content/browser/histogram_message_filter.cc

   1 // Copyright (c) 2012 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 #include "content/browser/histogram_message_filter.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/metrics/statistics_recorder.h"
  10 #include "base/process_util.h"
  11 #include "content/browser/histogram_controller.h"
  12 #include "content/browser/tcmalloc_internals_request_job.h"
  13 #include "content/common/child_process_messages.h"
  14 #include "content/public/common/content_switches.h"
  15
  16 namespace content {
  17
  18 HistogramMessageFilter::HistogramMessageFilter() {}
  19
  20 void HistogramMessageFilter::OnChannelConnected(int32 peer_pid) {
  21   BrowserMessageFilter::OnChannelConnected(peer_pid);
  22 }
  23
  24 bool HistogramMessageFilter::OnMessageReceived(const IPC::Message& message,
  25                                               bool* message_was_ok) {
  26   bool handled = true;
  27   IPC_BEGIN_MESSAGE_MAP_EX(HistogramMessageFilter, message, *message_was_ok)
  28     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ChildHistogramData,
  29                         OnChildHistogramData)
  30     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_GetBrowserHistogram,
  31                         OnGetBrowserHistogram)
  32     IPC_MESSAGE_UNHANDLED(handled = false)
  33   IPC_END_MESSAGE_MAP_EX()
  34   return handled;
  35 }
  36
  37 HistogramMessageFilter::~HistogramMessageFilter() {}
  38
  39 void HistogramMessageFilter::OnChildHistogramData(
  40     int sequence_number,
  41     const std::vector<std::string>& pickled_histograms) {
  42   HistogramController::GetInstance()->OnHistogramDataCollected(
  43       sequence_number, pickled_histograms);
  44 }
  45
  46 void HistogramMessageFilter::OnGetBrowserHistogram(
  47     const std::string& name,
  48     std::string* histogram_json) {
  49   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
  50   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kMemoryMetrics))
  51     return;
  52   if (name != "Memory.BrowserUsed")
  53     return;
  54   base::Histogram* histogram = base::StatisticsRecorder::FindHistogram(name);
  55   if (!histogram) {
  56     *histogram_json = "{}";
  57   } else {
  58     histogram->WriteJSON(histogram_json);
  59   }
  60 }
  61
  62 }  // namespace content