"); out.println(" / examples"); out.println(" / CanDI pattern tutorial"); out.println("
"); out.println("

CanDI Pattern Tutorial: GetServlet

"); out.println("

GetServlet retrieves the service pattern, demonstrating"); out.println("that the service is shared between all injecting classes"); out.println("

Demo Links

"); out.println(""); } private void writeFooter(PrintWriter out) throws IOException { out.println("

Demo Architecture

"); out.println(""); out.println("

Code

"); out.println("
");
    out.println("public class GetServlet extends HttpServlet {");
    out.println("  // service pattern");
    out.println("  private @Inject MyService _service;");
    out.println();
    out.println("  // plugin/extension pattern");
    out.println("  private @Any Instance<MyResource> _resources;");
    out.println();
    out.println("  // startup pattern");
    out.println("  private @Inject StartupResourceBean _startupResource;");
    out.println();
    out.println("  ...");
    out.println("}");
    out.println("
"); } }