/highlevelserverexample/src/main/java/csc375/highlevelserverexample/HighLevelServerExample.java

https://bitbucket.org/jdblake/csc375-18sp · Java · 68 lines · 50 code · 10 blank · 8 comment · 0 complexity · 214ac7377efceb7aab5b04c46048584c MD5 · raw file 

    

  1. package csc375.highlevelserverexample;
    2. 

  2. 

  3. import akka.NotUsed;
    4. 

  4. import akka.actor.ActorSystem;
    5. 

  5. import akka.http.javadsl.ConnectHttp;
    6. 

  6. import akka.http.javadsl.Http;
    7. 

  7. import akka.http.javadsl.ServerBinding;
    8. 

  8. import akka.http.javadsl.model.ContentTypes;
    9. 

  9. import akka.http.javadsl.model.HttpEntities;
    10. 

  10. import akka.http.javadsl.model.HttpRequest;
    11. 

  11. import akka.http.javadsl.model.HttpResponse;
    12. 

  12. import akka.http.javadsl.server.AllDirectives;
    13. 

  13. import akka.http.javadsl.server.Route;
    14. 

  14. import akka.stream.ActorMaterializer;
    15. 

  15. import akka.stream.javadsl.Flow;
    16. 

  16. import java.io.IOException;
    17. 

  17. import java.util.concurrent.CompletionStage;
    18. 

  18. 

  19. public class HighLevelServerExample extends AllDirectives {
    20. 

  20.   public static void main(String[] args) throws IOException {
    21. 

  21.     // boot up server using the route as defined below
    22. 

  22.     ActorSystem system = ActorSystem.create();
    23. 

  23. 

  24.     final HighLevelServerExample app = new HighLevelServerExample();
    25. 

  25. 

  26.     final Http http = Http.get(system);
    27. 

  27.     final ActorMaterializer materializer = ActorMaterializer.create(system);
    28. 

  28. 

  29.     final Flow<HttpRequest, HttpResponse, NotUsed> routeFlow = app.createRoute().flow(system, materializer);
    30. 

  30.     final CompletionStage<ServerBinding> binding = http.bindAndHandle(routeFlow, ConnectHttp.toHost("localhost", 8080), materializer);
    31. 

  31. 

  32.     System.out.println("Type RETURN to exit");
    33. 

  33.     System.in.read();
    34. 

  34. 

  35.     binding
    36. 

  36.       .thenCompose(ServerBinding::unbind)
    37. 

  37.       .thenAccept(unbound -> system.terminate());
    38. 

  38.   }
    39. 

  39. 

  40.   public Route createRoute() {
    41. 

  41.     // This handler generates responses to `/hello?name=XXX` requests
    42. 

  42.     Route helloRoute =
    43. 

  43.       parameterOptional("name", optName -> {
    44. 

  44.         String name = optName.orElse("Mister X");
    45. 

  45.         return complete("Hello " + name + "!");
    46. 

  46.       });
    47. 

  47. 

  48.     return
    49. 

  49.       // here the complete behavior for this server is defined
    50. 

  50. 

  51.       // only handle GET requests (short circuits!)
    52. 

  52.       get(() -> route(
    53. 

  53.         // matches the empty path
    54. 

  54.         pathSingleSlash(() ->
    55. 

  55.           // return a constant string with a certain content type
    56. 

  56.           complete(HttpEntities.create(ContentTypes.TEXT_HTML_UTF8, "<html><body>Hello world!</body></html>"))
    57. 

  57.         ),
    58. 

  58.         path("ping", () ->
    59. 

  59.           // return a simple `text/plain` response
    60. 

  60.           complete("PONG!")
    61. 

  61.         ),
    62. 

  62.         path("hello", () ->
    63. 

  63.           // uses the route defined above
    64. 

  64.           helloRoute
    65. 

  65.         )
    66. 

  66.       ));
    67. 

  67.   }
    68. 

  68. }
    69.