103 lines
4.3 KiB
C++
103 lines
4.3 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "readers/multishard.hh"
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#include <seastar/core/gate.hh>
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class test_reader_lifecycle_policy
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: public reader_lifecycle_policy_v2
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, public enable_shared_from_this<test_reader_lifecycle_policy> {
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using factory_function = std::function<flat_mutation_reader_v2(
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schema_ptr,
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reader_permit,
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const dht::partition_range&,
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const query::partition_slice&,
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const io_priority_class&,
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tracing::trace_state_ptr,
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mutation_reader::forwarding)>;
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struct reader_context {
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std::optional<reader_concurrency_semaphore> semaphore;
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lw_shared_ptr<const dht::partition_range> range;
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std::optional<const query::partition_slice> slice;
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reader_context() = default;
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reader_context(dht::partition_range range, query::partition_slice slice)
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: range(make_lw_shared<const dht::partition_range>(std::move(range))), slice(std::move(slice)) {
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}
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};
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factory_function _factory_function;
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std::vector<foreign_ptr<std::unique_ptr<reader_context>>> _contexts;
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std::vector<future<>> _destroy_futures;
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bool _evict_paused_readers = false;
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public:
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explicit test_reader_lifecycle_policy(factory_function f, bool evict_paused_readers = false)
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: _factory_function(std::move(f))
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, _contexts(smp::count)
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, _evict_paused_readers(evict_paused_readers) {
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}
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virtual flat_mutation_reader_v2 create_reader(
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schema_ptr schema,
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reader_permit permit,
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const dht::partition_range& range,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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mutation_reader::forwarding fwd_mr) override {
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const auto shard = this_shard_id();
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if (_contexts[shard]) {
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_contexts[shard]->range = make_lw_shared<const dht::partition_range>(range);
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_contexts[shard]->slice.emplace(slice);
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} else {
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_contexts[shard] = make_foreign(std::make_unique<reader_context>(range, slice));
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}
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return _factory_function(std::move(schema), std::move(permit), *_contexts[shard]->range, *_contexts[shard]->slice, pc, std::move(trace_state), fwd_mr);
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}
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void update_read_range(lw_shared_ptr<const dht::partition_range> range) override {
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const auto shard = this_shard_id();
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assert(_contexts[shard]);
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_contexts[shard]->range = std::move(range);
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}
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virtual future<> destroy_reader(stopped_reader reader) noexcept override {
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auto& ctx = _contexts[this_shard_id()];
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auto reader_opt = ctx->semaphore->unregister_inactive_read(std::move(reader.handle));
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auto ret = reader_opt ? reader_opt->close() : make_ready_future<>();
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return ret.finally([&ctx] {
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return ctx->semaphore->stop().finally([&ctx] {
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ctx.release();
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});
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});
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}
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virtual reader_concurrency_semaphore& semaphore() override {
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const auto shard = this_shard_id();
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if (!_contexts[shard]) {
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_contexts[shard] = make_foreign(std::make_unique<reader_context>());
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} else if (_contexts[shard]->semaphore) {
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return *_contexts[shard]->semaphore;
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}
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// To support multiple reader life-cycle instances alive at the same
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// time, incorporate `this` into the name, to make their names unique.
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auto name = format("tests::reader_lifecycle_policy@{}@shard_id={}", fmt::ptr(this), shard);
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if (_evict_paused_readers) {
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// Create with no memory, so all inactive reads are immediately evicted.
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_contexts[shard]->semaphore.emplace(reader_concurrency_semaphore::for_tests{}, std::move(name), 1, 0);
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} else {
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_contexts[shard]->semaphore.emplace(reader_concurrency_semaphore::no_limits{}, std::move(name));
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}
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return *_contexts[shard]->semaphore;
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}
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virtual future<reader_permit> obtain_reader_permit(schema_ptr schema, const char* const description, db::timeout_clock::time_point timeout) override {
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return semaphore().obtain_permit(schema.get(), description, 128 * 1024, timeout);
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}
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};
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