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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_FRAME_TOKEN_MESSAGE_QUEUE_H_
#define CONTENT_BROWSER_RENDERER_HOST_FRAME_TOKEN_MESSAGE_QUEUE_H_
#include <map>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
namespace content {
// The Renderer sends various messages which are not to be processed until after
// their associated frame has been processed. These messages are provided with a
// FrameToken to be used for synchronizing.
//
// Viz processes the frames, after which it notifies the Browser of which
// FrameToken has completed processing.
//
// Non-IPC callbacks can be enqueued with EnqueueOrRunFrameTokenCallback.
//
// Upon receipt of DidProcessFrame all Messages associated with the provided
// FrameToken are then dispatched, and all enqueued callbacks are ran.
class CONTENT_EXPORT FrameTokenMessageQueue {
public:
// Notified of errors in processing messages.
class Client {
public:
~Client() {}
// Notified when an invalid frame token was received.
virtual void OnInvalidFrameToken(uint32_t frame_token) = 0;
};
FrameTokenMessageQueue();
FrameTokenMessageQueue(const FrameTokenMessageQueue&) = delete;
FrameTokenMessageQueue& operator=(const FrameTokenMessageQueue&) = delete;
virtual ~FrameTokenMessageQueue();
// Initializes this instance. This should always be the first method called
// to initialize state.
void Init(Client* client);
// Signals that a frame with token |frame_token| was finished processing. If
// there are any queued messages belonging to it, they will be processed.
void DidProcessFrame(uint32_t frame_token, base::TimeTicks activation_time);
// Enqueues |callback| to be called upon the arrival of |frame_token| in
// DidProcessFrame. However if |frame_token| has already arrived |callback| is
// ran immediately. The |callback| is provided the time for which the frame
// was activated.
void EnqueueOrRunFrameTokenCallback(
uint32_t frame_token,
base::OnceCallback<void(base::TimeTicks)> callback);
// Called when the renderer process is gone. This will reset our state to be
// consistent incase a new renderer is created.
void Reset();
size_t size() const { return callback_map_.size(); }
private:
// Not owned.
raw_ptr<Client, DanglingUntriaged> client_ = nullptr;
// Last non-zero frame token received from the renderer. Any swap messsages
// having a token less than or equal to this value will be processed.
uint32_t last_received_frame_token_ = 0;
base::TimeTicks last_received_activation_time_;
// Map of all callbacks for which their corresponding frame have not arrived.
// Sorted by frame token.
std::multimap<uint32_t, base::OnceCallback<void(base::TimeTicks)>>
callback_map_;
// The frame token last seen when Reset() is called. To determine if we are
// getting delayed frame acknowledgements after a reset.
uint32_t last_received_frame_token_reset_ = 0u;
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_FRAME_TOKEN_MESSAGE_QUEUE_H_
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