org.gwt.dynamic.common.client.services.AbstractServiceConsumer.java Source code

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Here is the source code for org.gwt.dynamic.common.client.services.AbstractServiceConsumer.java

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/*
 * Copyright 2014 Maxim Dominichenko
 * 
 * Licensed under The MIT License (MIT) (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * https://github.com/domax/gwt-dynamic-plugins/blob/master/LICENSE
 * 
 * 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 org.gwt.dynamic.common.client.services;

import static org.gwt.dynamic.common.shared.Utils.isHollow;

import java.util.logging.Logger;

import org.fusesource.restygwt.client.Method;
import org.fusesource.restygwt.client.MethodCallback;
import org.fusesource.restygwt.client.Resource;
import org.fusesource.restygwt.client.RestService;
import org.fusesource.restygwt.client.RestServiceProxy;
import org.gwt.dynamic.common.client.features.BusyFeatureConsumer;
import org.gwt.dynamic.common.client.services.BusyEvent.BusyHandler;
import org.gwt.dynamic.common.client.services.BusyEvent.HasBusyHandlers;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class AbstractServiceConsumer<R extends RestService> implements HasBusyHandlers {

    private static final Logger LOG = Logger.getLogger(AbstractServiceConsumer.class.getName());
    private static final String REST_ROOT_PATH = "rest";

    protected abstract class Requestor<T> {

        protected abstract void callRest(R rest, MethodCallback<T> callback);

        public void call(final AsyncCallback<T> callback) {
            LOG.info("AbstractServiceConsumer.Requestor.call");
            setBusy(true);
            callRest(rest, new MethodCallback<T>() {

                @Override
                public void onSuccess(Method method, T response) {
                    LOG.info("AbstractServiceConsumer.Requestor.call#callRest#onSuccess");
                    setBusy(false);
                    if (callback != null)
                        callback.onSuccess(response);
                }

                @Override
                public void onFailure(Method method, Throwable exception) {
                    LOG.severe(
                            "AbstractServiceConsumer.Requestor.call#callRest#onFailure: " + exception.getMessage());
                    setBusy(false);
                    if (callback != null)
                        callback.onFailure(exception);
                }
            });
        }
    }

    private final R rest;
    private HandlerManager handlerManager;

    private static native String getServiceUrl0(String moduleName) /*-{
                                                                   if (!$wnd.__config || !$wnd.__config[moduleName]) return null;
                                                                   return $wnd.__config[moduleName].service_url;
                                                                   }-*/;

    public static String getServiceUrl() {
        String result = GWT.isProdMode() ? getServiceUrl0(GWT.getModuleName()) : null;
        if (isHollow(result))
            result = GWT.getHostPageBaseURL() + REST_ROOT_PATH;
        return result;
    }

    protected AbstractServiceConsumer(R rest) {
        if (rest == null)
            throw new IllegalArgumentException("Rest service cannot be a null");
        this.rest = rest;
        RestServiceProxy restProxy = (RestServiceProxy) this.rest;
        String serviceUrl = getServiceUrl();
        String resourceUrl = restProxy.getResource().getUri();
        if (resourceUrl.startsWith(GWT.getModuleBaseURL()))
            serviceUrl += resourceUrl.substring(GWT.getModuleBaseURL().length() - 1);
        LOG.info("AbstractServiceConsumer: resourceUrl=" + resourceUrl + "; serviceUrl=" + serviceUrl);
        restProxy.setResource(new Resource(serviceUrl));
    }

    private void setBusy(boolean busy) {
        LOG.info("AbstractServiceConsumer.setBusy: busy=" + busy);
        fireEvent(new BusyEvent(busy));
        BusyFeatureConsumer.get().call(busy);
    }

    @Override
    public void fireEvent(GwtEvent<?> event) {
        if (handlerManager != null)
            handlerManager.fireEvent(event);
    }

    @Override
    public HandlerRegistration addBusyHandler(BusyHandler handler) {
        if (handlerManager == null)
            handlerManager = new HandlerManager(this);
        return handlerManager.addHandler(BusyEvent.getType(), handler);
    }
}