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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __UTIL_CACHE_H__
#define __UTIL_CACHE_H__
/* Disk Cache based on Hashing
*
* To be used to cache expensive computations. The hash key is created from an
* arbitrary number of bytes, by hashing the bytes using MD5, which then gives
* the file name containing the data. This data then is read from the file
* again into the appropriate data structures.
*
* This way we do not need to accurately track changes, compare dates and
* invalidate cache entries, at the cost of extra computation. If everything
* is stored in a global cache, computations can perhaps even be shared between
* different scenes where it may be hard to detect duplicate work.
*/
#include "util_set.h"
#include "util_string.h"
#include "util_vector.h"
CCL_NAMESPACE_BEGIN
class CacheBuffer {
public:
const void *data;
size_t size;
CacheBuffer(const void *data_, size_t size_)
{ data = data_; size = size_; }
};
class CacheData {
public:
vector<CacheBuffer> buffers;
string name;
string filename;
bool have_filename;
FILE *f;
CacheData(const string& name = "");
~CacheData();
const string& get_filename();
template<typename T> void add(const vector<T>& data)
{
CacheBuffer buffer(data.size()? &data[0]: NULL, data.size()*sizeof(T));
buffers.push_back(buffer);
}
template<typename T> void add(const array<T>& data)
{
CacheBuffer buffer(data.size()? &data[0]: NULL, data.size()*sizeof(T));
buffers.push_back(buffer);
}
void add(const void *data, size_t size)
{
if(size) {
CacheBuffer buffer(data, size);
buffers.push_back(buffer);
}
}
void add(const int& data)
{
CacheBuffer buffer(&data, sizeof(int));
buffers.push_back(buffer);
}
void add(const float& data)
{
CacheBuffer buffer(&data, sizeof(float));
buffers.push_back(buffer);
}
void add(const size_t& data)
{
CacheBuffer buffer(&data, sizeof(size_t));
buffers.push_back(buffer);
}
template<typename T> bool read(array<T>& data)
{
size_t size;
if(!fread(&size, sizeof(size), 1, f)) {
fprintf(stderr, "Failed to read vector size from cache.\n");
return false;
}
if((size == 0) || (size % sizeof(T)) != 0)
return false;
data.resize(size/sizeof(T));
if(!fread(&data[0], size, 1, f)) {
fprintf(stderr, "Failed to read vector data from cache (%lu).\n", (unsigned long)size);
return false;
}
return true;
}
bool read(int& data)
{
size_t size;
if(!fread(&size, sizeof(size), 1, f)) {
fprintf(stderr, "Failed to read int size from cache.\n");
return false;
}
if(!fread(&data, sizeof(data), 1, f)) {
fprintf(stderr, "Failed to read int from cache.\n");
return false;
}
return true;
}
bool read(float& data)
{
size_t size;
if(!fread(&size, sizeof(size), 1, f)) {
fprintf(stderr, "Failed to read float size from cache.\n");
return false;
}
if(!fread(&data, sizeof(data), 1, f)) {
fprintf(stderr, "Failed to read float from cache.\n");
return false;
}
return true;
}
bool read(size_t& data)
{
size_t size;
if(!fread(&size, sizeof(size), 1, f)) {
fprintf(stderr, "Failed to read size_t size from cache.\n");
return false;
}
if(!fread(&data, sizeof(data), 1, f)) {
fprintf(stderr, "Failed to read size_t from cache.\n");
return false;
}
return true;
}
};
class Cache {
public:
static Cache global;
void insert(CacheData& key, CacheData& value);
bool lookup(CacheData& key, CacheData& value);
void clear_except(const string& name, const set<string>& except);
protected:
string data_filename(CacheData& key);
};
CCL_NAMESPACE_END
#endif /* __UTIL_CACHE_H__ */
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