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// ramstore.h
// mmap.h
/* Copyright 2009 10gen Inc.
*
* 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.
*/
extern bool checkNsFilesOnLoad;
class RamStoreFile : public MongoFile {
char name[256];
struct Node {
char *p;
int len;
Node() : len(0) { }
void check();
};
std::map<int,Node> _m;
long _len;
static void validate();
void check();
int _last;
void grow(int offset, int len);
/* maxLen can be -1 for existing data */
void* at(int offset, int maxLen);
protected:
virtual void close() {
cout << "ramstore dealloc not yet implemented" << endl;
if( _len ) {
_len = 0;
}
}
virtual void flush(bool sync) { }
public:
~RamStoreFile();
RamStoreFile();
virtual long length() { return _len; }
class Pointer {
RamStoreFile* _f;
friend class RamStoreFile;
public:
void* at(int offset, int len) {
assert( len <= /*MaxBSONObjectSize*/4*1024*1024 + 128 );
return _f->at(offset,len);
}
void grow(int offset, int len) {
assert( len <= /*MaxBSONObjectSize*/4*1024*1024 + 128 );
_f->grow(offset,len);
}
bool isNull() const { return _f == 0; }
};
Pointer map( const char *filename ) {
assert(false); return Pointer();
}
Pointer map(const char *_filename, long &length, int options=0) {
strncpy(name, _filename, sizeof(name)-1);
Pointer p;
p._f = this;
return p;
}
static bool exists(boost::filesystem::path p) {
return false;
}
};
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