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// Copyright 2015 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 BLIMP_NET_BLIMP_MESSAGE_CHECKPOINTER_H_
#define BLIMP_NET_BLIMP_MESSAGE_CHECKPOINTER_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/timer/timer.h"
#include "blimp/net/blimp_message_processor.h"
#include "blimp/net/blimp_net_export.h"
namespace blimp {
class BlimpMessage;
class BlimpMessageCheckpointObserver;
// Utility class configured with incoming & outgoing MessageProcessors,
// responsible for dispatching checkpoint/ACK messages to the outgoing
// processor, as the incoming processor completes processing them.
// Checkpoint/ACK message dispatch may be deferred for a second or
// two to avoid saturating the link with ACK traffic; feature implementations
// need to account for this latency in their design.
// BlimpMessageCheckpointer is created on the UI thread, and then used and
// destroyed on the IO thread.
class BLIMP_NET_EXPORT BlimpMessageCheckpointer : public BlimpMessageProcessor {
public:
BlimpMessageCheckpointer(BlimpMessageProcessor* incoming_processor,
BlimpMessageProcessor* outgoing_processor,
BlimpMessageCheckpointObserver* checkpoint_observer);
~BlimpMessageCheckpointer() override;
// BlimpMessageProcessor interface.
void ProcessMessage(scoped_ptr<BlimpMessage> message,
const net::CompletionCallback& callback) override;
private:
void InvokeCompletionCallback(const net::CompletionCallback& callback,
int result);
void SendCheckpointAck();
BlimpMessageProcessor* incoming_processor_;
BlimpMessageProcessor* outgoing_processor_;
BlimpMessageCheckpointObserver* checkpoint_observer_;
// Holds the Id of the message that most recently completed processing.
int64_t checkpoint_id_ = 0;
// Used to batch multiple processed messages into a single ACK.
base::OneShotTimer defer_timer_;
// Used to abandon pending ProcessMessage completion callbacks on deletion.
base::WeakPtrFactory<BlimpMessageCheckpointer> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(BlimpMessageCheckpointer);
};
} // namespace blimp
#endif // BLIMP_NET_BLIMP_MESSAGE_CHECKPOINTER_H_
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