mirror of https://gitee.com/bigwinds/arangodb
348 lines
14 KiB
C++
348 lines
14 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, list of queries running in database
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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_LIST_H
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#define ARANGODB_AQL_QUERY_LIST_H 1
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#include "Basics/Common.h"
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#include "Basics/ReadWriteLock.h"
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#include "VocBase/voc-types.h"
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struct TRI_vocbase_t;
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namespace triagens {
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namespace aql {
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class Query;
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// -----------------------------------------------------------------------------
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// --SECTION-- struct QueryEntry
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// -----------------------------------------------------------------------------
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struct QueryEntry {
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QueryEntry (triagens::aql::Query const*,
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double);
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triagens::aql::Query const* query;
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double const started;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- struct QueryEntryCopy
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// -----------------------------------------------------------------------------
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struct QueryEntryCopy {
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QueryEntryCopy (TRI_voc_tick_t,
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std::string const&,
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double,
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double);
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TRI_voc_tick_t id;
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std::string queryString;
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double started;
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double runTime;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- class QueryList
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// -----------------------------------------------------------------------------
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class QueryList {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a query list
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////////////////////////////////////////////////////////////////////////////////
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explicit QueryList (TRI_vocbase_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy a query list
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////////////////////////////////////////////////////////////////////////////////
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~QueryList ();
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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 whether or not queries are tracked
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline bool enabled () const {
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return _enabled;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief toggle query tracking
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline void enabled (bool value) {
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_enabled = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not slow queries are tracked
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline bool trackSlowQueries () const {
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return _trackSlowQueries;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief toggle slow query tracking
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline void trackSlowQueries (bool value) {
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_trackSlowQueries = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief threshold for slow queries (in seconds)
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline double slowQueryThreshold () const {
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return _slowQueryThreshold;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the slow query threshold
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline void slowQueryThreshold (double value) {
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if (value < 0.0 || value == HUGE_VAL || value != value) {
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// sanity checks
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value = 0.0;
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}
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_slowQueryThreshold = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the max number of slow queries to keep
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline size_t maxSlowQueries () const {
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return _maxSlowQueries;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the max number of slow queries to keep
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline void maxSlowQueries (size_t value) {
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if (value > 16384) {
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// sanity checks
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value = 16384;
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}
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_maxSlowQueries = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the max length of query strings that are stored / returned
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline size_t maxQueryStringLength () const {
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return _maxQueryStringLength;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the max length of query strings that are stored / returned
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/// we're not using a lock here for performance reasons - thus concurrent
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/// modifications of this variable are possible but are considered unharmful
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////////////////////////////////////////////////////////////////////////////////
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inline void maxQueryStringLength (size_t value) {
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// sanity checks
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if (value < 64) {
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value = 64;
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}
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else if (value >= 8 * 1024 * 1024) {
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value = 8 * 1024 * 1024;
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}
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_maxQueryStringLength = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief enter a query
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////////////////////////////////////////////////////////////////////////////////
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bool insert (Query const*,
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double);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief remove a query
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////////////////////////////////////////////////////////////////////////////////
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void remove (Query const*,
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double);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief kills a query
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////////////////////////////////////////////////////////////////////////////////
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int kill (TRI_voc_tick_t);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the list of running queries
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////////////////////////////////////////////////////////////////////////////////
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std::vector<QueryEntryCopy> listCurrent ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the list of slow queries
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////////////////////////////////////////////////////////////////////////////////
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std::vector<QueryEntryCopy> listSlow ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief clear the list of slow queries
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////////////////////////////////////////////////////////////////////////////////
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void clearSlow ();
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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 r/w lock for the list
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::ReadWriteLock _lock;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief list of current queries
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_map<TRI_voc_tick_t, QueryEntry*> _current;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief list of slow queries
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////////////////////////////////////////////////////////////////////////////////
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std::list<QueryEntryCopy> _slow;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current number of slow queries
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////////////////////////////////////////////////////////////////////////////////
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size_t _slowCount;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not queries are tracked
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////////////////////////////////////////////////////////////////////////////////
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bool _enabled;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not slow queries are tracked
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////////////////////////////////////////////////////////////////////////////////
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bool _trackSlowQueries;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief threshold for slow queries (in seconds)
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////////////////////////////////////////////////////////////////////////////////
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double _slowQueryThreshold;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief maximum number of slow queries to keep
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////////////////////////////////////////////////////////////////////////////////
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size_t _maxSlowQueries;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief max length of query strings to return
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////////////////////////////////////////////////////////////////////////////////
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size_t _maxQueryStringLength;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief default threshold for slow queries
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////////////////////////////////////////////////////////////////////////////////
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static double const DefaultSlowQueryThreshold;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief default maximum number of slow queries to keep in list
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////////////////////////////////////////////////////////////////////////////////
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static size_t const DefaultMaxSlowQueries;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief default max length of a query when returning it
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////////////////////////////////////////////////////////////////////////////////
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static size_t const DefaultMaxQueryStringLength;
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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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