1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// Copyright 2009-present MongoDB, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include <ostream>
#include <sstream>
#include <thread>
#include <vector>
#include <bsoncxx/builder/basic/document.hpp>
#include <bsoncxx/builder/basic/kvp.hpp>
#include <bsoncxx/json.hpp>
#include <bsoncxx/types.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/pool.hpp>
#include <mongocxx/uri.hpp>
#include <examples/macros.hh>
using bsoncxx::builder::basic::kvp;
int EXAMPLES_CDECL main() {
// The mongocxx::instance constructor and destructor initialize and shut down the driver,
// respectively. Therefore, a mongocxx::instance must be created before using the driver and
// must remain alive for as long as the driver is in use.
mongocxx::instance inst{};
mongocxx::uri uri{"mongodb://localhost:27017/?minPoolSize=3&maxPoolSize=3"};
mongocxx::pool pool{uri};
std::vector<std::string> collection_names = {"foo", "bar", "baz"};
std::vector<std::thread> threads{};
for (auto i : {0, 1, 2}) {
auto run = [&](std::int64_t j) {
// Each client and collection can only be used in a single thread.
auto client = pool.acquire();
auto coll = client["test"][collection_names[static_cast<std::size_t>(j)]];
coll.delete_many({});
bsoncxx::types::b_int64 index = {j};
coll.insert_one(bsoncxx::builder::basic::make_document(kvp("x", index)));
if (auto doc =
client["test"][collection_names[static_cast<std::size_t>(j)]].find_one({})) {
// In order to ensure that the newline is printed immediately after the document,
// they need to be streamed to std::cout as a single string.
std::stringstream ss;
ss << bsoncxx::to_json(*doc) << std::endl;
std::cout << ss.str();
}
// The client goes out of scope at the end of the lambda and is returned to the pool.
};
std::thread runner{run, i};
threads.push_back(std::move(runner));
}
for (auto&& runner : threads) {
runner.join();
}
}
|
