/// <summary>
/// Creates a new cache object and pulls existing data from the server.
/// </summary>
/// <returns></returns>
public PreprocessedDataCache CreateCache()
{
PreprocessedDataCache cache = new PreprocessedDataCache(this);
this.PullFromStore(cache, CacheType.NearestNode);
this.PullFromStore(cache, CacheType.DistanceTime);
return cache;
}
/// <summary>
/// Pulls changes from Redis server.
/// </summary>
/// <param name="cache">PreprocessedDataCache object</param>
/// <param name="type">Type of cache</param>
public void PullFromStore(PreprocessedDataCache cache, CacheType type)
{
switch (type)
{
case CacheType.DistanceTime:
{
String setId = cacheId + DISTANCE_TIME_POSTFIX;
HashSet<String> encodedEntries = redisServer.GetAllItemsFromSet(setId);
foreach (String s in encodedEntries)
{
Coordinate c0, c1;
Int32 d, t;
RedisNumberEncoder.DecodeDistanceTime(s, out c0, out c1, out d, out t);
Pair<Coordinate, Coordinate> key = new Pair<Coordinate, Coordinate>(c0, c1);
cache.CachedDistanceTime[key] = new Pair<int, int>(d, t);
}
}
break;
case CacheType.NearestNode:
{
String setId = cacheId + NEAREST_NODE_POSTFIX;
HashSet<String> encodedEntries = redisServer.GetAllItemsFromSet(setId);
foreach (String s in encodedEntries)
{
Coordinate c0, c1;
RedisNumberEncoder.DecodeCoordinatePair(s, out c0, out c1);
cache.CachedNearestNode[c0] = c1;
}
}
break;
}
}
/// <summary>
/// Pushes changes to Redis server.
/// Before calling this method, seriously consider pulling changes first.
/// </summary>
/// <param name="cache">PreprocessedDataCache object</param>
/// <param name="type">Type of cache</param>
public void PushToStore(PreprocessedDataCache cache, CacheType type)
{
switch (type)
{
case CacheType.DistanceTime: // push distance-time entries to redis
{
String setId = cacheId + DISTANCE_TIME_POSTFIX; // set id
try
{
foreach (var kvp in cache.CachedDistanceTimeDelta)
{
String encoded = RedisNumberEncoder.EncodeDistanceTime(kvp.Key.First, kvp.Key.Second, kvp.Value.First, kvp.Value.Second);
redisServer.AddItemToSet(setId, encoded);
}
redisServer.Save(); // write redis data to disk
cache.CachedDistanceTimeDelta.Clear(); // clear unsynced data
}
catch (Exception ex)
{ // oops.. an error..
throw new ProblemLibException(ErrorCodes.RedisConnectionFailed, ex);
}
}
break;
case CacheType.NearestNode:
{
String setId = cacheId + NEAREST_NODE_POSTFIX; // set id
try
{
foreach (var kvp in cache.CachedNearestNodeDelta)
{
String encoded = RedisNumberEncoder.EncodeCoordinatePair(kvp.Key, kvp.Value);
redisServer.AddItemToSet(setId, encoded);
}
redisServer.Save(); // write redis data to disk
cache.CachedNearestNodeDelta.Clear(); // clear unsynced data
}
catch (Exception ex)
{ // oops.. an error..
throw new ProblemLibException(ErrorCodes.RedisConnectionFailed, ex);
}
}
break;
}
}