src/net/disk_cache/simple/simple_histogram_macros.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_HISTOGRAM_MACROS_H_
   6 #define NET_DISK_CACHE_SIMPLE_SIMPLE_HISTOGRAM_MACROS_H_
   7
   8 #include "base/metrics/histogram.h"
   9 #include "base/metrics/sparse_histogram.h"
  10 #include "net/base/cache_type.h"
  11
  12 // This file contains macros used to report histograms. The main issue is that
  13 // we want to have separate histograms for each type of cache (http vs app),
  14 // while making it easy to report histograms and have all names precomputed.
  15
  16 #define SIMPLE_CACHE_THUNK(uma_type, args) UMA_HISTOGRAM_##uma_type args
  17
  18 #define SIMPLE_CACHE_UMA(uma_type, uma_name, cache_type, ...)         \
  19   do {                                                                \
  20     switch (cache_type) {                                             \
  21       case net::DISK_CACHE:                                           \
  22         SIMPLE_CACHE_THUNK(                                           \
  23             uma_type, ("SimpleCache.Http." uma_name, ##__VA_ARGS__)); \
  24         break;                                                        \
  25       case net::APP_CACHE:                                            \
  26         SIMPLE_CACHE_THUNK(                                           \
  27             uma_type, ("SimpleCache.App." uma_name, ##__VA_ARGS__));  \
  28         break;                                                        \
  29       default:                                                        \
  30         NOTREACHED();                                                 \
  31         break;                                                        \
  32     }                                                                 \
  33   } while (0)
  34
  35 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_HISTOGRAM_MACROS_H_