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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file yapf_costcache.hpp Caching of segment costs. */
#ifndef YAPF_COSTCACHE_HPP
#define YAPF_COSTCACHE_HPP
#include "../../date_func.h"
/**
* CYapfSegmentCostCacheNoneT - the formal only yapf cost cache provider that implements
* PfNodeCacheFetch() and PfNodeCacheFlush() callbacks. Used when nodes don't have CachedData
* defined (they don't count with any segment cost caching).
*/
template <class Types>
class CYapfSegmentCostCacheNoneT
{
public:
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
/**
* Called by YAPF to attach cached or local segment cost data to the given node.
* @return true if globally cached data were used or false if local data was used
*/
inline bool PfNodeCacheFetch(Node &n)
{
return false;
}
/**
* Called by YAPF to flush the cached segment cost data back into cache storage.
* Current cache implementation doesn't use that.
*/
inline void PfNodeCacheFlush(Node &n)
{
}
};
/**
* CYapfSegmentCostCacheLocalT - the yapf cost cache provider that implements fake segment
* cost caching functionality for yapf. Used when node needs caching, but you don't want to
* cache the segment costs.
*/
template <class Types>
class CYapfSegmentCostCacheLocalT
{
public:
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::CachedData CachedData;
typedef typename CachedData::Key CacheKey;
typedef SmallArray<CachedData> LocalCache;
protected:
LocalCache m_local_cache;
/** to access inherited path finder */
inline Tpf& Yapf()
{
return *static_cast<Tpf *>(this);
}
public:
/**
* Called by YAPF to attach cached or local segment cost data to the given node.
* @return true if globally cached data were used or false if local data was used
*/
inline bool PfNodeCacheFetch(Node &n)
{
CacheKey key(n.GetKey());
Yapf().ConnectNodeToCachedData(n, *new (m_local_cache.Append()) CachedData(key));
return false;
}
/**
* Called by YAPF to flush the cached segment cost data back into cache storage.
* Current cache implementation doesn't use that.
*/
inline void PfNodeCacheFlush(Node &n)
{
}
};
/**
* Base class for segment cost cache providers. Contains global counter
* of track layout changes and static notification function called whenever
* the track layout changes. It is implemented as base class because it needs
* to be shared between all rail YAPF types (one shared counter, one notification
* function.
*/
struct CSegmentCostCacheBase
{
static int s_rail_change_counter;
static void NotifyTrackLayoutChange(TileIndex tile, Track track)
{
s_rail_change_counter++;
}
};
/**
* CSegmentCostCacheT - template class providing hash-map and storage (heap)
* of Tsegment structures. Each rail node contains pointer to the segment
* that contains cached (or non-cached) segment cost information. Nodes can
* differ by key type, but they use the same segment type. Segment key should
* be always the same (TileIndex + DiagDirection) that represent the beginning
* of the segment (origin tile and exit-dir from this tile).
* Different CYapfCachedCostT types can share the same type of CSegmentCostCacheT.
* Look at CYapfRailSegment (yapf_node_rail.hpp) for the segment example
*/
template <class Tsegment>
struct CSegmentCostCacheT : public CSegmentCostCacheBase {
static const int C_HASH_BITS = 14;
typedef CHashTableT<Tsegment, C_HASH_BITS> HashTable;
typedef SmallArray<Tsegment> Heap;
typedef typename Tsegment::Key Key; ///< key to hash table
HashTable m_map;
Heap m_heap;
inline CSegmentCostCacheT() {}
/** flush (clear) the cache */
inline void Flush()
{
m_map.Clear();
m_heap.Clear();
}
inline Tsegment& Get(Key &key, bool *found)
{
Tsegment *item = m_map.Find(key);
if (item == NULL) {
*found = false;
item = new (m_heap.Append()) Tsegment(key);
m_map.Push(*item);
} else {
*found = true;
}
return *item;
}
};
/**
* CYapfSegmentCostCacheGlobalT - the yapf cost cache provider that adds the segment cost
* caching functionality to yapf. Using this class as base of your will provide the global
* segment cost caching services for your Nodes.
*/
template <class Types>
class CYapfSegmentCostCacheGlobalT : public CYapfSegmentCostCacheLocalT<Types> {
public:
typedef CYapfSegmentCostCacheLocalT<Types> Tlocal;
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::CachedData CachedData;
typedef typename CachedData::Key CacheKey;
typedef CSegmentCostCacheT<CachedData> Cache;
protected:
Cache &m_global_cache;
inline CYapfSegmentCostCacheGlobalT() : m_global_cache(stGetGlobalCache()) {};
/** to access inherited path finder */
inline Tpf& Yapf()
{
return *static_cast<Tpf *>(this);
}
inline static Cache& stGetGlobalCache()
{
static int last_rail_change_counter = 0;
static Date last_date = 0;
static Cache C;
/* some statistics */
if (last_date != _date) {
last_date = _date;
DEBUG(yapf, 2, "Pf time today: %5d ms", _total_pf_time_us / 1000);
_total_pf_time_us = 0;
}
/* delete the cache sometimes... */
if (last_rail_change_counter != Cache::s_rail_change_counter) {
last_rail_change_counter = Cache::s_rail_change_counter;
C.Flush();
}
return C;
}
public:
/**
* Called by YAPF to attach cached or local segment cost data to the given node.
* @return true if globally cached data were used or false if local data was used
*/
inline bool PfNodeCacheFetch(Node &n)
{
if (!Yapf().CanUseGlobalCache(n)) {
return Tlocal::PfNodeCacheFetch(n);
}
CacheKey key(n.GetKey());
bool found;
CachedData &item = m_global_cache.Get(key, &found);
Yapf().ConnectNodeToCachedData(n, item);
return found;
}
/**
* Called by YAPF to flush the cached segment cost data back into cache storage.
* Current cache implementation doesn't use that.
*/
inline void PfNodeCacheFlush(Node &n)
{
}
};
#endif /* YAPF_COSTCACHE_HPP */
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