/*
* Class: jmdb_DatabaseWrapper
* Method: envGetMaxReaders
* Signature: (J)I
*/
JNIEXPORT jint JNICALL Java_jmdb_DatabaseWrapper_envGetMaxReaders(JNIEnv *vm,
jclass clazz, jlong envL) {
MDB_env *envC = (MDB_env*) envL;
unsigned int max_readers;
int code = mdb_env_get_maxreaders(envC, &max_readers);
if (code) {
throwDatabaseException(vm, code);
}
return max_readers;
}
DBPriv *DBPrivOpenDB(const char *dbpath, dbid id)
{
DBPriv *db = xcalloc(1, sizeof(DBPriv));
MDB_txn *txn = NULL;
int rc;
rc = pthread_key_create(&db->txn_key, &DestroyTransaction);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not create transaction key. (pthread_key_create: '%s')",
GetErrorStrFromCode(rc));
free(db);
return NULL;
}
rc = mdb_env_create(&db->env);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not create handle for database %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
rc = mdb_env_set_mapsize(db->env, LMDB_MAXSIZE);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not set mapsize for database %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
if (DB_MAX_READERS > 0)
{
rc = mdb_env_set_maxreaders(db->env, DB_MAX_READERS);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not set maxreaders for database %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
}
unsigned int open_flags = MDB_NOSUBDIR;
if (id == dbid_locks
|| (GetAmPolicyHub() && id == dbid_lastseen))
{
open_flags |= MDB_NOSYNC;
}
#ifdef __hpux
/*
* On HP-UX, a unified file cache was not introduced until version 11.31.
* This means that on 11.23 there are separate file caches for mmap()'ed
* files and open()'ed files. When these two are mixed, changes made using
* one mode won't be immediately seen by the other mode, which is an
* assumption LMDB is relying on. The MDB_WRITEMAP flag causes LMDB to use
* mmap() only, so that we stay within one file cache.
*/
open_flags |= MDB_WRITEMAP;
#endif
rc = mdb_env_open(db->env, dbpath, open_flags, 0644);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not open database %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
if (DB_MAX_READERS > 0)
{
int max_readers;
rc = mdb_env_get_maxreaders(db->env, &max_readers);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not get maxreaders for database %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
if (max_readers < DB_MAX_READERS)
{
// LMDB will only reinitialize maxreaders if no database handles are
// open, including in other processes, which is how we might end up
// here.
Log(LOG_LEVEL_VERBOSE, "Failed to set LMDB max reader limit on database '%s', "
"consider restarting CFEngine",
dbpath);
}
}
rc = mdb_txn_begin(db->env, NULL, MDB_RDONLY, &txn);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not open database txn %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
rc = mdb_open(txn, NULL, 0, &db->dbi);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not open database dbi %s: %s",
dbpath, mdb_strerror(rc));
mdb_txn_abort(txn);
goto err;
}
rc = mdb_txn_commit(txn);
if (rc)
{
Log(LOG_LEVEL_ERR, "Could not commit database dbi %s: %s",
dbpath, mdb_strerror(rc));
goto err;
}
return db;
err:
if (db->env)
{
mdb_env_close(db->env);
}
pthread_key_delete(db->txn_key);
free(db);
if (rc == MDB_INVALID)
{
return DB_PRIV_DATABASE_BROKEN;
}
return NULL;
}
