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edgeColoring.c
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edgeColoring.c
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/*PGR-GNU*****************************************************************
File: edgeColoring.c
Generated with Template by:
Copyright (c) 2021 pgRouting developers
Mail: [email protected]
Function's developer:
Copyright (c) 2021 Veenit Kumar
Mail: [email protected]
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
/** @file edgeColoring.c
* @brief Connecting code with postgres.
*
*/
#include <stdbool.h>
#include "c_common/postgres_connection.h"
#include "c_common/debug_macro.h"
#include "c_common/e_report.h"
#include "c_common/time_msg.h"
#include "c_common/pgdata_getters.h"
#include "c_types/ii_t_rt.h"
#include "drivers/coloring/edgeColoring_driver.h"
PGDLLEXPORT Datum _pgr_edgecoloring(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(_pgr_edgecoloring);
/** @brief Static function, loads the data from postgres to C types for further processing.
*
* It first connects the C function to the SPI manager. Then converts
* the postgres array to C array and loads the edges belonging to the graph
* in C types. Then it calls the function `do_pgr_edgeColoring` defined
* in the `edgeColoring_driver.h` file for further processing.
* Finally, it frees the memory and disconnects the C function to the SPI manager.
*
* @param edges_sql the edges of the SQL query
* @param result_tuples the rows in the result
* @param result_count the count of rows in the result
*/
static
void
process(
char* edges_sql,
II_t_rt **result_tuples,
size_t *result_count) {
pgr_SPI_connect();
char* log_msg = NULL;
char* notice_msg = NULL;
char* err_msg = NULL;
(*result_tuples) = NULL;
(*result_count) = 0;
Edge_t *edges = NULL;
size_t total_edges = 0;
pgr_get_edges(edges_sql, &edges, &total_edges, true, false, &err_msg);
throw_error(err_msg, edges_sql);
if (total_edges == 0) {
ereport(WARNING,
(errmsg("Insufficient data found on inner query."),
errhint("%s", edges_sql)));
(*result_count) = 0;
(*result_tuples) = NULL;
pgr_SPI_finish();
return;
}
clock_t start_t = clock();
do_pgr_edgeColoring(
edges, total_edges,
result_tuples,
result_count,
&log_msg,
¬ice_msg,
&err_msg);
time_msg("processing pgr_edgeColoring", start_t, clock());
if (err_msg && (*result_tuples)) {
pfree(*result_tuples);
(*result_tuples) = NULL;
(*result_count) = 0;
}
pgr_global_report(log_msg, notice_msg, err_msg);
if (log_msg) pfree(log_msg);
if (notice_msg) pfree(notice_msg);
if (err_msg) pfree(err_msg);
if (edges) pfree(edges);
pgr_SPI_finish();
}
/* */
/******************************************************************************/
/** @brief Helps in converting postgres variables to C variables, and returns the result.
*
*/
PGDLLEXPORT Datum _pgr_edgecoloring(PG_FUNCTION_ARGS) {
FuncCallContext *funcctx;
TupleDesc tuple_desc;
/**********************************************************************/
II_t_rt *result_tuples = NULL;
size_t result_count = 0;
/**********************************************************************/
if (SRF_IS_FIRSTCALL()) {
MemoryContext oldcontext;
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/***********************************************************************
*
* pgr_edgeColoring(edges_sql TEXT);
*
**********************************************************************/
process(
text_to_cstring(PG_GETARG_TEXT_P(0)),
&result_tuples,
&result_count);
/**********************************************************************/
funcctx->max_calls = result_count;
funcctx->user_fctx = result_tuples;
if (get_call_result_type(fcinfo, NULL, &tuple_desc)
!= TYPEFUNC_COMPOSITE) {
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
}
funcctx->tuple_desc = tuple_desc;
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
tuple_desc = funcctx->tuple_desc;
result_tuples = (II_t_rt*) funcctx->user_fctx;
if (funcctx->call_cntr < funcctx->max_calls) {
HeapTuple tuple;
Datum result;
Datum *values;
bool* nulls;
/***********************************************************************
*
* OUT edge BIGINT
* OUT color BIGINT
*
**********************************************************************/
size_t num = 3;
values = palloc(num * sizeof(Datum));
nulls = palloc(num * sizeof(bool));
size_t i;
for (i = 0; i < num; ++i) {
nulls[i] = false;
}
values[0] = Int64GetDatum(result_tuples[funcctx->call_cntr].d1.id);
values[1] = Int64GetDatum(result_tuples[funcctx->call_cntr].d2.value);
/**********************************************************************/
tuple = heap_form_tuple(tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
} else {
SRF_RETURN_DONE(funcctx);
}
}