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December 8, 2018 17:58
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TIleDB backend to save/load Armadillo objects
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/** | |
* @file quickstart_dense.cc | |
* | |
* @section LICENSE | |
* | |
* The MIT License | |
* | |
* @copyright Copyright (c) 2018 TileDB, Inc. | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining a copy | |
* of this software and associated documentation files (the "Software"), to deal | |
* in the Software without restriction, including without limitation the rights | |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
* copies of the Software, and to permit persons to whom the Software is | |
* furnished to do so, subject to the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included in | |
* all copies or substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
* THE SOFTWARE. | |
* | |
* @section DESCRIPTION | |
* | |
* This is a part of the TileDB quickstart tutorial: | |
* https://docs.tiledb.io/en/latest/tutorials/quickstart.html | |
* | |
* When run, this program will create a simple 2D dense array, write some data | |
* to it, and read a slice of the data back. | |
* | |
*/ | |
#include <iostream> | |
#include <tiledb/tiledb> | |
#include <armadillo> | |
using namespace tiledb; | |
// Name of array. | |
std::string array_name("quickstart_dense_array"); | |
void create_array() { | |
// Create a TileDB context. | |
Context ctx; | |
// The array will be 4x4 with dimensions "rows" and "cols", with domain [1,4]. | |
Domain domain(ctx); | |
domain.add_dimension(Dimension::create<int>(ctx, "rows", {{1, 4}}, 4)) | |
.add_dimension(Dimension::create<int>(ctx, "cols", {{1, 4}}, 4)); | |
// The array will be dense. | |
ArraySchema schema(ctx, TILEDB_DENSE); | |
schema.set_domain(domain).set_order({{TILEDB_ROW_MAJOR, TILEDB_ROW_MAJOR}}); | |
// Add a single attribute "a" so each (i,j) cell can store an integer. | |
schema.add_attribute(Attribute::create<double>(ctx, "a")); | |
// Create the (empty) array on disk. | |
Array::create(array_name, schema); | |
} | |
void write_array() { | |
Context ctx; | |
// Prepare some data for the array | |
arma::vec armavec = { | |
1., 2., 3., 4., 5., 6., 7., 8., 9., 10., 11., 12., 13., 14., 15., 16.}; | |
// Open the array for writing and create the query. | |
Array array(ctx, array_name, TILEDB_WRITE); | |
Query query(ctx, array, TILEDB_WRITE); | |
query.set_layout(TILEDB_ROW_MAJOR) | |
.set_buffer("a", armavec.memptr(), armavec.n_elem); | |
// Perform the write and close the array. | |
query.submit(); | |
array.close(); | |
} | |
void read_array() { | |
Context ctx; | |
// Prepare the array for reading | |
Array array(ctx, array_name, TILEDB_READ); | |
// Slice only rows 1, 2 and cols 2, 3, 4 | |
const std::vector<int> subarray = {1, 2, 2, 4}; | |
// Prepare the vector that will hold the result (of size 6 elements) | |
arma::vec armavec(6); | |
// Prepare the query | |
Query query(ctx, array, TILEDB_READ); | |
query.set_subarray(subarray) | |
.set_layout(TILEDB_ROW_MAJOR) | |
.set_buffer("a", armavec.memptr(), armavec.n_elem); | |
// Submit the query and close the array. | |
query.submit(); | |
array.close(); | |
armavec.print(); | |
} | |
int main() { | |
Context ctx; | |
if (Object::object(ctx, array_name).type() != Object::Type::Array) { | |
create_array(); | |
write_array(); | |
} | |
read_array(); | |
return 0; | |
} |
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