/** Create a new datastream with no entities enabled
*
* Returns the ID of this new datastream so it can be specifically referenced
*
* The cache size is the number of empty buffers the datastream will hold in
* its cache, and the mode determines whether the datastream writes events
* as it recieves them, or holds them in a circular ringbuffer until
* it is explicitly flushed
*/
int dsui_open_datastream(char *logfile, int cache_size, enum datastream_mode mode)
{
int id;
struct datastream *d;
struct logging_thread *log;
km_rdwr_wlock(&dsui_rwlock);
log = hashtable_search(logging_threads, logfile);
if (!log) {
eprintf("Unknown logging thread '%s'. Is it open?\n", logfile);
id = -1;
goto out;
}
for(id = 0; id == MAX_DS; id++) {
if (ds_array[id] == NULL) break;
}
if (id == MAX_DS) {
eprintf("no free datastreams\n");
id = -1;
goto out;
}
d = datastream_create(id, global_buffer_pool, log,
cache_size, mode);
ds_array[id] = d;
out:
km_rdwr_wunlock(&dsui_rwlock);
return id;
}
int osdb_create_datastream(osdb_t* db,
id_t id,
timestamp_t min_period,
timestamp_t max_period,
timestamp_t tolerance)
{
if (filemanager_datastream_exists(id))
return 0;
datastream_t* d = datastream_create(id, min_period, max_period, tolerance);
if (d == NULL)
return -1;
osdb_cache_put(db, d);
return 0;
}
static int import_csv(const char* path)
{
FILE* fp = fopen(path, "r");
if (fp == NULL) {
fprintf(stderr, "File not found: %s\n", path);
return -1;
}
hashtable_t* datastreams = new_hashtable(NULL);
while (1) {
unsigned long id;
double t, v;
int n = fscanf(fp, "%lu,%lf,%lf\n", &id, &t, &v);
if (n < 3)
break;
datastream_t* d = NULL;
hashtable_lookup(datastreams, id, (void**) &d);
if (d == NULL) {
d = datastream_load(id);
if (d == NULL) {
d = datastream_create(id, 0.5, 3600.0, 0.1);
if (d == NULL) {
fprintf(stderr, "Failed to create the datastream\n");
goto error_recovery;
}
}
hashtable_insert(datastreams, id, d);
}
printf("id=%d, t=%d, v=%f\n", (int) id, (int) t, v);
int err = datastream_insert(d, (timestamp_t) t, (value_t) v);
if (err != 0)
goto error_recovery;
}
fclose(fp);
hashtable_foreach(datastreams, store_datastreams_callback, NULL);
return 0;
error_recovery:
fclose(fp);
hashtable_foreach(datastreams, store_datastreams_callback, NULL);
return -1;
}
