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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef NET_DISK_CACHE_STATS_H__
#define NET_DISK_CACHE_STATS_H__
#include <string>
#include <vector>
#include "base/basictypes.h"
namespace disk_cache {
class BackendImpl;
typedef std::vector<std::pair<std::string, std::string> > StatsItems;
// This class stores cache-specific usage information, for tunning purposes.
class Stats {
public:
static const int kDataSizesLength = 28;
enum Counters {
MIN_COUNTER = 0,
OPEN_MISS = MIN_COUNTER,
OPEN_HIT,
CREATE_MISS,
CREATE_HIT,
CREATE_ERROR,
TRIM_ENTRY,
DOOM_ENTRY,
DOOM_CACHE,
INVALID_ENTRY,
OPEN_ENTRIES, // Average number of open entries.
MAX_ENTRIES, // Maximum number of open entries.
TIMER,
READ_DATA,
WRITE_DATA,
OPEN_RANKINGS, // An entry has to be read just to modify rankings.
GET_RANKINGS, // We got the ranking info without reading the whole entry.
FATAL_ERROR,
MAX_COUNTER
};
Stats() : backend_(NULL) {}
~Stats();
bool Init(BackendImpl* backend, uint32* storage_addr);
// Tracks changes to the stoage space used by an entry.
void ModifyStorageStats(int32 old_size, int32 new_size);
// Tracks general events.
void OnEvent(Counters an_event);
void SetCounter(Counters counter, int64 value);
int64 GetCounter(Counters counter) const;
void GetItems(StatsItems* items);
private:
int GetStatsBucket(int32 size);
BackendImpl* backend_;
uint32 storage_addr_;
int data_sizes_[kDataSizesLength];
int64 counters_[MAX_COUNTER];
DISALLOW_EVIL_CONSTRUCTORS(Stats);
};
} // namespace disk_cache
#endif // NET_DISK_CACHE_STATS_H__
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