fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*
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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 <seastar/core/shared_ptr.hh>
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#include "shared_sstable.hh"
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namespace sstables {
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struct writer_offset_tracker {
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uint64_t offset = 0;
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};
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class write_monitor {
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public:
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virtual ~write_monitor() { }
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virtual void on_write_started(const writer_offset_tracker&) = 0;
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virtual void on_data_write_completed() = 0;
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};
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write_monitor& default_write_monitor();
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struct reader_position_tracker {
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uint64_t position = 0;
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uint64_t total_read_size = 0;
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};
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class read_monitor {
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public:
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virtual ~read_monitor() { }
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// parameters are the current position in the data file
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virtual void on_read_started(const reader_position_tracker&) = 0;
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virtual void on_read_completed() = 0;
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};
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struct noop_read_monitor final : public read_monitor {
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virtual void on_read_started(const reader_position_tracker&) override {}
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virtual void on_read_completed() override {}
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};
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read_monitor& default_read_monitor();
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struct read_monitor_generator {
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virtual read_monitor& operator()(shared_sstable sst) = 0;
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virtual ~read_monitor_generator() {}
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};
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struct no_read_monitoring final : public read_monitor_generator {
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virtual read_monitor& operator()(shared_sstable sst) override {
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return default_read_monitor();
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};
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};
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read_monitor_generator& default_read_monitor_generator();
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}
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