mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-11-27 07:30:33 +08:00
5fa2defc7e
Prior to this PR, DAP4 always fetched the whole (constrained) dataset This PR changes the query processing so 1. It reads data on a per-variable request (equivalent to calling nc_get_var()). 2. It tracks a response for every query. Most of the changes reflect having to do per-variable requests. In any case, doing all this significantly reduces the amount of data transmitted and hence speeds up DAP4 requests.
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/* Copyright 2003-2018, University Corporation for Atmospheric
|
|
* Research. See COPYRIGHT file for copying and redistribution
|
|
* conditions. */
|
|
|
|
/**
|
|
* @file
|
|
* @internal The netCDF-4 file functions relating to file creation.
|
|
*
|
|
* @author Dennis Heimbigner, Ed Hartnett
|
|
*/
|
|
|
|
#include "zincludes.h"
|
|
|
|
/** @internal These flags may not be set for create. */
|
|
static const int ILLEGAL_CREATE_FLAGS = (NC_NOWRITE|NC_MMAP|NC_DISKLESS|NC_64BIT_OFFSET|NC_CDF5);
|
|
|
|
/**
|
|
* @internal Create a netCDF-4/NCZ file.
|
|
*
|
|
* @param path The file name of the new file.
|
|
* @param cmode The creation mode flag.
|
|
* @param initialsz The proposed initial file size (advisory)
|
|
* @param nc Pointer to an instance of NC.
|
|
*
|
|
* @return ::NC_NOERR No error.
|
|
* @return ::NC_EINVAL Invalid input (check cmode).
|
|
* @return ::NC_EEXIST File exists and NC_NOCLOBBER used.
|
|
* @return ::NC_EHDFERR ZARR returned error.
|
|
* @ingroup netcdf4
|
|
* @author Dennis Heimbigner, Ed Hartnett
|
|
*/
|
|
static int
|
|
ncz_create_file(const char *path, int cmode, size_t initialsz, NClist* controls, int ncid)
|
|
{
|
|
int retval = NC_NOERR;
|
|
NC_FILE_INFO_T* h5 = NULL;
|
|
|
|
assert(path);
|
|
LOG((3, "%s: path %s mode 0x%x", __func__, path, cmode));
|
|
|
|
/* Add necessary structs to hold netcdf-4 file data. */
|
|
if ((retval = nc4_file_list_add(ncid, path, cmode, (void**)&h5)))
|
|
BAIL(retval);
|
|
assert(h5 && h5->root_grp);
|
|
h5->root_grp->atts_read = 1;
|
|
|
|
h5->mem.inmemory = ((cmode & NC_INMEMORY) == NC_INMEMORY);
|
|
h5->mem.diskless = ((cmode & NC_DISKLESS) == NC_DISKLESS);
|
|
h5->mem.persist = ((cmode & NC_PERSIST) == NC_PERSIST);
|
|
|
|
/* Do format specific setup */
|
|
|
|
if((retval = ncz_create_dataset(h5,h5->root_grp,controls)))
|
|
BAIL(retval);
|
|
|
|
/* Define mode gets turned on automatically on create. */
|
|
h5->flags |= NC_INDEF;
|
|
|
|
/* Set provenance. */
|
|
if ((retval = NCZ_new_provenance(h5)))
|
|
BAIL(retval);
|
|
|
|
return NC_NOERR;
|
|
|
|
exit: /*failure exit*/
|
|
if(retval && h5)
|
|
ncz_closeorabort(h5, NULL, 1); /* treat like abort */
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* @internal Create a netCDF-4/NCZ file.
|
|
*
|
|
* @param path The file name of the new file.
|
|
* @param cmode The creation mode flag.
|
|
* @param initialsz Ignored by this function.
|
|
* @param basepe Ignored by this function.
|
|
* @param chunksizehintp Ignored by this function.
|
|
* @param parameters pointer to struct holding extra data (e.g. for
|
|
* parallel I/O) layer. Ignored if NULL.
|
|
* @param dispatch Pointer to the dispatch table for this file.
|
|
* @param nc_file Pointer to an instance of NC.
|
|
*
|
|
* @return ::NC_NOERR No error.
|
|
* @return ::NC_EINVAL Invalid input (check cmode).
|
|
* @ingroup netcdf4
|
|
* @author Dennis Heimbigner, Ed Hartnett
|
|
*/
|
|
int
|
|
NCZ_create(const char* path, int cmode, size_t initialsz, int basepe,
|
|
size_t *chunksizehintp, void *parameters,
|
|
const NC_Dispatch *dispatch, int ncid)
|
|
{
|
|
int stat = NC_NOERR;
|
|
NCURI* uri = NULL;
|
|
|
|
ZTRACE(0,"path=%s,cmode=%d,initialsz=%ld,ncid=%d)",path,cmode,initialsz,ncid);
|
|
|
|
NC_UNUSED(parameters);
|
|
|
|
assert(path);
|
|
|
|
LOG((1, "%s: path %s cmode 0x%x ncid %d",
|
|
__func__, path, cmode ,ncid));
|
|
|
|
/* If this is our first file, initialize */
|
|
if (!ncz_initialized) NCZ_initialize();
|
|
|
|
#ifdef LOGGING
|
|
/* If nc logging level has changed, see if we need to turn on
|
|
* NCZ's error messages. */
|
|
NCZ_set_log_level();
|
|
#endif /* LOGGING */
|
|
|
|
/* Check the cmode for validity. */
|
|
if((cmode & ILLEGAL_CREATE_FLAGS) != 0)
|
|
{stat = NC_EINVAL; goto done;}
|
|
|
|
/* Turn on NC_WRITE */
|
|
cmode |= NC_WRITE;
|
|
|
|
/* Get the controls */
|
|
ncuriparse(path,&uri);
|
|
if(uri == NULL) goto done;
|
|
|
|
/* Create the file */
|
|
stat = ncz_create_file(path, cmode, initialsz, ncurifragmentparams(uri), ncid);
|
|
|
|
done:
|
|
ncurifree(uri);
|
|
return ZUNTRACE(stat);
|
|
}
|