75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
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// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "rsocket/Payload.h"
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#include "rsocket/statemachine/ConsumerBase.h"
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#include "rsocket/statemachine/PublisherBase.h"
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#include "yarpl/flowable/Subscriber.h"
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namespace rsocket {
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/// Implementation of stream stateMachine that represents a Channel requester.
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class ChannelRequester : public ConsumerBase,
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public PublisherBase,
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public yarpl::flowable::Subscriber<Payload> {
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public:
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ChannelRequester(
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Payload request,
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std::shared_ptr<StreamsWriter> writer,
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StreamId streamId)
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: ConsumerBase(std::move(writer), streamId),
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PublisherBase(0 /*initialRequestN*/),
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request_(std::move(request)),
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hasInitialRequest_(true) {}
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ChannelRequester(std::shared_ptr<StreamsWriter> writer, StreamId streamId)
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: ConsumerBase(std::move(writer), streamId),
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PublisherBase(1 /*initialRequestN*/) {}
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void onSubscribe(std::shared_ptr<yarpl::flowable::Subscription>) override;
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void onNext(Payload) override;
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void onComplete() override;
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void onError(folly::exception_wrapper) override;
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void request(int64_t) override;
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void cancel() override;
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void handlePayload(
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Payload&& payload,
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bool flagsComplete,
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bool flagsNext,
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bool flagsFollows) override;
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void handleRequestN(uint32_t) override;
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void handleError(folly::exception_wrapper) override;
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void handleCancel() override;
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void endStream(StreamCompletionSignal) override;
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private:
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void initStream(Payload&&);
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void tryCompleteChannel();
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/// An allowance accumulated before the stream is initialised. Remaining part
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/// of the allowance is forwarded to the ConsumerBase.
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Allowance initialResponseAllowance_;
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Payload request_;
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bool requested_{false};
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bool hasInitialRequest_{false};
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};
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} // namespace rsocket
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