Reorganize net/disk_cache into backend specific directories.

net/disk_cache/histogram_macros.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file contains macros to simplify histogram reporting from the disk
-// cache. The main issue is that we want to have separate histograms for each
-// type of cache (regular vs. media, etc), without adding the complexity of
-// keeping track of a potentially large number of histogram objects that have to
-// survive the backend object that created them.
-
-#ifndef NET_DISK_CACHE_HISTOGRAM_MACROS_H_
-#define NET_DISK_CACHE_HISTOGRAM_MACROS_H_
-
-// -----------------------------------------------------------------------------
-
-// These histograms follow the definition of UMA_HISTOGRAMN_XXX except that
-// whenever the name changes (the experiment group changes), the histrogram
-// object is re-created.
-// Note: These macros are only run on one thread, so the declarations of
-// |counter| was made static (i.e., there will be no race for reinitialization).
-
-#define CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
-    do { \
-      static base::HistogramBase* counter(NULL); \
-      if (!counter || name != counter->histogram_name()) \
-        counter = base::Histogram::FactoryGet( \
-            name, min, max, bucket_count, \
-            base::Histogram::kUmaTargetedHistogramFlag); \
-      counter->Add(sample); \
-    } while (0)
-
-#define CACHE_HISTOGRAM_COUNTS(name, sample) CACHE_HISTOGRAM_CUSTOM_COUNTS( \
-    name, sample, 1, 1000000, 50)
-
-#define CACHE_HISTOGRAM_COUNTS_10000(name, sample) \
-    CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, 1, 10000, 50)
-
-#define CACHE_HISTOGRAM_COUNTS_50000(name, sample) \
-    CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, 1, 50000000, 50)
-
-#define CACHE_HISTOGRAM_CUSTOM_TIMES(name, sample, min, max, bucket_count) \
-    do { \
-      static base::HistogramBase* counter(NULL); \
-      if (!counter || name != counter->histogram_name()) \
-        counter = base::Histogram::FactoryTimeGet( \
-            name, min, max, bucket_count, \
-            base::Histogram::kUmaTargetedHistogramFlag); \
-      counter->AddTime(sample); \
-    } while (0)
-
-#define CACHE_HISTOGRAM_TIMES(name, sample) CACHE_HISTOGRAM_CUSTOM_TIMES( \
-    name, sample, base::TimeDelta::FromMilliseconds(1), \
-    base::TimeDelta::FromSeconds(10), 50)
-
-#define CACHE_HISTOGRAM_ENUMERATION(name, sample, boundary_value) do { \
-    static base::HistogramBase* counter(NULL); \
-    if (!counter || name != counter->histogram_name()) \
-      counter = base::LinearHistogram::FactoryGet( \
-                    name, 1, boundary_value, boundary_value + 1, \
-                    base::Histogram::kUmaTargetedHistogramFlag); \
-    counter->Add(sample); \
-  } while (0)
-
-#define CACHE_HISTOGRAM_PERCENTAGE(name, under_one_hundred) \
-    CACHE_HISTOGRAM_ENUMERATION(name, under_one_hundred, 101)
-
-// -----------------------------------------------------------------------------
-
-// HISTOGRAM_HOURS will collect time related data with a granularity of hours
-// and normal values of a few months.
-#define CACHE_HISTOGRAM_HOURS CACHE_HISTOGRAM_COUNTS_10000
-
-// HISTOGRAM_AGE will collect time elapsed since |initial_time|, with a
-// granularity of hours and normal values of a few months.
-#define CACHE_HISTOGRAM_AGE(name, initial_time) \
-    CACHE_HISTOGRAM_COUNTS_10000(name, \
-                                 (base::Time::Now() - initial_time).InHours())
-
-// HISTOGRAM_AGE_MS will collect time elapsed since |initial_time|, with the
-// normal resolution of the UMA_HISTOGRAM_TIMES.
-#define CACHE_HISTOGRAM_AGE_MS(name, initial_time)\
-    CACHE_HISTOGRAM_TIMES(name, base::TimeTicks::Now() - initial_time)
-
-#define CACHE_HISTOGRAM_CACHE_ERROR(name, sample) \
-    CACHE_HISTOGRAM_ENUMERATION(name, sample, 50)
-
-#define BACKEND_OBJ CACHE_HISTOGRAM_MACROS_BACKEND_IMPL_OBJ
-
-// Generates a UMA histogram of the given type, generating the proper name for
-// it (asking backend_->HistogramName), and adding the provided sample.
-// For example, to generate a regualar UMA_HISTOGRAM_COUNTS, this macro would
-// be used as:
-//  CACHE_UMA(COUNTS, "MyName", 0, 20);
-//  CACHE_UMA(COUNTS, "MyExperiment", 530, 55);
-// which roughly translates to:
-//  UMA_HISTOGRAM_COUNTS("DiskCache.2.MyName", 20);  // "2" is the CacheType.
-//  UMA_HISTOGRAM_COUNTS("DiskCache.2.MyExperiment_530", 55);
-//
-#define CACHE_UMA(type, name, experiment, sample) {\
-    const std::string my_name = BACKEND_OBJ->HistogramName(name, experiment);\
-    switch (BACKEND_OBJ->cache_type()) {\
-      case net::DISK_CACHE:\
-        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
-        break;\
-      case net::MEDIA_CACHE:\
-        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
-        break;\
-      case net::APP_CACHE:\
-        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
-        break;\
-      case net::SHADER_CACHE:\
-        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
-        break;\
-      case net::PNACL_CACHE:\
-        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
-        break;\
-      default:\
-        NOTREACHED();\
-        break;\
-    }\
-  }
-
-#endif  // NET_DISK_CACHE_HISTOGRAM_MACROS_H_