62 lines
2.4 KiB
C++
62 lines
2.4 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2019 ScyllaDB Ltd.
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*/
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#include <iostream>
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#include <seastar/util/std-compat.hh>
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#include <seastar/core/app-template.hh>
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#include <seastar/core/coroutine.hh>
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#include <seastar/core/fstream.hh>
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#include <seastar/core/sleep.hh>
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#include <seastar/core/seastar.hh>
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#include <seastar/core/loop.hh>
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#include <seastar/core/sstring.hh>
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#include <seastar/coroutine/parallel_for_each.hh>
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int main(int argc, char** argv) {
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seastar::app_template app;
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app.run(argc, argv, [] () -> seastar::future<> {
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std::cout << "this is a completely useless program\nplease stand by...\n";
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auto f = seastar::coroutine::parallel_for_each(std::vector<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }, [] (int i) -> seastar::future<> {
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co_await seastar::sleep(std::chrono::seconds(i));
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std::cout << i << "\n";
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});
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auto file = co_await seastar::open_file_dma("useless_file.txt", seastar::open_flags::create | seastar::open_flags::wo);
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auto out = co_await seastar::make_file_output_stream(file);
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seastar::sstring str = "nothing to see here, move along now\n";
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co_await out.write(str);
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co_await out.flush();
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co_await out.close();
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bool all_exist = true;
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std::vector<seastar::sstring> filenames = { "useless_file.txt", "non_existing" };
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co_await seastar::coroutine::parallel_for_each(filenames, [&all_exist] (const seastar::sstring& name) -> seastar::future<> {
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all_exist &= co_await seastar::file_exists(name);
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});
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std::cout << (all_exist ? "" : "not ") << "all files exist" << std::endl;
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co_await std::move(f);
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std::cout << "done\n";
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});
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}
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