/*
* Creates a new tile.
*
* param producerId the id of the producer of this tile.
* param level the quadtree level of this tile.
* param tx the quadtree x coordinate of this tile.
* param ty the quadtree y coordinate of this tile.
* param task the task that will produce the tile data.
*/
public Tile(int producerId, int level, int tx, int ty, CreateTileTask task)
{
m_producerId = producerId;
m_level = level;
m_tx = tx;
m_ty = ty;
m_task = task;
m_users = 0;
if (m_task == null)
{
Debug.Log("Proland::Tile::Tile - task can not be null");
}
}
/*
* Call this if a tile is needed. Will move the tile from the unused to the used cache if its is found there.
* If the tile is not found then a new tile will be created with a new slot. If there are no more free
* slots then the cache capacity has not been set to a high enough value and the program must abort.
*/
public Tile GetTile(int producerId, int level, int tx, int ty)
{
//If this producer id does not exist can not create tile.
if (!m_producers.ContainsKey(producerId))
{
Debug.Log("Proland::TileCache::GetTile - Producer id not been inserted into cache");
return(null);
}
Tile.TId id = Tile.GetTId(producerId, level, tx, ty);
Tile tile = null;
//If tile is not in the used cache
if (!m_usedTiles.ContainsKey(id))
{
//If tile is also not in the unused cache
if (!m_unusedTiles.ContainsKey(id))
{
List <TileStorage.Slot> slot = NewSlot();
//if there are no more free slots then start recyling slots from the unused tiles
if (slot == null && !m_unusedTiles.Empty())
{
//Remove the tile and recylce its slot
slot = m_unusedTiles.RemoveFirst().GetSlot();
}
//If a slot is found create a new tile with a new task
if (slot != null)
{
CreateTileTask task = m_producers[producerId].CreateTile(level, tx, ty, slot);
tile = new Tile(producerId, level, tx, ty, task);
}
//If a free slot is not found then program has must abort. Try setting the cache capacity to higher value.
if (slot == null)
{
throw new CacheCapacityException("No more free slots found. Insufficient storage capacity for cache " + name);
}
}
else
{
//else if the tile is in the unused cache remove it and keep a reference to it
tile = m_unusedTiles.Remove(id);
}
if (tile != null)
{
m_usedTiles.Add(id, tile);
}
}
else
{
tile = m_usedTiles[id];
}
//Should never be null be this stage
if (tile == null)
{
throw new System.ArgumentNullException("Tile should not be null");
}
//Keep track of the max number of tiles ever used for debug purposes
if (m_usedTiles.Count > m_maxUsedTiles)
{
m_maxUsedTiles = m_usedTiles.Count;
}
//inc the num of users
tile.IncrementUsers();
return(tile);
}
