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// snapshots.h
/**
* Copyright (C) 2008 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 "mongo/base/status_with.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/stats/top.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/background.h"
/**
handles snapshotting performance metrics and other such things
*/
namespace mongo {
class StatsSnapshotThread;
/**
* stores a point in time snapshot
* i.e. all counters at a given time
*/
class SnapshotData {
void takeSnapshot();
unsigned long long _created;
Top::UsageMap _usage;
friend class StatsSnapshotThread;
friend class SnapshotDelta;
friend class Snapshots;
};
/**
* contains performance information for a time period
*/
class SnapshotDelta {
public:
SnapshotDelta(const SnapshotData& older, const SnapshotData& newer);
unsigned long long elapsed() const {
return _elapsed;
}
Top::UsageMap collectionUsageDiff();
private:
const SnapshotData& _older;
const SnapshotData& _newer;
unsigned long long _elapsed;
};
struct SnapshotDiff {
Top::UsageMap usageDiff;
unsigned long long timeElapsed;
SnapshotDiff() = default;
SnapshotDiff(Top::UsageMap map, unsigned long long elapsed)
: usageDiff(std::move(map)), timeElapsed(elapsed) {}
};
class Snapshots {
public:
Snapshots();
const SnapshotData* takeSnapshot();
StatusWith<SnapshotDiff> computeDelta();
private:
stdx::mutex _lock;
static const int kNumSnapshots = 2;
SnapshotData _snapshots[kNumSnapshots];
int _loc;
int _stored;
};
class StatsSnapshotThread : public BackgroundJob {
public:
virtual std::string name() const {
return "statsSnapshot";
}
void run();
};
extern Snapshots statsSnapshots;
extern StatsSnapshotThread statsSnapshotThread;
}
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