| // Copyright 2013 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. |
| |
| #ifndef CONTENT_CHILD_CHILD_RESOURCE_MESSAGE_FILTER_H_ |
| #define CONTENT_CHILD_CHILD_RESOURCE_MESSAGE_FILTER_H_ |
| |
| #include "base/memory/ref_counted.h" |
| #include "ipc/ipc_channel_proxy.h" |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace content { |
| class ResourceDispatcher; |
| |
| // Supplies ResourceDispatcher with timestamps for some resource messages. |
| // |
| // Background: ResourceDispatcher converts browser process time to child |
| // process time. This is done to achieve coherent timeline. Conversion is |
| // a linear transformation such that given browser process time range is |
| // mapped to corresponding child process time range. Timestamps for child |
| // process time range should be taken by IO thread when resource messages |
| // arrive. Otherwise, timestamps may be affected by long rendering / JS task. |
| // |
| // When specific message is processed by this filter, new task charged |
| // with timestamp is posted to main thread. This task is processed just before |
| // resource message and invokes ResourceDispatcher::set_io_timestamp. |
| class ChildResourceMessageFilter : public IPC::ChannelProxy::MessageFilter { |
| public: |
| explicit ChildResourceMessageFilter(ResourceDispatcher* resource_dispatcher); |
| |
| // IPC::ChannelProxy::MessageFilter implementation. |
| virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; |
| |
| private: |
| virtual ~ChildResourceMessageFilter(); |
| |
| scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_; |
| ResourceDispatcher* resource_dispatcher_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ChildResourceMessageFilter); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_CHILD_CHILD_RESOURCE_MESSAGE_FILTER_H_ |