mirror of
https://github.com/matrix-construct/construct
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68 lines
2.7 KiB
C++
68 lines
2.7 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_DB_CACHE_H
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// Interface to a cache. This interface is included in the standard include
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// stack by forward declaring the rocksdb::Cache symbol.
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//
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// The interface overloads on a pointer to a cache for developer convenience.
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// This is because caches may not always exist for some entity, and accessors
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// will return a null pointer. The pointer overloads here will safely accept
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// null pointers and provide the appropriate no-op behavior.
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namespace ircd::db
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{
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// Get capacity
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size_t capacity(const rocksdb::Cache &);
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size_t capacity(const rocksdb::Cache *const &);
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// Set capacity
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void capacity(rocksdb::Cache &, const size_t &);
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bool capacity(rocksdb::Cache *const &, const size_t &);
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// Get usage
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size_t usage(const rocksdb::Cache &);
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size_t usage(const rocksdb::Cache *const &);
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// Test if key exists
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bool exists(const rocksdb::Cache &, const string_view &key);
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bool exists(const rocksdb::Cache *const &, const string_view &key);
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// Iterate the cache entries.
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using cache_closure = std::function<void (const const_buffer &)>;
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void for_each(const rocksdb::Cache &, const cache_closure &);
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void for_each(const rocksdb::Cache *const &, const cache_closure &);
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// Manually cache a key/value directly
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bool insert(rocksdb::Cache &, const string_view &key, unique_buffer<const_buffer>);
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bool insert(rocksdb::Cache *const &, const string_view &key, unique_buffer<const_buffer>);
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// Manually cache a copy of key/value
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bool insert(rocksdb::Cache &, const string_view &key, const string_view &value);
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bool insert(rocksdb::Cache *const &, const string_view &key, const string_view &value);
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// Remove key if it exists
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bool remove(rocksdb::Cache &, const string_view &key);
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bool remove(rocksdb::Cache *const &, const string_view &key);
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// Clear the cache (won't clear entries which are actively referenced)
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void clear(rocksdb::Cache &);
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void clear(rocksdb::Cache *const &);
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// Read the key from disk into cache; yields when done; returns exists.
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bool fetch(rocksdb::Cache &, column &, const string_view &key);
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bool fetch(rocksdb::Cache *const &, column &, const string_view &key);
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// Read the key from disk into cache asynchronously; returns immediately.
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void prefetch(rocksdb::Cache &, column &, const string_view &key);
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void prefetch(rocksdb::Cache *const &, column &, const string_view &key);
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}
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