Android Open Source - Wardrobe_app Sync Helper

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Back to project page Wardrobe_app.
License

The source code is released under:
Apache License
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Java Source Code

package com.android.busolo.apps.wardrobe.sync;
/* w w  w.j  a va  2 s.  c  o  m*/
import android.content.ContentProviderOperation;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.OperationApplicationException;
import android.content.SharedPreferences;
import android.content.SyncResult;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.os.RemoteException;
import android.preference.PreferenceManager;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;

import static com.android.busolo.apps.wardrobe.utils.LogUtils.makeLogTag;
import static com.android.busolo.apps.wardrobe.utils.LogUtils.LOGI;
import static com.android.busolo.apps.wardrobe.utils.LogUtils.LOGD;

/**
 * Created by s-brian on 5/24/2014.
 */
public class SyncHelper {private static final String TAG = makeLogTag(SyncHelper.class);

    public static final int FLAG_SYNC_LOCAL = 0x1;
    public static final int FLAG_SYNC_REMOTE = 0x2;

    private static final int LOCAL_VERSION_CURRENT = 2013171;

    private Context mContext;

    public SyncHelper(Context context) {
        mContext = context;
    }

    /**
     * Start a sync manually using the supplied context.
     *
     * @param context The context to start the sync service under.
     */
    public static void requestManualSync(Context context) {
        Context appContext = context.getApplicationContext();
        Intent serviceIntent = new Intent(appContext, SyncService.class);
        serviceIntent.putExtra(ContentResolver.SYNC_EXTRAS_MANUAL, true);
        appContext.startService(serviceIntent);
    }

    /**
     * Loads conference information (sessions, rooms, tracks, speakers, etc.)
     * from a local static cache data and then syncs down data from the
     * Conference API.
     *
     * @param syncResult Optional {@link SyncResult} object to populate.
     * @throws java.io.IOException
     */
    public void performSync(SyncResult syncResult, int flags) throws IOException {

        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
        final int localVersion = prefs.getInt("local_data_version", 0);

        // Bulk of sync work, performed by executing several fetches from
        // local and online sources.
        final ContentResolver resolver = mContext.getContentResolver();
        ArrayList<ContentProviderOperation> batch = new ArrayList<ContentProviderOperation>();

        LOGI(TAG, "Performing sync");

        if ((flags & FLAG_SYNC_LOCAL) != 0) {
            final long startLocal = System.currentTimeMillis();
            final boolean localParse = localVersion < LOCAL_VERSION_CURRENT;
            LOGD(TAG, "found localVersion=" + localVersion + " and LOCAL_VERSION_CURRENT="
                    + LOCAL_VERSION_CURRENT);
            // Only run local sync if there's a newer version of data available
            // than what was last locally-sync'd.
            if (localParse) {

                prefs.edit().putInt("local_data_version", LOCAL_VERSION_CURRENT).commit();
                if (syncResult != null) {
                    ++syncResult.stats.numUpdates; // TODO: better way of indicating progress?
                    ++syncResult.stats.numEntries;
                }
            }

            LOGD(TAG, "Local sync took " + (System.currentTimeMillis() - startLocal) + "ms");
        }
    }

    private boolean isOnline() {
        ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(
                Context.CONNECTIVITY_SERVICE);
        return cm.getActiveNetworkInfo() != null &&
                cm.getActiveNetworkInfo().isConnectedOrConnecting();
    }

    /**
     * Write the byte array directly to a file.
     * @throws IOException
     */
    private void writeFile(byte[] data, File file) throws IOException {
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file, false));
        bos.write(data);
        bos.close();
    }
}
Java Source Code List
