// Copyright (c) Facebook, Inc. and its affiliates.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#pragma once

#include "yarpl/Flowable.h"

#include "rsocket/Payload.h"

#include "rsocket/framing/FrameHeader.h"

#include "rsocket/internal/Common.h"

namespace rsocket {

// This class has to be implemented by the client application for cold

// resumption. The default implementation will error/close the streams.

class ColdResumeHandler {

public:

virtual ~ColdResumeHandler() = default;

// Generate an application-aware streamToken for the given stream parameters.

virtual std::string

generateStreamToken(const Payload&, StreamId streamId, StreamType) const;

// This method will be called for each REQUEST_STREAM for which the

// application acted as a responder. The default action would be to return a

// Flowable which errors out immediately.

// The second parameter is the allowance which the application received

// before cold-start and hasn't been fulfilled yet.

virtual std::shared_ptr<yarpl::flowable::Flowable<rsocket::Payload>>

handleResponderResumeStream(

std::string streamToken,

size_t publisherAllowance);

// This method will be called for each REQUEST_STREAM for which the

// application acted as a requester. The default action would be to return a

// Subscriber which cancels the stream immediately after getting subscribed.

// The second parameter is the allowance which the application requested

// before cold-start and hasn't been fulfilled yet.

virtual std::shared_ptr<yarpl::flowable::Subscriber<rsocket::Payload>>

handleRequesterResumeStream(

std::string streamToken,

size_t consumerAllowance);

};

} // namespace rsocket