mirror of https://gitee.com/bigwinds/arangodb
345 lines
14 KiB
C++
345 lines
14 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, query cache
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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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, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_AQL_QUERY_CACHE_H
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#define ARANGODB_AQL_QUERY_CACHE_H 1
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#include "Basics/Common.h"
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#include "Basics/JsonHelper.h"
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#include "Basics/ReadWriteLock.h"
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struct TRI_json_t;
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struct TRI_vocbase_s;
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namespace triagens {
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namespace aql {
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// -----------------------------------------------------------------------------
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// --SECTION-- public types
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief cache mode
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////////////////////////////////////////////////////////////////////////////////
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enum QueryCacheMode {
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CACHE_ALWAYS_OFF,
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CACHE_ALWAYS_ON,
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CACHE_ON_DEMAND
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- struct QueryCacheResultEntry
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// -----------------------------------------------------------------------------
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struct QueryCacheResultEntry {
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QueryCacheResultEntry () = delete;
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QueryCacheResultEntry (char const*,
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size_t,
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struct TRI_json_t*,
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std::vector<std::string> const&);
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~QueryCacheResultEntry ();
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char* _queryString;
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size_t _queryStringLength;
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struct TRI_json_t* _queryResult;
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std::vector<std::string> _collections;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- struct QueryCacheDatabaseEntry
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// -----------------------------------------------------------------------------
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struct QueryCacheDatabaseEntry {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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QueryCacheDatabaseEntry () = delete;
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QueryCacheDatabaseEntry (QueryCacheDatabaseEntry const&) = delete;
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QueryCacheDatabaseEntry& operator= (QueryCacheDatabaseEntry const&) = delete;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a database-specific cache
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////////////////////////////////////////////////////////////////////////////////
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explicit QueryCacheDatabaseEntry (struct TRI_vocbase_s*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy a database-specific cache
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////////////////////////////////////////////////////////////////////////////////
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~QueryCacheDatabaseEntry ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief lookup a query result in the database-specific cache
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////////////////////////////////////////////////////////////////////////////////
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std::shared_ptr<QueryCacheResultEntry> lookup (uint64_t,
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char const*,
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size_t) const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief store a query result in the database-specific cache
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////////////////////////////////////////////////////////////////////////////////
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void store (uint64_t,
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std::shared_ptr<QueryCacheResultEntry>&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all entries for the given collections in the
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/// database-specific cache
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (std::vector<char const*> const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all entries for a collection in the database-specific
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/// cache
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (char const*);
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// -----------------------------------------------------------------------------
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// --SECTION-- public variables
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// -----------------------------------------------------------------------------
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struct TRI_vocbase_s* _vocbase;
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std::unordered_map<uint64_t, std::shared_ptr<QueryCacheResultEntry>> _entriesByHash;
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std::unordered_map<std::string, std::unordered_set<uint64_t>> _entriesByCollection;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- class QueryCache
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// -----------------------------------------------------------------------------
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class QueryCache {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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QueryCache (QueryCache const&) = delete;
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QueryCache& operator= (QueryCache const&) = delete;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create cache
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////////////////////////////////////////////////////////////////////////////////
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QueryCache ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the cache
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////////////////////////////////////////////////////////////////////////////////
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~QueryCache ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the query cache properties
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::Json properties () const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief test whether the cache might be active
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/// this is a quick test that may save the caller from further bothering
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/// about the query cache if case it returns `false`
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////////////////////////////////////////////////////////////////////////////////
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bool mayBeActive () const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return whether or not the query cache is enabled
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////////////////////////////////////////////////////////////////////////////////
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QueryCacheMode mode () const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief enable or disable the query cache
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////////////////////////////////////////////////////////////////////////////////
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void mode (QueryCacheMode);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief enable or disable the query cache
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////////////////////////////////////////////////////////////////////////////////
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void mode (std::string const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a string version of the mode
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////////////////////////////////////////////////////////////////////////////////
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static std::string modeString (QueryCacheMode);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief lookup a query result in the cache
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////////////////////////////////////////////////////////////////////////////////
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std::shared_ptr<QueryCacheResultEntry> lookup (struct TRI_vocbase_s*,
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uint64_t,
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char const*,
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size_t);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief store a query in the cache
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/// if the call is successful, the cache has taken over ownership for the
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/// query result!
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////////////////////////////////////////////////////////////////////////////////
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void store (struct TRI_vocbase_s*,
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uint64_t,
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char const*,
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size_t,
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struct TRI_json_t*,
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std::vector<std::string> const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for the given collections
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/// the lock is already acquired externally so we don't lock again
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (triagens::basics::ReadWriteLock&,
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struct TRI_vocbase_s*,
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std::vector<char const*> const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for the given collections
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (struct TRI_vocbase_s*,
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std::vector<char const*> const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for a particular collection
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/// the lock is already acquired externally so we don't lock again
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (triagens::basics::ReadWriteLock&,
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struct TRI_vocbase_s*,
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char const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for a particular collection
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (struct TRI_vocbase_s*,
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char const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for a particular database
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/// the lock is already acquired externally so we don't lock again
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (triagens::basics::ReadWriteLock&,
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struct TRI_vocbase_s*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all queries for a particular database
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////////////////////////////////////////////////////////////////////////////////
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void invalidate (struct TRI_vocbase_s*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns a reference to the R/w lock so callers can externally lock it
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::ReadWriteLock& getLock () {
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return _lock;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the pointer to the global query cache
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////////////////////////////////////////////////////////////////////////////////
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static QueryCache* instance ();
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief invalidate all entries in cache
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/// note that the caller of this method must hold the write lock
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////////////////////////////////////////////////////////////////////////////////
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void invalidate ();
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief read-write lock for the cache
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::ReadWriteLock _lock;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief cached queries
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_map<struct TRI_vocbase_s*, QueryCacheDatabaseEntry*> _entries;
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};
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}
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}
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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