com.agnie.gwt.common.client.rpc.LoaderRpcRequestBuilder.java Source code

Introduction

Here is the source code for com.agnie.gwt.common.client.rpc.LoaderRpcRequestBuilder.java

Source

/*******************************************************************************
 * Copyright (c) 2014 Agnie Technologies.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Agnie Technologies - initial API and implementation
 ******************************************************************************/
package com.agnie.gwt.common.client.rpc;

import com.agnie.common.gwt.serverclient.client.enums.QueryString;
import com.agnie.common.gwt.serverclient.client.helper.URLGenerator;
import com.agnie.common.gwt.serverclient.client.helper.URLInfo;
import com.agnie.common.gwt.serverclient.client.injector.CommonServerClientModule;
import com.agnie.gwt.common.client.widget.Loader;
import com.google.gwt.core.client.GWT;
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.Response;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.RpcRequestBuilder;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

/**
 * RpcRequest builder to show modal loader .gif image before making call and hide once we receive the response.
 * 
 */
@Singleton
public class LoaderRpcRequestBuilder extends RpcRequestBuilder {
    @Inject
    @Named(CommonServerClientModule.CURRENT_APP_DOMAIN)
    String appDomain;
    @Inject
    URLGenerator urlGenerator;
    @Inject
    URLInfo urlInfo;

    private Loader loader;

    private class RequestCallbackWrapper implements RequestCallback {

        private RequestCallback callback;

        RequestCallbackWrapper(RequestCallback aCallback) {
            this.callback = aCallback;
        }

        @Override
        public void onResponseReceived(Request request, Response response) {
            loader.hide();
            if (Response.SC_UNAUTHORIZED == response.getStatusCode()) {
                GWT.log("User session timed out or user logged out");
                Window.Location.assign(urlGenerator.getClientSideLoginURL(urlInfo, appDomain,
                        urlInfo.getParameter(QueryString.GWT_DEV_MODE.getKey())));
            } else {
                callback.onResponseReceived(request, response);
            }
        }

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

    }

    public LoaderRpcRequestBuilder(Loader loader) {
        this.loader = loader;
        loader.hide();
    }

    public LoaderRpcRequestBuilder() {
        this(new Loader());
    }

    @Override
    protected RequestBuilder doCreate(String serviceEntryPoint) {
        RequestBuilder rb = super.doCreate(serviceEntryPoint);
        loader.show();
        return rb;
    }

    @Override
    protected void doFinish(RequestBuilder rb) {
        super.doFinish(rb);
        rb.setCallback(new RequestCallbackWrapper(rb.getCallback()));
    }
}