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File: [Development] / JSOC / CM / V1.0 / drms_api.txt (download)
Revision: (vendor branch), Mon Oct 1 23:12:21 2007 UTC (15 years, 8 months ago) by arta
Branch: Vtag, MAIN
CVS Tags: Ver_LATEST, Ver_9-5, Ver_9-41, Ver_9-4, Ver_9-3, Ver_9-2, Ver_9-1, Ver_9-0, Ver_8-8, Ver_8-7, Ver_8-6, Ver_8-5, Ver_8-4, Ver_8-3, Ver_8-2, Ver_8-12, Ver_8-11, Ver_8-10, Ver_8-1, Ver_8-0, Ver_7-1, Ver_7-0, Ver_6-4, Ver_6-3, Ver_6-2, Ver_6-1, Ver_6-0, Ver_5-9, Ver_5-8, Ver_5-7, Ver_5-6, Ver_5-5, Ver_5-3, Ver_5-2, Ver_5-14, Ver_5-13, Ver_5-12, Ver_5-11, Ver_5-10, Ver_5-1, Ver_5-0, Ver_4-7, Ver_4-6, Ver_4-5, Ver_4-4, Ver_4-3, Ver_4-2, Ver_4-1, Ver_4-0, NewTree01_cp09_JSOC, NewTree01_cp08_JSOC, NewTree01_cp07_JSOC, NewTree01_cp06_JSOC, NewTree01_cp05_JSOC, NewTree01_cp04_JSOC, NewTree01_cp03_JSOC, NewTree01_cp02_JSOC, NewTree01_cp01_JSOC, NetDRMS_Ver_LATEST, NetDRMS_Ver_9-5, NetDRMS_Ver_9-41, NetDRMS_Ver_9-4, NetDRMS_Ver_9-3, NetDRMS_Ver_9-2, NetDRMS_Ver_9-1, NetDRMS_Ver_9-0, NetDRMS_Ver_8-8, NetDRMS_Ver_8-7, NetDRMS_Ver_8-6, NetDRMS_Ver_8-5, NetDRMS_Ver_8-4, NetDRMS_Ver_8-12, NetDRMS_Ver_8-11, NetDRMS_Ver_8-10, HEAD
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First new, reorganized JSOC tree

=================== DRMS data types and structures ==================

For full definitions see jsoc/src/base/libdrms/drms_types.h

Main DRMS types visible to a module:

 DRMS_Type_t      : Basic scalar and string type enumerator.
 DRMS_Type_Value_t: Basic scalar and string values.

 DRMS_Record_t    : A single data record.
 DRMS_Keyword_t   : A record keyword (meta-data, headers)
 DRMS_Link_t      : A record link (links to other records)
 DRMS_Segment_t   : A record data segment holding bulk data of the record
 DRMS_Array_t     : A generic array of scalar values or strings. Used to
                    access the contents of a segment.
 DRMS_RecordSet_t : A set of data records.

DMRS types used internally:

 DRMS_Env_t       : The main DRMS environment. Contains information about the
                    DRMS session as well as caches of records, storage units
                    and series template records. In the DRMS server it 
                    contains mutexes (locks), signal masks and other data 
                    structures synchronize the server threads and allowing 
                    them to communicate.                    
 DRMS_Session_t   : A DRMS session handle. Holds information about the 
                    connection to a DRMS server.
 DRMS_ThreadInfo_t: Information passed to a thread in the DRMS server when 
                    it is spawned to service a new client.
 DRMS_SumRequest_t: Structure used to pass requests regarding storage units to
                    the designated SUMS communications thread in the server.

============ Record and RecordSet functions ===============

For full definitions see jsoc/src/base/libdrms/drms_record.{c,h}.

/* drms_open_records: Retrieve a recordset specified by the DRMS
   dataset name string given in the argument "datasetname". The
   records are inserted into the record cache and marked read-only. */
DRMS_RecordSet_t *drms_open_records(DRMS_Env_t *env, char *recordsetname, 
int *status);

/* drms_clone_records: Clone a set of records, i.e. create a new set
   of records and copy the value of keywords, links and segments from
   the pre-existing records given in "rs".  If
   mode=DRMS_SHARE_SEGMENTS the new segments will share segment files
   with the old records, i.e. it will have the same storage unit
   number, and only keyword and link data will be replicated.  If
   mode=DRMS_COPY_SEGMENTS the segment files for the old records will
   be copied to a new storage unit slots and assigned to the new
   records. */
DRMS_RecordSet_t *drms_clone_records(DRMS_RecordSet_t *recset, int mode, 
				     int *status);

/* drms_create_records: Create a new set of n records. Fill keywords,
   links and segments with their default values from the series
   definition. Each record will be assigned a new storage unit slot to
   store its segment files in. */
DRMS_RecordSet_t *drms_create_records(DRMS_Env_t *env, int n, char *seriesname,
				      int *status);

/* drms_close_records: Close a set of records. 
   1. a) If action=DRMS_COMMIT_RECORD the record meta-data (keywords
      and links) will be inserted into the database and the data
      segments will be left in the storage unit directory for later
      archiving by SUMS. NOTICE: The records will only be comitted 
      permanently to the database if the session finishes without
      b) If action=DRMS_DISCARD_RECORD the data segment files are
      deleted from disk.
   2. The record structures are freed from the record cache. */
int drms_close_records(DRMS_RecordSet_t *rs, int action);

