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// rec.h
/* TODO for _RECSTORE
_ support > 2GB data per file
_ multiple files, not just indexes.dat
_ lazier writes?
_ configurable cache size
_ fix on abnormal terminations to be able to restart some
*/
#pragma once
#include "reci.h"
#include "reccache.h"
namespace mongo {
/* --------------------------------------------------------------------------
A RecStoreInterface for the normal mongo mem mapped file (MongoDataFile)
storage
*/
class MongoMemMapped_RecStore : public RecStoreInterface {
public:
static char* get(DiskLoc d, unsigned len) { return d.rec()->data; }
static DiskLoc insert(const char *ns, const void *obuf, int len, bool god) {
return theDataFileMgr.insert(ns, obuf, len, god);
}
static void modified(DiskLoc d) { }
};
/* An in memory RecStoreInterface implementation ----------------------------
*/
class InMem_RecStore : public RecStoreInterface {
enum { INMEMFILE = 0x70000000 };
public:
static char* get(DiskLoc d, unsigned len) {
assert( d.a() == INMEMFILE );
#ifdef __LP64__
massert("64 bit not done", false);
return 0;
#else
return (char *) d.getOfs();
#endif
}
static DiskLoc insert(const char *ns, const void *obuf, int len, bool god) {
#ifdef __LP64__
assert( 0 );
throw -1;
#else
char *p = (char *) malloc(len);
assert( p );
memcpy(p, obuf, len);
int b = (int) p;
assert( b > 0 );
return DiskLoc(INMEMFILE, b);
#endif
}
static void modified(DiskLoc d) { }
};
/* Glue btree to RecStoreInterface
*/
// pick your store for indexes by setting this typedef
#if defined(_RECSTORE)
typedef BasicCached_RecStore BtreeStore;
#else
typedef MongoMemMapped_RecStore BtreeStore;
//typedef InMem_RecStore BtreeStore;
#endif
const int BucketSize = 8192;
inline BtreeBucket* DiskLoc::btree() const {
assert( fileNo != -1 );
return (BtreeBucket*) BtreeStore::get(*this, BucketSize);
}
inline BtreeBucket* DiskLoc::btreemod() const {
assert( fileNo != -1 );
BtreeBucket *b = (BtreeBucket*) BtreeStore::get(*this, BucketSize);
BtreeStore::modified(*this);
return b;
}
}
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