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 #include "ipc/ipc_sender.h"
  16
  17 namespace content {
  18
  19 ChildHistogramMessageFilter::ChildHistogramMessageFilter()
  20     : sender_(NULL),
  21       io_message_loop_(ChildProcess::current()->io_message_loop_proxy()) {
  22 }
  23
  24 ChildHistogramMessageFilter::~ChildHistogramMessageFilter() {
  25 }
  26
  27 void ChildHistogramMessageFilter::OnFilterAdded(IPC::Sender* sender) {
  28   sender_ = sender;
  29 }
  30
  31 void ChildHistogramMessageFilter::OnFilterRemoved() {
  32 }
  33
  34 bool ChildHistogramMessageFilter::OnMessageReceived(
  35     const IPC::Message& message) {
  36   bool handled = true;
  37   IPC_BEGIN_MESSAGE_MAP(ChildHistogramMessageFilter, message)
  38     IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildHistogramData,
  39                         OnGetChildHistogramData)
  40     IPC_MESSAGE_UNHANDLED(handled = false)
  41   IPC_END_MESSAGE_MAP()
  42   return handled;
  43 }
  44
  45 void ChildHistogramMessageFilter::SendHistograms(int sequence_number) {
  46   io_message_loop_->PostTask(
  47       FROM_HERE, base::Bind(&ChildHistogramMessageFilter::UploadAllHistograms,
  48                             this, sequence_number));
  49 }
  50
  51 void ChildHistogramMessageFilter::OnGetChildHistogramData(int sequence_number) {
  52   UploadAllHistograms(sequence_number);
  53 }
  54
  55 void ChildHistogramMessageFilter::UploadAllHistograms(int sequence_number) {
  56   if (!histogram_delta_serialization_) {
  57     histogram_delta_serialization_.reset(
  58         new base::HistogramDeltaSerialization("ChildProcess"));
  59   }
  60
  61   std::vector<std::string> deltas;
  62   histogram_delta_serialization_->PrepareAndSerializeDeltas(&deltas);
  63   sender_->Send(
  64       new ChildProcessHostMsg_ChildHistogramData(sequence_number, deltas));
  65
  66 #ifndef NDEBUG
  67   static int count = 0;
  68   count++;
  69   LOCAL_HISTOGRAM_COUNTS("Histogram.ChildProcessHistogramSentCount", count);
  70 #endif
  71 }
  72
  73 }  // namespace content