com.seanchenxi.resteasy.autobean.test.client.GreetingServiceAsyncM.java Source code

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/*******************************************************************************
 * Copyright 2012 Xi CHEN
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.seanchenxi.resteasy.autobean.test.client;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException;
import com.google.gwt.user.client.rpc.InvocationException;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.StatusCodeException;
import com.google.web.bindery.autobean.shared.AutoBeanCodex;
import com.seanchenxi.resteasy.autobean.client.REST;
import com.seanchenxi.resteasy.autobean.share.RESTResponse;
import com.seanchenxi.resteasy.autobean.test.share.BeanFactory;
import com.seanchenxi.resteasy.autobean.test.share.Greeting;

public class GreetingServiceAsyncM {

    private final BeanFactory factory;

    public GreetingServiceAsyncM(BeanFactory factory) {
        this.factory = factory;
    }

    void greetServerObject(String name, boolean ok, AsyncCallback<Greeting> callback) {
        RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,
                "/rest/greetM/serverInfoObject/" + name + "-" + ok);
        builder.setHeader("Content-Type", "application/json; charset=utf-8");
        builder.setHeader("Accept", "application/json");
        builder.setCallback(new ResponseHandler(Greeting.class, callback));
        try {
            builder.send();
        } catch (RequestException ex) {
            InvocationException iex = new InvocationException(
                    "Unable to initiate the asynchronous service invocation ( greetServerObject ) -- check the network connection",
                    ex);
            callback.onFailure(iex);
        }
    }

    class ResponseHandler implements RequestCallback {

        private Class<Greeting> clazz;
        private AsyncCallback<Greeting> callback;

        public ResponseHandler(Class<Greeting> clazz, AsyncCallback<Greeting> callback) {
            this.callback = callback;
            this.clazz = clazz;
        }

        @Override
        public void onResponseReceived(Request request, Response response) {
            Greeting result = null;
            Throwable caught = null;
            try {
                RESTResponse restResponse = REST.decodeResponse(response.getText());
                int statusCode = response.getStatusCode();
                if (statusCode != Response.SC_OK) {
                    caught = new StatusCodeException(statusCode, response.getText());
                } else if (restResponse == null) {
                    caught = new InvocationException("No response payload ");
                } else {
                    // should treat exception return and primitive types
                    result = AutoBeanCodex.decode(factory, clazz, response.getText()).as();
                }
            } catch (SerializationException e) {
                caught = new IncompatibleRemoteServiceException(
                        "The response: \n{" + response.getText() + "}\n could not be deserialized", e);
            } catch (Throwable e) {
                caught = e;
            }

            if (caught != null) {
                callback.onFailure(caught);
            } else {
                callback.onSuccess(result);
            }
        }

        @Override
        public void onError(Request request, Throwable exception) {
            callback.onFailure(exception);
        }

    }
}