com.conferenceengineer.android.iosched.gcm.command.SyncCommand.java Source code

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Here is the source code for com.conferenceengineer.android.iosched.gcm.command.SyncCommand.java

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/*
 * Copyright 2013 Google Inc.
 *
 * 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.conferenceengineer.android.iosched.gcm.command;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import com.conferenceengineer.android.iosched.gcm.GCMCommand;
import com.conferenceengineer.android.iosched.sync.TriggerSyncReceiver;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.Random;

import static com.conferenceengineer.android.iosched.util.LogUtils.LOGI;
import static com.conferenceengineer.android.iosched.util.LogUtils.makeLogTag;

public class SyncCommand extends GCMCommand {
    private static final String TAG = makeLogTag("SyncCommand");
    private static final int DEFAULT_TRIGGER_SYNC_MAX_JITTER_MILLIS = 15 * 60 * 1000; // 15 minutes
    private static final Random RANDOM = new Random();

    @Override
    public void execute(Context context, String type, String extraData) {
        LOGI(TAG, "Received GCM message: " + type);
        int syncJitter;
        SyncData syncData = null;
        if (extraData != null) {
            try {
                JSONObject root = new JSONObject(extraData);
                int jitter = root.getInt("sync_jitter");
                syncData = new SyncData(jitter);
            } catch (JSONException e) {
                LOGI(TAG, "Error while decoding extraData: " + e.toString());
            }
        }

        if (syncData != null && syncData.sync_jitter != 0) {
            syncJitter = syncData.sync_jitter;
        } else {
            syncJitter = DEFAULT_TRIGGER_SYNC_MAX_JITTER_MILLIS;
        }

        scheduleSync(context, syncJitter);
    }

    private void scheduleSync(Context context, int syncJitter) {
        int jitterMillis = (int) (RANDOM.nextFloat() * syncJitter);
        final String debugMessage = "Scheduling next sync for " + jitterMillis + "ms";
        LOGI(TAG, debugMessage);

        ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).set(AlarmManager.RTC,
                System.currentTimeMillis() + jitterMillis, PendingIntent.getBroadcast(context, 0,
                        new Intent(context, TriggerSyncReceiver.class), PendingIntent.FLAG_CANCEL_CURRENT));

    }

    protected int getDefaultTriggerSyncMaxJitterMillis() {
        return DEFAULT_TRIGGER_SYNC_MAX_JITTER_MILLIS;
    }

    class SyncData {
        private int sync_jitter;

        SyncData(int sync_jitter) {
            this.sync_jitter = sync_jitter;
        }
    }
}