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// top.h : DB usage monitor.
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <boost/date_time/posix_time/posix_time.hpp>
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/string_map.h"
namespace mongo {
/**
* tracks usage by collection
*/
class Top {
public:
Top() : _lock("Top") { }
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;
};
typedef StringMap<CollectionData> UsageMap;
public:
void record( const StringData& ns , int op , int lockType , long long micros , bool command );
void append( BSONObjBuilder& b );
void cloneMap(UsageMap& out) const;
CollectionData getGlobalData() const { return _global; }
void collectionDropped( const StringData& ns );
public: // static stuff
static Top global;
private:
void _appendToUsageMap( BSONObjBuilder& b , const UsageMap& map ) const;
void _appendStatsEntry( BSONObjBuilder& b , const char * statsName , const UsageData& map ) const;
void _record( CollectionData& c , int op , int lockType , long long micros , bool command );
mutable SimpleMutex _lock;
CollectionData _global;
UsageMap _usage;
string _lastDropped;
};
} // namespace mongo
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