org.gwt.dynamic.host.client.features.ModuleReadyFeatureProvider.java Source code

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Here is the source code for org.gwt.dynamic.host.client.features.ModuleReadyFeatureProvider.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.host.client.features;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

import org.gwt.dynamic.common.client.features.FeatureCommonConst;
import org.gwt.dynamic.common.client.features.FeatureProvider;
import org.gwt.dynamic.common.shared.Utils;
import org.gwt.dynamic.host.shared.ModuleBean;

import com.google.gwt.dom.client.Document;
import com.google.gwt.event.dom.client.DomEvent;
import com.google.gwt.event.dom.client.HasLoadHandlers;
import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
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.Timer;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class ModuleReadyFeatureProvider extends FeatureProvider<String, Void>
        implements FeatureCommonConst, HasLoadHandlers {

    private static final Logger LOG = Logger.getLogger(ModuleReadyFeatureProvider.class.getName());

    private final List<ModuleBean> moduleReadyList = new ArrayList<ModuleBean>();
    private final List<ModuleBean> moduleUnreadyList = new ArrayList<ModuleBean>();
    private final HandlerManager handlerManager;
    private final Timer timeoutTimer = new Timer() {
        @Override
        public void run() {
            DomEvent.fireNativeEvent(Document.get().createLoadEvent(), ModuleReadyFeatureProvider.this);
        }
    };

    public ModuleReadyFeatureProvider(List<ModuleBean> modules, int timeoutSeconds) {
        super(MODULE_HOST);
        if (Utils.isEmpty(modules))
            throw new IllegalArgumentException("Module list cannot be empty");
        moduleUnreadyList.addAll(modules);
        handlerManager = new HandlerManager(this);
        if (timeoutSeconds <= 0)
            timeoutSeconds = 1;
        timeoutTimer.schedule(timeoutSeconds * 1000);
        LOG.info("ModuleReadyFeatureProvider: instantiated");
    }

    @Override
    public String getType() {
        return FEATURE_MODULE_READY;
    }

    @Override
    public void call(String moduleName, AsyncCallback<Void> callback) {
        LOG.info("ModuleReadyFeatureProvider.call: moduleName=" + moduleName);
        for (ModuleBean moduleBean : moduleUnreadyList)
            if (Utils.equals(moduleName, moduleBean.getName())) {
                moduleReadyList.add(moduleBean);
                moduleUnreadyList.remove(moduleBean);
                if (moduleUnreadyList.isEmpty()) {
                    timeoutTimer.cancel();
                    DomEvent.fireNativeEvent(Document.get().createLoadEvent(), this);
                }
                return;
            }
        throw new IllegalArgumentException("Module with name '" + moduleName + "' isn't expected");
    }

    public List<ModuleBean> getReadyModules() {
        return moduleReadyList;
    }

    public List<ModuleBean> getUnreadyModules() {
        return moduleUnreadyList;
    }

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

    @Override
    public HandlerRegistration addLoadHandler(LoadHandler handler) {
        return handlerManager.addHandler(LoadEvent.getType(), handler);
    }
}