/* drms_closeall_records: Execute drms_close_record for all records in
   the record cache that are not marked read-only, i.e. which were
   created by the present program. */
int drms_closeall_records(DRMS_Env_t *env, int action);

/* drms_record_print: Print the contents of a record data structure to
   stdout. */
void  drms_record_print(DRMS_Record_t *rec);

/* Calculate size of a record and its segment arrays in bytes. */
long long drms_record_size(DRMS_Record_t *rec);

/* Single record versions: */
DRMS_Record_t *drms_clone_record(DRMS_Record_t *record, int mode, int *status);
DRMS_Record_t *drms_create_record(DRMS_Env_t *env, char *seriesname, 
				  int *status);
int drms_close_record(DRMS_Record_t *rec, int action);

======================== Keyword functions ========================

For full definitions see jsoc/src/base/libdrms/drms_keyword.{c,h}.

/* Versions with type conversion. */
char drms_getkey_char(DRMS_Record_t *rec, const char *key,int *status);
short drms_getkey_short(DRMS_Record_t *rec, const char *key, int *status);
int drms_getkey_int(DRMS_Record_t *rec, const char *key, int *status);
long long drms_getkey_longlong(DRMS_Record_t *rec, const char *key, int *status);
float drms_getkey_float(DRMS_Record_t *rec, const char *key, int *status);
double drms_getkey_double(DRMS_Record_t *rec, const char *key, int *status);
char *drms_getkey_string(DRMS_Record_t *rec, const char *key, int *status);

/* Generic version. */
DRMS_Type_Value_t drms_getkey(DRMS_Record_t *rec, const char *key, 
				DRMS_Type_t *type, int *status);

/* Versions with type conversion. */
int drms_setkey_char(DRMS_Record_t *rec, const char *key, char value);
int drms_setkey_short(DRMS_Record_t *rec, const char *key, short value);
int drms_setkey_int(DRMS_Record_t *rec, const char *key, int value);
int drms_setkey_longlong(DRMS_Record_t *rec, const char *key, long long value);
int drms_setkey_float(DRMS_Record_t *rec, const char *key, float value);
int drms_setkey_double(DRMS_Record_t *rec, const char *key, double value);
int drms_setkey_string(DRMS_Record_t *rec, const char *key, char *value);

/* Generic version. */
int drms_setkey(DRMS_Record_t *rec, const char *key, DRMS_Type_t type, 
		DRMS_Type_Value_t *value);

=== Utility keyword functions: ===
/* drms_keyword_print: Print all fields of the DRMS_Keyword_t struct 
   to stdout. */
void drms_keyword_print(DRMS_Keyword_t *key);
/* drms_keyword_printval: print formatted keyword value to stdout. */
void drms_keyword_printval(DRMS_Keyword_t *key);
DRMS_Keyword_t *drms_keyword_lookup(DRMS_Record_t *rec, const char *key);

======================== Link functions ========================

For full definitions see jsoc/src/base/libdrms/drms_link.{c,h}.

/* Set a static link to point to the record with absolute 
   record number "recnum" in the target series of link "linkname"
   associated with record "rec". */
int drms_setlink_static(DRMS_Record_t *rec, const char *linkname, int recnum);

/* Set a dynamic link to point to the record(s) with primary index values
   mathing those given in the "types" and "values" arrays. When a dynamic
   link is resolved the record with the highest record number of the ones
   matching the primary index is selected. */
int drms_setlink_dynamic(DRMS_Record_t *rec, const char *linkname, 
			 DRMS_Type_t *types, DRMS_Type_Value_t *values);

/* Follow a link to its destination record, retrieve it and return a 
   pointer to it. */
DRMS_Record_t *drms_link_follow(DRMS_Record_t *rec, const char *linkname, 
				int *status);

=== Utility Link functions: ===
/* Print the contents of a link structure to stdout. */
void drms_link_print(DRMS_Link_t *link);

======================== Segment functions ========================

For full definitions see jsoc/src/base/libdrms/drms_segment.{c,h}.

Storage protocols currently supported: 
   DRMS_BINARY: Raw binary format
   DRMS_BINZIP: GZIP compressed raw binary format.

/* drms_segment_readraw: Read the data coresponding to the segment
   argument from file.  the data values will be read into an array of
   the same type that the segment values are stored on disk and no
   scaling will be done. */
DRMS_Array_t *drms_segment_readraw(DRMS_Segment_t *seg, int *status);

/* drms_segment_writeraw: Write the array argument to the (partial)
   file occupied by the segment argument. The array dimension and type
   must match the segment type and dimension. */
int drms_segment_writeraw(DRMS_Segment_t *seg, DRMS_Array_t *arr);

=== Utility Segment functions: ===
/* Print the fields of a keyword struct to stdout. */
void drms_segment_print(DRMS_Segment_t *seg)
/* Calculate segment size in bytes. */
long long drms_segment_size(DRMS_Segment_t *seg)
/* Look up a segment structure by name and return a pointer to it. */
DRMS_Segment_t *drms_segment_lookup(DRMS_Record_t *rec, const char *segname)

Karen Tian
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