public void SetNewHashFunction(LSHashFunction hashFunction)
{
lock (accessLock)
{
Dictionary<CustomBitArray, LSHashTableCell> oldValues = _values;
_values = new Dictionary<CustomBitArray, LSHashTableCell>();
_hashFunction = hashFunction;
//Re-hash all the old tweets using the new hash function
foreach (LSHashTableCell oldCell in oldValues.Values)
{
foreach (LSHashTweet tweet in oldCell.GetTweets())
{
bool anyTrue = false;
CustomBitArray hash = _hashFunction.CalculateHashScore(tweet.Vector, out anyTrue);
LSHashTableCell cell;
if (_values.TryGetValue(hash, out cell))
{
cell.Add(tweet);
}
else
{
cell = new LSHashTableCell(_cellCapacity);
cell.Add(tweet);
_values.Add(hash, cell);
}
}
}
}
}
public void SetNewHashFunction(LSHashFunction hashFunction)
{
lock (accessLock)
{
Dictionary <CustomBitArray, LSHashTableCell> oldValues = _values;
_values = new Dictionary <CustomBitArray, LSHashTableCell>();
_hashFunction = hashFunction;
//Re-hash all the old tweets using the new hash function
foreach (LSHashTableCell oldCell in oldValues.Values)
{
foreach (LSHashTweet tweet in oldCell.GetTweets())
{
bool anyTrue = false;
CustomBitArray hash = _hashFunction.CalculateHashScore(tweet.Vector, out anyTrue);
LSHashTableCell cell;
if (_values.TryGetValue(hash, out cell))
{
cell.Add(tweet);
}
else
{
cell = new LSHashTableCell(_cellCapacity);
cell.Add(tweet);
_values.Add(hash, cell);
}
}
}
}
}
public void UpdateOldestHashFunction()
{
//Create a hash function and hash table
LSHashFunction hashFunc = GetNewHashFunction();
_tables[_nextTableRehashIndex].SetNewHashFunction(hashFunc);
_nextTableRehashIndex = (_nextTableRehashIndex + 1) % Settings.TweetClusterer_TCW_HashTableCount;
}
public void CreateHashTables()
{
for (int i = 0; i < Settings.TweetClusterer_TCW_HashTableCount; i++)
{
Console.Write("Making new hash table");
LSHashFunction hashFunc = GetNewHashFunction();
_tables.Add(new LSHashTable(hashFunc, Settings.TweetClusterer_TCW_HashBinSize));
Console.WriteLine(" done");
}
}
public LSHashTable(LSHashFunction hashFunction, int cellCapacity)
{
_hashFunction = hashFunction;
_cellCapacity = cellCapacity;
}
public LSHashTable(LSHashFunction hashFunction, int cellCapacity)
{
_hashFunction = hashFunction;
_cellCapacity = cellCapacity;
}
