content/child/child_message_filter.cc

   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 #include "content/child/child_message_filter.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/location.h"
  10 #include "base/task_runner.h"
  11 #include "content/child/child_thread.h"
  12 #include "content/child/thread_safe_sender.h"
  13 #include "ipc/message_filter.h"
  14
  15 namespace content {
  16
  17 class ChildMessageFilter::Internal : public IPC::MessageFilter {
  18  public:
  19   explicit Internal(ChildMessageFilter* filter) : filter_(filter) {}
  20
  21   bool OnMessageReceived(const IPC::Message& msg) override {
  22     scoped_refptr<base::TaskRunner> runner =
  23         filter_->OverrideTaskRunnerForMessage(msg);
  24     if (runner.get() && !runner->RunsTasksOnCurrentThread()) {
  25       if (!runner->PostTask(
  26               FROM_HERE,
  27               base::Bind(
  28                   base::IgnoreResult(&ChildMessageFilter::OnMessageReceived),
  29                   filter_, msg)))
  30         filter_->OnStaleMessageReceived(msg);
  31       return true;
  32     }
  33
  34     return filter_->OnMessageReceived(msg);
  35   }
  36
  37  private:
  38   ~Internal() override {}
  39   scoped_refptr<ChildMessageFilter> filter_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(Internal);
  42 };
  43
  44 bool ChildMessageFilter::Send(IPC::Message* message) {
  45   return thread_safe_sender_->Send(message);
  46 }
  47
  48 base::TaskRunner* ChildMessageFilter::OverrideTaskRunnerForMessage(
  49     const IPC::Message& msg) {
  50   return NULL;
  51 }
  52
  53 ChildMessageFilter::ChildMessageFilter()
  54     : internal_(NULL),
  55       thread_safe_sender_(ChildThread::current()->thread_safe_sender()) {}
  56
  57 ChildMessageFilter::~ChildMessageFilter() {}
  58
  59 IPC::MessageFilter* ChildMessageFilter::GetFilter() {
  60   if (!internal_)
  61     internal_ = new Internal(this);
  62   return internal_;
  63 }
  64
  65 }  // namespace content