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// top.h : DB usage monitor.
/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <boost/date_time/posix_time/posix_time.hpp>
#include "mongo/db/commands.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/stats/operation_latency_histogram.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/net/message.h"
#include "mongo/util/string_map.h"
namespace mongo {
class ServiceContext;
/**
* tracks usage by collection
*/
class Top {
public:
static Top& get(ServiceContext* service);
Top() = default;
struct UsageData {
UsageData() : time(0), count(0) {}
UsageData(const UsageData& older, const UsageData& newer);
long long time;
long long count;
void inc(long long micros) {
count++;
time += micros;
}
};
struct CollectionData {
/**
* constructs a diff
*/
CollectionData() {}
CollectionData(const CollectionData& older, const CollectionData& newer);
UsageData total;
UsageData readLock;
UsageData writeLock;
UsageData queries;
UsageData getmore;
UsageData insert;
UsageData update;
UsageData remove;
UsageData commands;
OperationLatencyHistogram opLatencyHistogram;
};
enum class LockType {
ReadLocked,
WriteLocked,
NotLocked,
};
typedef StringMap<CollectionData> UsageMap;
public:
void record(OperationContext* opCtx,
StringData ns,
LogicalOp logicalOp,
LockType lockType,
long long micros,
bool command,
Command::ReadWriteType readWriteType);
void append(BSONObjBuilder& b);
void cloneMap(UsageMap& out) const;
void collectionDropped(StringData ns, bool databaseDropped = false);
/**
* Appends the collection-level latency statistics
*/
void appendLatencyStats(StringData ns, bool includeHistograms, BSONObjBuilder* builder);
/**
* Increments the global histogram.
*/
void incrementGlobalLatencyStats(OperationContext* opCtx,
uint64_t latency,
Command::ReadWriteType readWriteType);
/**
* Appends the global latency statistics.
*/
void appendGlobalLatencyStats(bool includeHistograms, BSONObjBuilder* builder);
private:
void _appendToUsageMap(BSONObjBuilder& b, const UsageMap& map) const;
void _appendStatsEntry(BSONObjBuilder& b, const char* statsName, const UsageData& map) const;
void _record(OperationContext* opCtx,
CollectionData& c,
LogicalOp logicalOp,
LockType lockType,
long long micros,
Command::ReadWriteType readWriteType);
void _incrementHistogram(OperationContext* opCtx,
long long latency,
OperationLatencyHistogram* histogram,
Command::ReadWriteType readWriteType);
mutable SimpleMutex _lock;
OperationLatencyHistogram _globalHistogramStats;
UsageMap _usage;
std::string _lastDropped;
};
} // namespace mongo
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