mirror of
https://github.com/matrix-construct/construct
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111 lines
5.5 KiB
C++
111 lines
5.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_M_ROOM_STATE_H
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/// Interface to room state.
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///
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/// This interface focuses specifically on the details of room state. Most of
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/// the queries to this interface respond in logarithmic time. If an event with
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/// a state_key is present in room::messages but it is not present in
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/// room::state (state tree) it was accepted into the room but we will not
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/// apply it to our machine, though other parties may (this is a
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/// state-conflict).
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///
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struct ircd::m::room::state
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{
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struct opts;
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using keys = std::function<void (const string_view &)>;
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using keys_bool = std::function<bool (const string_view &)>;
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using types = std::function<void (const string_view &)>;
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using types_bool = std::function<bool (const string_view &)>;
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using closure = std::function<void (const string_view &, const string_view &, const event::idx &)>;
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using closure_bool = std::function<bool (const string_view &, const string_view &, const event::idx &)>;
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IRCD_STRONG_TYPEDEF(string_view, type_prefix)
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static conf::item<bool> disable_history;
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static conf::item<size_t> readahead_size;
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room::id room_id;
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event::id::buf event_id;
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m::state::id_buffer root_id_buf;
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m::state::id root_id;
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const event::fetch::opts *fopts {nullptr};
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mutable bool _not_present {false}; // cached result of !present()
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// Check if this object is representing the present state or a past state.
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bool present() const;
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// Iterate the state
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bool for_each(const types_bool &) const;
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void for_each(const types &) const;
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bool for_each(const type_prefix &pref, const types_bool &) const;
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bool for_each(const string_view &type, const keys_bool &view) const;
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void for_each(const string_view &type, const keys &) const;
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bool for_each(const string_view &type, const string_view &lower_bound, const keys_bool &view) const;
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bool for_each(const string_view &type, const string_view &lower_bound, const closure_bool &view) const;
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bool for_each(const string_view &type, const string_view &lower_bound, const event::closure_idx_bool &view) const;
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bool for_each(const string_view &type, const string_view &lower_bound, const event::id::closure_bool &view) const;
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bool for_each(const string_view &type, const string_view &lower_bound, const event::closure_bool &view) const;
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bool for_each(const string_view &type, const closure_bool &view) const;
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bool for_each(const string_view &type, const event::closure_idx_bool &view) const;
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void for_each(const string_view &type, const event::closure_idx &) const;
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bool for_each(const string_view &type, const event::id::closure_bool &view) const;
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void for_each(const string_view &type, const event::id::closure &) const;
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bool for_each(const string_view &type, const event::closure_bool &view) const;
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void for_each(const string_view &type, const event::closure &) const;
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bool for_each(const closure_bool &view) const;
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bool for_each(const event::closure_idx_bool &view) const;
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void for_each(const event::closure_idx &) const;
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bool for_each(const event::id::closure_bool &view) const;
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void for_each(const event::id::closure &) const;
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bool for_each(const event::closure_bool &view) const;
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void for_each(const event::closure &) const;
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// Counting / Statistics
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size_t count(const string_view &type) const;
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size_t count() const;
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// Existential
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bool has(const string_view &type, const string_view &state_key) const;
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bool has(const string_view &type) const;
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// Fetch a state event
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bool get(std::nothrow_t, const string_view &type, const string_view &state_key, const event::closure_idx &) const;
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bool get(std::nothrow_t, const string_view &type, const string_view &state_key, const event::id::closure &) const;
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bool get(std::nothrow_t, const string_view &type, const string_view &state_key, const event::closure &) const;
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void get(const string_view &type, const string_view &state_key, const event::closure_idx &) const;
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void get(const string_view &type, const string_view &state_key, const event::id::closure &) const;
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void get(const string_view &type, const string_view &state_key, const event::closure &) const;
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event::idx get(std::nothrow_t, const string_view &type, const string_view &state_key = "") const;
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event::idx get(const string_view &type, const string_view &state_key = "") const;
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// Initiate a database prefetch on the state to cache for future access.
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size_t prefetch(const string_view &type, const event::idx &start = 0, const event::idx &stop = 0) const;
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size_t prefetch(const event::idx &start = 0, const event::idx &stop = 0) const;
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state(const m::room &room, const event::fetch::opts *const & = nullptr);
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state() = default;
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state(const state &) = delete;
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state &operator=(const state &) = delete;
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static bool prev(const event::idx &, const event::closure_idx_bool &);
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static bool next(const event::idx &, const event::closure_idx_bool &);
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static event::idx prev(const event::idx &);
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static event::idx next(const event::idx &);
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static size_t prefetch(const state &, const string_view &, const event::idx_range &);
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static size_t clear_history(const state &);
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static size_t rebuild_history(const state &);
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static size_t rebuild_present(const state &);
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static bool force_present(const event &);
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};
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