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      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   static int count = 0;
     67   count++;
     68   DHISTOGRAM_COUNTS("Histogram.ChildProcessHistogramSentCount", count);
     69 }
     70 
     71 }  // namespace content
     72