src/content/child/child_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/child/child_histogram_message_filter.h"
   6
   7 #include <ctype.h>
   8
   9 #include "base/bind.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/metrics/histogram_delta_serialization.h"
  12 #include "content/child/child_process.h"
  13 #include "content/child/child_thread.h"
  14 #include "content/common/child_process_messages.h"
  15
  16 namespace content {
  17
  18 ChildHistogramMessageFilter::ChildHistogramMessageFilter()
  19     : channel_(NULL),
  20       io_message_loop_(ChildProcess::current()->io_message_loop_proxy()) {
  21 }
  22
  23 ChildHistogramMessageFilter::~ChildHistogramMessageFilter() {
  24 }
  25
  26 void ChildHistogramMessageFilter::OnFilterAdded(IPC::Channel* channel) {
  27   channel_ = channel;
  28 }
  29
  30 void ChildHistogramMessageFilter::OnFilterRemoved() {
  31 }
  32
  33 bool ChildHistogramMessageFilter::OnMessageReceived(
  34     const IPC::Message& message) {
  35   bool handled = true;
  36   IPC_BEGIN_MESSAGE_MAP(ChildHistogramMessageFilter, message)
  37     IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildHistogramData,
  38                         OnGetChildHistogramData)
  39     IPC_MESSAGE_UNHANDLED(handled = false)
  40   IPC_END_MESSAGE_MAP()
  41   return handled;
  42 }
  43
  44 void ChildHistogramMessageFilter::SendHistograms(int sequence_number) {
  45   io_message_loop_->PostTask(
  46       FROM_HERE, base::Bind(&ChildHistogramMessageFilter::UploadAllHistograms,
  47                             this, sequence_number));
  48 }
  49
  50 void ChildHistogramMessageFilter::OnGetChildHistogramData(int sequence_number) {
  51   UploadAllHistograms(sequence_number);
  52 }
  53
  54 void ChildHistogramMessageFilter::UploadAllHistograms(int sequence_number) {
  55   if (!histogram_delta_serialization_) {
  56     histogram_delta_serialization_.reset(
  57         new base::HistogramDeltaSerialization("ChildProcess"));
  58   }
  59
  60   std::vector<std::string> deltas;
  61   histogram_delta_serialization_->PrepareAndSerializeDeltas(&deltas);
  62   channel_->Send(
  63       new ChildProcessHostMsg_ChildHistogramData(sequence_number, deltas));
  64
  65   static int count = 0;
  66   count++;
  67   DHISTOGRAM_COUNTS("Histogram.ChildProcessHistogramSentCount", count);
  68 }
  69
  70 }  // namespace content