public void SyncDatabaseInBackground(PlayServicesManager playServicesManager)
{
if(null == playServicesManager || !playServicesManager.IsConnected) {
return;
}
Logger.Info("Starting database sync task...");
Task.Run(async () => {
PlayServicesManifest localManifest = await ReadLocalManifest().ConfigureAwait(false);
if(null == localManifest) {
localManifest = new PlayServicesManifest();
await WriteLocalManifset(localManifest).ConfigureAwait(false);
}
PlayServicesManifest remoteManifest = await ReadRemoteManifest().ConfigureAwait(false);
if(null == remoteManifest) {
remoteManifest = new PlayServicesManifest();
await WriteRemoteManifestFile(playServicesManager).ConfigureAwait(false);
}
if(ShouldPull(localManifest)) {
await PullDatabaseFile(playServicesManager).ConfigureAwait(false);
} else if(ShouldPush(localManifest, remoteManifest)) {
await PushDatabaseFile(playServicesManager).ConfigureAwait(false);
} else {
SyncConflictAction conflictResolutionAction = await GetConflictResolutionAction().ConfigureAwait(false);
switch(conflictResolutionAction)
{
case SyncConflictAction.Push:
await PushDatabaseFile(playServicesManager).ConfigureAwait(false);
break;
case SyncConflictAction.Pull:
await PullDatabaseFile(playServicesManager).ConfigureAwait(false);
break;
}
}
Logger.Info("Database sync task complete!");
});
}
protected override async Task WriteLocalManifset(PlayServicesManifest localManifest)
{
await Task.Delay(0).ConfigureAwait(false);
}
private async Task WriteRemoteManifestFile(PlayServicesManager playServicesManager)
{
using(Stream stream = new MemoryStream()) {
PlayServicesManifest manifest = new PlayServicesManifest();
await manifest.Write(stream).ConfigureAwait(false);
await stream.FlushAsync().ConfigureAwait(false);
stream.Position = 0;
await playServicesManager.SaveFileToDriveAppFolderAsync(PlayServicesManifest.FileTitle, PlayServicesManifest.ContentType, stream).ConfigureAwait(false);
}
}
protected abstract Task WriteLocalManifset(PlayServicesManifest localManifest);
private static bool ShouldPush(PlayServicesManifest localManifest, PlayServicesManifest remoteManifest)
{
return !ShouldPull(localManifest) && remoteManifest.LastSyncTimestampSeconds < localManifest.LastSyncTimestampSeconds;
}
private static bool ShouldPull(PlayServicesManifest localManifest)
{
return localManifest.LastUpdateTimestampSeconds < localManifest.LastSyncTimestampSeconds;
}
