content/child/resource_scheduling_filter.cc

// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/child/resource_scheduling_filter.h"

#include <utility>

#include "base/bind.h"
#include "base/location.h"
#include "content/child/resource_dispatcher.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_message_start.h"

namespace content {

ResourceSchedulingFilter::ResourceSchedulingFilter(
    const scoped_refptr<base::SingleThreadTaskRunner>& main_thread_task_runner,
    ResourceDispatcher* resource_dispatcher)
    : main_thread_task_runner_(main_thread_task_runner),
      resource_dispatcher_(resource_dispatcher->GetWeakPtr()),
      weak_ptr_factory_(this) {
  DCHECK(main_thread_task_runner_.get());
}

ResourceSchedulingFilter::~ResourceSchedulingFilter() {
}

bool ResourceSchedulingFilter::OnMessageReceived(const IPC::Message& message) {
  base::AutoLock lock(request_id_to_task_runner_map_lock_);
  int request_id;

  base::PickleIterator pickle_iterator(message);
  if (!pickle_iterator.ReadInt(&request_id)) {
    NOTREACHED() << "malformed resource message";
    return true;
  }
  // Dispatch the message on the request id specific task runner, if there is
  // one, or on the general main_thread_task_runner if there isn't.
  RequestIdToTaskRunnerMap::const_iterator iter =
      request_id_to_task_runner_map_.find(request_id);
  scoped_refptr<base::SingleThreadTaskRunner> task_runner;
  if (iter != request_id_to_task_runner_map_.end()) {
    task_runner = iter->second;
  } else {
    task_runner = main_thread_task_runner_;
  }
  task_runner->PostTask(FROM_HERE,
                        base::Bind(&ResourceSchedulingFilter::DispatchMessage,
                                   weak_ptr_factory_.GetWeakPtr(), message));
  return true;
}

void ResourceSchedulingFilter::SetRequestIdTaskRunner(
    int id,
    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
  base::AutoLock lock(request_id_to_task_runner_map_lock_);
  request_id_to_task_runner_map_.insert(std::make_pair(id, task_runner));
}

void ResourceSchedulingFilter::ClearRequestIdTaskRunner(int id) {
  base::AutoLock lock(request_id_to_task_runner_map_lock_);
  request_id_to_task_runner_map_.erase(id);
}

bool ResourceSchedulingFilter::GetSupportedMessageClasses(
    std::vector<uint32_t>* supported_message_classes) const {
  supported_message_classes->push_back(ResourceMsgStart);
  return true;
}

void ResourceSchedulingFilter::DispatchMessage(const IPC::Message& message) {
  if (resource_dispatcher_)
    resource_dispatcher_->OnMessageReceived(message);
}

}  // namespace content