Easy REST APIs with Jersey and RestyGWT (original) (raw)

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Easy REST APIs with Jersey and RestyGWT

• 1.
  Easy REST APIswith Jersey and RestyGWT David Chandler turbomanage.wordpress.com
• 2.
  why RestyGWT? Ease ofGWT-RPC Power of Command pattern Less boilerplate Easier testing
• 3.
• 4.
  map JSON public classYqlResponse { public YqlQuery query; public static class YqlQuery { public YqlResults results; public static class YqlResults { public List quote; } } } no annotations needed
• 5.
  create a serviceAPI @Path("http://query.yahooapis.com/v1/public") public interface QuoteService extends RestService { @GET @Path("yql") public void get( @QueryParam("q") String query, @QueryParam("env") String env, @QueryParam("format") String format, MethodCallback callback); }
• 6.
  invoke the service privatestatic final QuoteService svc = GWT.create(QuoteService.class); @Override public void load(LoaderDemo.QuoteRequest input, final Callback<ListLoadResult, Throwable> callback) { svc.get(input.getYql(), ENV, FORMAT, new MethodCallback() { @Override public void onFailure(Method method, Throwable throwable) { Info.display("QuoteProxy", "failure"); callback.onFailure(throwable); } @Override public void onSuccess(Method method, YqlResponse yqlResponse) { List quotes = yqlResponse.query.results.quote; Info.display("QuoteProxy", "success"); callback.onSuccess(new ListLoadResultBean(quotes)); } }); }
• 7.
  simple CRUD API publicinterface RestApi extends RestService { @GET @Path("get") public void get(@QueryParam("id")Long id, MethodCallback callback); @GET @Path("all") public void listAll(MethodCallback<ListResponse> callback); @POST @Path("save") public void save(T obj, MethodCallback callback); @POST @Path("saveMany") public void saveMany(List obj, MethodCallback callback); @POST @Path("delete") public void delete(Long id, MethodCallback callback); }
• 8.
  not much here! minimalboilerplate @Path("/api/note") public interface NoteItemRestService extends RestApi { } private static final NoteItemRestService service = GWT.create(NoteItemRestService.class); public void addNote(Display display, long listId, Note item) { NoteList noteList = App.getNoteListService().getNoteList(listId); // All are 0-based for consistency with GWT constants item.listId = listId; service.save(item, new AppCallback(display) { @Override public void handleSuccess(Note result) { App.getAppModel().getAllNotes().add(0, result); App.getEventBus().fireEvent(new ShowMessageEvent("Note saved.")); App.getEventBus().fireEvent(new NotesLoadedEvent(App.getAppModel().getAllNotes())); App.getEventBus().fireEvent(new NoteAddedEvent(result)); } }); }
• 9.
  public class ProjectEntryPointimplements EntryPoint { private static DispatcherFactory dispatcherFactory = new DispatcherFactory(); private static FilterawareDispatcher dispatcher = dispatcherFactory.cachingDispatcher(); @Override public void onModuleLoad() { // Configure RestyGWT dispatcher.addFilter(new CORSFilter()); Defaults.setDispatcher(dispatcher); LoaderDemo loaderDemo = new LoaderDemo(); RootPanel.get().add(loaderDemo); } } ListAllNotesAction, ListAllNotesResult, AddNoteAction, AddNoteResult, … Command pattern
• 10.
  server side @Path("api/note") public classNoteDao extends RestServiceDao { private static final Logger LOG = Logger.getLogger(NoteDao.class.getName()); @Override @Path("all") @GET public ListWrapper findAll() { User user = AuthFilter.getUser(); List notes = this.listByOwner(user); return new ListWrapper(notes); } . . . }
• 11.
  Objectify + Jersey @Produces(MediaType.APPLICATION_JSON) publicclass RestServiceDao extends ObjectifyDao { public T getForOwner() { User user = AuthFilter.getUser(); T obj = null; try { obj = this.getByOwner(user); return obj; } catch (TooManyResultsException e) { throw new WebApplicationException(e); } } public ListWrapper findAll() { User user = AuthFilter.getUser(); List userAll = this.listByOwner(user); return new ListWrapper(userAll); } . . . }
• 12.
  getting Jersey pom.xml org.glassfish.jersey.containers <!-- ifyour container implements Servlet API older than 3.0, use "jersey-container-servlet-core" --> jersey-container-servlet-core 2.7 org.glassfish.hk2 hk2-api 2.3.0-b09 com.fasterxml.jackson.jaxrs jackson-jaxrs-json-provider 2.3.2
• 13.
• 14.
  what about auth? AuthFilter.java //if an API call, return JSON response if (path.startsWith("/listmaker/api")) { ((HttpServletResponse) resp).setStatus(401); resp.setContentType(MediaType.TEXT_PLAIN); resp.getWriter().write("User must log in"); } else { // otherwise redirect httpRes.sendRedirect(LOGIN_FORM); } AuthFilter com.turbomanage.gwt.server.servlet.AuthFilter AuthFilter /listmaker/*
• 15.
  exception handling @Override public voidonFailure(Method method, Throwable throwable) { String url = method.builder.getUrl(); App.getLogger().log(Level.SEVERE, "Error calling service " + url, throwable); try { // Decode the exception if (throwable instanceof FailedStatusCodeException) { FailedStatusCodeException sce = (FailedStatusCodeException) throwable; App.getLogger().log(Level.SEVERE, "Service returned " + sce.getStatusCode() + sce.getMessage()); if (401 == sce.getStatusCode()) { Window.Location.replace(LOGIN_FORM); } else if (500 == sce.getStatusCode()) { if ("UserNotRegisteredException".equals(sce.getMessage())) { Window.Location.replace(SIGNUP_URL); } } } handleFailure(throwable); } finally { reset(null); } }
• 16.
  application error handling service.save(item,new AppCallback(display) { @Override public void handleSuccess(Note result) { . . . } }); public abstract class AppCallback implements MethodCallback { private final Display display; public AppCallback() { this.display = null; } public AppCallback(Display display) { this.display = display; display.startProcessing(); } . . . }
• 17.
  finer points Text, JSON,XML via direct API — res.get()… CachingRetryingDispatcher ModelChangeEvent Objects with final fields (@JsonCreator) Polymorphism (@JsonSubTypes)
• 18.
  same obj onclient / server? older versions of RestyGWT used Jackson 1.7 RestyGWT 2.0 uses Jackson 2.3 so you can now use the same annotations on client and server and therefore the same POJOs (yeah)! use @JsonIgnore for server-only fields (like Ref)
• 19.
  Please rate thissession at gwtcreate.com/agenda src github.com/turbomanage/listmaker David Chandler turbomanage.wordpress.com resty-gwt.github.io