com.google.android.apps.paco.ServerCommunication.java Source code

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Here is the source code for com.google.android.apps.paco.ServerCommunication.java

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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance  with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* 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 com.google.android.apps.paco;

import java.io.IOException;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Date;
import java.util.List;

import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.joda.time.DateTime;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;

public class ServerCommunication {

    private static final int DURATION_IN_MINUTES_THAT_IS_LONGER_THAN_TIME_TO_DOWNLOAD_JOINED_EXPERIMENTS = 5;
    private static ServerCommunication instance;

    public static synchronized ServerCommunication getInstance(Context context) {
        if (instance == null) {
            UserPreferences userPrefs = new UserPreferences(context);
            AlarmManager alarmManager = (AlarmManager) (context.getSystemService(Context.ALARM_SERVICE));
            instance = new ServerCommunication(context, userPrefs, alarmManager);
        }
        return instance;
    }

    private static final Uri CONTENT_URI = Uri.parse("content://com.google.android.apps.paco.ServerCommunication/");
    private Context context;
    private UserPreferences userPrefs;
    private AlarmManager alarmManager;

    // Visible for testing
    public ServerCommunication(Context context, UserPreferences userPrefs, AlarmManager alarmManager) {
        this.context = context;
        this.userPrefs = userPrefs;
        this.alarmManager = alarmManager;
    }

    public synchronized void checkIn() {
        checkIn(false);
    }

    // Visible for testing
    public synchronized void checkIn(Boolean forTesting) {
        if (userPrefs.isJoinedExperimentsListStale() && !forTesting) {
            updateJoinedExperiments();

        }
        setNextWakeupTime();
    }

    private void setNextWakeupTime() {
        DateTime nextServerCommunicationTime = new DateTime(userPrefs.getNextServerCommunicationServiceAlarmTime());
        if (isInFuture(nextServerCommunicationTime)) {
            return;
        }

        DateTime nextCommTime = nextServerCommunicationTime.plusHours(24);
        if (nextCommTime.isBeforeNow() || nextCommTime.isEqualNow()) {
            nextCommTime = new DateTime().plusHours(24);
        }
        Intent ultimateIntent = new Intent(context, ServerCommunicationService.class);
        ultimateIntent.setData(CONTENT_URI);
        PendingIntent intent = PendingIntent.getService(context.getApplicationContext(), 0, ultimateIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager.cancel(intent);
        alarmManager.set(AlarmManager.RTC_WAKEUP, nextCommTime.getMillis(), intent);
        userPrefs.setNextServerCommunicationServiceAlarmTime(nextCommTime.getMillis());
        Log.i(PacoConstants.TAG, "Created alarm for ServerCommunicationService. Time: " + nextCommTime.toString());
    }

    private boolean isInFuture(DateTime time) {
        return time.isAfter(new DateTime()
                .plusMinutes(DURATION_IN_MINUTES_THAT_IS_LONGER_THAN_TIME_TO_DOWNLOAD_JOINED_EXPERIMENTS));
    }

    private void updateJoinedExperiments() {
        ExperimentProviderUtil experimentProviderUtil = new ExperimentProviderUtil(context);
        DownloadHelper downloadHelper = new DownloadHelper(context, userPrefs, (Integer) null, (String) null);
        List<Long> joinedExperimentServerIds = experimentProviderUtil.getJoinedExperimentServerIds();
        if (joinedExperimentServerIds != null && joinedExperimentServerIds.size() > 0) {
            String resultCode = downloadHelper.downloadRunningExperiments(joinedExperimentServerIds);
            String contentAsString = downloadHelper.getContentAsString();
            if (resultCode.equals(DownloadHelper.SUCCESS) && contentAsString != null) {
                saveDownloadedExperiments(experimentProviderUtil, contentAsString);
            }
        }
        userPrefs.setJoinedExperimentListRefreshTime(new Date().getTime());
    }

    private void saveDownloadedExperiments(ExperimentProviderUtil experimentProviderUtil, String contentAsString) {
        try {
            experimentProviderUtil.updateExistingExperiments(contentAsString);
        } catch (JsonParseException e) {
            // Nothing to be done here.
        } catch (JsonMappingException e) {
            // Nothing to be done here.
        } catch (UnsupportedCharsetException e) {
            // Nothing to be done here.
        } catch (IOException e) {
            // Nothing to be done here.
        }
    }
}