Send2CgeoDownloader.java

package cgeo.geocaching.network;

import cgeo.geocaching.models.Geocache;
import cgeo.geocaching.settings.Settings;
import cgeo.geocaching.utils.AndroidRxUtils;
import cgeo.geocaching.utils.DisposableHandler;
import cgeo.geocaching.utils.Log;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

import io.reactivex.Scheduler;
import okhttp3.Response;
import org.apache.commons.lang3.StringUtils;

public class Send2CgeoDownloader {

    private Send2CgeoDownloader() {
        // Do not instantiate
    }

    /**
     * Asynchronously load caches from the send2cgeo server.
     *
     * @param handler the handler to which progress information will be sent
     * @param listId the list into which caches will be stored
     */
    public static void loadFromWeb(final DisposableHandler handler, final int listId) {
        final Scheduler.Worker worker = AndroidRxUtils.networkScheduler.createWorker();
        handler.add(worker);
        AndroidRxUtils.networkScheduler.scheduleDirect(new Runnable() {
            private final Parameters params = new Parameters("code", StringUtils.defaultString(Settings.getWebDeviceCode()));
            private long baseTime = System.currentTimeMillis();

            @Override
            public void run() {
                if (System.currentTimeMillis() - baseTime >= 3 * 60000) { // maximum: 3 minutes
                    handler.sendEmptyMessage(DownloadProgress.MSG_DONE);
                    worker.dispose();
                    return;
                }

                // Download new code
                try {
                    final Response responseFromWeb = Network.getRequest("http://send2.cgeo.org/read.html", params)
                            .flatMap(Network.withSuccess).blockingGet();

                    final String response = Network.getResponseData(responseFromWeb);
                    if (response != null && response.length() > 2) {
                        handler.sendMessage(handler.obtainMessage(DownloadProgress.MSG_LOADING, response));
                        Geocache.storeCache(null, response, Collections.singleton(listId), false, null);
                        handler.sendMessage(handler.obtainMessage(DownloadProgress.MSG_LOADED, response));
                        baseTime = System.currentTimeMillis();
                        worker.schedule(this);
                    } else if ("RG".equals(response)) {
                        //Server returned RG (registration) and this device no longer registered.
                        Settings.setWebNameCode(null, null);
                        handler.sendEmptyMessage(DownloadProgress.MSG_NO_REGISTRATION);
                        handler.dispose();
                    } else {
                        worker.schedule(this, 5, TimeUnit.SECONDS);
                        handler.sendEmptyMessage(DownloadProgress.MSG_WAITING);
                    }
                } catch (final Exception e) {
                    Log.e("loadFromWeb", e);
                    handler.sendEmptyMessage(DownloadProgress.MSG_SERVER_FAIL);
                    handler.dispose();
                }
            }
        });
    }
}