n3phele.client.presenter.ProgressActivity.java Source code

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Here is the source code for n3phele.client.presenter.ProgressActivity.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the 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 n3phele.client.presenter;

import n3phele.client.CacheManager;
import n3phele.client.ClientFactory;
import n3phele.client.N3phele;
import n3phele.client.model.Progress;
import n3phele.client.presenter.AbstractActivityProgressActivity.ProgressUpdate;
import n3phele.client.presenter.AbstractActivityProgressActivity.ProgressUpdateEventHandler;
import n3phele.client.presenter.helpers.AuthenticatedRequestFactory;
import n3phele.client.presenter.helpers.ProgressUpdateHelper;
import n3phele.client.view.ProgressView;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.HandlerRegistration;
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.History;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.gwt.user.client.ui.IsWidget;

public class ProgressActivity extends AbstractActivity {
    private final String progressUri;
    private final ProgressView display;
    private Progress progress = null;
    private final CacheManager cacheManager;
    private final EventBus eventBus;
    private HandlerRegistration itemUpdateHandlerRegistration;
    private Timer refreshTimer = null;

    public ProgressActivity(String progressUri, ClientFactory factory) {
        this.progressUri = progressUri;
        this.display = factory.getProgressView();
        this.cacheManager = factory.getCacheManager();
        this.eventBus = factory.getEventBus();
    }

    @Override
    public void start(AcceptsOneWidget panel, EventBus eventBus) {
        display.setPresenter(this);
        panel.setWidget(display);
        display.setData(this.progress);
        handlerRegistration(eventBus);
        initProgressUpdate();
        getProgress();

    }

    @Override
    public String mayStop() {
        return null;
    }

    @Override
    public void onCancel() {
        killRefreshTimer();
        unregister();
    }

    @Override
    public void onStop() {
        killRefreshTimer();
        unregister();
        this.display.setData(null);
    }

    protected void clearLHS() {
        IsWidget w = N3phele.basePanel.getLeftHandside();
    }

    protected void updateProgress(Progress progress) {
        this.progress = progress;
        display.setData(this.progress);
    }

    public void goToPrevious() {
        History.back();
    }

    /*
     * Data Handling
     * -------------
     */

    public void getProgress() {
        // Send request to server and catch any errors.
        RequestBuilder builder = AuthenticatedRequestFactory.newRequest(RequestBuilder.GET, progressUri);
        try {
            Request request = builder.sendRequest(null, new RequestCallback() {
                public void onError(Request request, Throwable exception) {
                    // displayError("Couldn't retrieve JSON "+exception.getMessage());
                }

                public void onResponseReceived(Request request, Response response) {
                    GWT.log("Got reply");
                    if (200 == response.getStatusCode()) {
                        Progress progress = Progress.asProgress(response.getText());
                        updateProgress(progress);
                    } else {

                    }
                }

            });
        } catch (RequestException e) {
            //displayError("Couldn't retrieve JSON "+e.getMessage());
        }
    }

    private void initProgressUpdate() {
        // setup timer to refresh list automatically
        refreshTimer = new Timer() {
            public void run() {
                if (progress != null) {
                    String status = progress.getStatus();
                    if (!"COMPLETE".equals(status) && !"FAILED".equals(status) && !"CANCELLED".equals(status)) {
                        int update = updateProgressCounter(progress);
                        if (update != progress.getPercentx10Complete()) {
                            //progress.setPercentagex10Complete(update);
                            display.refresh(progress);
                        }
                    }

                }
            }
        };
        refreshTimer.scheduleRepeating(30000);
    }

    private void killRefreshTimer() {
        if (refreshTimer != null) {
            refreshTimer.cancel();
            refreshTimer = null;

        }
    }

    private int updateProgressCounter(Progress progress) {
        return ProgressUpdateHelper.updateProgress(progress);
    }

    /*
     * Event Definition
     * ----------------
     */

    public void handlerRegistration(EventBus eventBus) {
        this.itemUpdateHandlerRegistration = this.eventBus.addHandler(ProgressUpdate.TYPE,
                new ProgressUpdateEventHandler() {
                    @Override
                    public void onMessageReceived(ProgressUpdate event) {
                        if (event.getKey().equals(progressUri))
                            getProgress();
                    }
                });
    }

    protected void unregister() {
        this.itemUpdateHandlerRegistration.removeHandler();
    }

}